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PROGRAMUL OPERAŢIONAL SECTORIAL CREŞTEREA COMPETITIVITĂŢII ECONOMICE AXA PRIORITARĂ 2 – COMPETITIVITATE PRIN CDI Operaţiunea 2.1.2: "Proiecte CD de înalt nivel ştiinţific cu participarea unor specialişti din străinătate" Titlul / Acronimul proiectului: Facilitate pentru diagnoza de fascicul laser si caracterizare / certificare ISO a comportarii componentelor optice / materialelor sub actiunea fasciculelor laser de mare putere / ISOTEST. RAPORT DE CERCETARE Nr. 7 / 20.03.2012 Perioada de raportare: 16.12.2011 15.03.2012
Transcript
Page 1: RAPORT DE CERCETARE Nr. 7 / 20.03 - ssll.inflpr.rossll.inflpr.ro/ISOTEST/Raportari/R7.pdfStare proba (centrata/ necentrata) Calibrare . Activitatea 2.1. Montajul si testarea subsistemelor

PROGRAMUL OPERAŢIONAL SECTORIAL CREŞTEREA COMPETITIVITĂŢII ECONOMICE

AXA PRIORITARĂ 2 – COMPETITIVITATE PRIN CDI

Operaţiunea 2.1.2: "Proiecte CD de înalt nivel ştiinţific cu participarea unor specialişti din

străinătate"

Titlul / Acronimul proiectului: Facilitate pentru diagnoza de fascicul laser si caracterizare /

certificare ISO a comportarii componentelor optice / materialelor sub actiunea fasciculelor laser de

mare putere / ISOTEST.

RAPORT DE CERCETARE Nr. 7 / 20.03.2012

Perioada de raportare: 16.12.2011 – 15.03.2012

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INFLPR

Sectia Laseri

Raport de Cercetare nr. 7 / 20.03.2012

In cadrul activitatilor de dezvoltare experimentala si cercetare industriala prevazute pentru a

7-a perioada de raportare (16.12.2011 – 15.03.2012) au fost obtinute urmatoarele rezultate:

Activitatea 1.5. Proiectarea si realizarea sistemului software-hardware de operare automata si de

achizitie / procesare semnale – Realizat partial.

Au fost efectuate teste preliminare de functionare a sistemului software-hardware privind

algoritmul de operare automata al procedurii ISO S-on-1 de masurare a pragului de distrugere in

camp laser (PDCL): realizarea hartii siturilor de test (numarul si distributia siturilor pe proba de

test), inregistrarea energiei laser si a numarului de pulsuri care au distrus situl testat, fitarea

parametrica a datelor experimentale, calculul erorii de fitare, calculul energiei laser de test pentru

situl urmator pe baza evaluarii setului de date experimentale masurat anterior, reprezentarea grafica

a caracteristicilor de probabilitate de distrugere. In fig. 1 este aratata interfata grafica a programului

de operare automata S-on-1.

A fost testat deasemenea protocolul de comunicare cu unitatea DSP privind interogarea

perifericelor si trimitere comenzi, calibrarea atenuatorului variabil de fascicul si centrarea probei in

fasciculul laser de test. Fereastra de comunicare a programului de operare cu unitatea DSP este

aratata in fig. 2.

Testele efectuate au evidentiat o functionare corecta a algoritmului de operare automata,

conform Caietului de Sarcini 01-10.03.2011. Ca urmare, a fost receptionata etapa a II-a a

contractului cu firma Delisoft (care realizeaza programul software de operare S-on-1), intitulata

“Dezvoltarea aplicatiei pentru testare preliminara, dezvoltarea aplicatiei pentru testare automata,

dezvoltarea interfetei grafice”.

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Fig.1. Interfata grafica a aplicatiei software cu harta probei, caracteristicile de probabilitate de distrugere (caracteristica afisata este P500, cea cu

eroarea cea mai mare de fitare), baza de date cu puncte discrete de probabilitate, erorile de fitare pentru caracteristicile de probabilitate, energia de

test pentru situl urmator.

Fitare liniara

Situri distruse

Calculul probabilitatilor

pe nivele de energie

Erori de fitare

Harta situri cu legenda

Fereastra introducere

date in operare manuala

Energia

urmatoare

pentru

interogare sit

Schimbare tabel calcul

probabilitati cu tabel

baza de date puncte

Tab-uri pentru selectarea

graficelor de probabilitate

Butoane operare: Test nou/Salvare rezultate/Interogare urmatorul sit/ etc

Coordonatele urmatorului sit de explorat

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4

Fig.2. Fereastra de comunicare cu unitatea DSP pentru interogare stare periferice si trimitere comenzi,

calibrarea atenuatorului variabil si centraj proba

Port

comunicare

cu DSP

Stare

motoare

Tip proba

Stare proba

(centrata/

necentrata)

Calibrare

atenuator

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Activitatea 2.1. Montajul si testarea subsistemelor instalatiei automate. – Realizat partial.

In ziua de 17.12.2011, Compania Quantel ( Franta), producator al laserului Brilliant B-IR-10-

SLM utilizat ca sursa laser de test in pulsuri de nanosecunde pentru procedura ISO S-on-1, a efectuat o

verificare si un reglaj al profilului temporal al pulsurilor laser generate in regim de emisie pe un singur

mod longitudinal (SLM), conform obligatiilor asumate in contractul de furnizare pe perioada de

garantie.

Interventia a fost necesara deoarece, dupa aproape un an de functionare, emisia laser prezenta o

usoara instabilitate care afecta frontul posterior al profilul temporal al pulsului laser, asa cum se poate

vedea in figura 3. Profilul temporal de puls a fost ameliorat prin stabilizarea emisiei laser in regim

SLM, asa cum se arata in fig. 4.

(a) (b)

Fig. 3. Profilul temporal de puls inainte de interventie (emisie laser pe 1 – 2 moduri longitudinale).

(a) Profil temporal mediat pe 100 pulsuri; (b) Jitter temporal (172 pulsuri suprapuse)

(a) (b)

Fig. 4. Profilul temporal de puls dupa stabilizarea emisiei laser pe un singur mod longitudinal.

(a) Profil temporal mediat pe 100 pulsuri; (b) Jitter temporal (172 pulsuri suprapuse)

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Activitatea 2.2. Teste preliminare de functionare sistem software-hardware. Implementarea

procedurilor ISO (diagnoza de fascicul, masurare PDCL si fiabilitate in camp laser) pe sistemul

software-hardware.– Realizat partial.

A fost monitorizata secventa automata de reglaj a energiei laser de test pentru situl urmator

(corespondenta intre energia laser de test furnizata efectiv de atenuatorul variabil si valorea nominala a

energiei calculata si setata de programul software al procedurii S-on-1). Aceste teste au relevat ca, in

regim de functionare indelungata, se manifesta aleatoriu o scadere a preciziei in setarea enrgiei laser de

test. Aceasta problema a fost rezolvata printr-o serie de modificari aduse structurii software-hardware a

unitatii DSP. Acuratetea pozitionarii atenuatorului variabil pe valoarea setata a energiei laser este

ilustrata in tabelul 1, unde este aratata o comparatie intre energia pe puls setata de program si energia

furnizata efectiv de atenuatorul variabil, masurata cu detectorul piroelectric J-25-MT-10kHz

(Coherent, Inc.). A rezultat o eroare relativa medie de 0,5 % a energei laser de test masurata in raport

cu valoarea nominala setata de program, fapt care atesta o functionare corecta a atenuatorului variabil.

Erori relative de peste 1 % au fost masurate numai la energii de test scazute, aflate la limita gamei de

energie laser utilizata in procedura de masurare.

Tabelul 1.

Energie setata

Qset(mJ)

Energie masurata

Qmas(mJ)

(Qset - Qmas)/Qset

%

1 100 100.50 0.5

2 95 95.58 0.6

3 90 90.32 0.4

4 85 85.40 0.5

5 80 80.25 0.3

6 75 75.29 0.4

7 70 70.09 0.1

8 65 65.01 0.0

9 60 60.34 0.6

10 55 55.18 0.3

11 50 50.05 0.1

12 45 45.22 0.5

13 40 40.15 0.4

14 35 34.74 0.7

15 30 29.99 0.0

16 25 25.04 0.2

17 20 19.92 0.4

18 15 14.95 0.3

19 10 9.96 0.4

20 5 4.96 0.9

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21 2 1.97 1.6

22 1 0.97 2.7

Au fost initiate teste preliminare de implementare a procedurilor de diagnoza de fascicul,

conform standardului ISO 11146-1:2005. Fasciculele laser de test au fost furnizate de un laser in

pulsuri de sute de picosecunde pompat cu diode laser si de un laser He-Ne in unda continua 1105P

(Uniphase, SUA). Au fost masurati urmatorii parametri spatiali de fascicul: dimensiunile transversale

de fascicul (in momente de ordinul doi, conform definitiei ISO), divergenta unghiulara si factorul de

propagare M2. Testele urmaresc reducerea incertitudinii rezultatelor masurarilor prin ajustarea si

definitivarea parametrilor setup-ului experimental. Rezultatele testelor sunt prezentate pe larg in

Anexele 1 si 2 ale prezentului raport.

Au fost realizate teste preliminare privind implementarea unei metode de masurare a duratei

efective a pulsurilor laser de femtosecunde, conform definitiei data de standardul ISO 21254-1:2011.

Testele au fost efectuate pe sistemul laser in pulsuri de femtosecunde CPA-2101 (Clark-MXR, Inc.,

SUA), care este utilizat ca sursa laser de test in setup-ul experimental pentru procedura automata

S-on-1 de masurare a PDCL cu pulsuri de femtosecunde.

Durata efectiva a pulsurilor de femtosecunde este obtinuta prin procesarea datelor

experimentale furnizate de dispozitivul Grenouille model 8-50-USB. In figura 5 este aratata amprenta

(trasa) inregistrata de camera dispozitivului, amprenta care contine informatia privind caracteristicile

temporale si spectrale ale pulsului laser masurat. Din aceasta amprenta, algoritmul Grenouille

reconstiue profilul temporal de intensitate (fig. 6a) si profilul spectral de intensitate (fig. 6b) al

pulsurilor laser de femtosecunde generate de sistemul CPA-2101 la lungimea de unda centrala de 775

nm.

Conform ISO 21254-1:2011, durata efectiva a pulsurilor laser, τeff , este definita ca raportul

intre energia totala, Q, si puterea instantanee de varf, Ppk a pulsului laser

pkpk

effP

dttP

P

Q

0

)(

(1)

unde P(t) este puterea optica instantanee a pulsului laser.

Amprenta Grenouille a fost masurata cu o rezolutie de 16 kpixeli, eroarea de calcul a

algoritmului de reconstituire fiind de 1.4%. Durata profilului temporal de intensitate la jumatate din

amplitudine a fost de 276 fs, cu o largime a benzii spectrale de 6.5 nm.

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(a) (b)

Fig. 5. Amprenta Grenouille a pulsurilor de femtosecunde generate

de sistemul laser CPA2101.

(a)Amprenta masurata; (b) Amprenta reconstituita de algoritmul Grenouille (asemanarea cu trasa

masurata atesta o reconstituire corecta a pulsului laser).

(a) (b)

Fig. 6. Reconstituirea caracteristicilor temporale si spectrale ale pulsurilor laser ultrascurte din

amprenta Grenouille. (a) Profilul temporal de intensitate (albastru) si faza temporala (verde).

(b) Profilul spectral de intensitate (rosu) si faza spectrala (galben)

Datele masurate de dispozitiv au fost salvate si introduse intr-un algoritm numeric de calcul.

Prin procesarea si integrarea profilului temporal de intensitate furnizat de Grenouille a fost dedusa

energia totala si puterea de varf a pulsului laser incident pe camera Grenouille. In final, cu ajutorul

ecuatiei (1), a fost calculata durata efectiva a pulsurilor laser de test, τeff = 285 fs. Incertitudinea

rezultatului masurarii a fost evaluata la 3 %.

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Activitatea 2.3. Teste preliminare si finale pentru optimizarea functionarii instalatiei automate

privind derularea automata a procedurilor de masurare, detectarea PDCL, achizitia si procesarea

datelor furnizate de senzorii de masura.

Au fost initiate testele preliminare de functionare integrata a sistemului de operare automata a

procedurii ISO „S-on-1” de masurare a pragului de distrugere, pe componente optice furnizate de

producatorul SC Opticoat SRL (recent, noul nume al companiei a devenit Ophir Optics SRL, ca

urmare a integrarii in concernul Newport-Ophir, Israel). Testele urmaresc derularea corespunzatoare

a secventelor procedurii automate de masurare, reproductibilitatea parametrilor de proces, estimarea

incertitudinii globale in evaluarea pragului de distrugere laser in conditii de iradiere cu pulsuri

multiple. Pe baza rezultatelor obtinute in cadrul acestor teste, vor fi efectuate modificari

corespunzatoate ale sistemului software-hardware si ale setup-ului experimental, in vederea cresterii

fiabilitatii instalatiei automate S-on-1 si a reducerii incertitudinii de masurare a PDCL.

Testele au fost realizate pe doua tipuri de oglinzi laser pentru infrarosu apropiat: GR1978Q,

reflectivitate 88% @ 1540 nm si GR1975/76 - SJ6035 HR @1540 nm. Programul de operare in

complet cu unitatea DSP a controlat numarul si distributia siturilor pe proba de test, pozitionarea

siturilor in fasciculul laser de test, atenuatorul variabil, detectia in timp real a distrugerii sitului

interogat urmata de inchiderea imediata a obturatorului de fascicul, inregistrarea energiei laser de test

si a numarului de pulsuri care au distrus situl. Pe baza setului de date masurat anterior, programul

calculeaza si seteaza energia laser de test pentru situl urmator.

Dupa o secventa preliminara de interogare a 30-40 situri realizata de operator (pentru a forma o

baza initiala de date), programul ridica 9 caracteristici de probabilitate de distrugere pentru 1; 2; 5; 10;

20; 50; 100; 200; 500 pulsuri aplicate pe sit. Criteriul utilizat de program in determinarea acestor

caracteristici consta in reducerea erorii de fitare parametrica a curbelor de probabilitate de distrugere

prin adaugarea coresunzatoare de noi date experimentale.

Dupa finalizarea secventei de interogare a siturilor, programul calculeaza caracteristica de

distrugere a probei (densitatea de energie laser la pragul de distrugere functie de numarul de pulsuri

laser aplicate pe sit) prin procesarea datelor furnizate de cele 9 curbe de probabilitate determinate

experimental in secventa de interogare. In final, programul extrapoleaza caracteristica de distrugere

pentru un numar mare de pulsuri si completeaza raportul de test.

Rezultatele detaliate ale acestor teste preliminare sunt prezentate in Anexele 3 si 4 ale

prezentului raport. Incertitudinea absoluta medie in masurarea PDCL a fost evaluata la ~ 27 %,

rezultat care este in concordanta cu experienta internationala acumulata in acest domeniu, care indica o

limita de ~ 25 % a incertitudinii absolute in masurarea PDCL prin procedura S-on-1. [1]

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Concluzii

Apreciem ca au fost indeplinite activitatile prevazute pentru pentru a saptea perioada de

raportare: 16.12.2011 – 15.03.2012 (activitati de dezvoltare experimentala si de cercetare industriala).

Pana in prezent nu sunt de semnalat factori care ar putea intarzia derularea planificata a activitatilor

proiectului.

Referinte

1. C. J. Stolz, D. Ristau, M. Turowski, H. Blaschke, Thin Film Femtosecond Laser Damage

Competition, Boulder Damage Symposium, Boulder, CO, United States, 21-23 September 2009

(November 20, 2009). https://e-reports-ext.llnl.gov/pdf/382702.pdf

Director stiintific,

Dr. Aurel Stratan

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ANEXA 1

Test Report No. 2/ 24.02.2012

Evaluation of laser beam widths, divergence angles and beam propagation ratios according to standard ISO 11146-1:2005

a) General information

1)Test has been performed in accordance with ISO 11146-1:2004; YES

2) Date of test: 24.02.2012

3)Name and address of test organization:

Solid State Lasers Laboratory: http://ssll.inflpr.ro

National Institute for Lasers, Plasma and Radiation Physics

409, Atomistilor Str. PO Box MG 36, 077125 Magurele, Bucharest, Romania

4) Name of individual performing the test: Alexandru Zorila and Laurentiu RUSEN

b) Information concerning the tested laser

1) Laser type: Sub-nanosecond diode pumped Nd:YAG laser

2) Manufacturer: INFLPR

3) Manufacturer’s model designation:

4) Serial number:

c) Test conditions

1) Laser wavelength(s) at which tested: 1064 nm

2) Operating mode (cw or pulsed): pulsed

3) Laser parameter settings

i) Output pulse energy: 10 μJ

ii) Pulse repetition rate: 1kHz

5) Polarization: linear

6) Environmental conditions: clean filtered air, controlled temperature 22 oC 1

oC.

d) Information concerning testing and evaluation

1) Evaluation method used:

i) Second order moment

2) Test equipment:

i) Camera Spiricon USB SP620U

4) Beam forming optics and attenuating method:

i) Type of attenuator, ND

iii) Type of focusing element; Lens f = 406.3 mm at 1064 nm wavelength

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e) Test Results

1) Beam waist widths and Rayleigh length

Location z01 = 3600 mm from the front principal plane of the focusing lens.

Mean value (mm) Standard deviation (%)

Beam waist diameter dσ01 1.89 1.43 Beam width dσ01x 1.76 1.44 Beam width dσ01y 2.08 1.44 Rayleigh length zR1 1250 2.02 Rayleigh length zR1x 1290 2.03 Rayleigh length zR1y 1260 2.02

2) Beam divergence angles (in accordance with Clause 8)

Focusing element used: Convergent Lens

Focal length: f = 406.3 mm @ 1064 nm

Mean value (mrad) Standard deviation (%)

Beam divergence angle Θσ 1.51 1.43 Beam divergence angle Θσ1x 1.37 1.43 Beam divergence angle Θσ1y 1.66 1.43

3) Beam propagation parameters derived from hyperbolic fit (in accordance with Clause 9)

Beam waist locations z02 measured from the rear principal plane of the focusing lens

Table 1. Beam parameters of the focused laser beam

Value Standard deviation (%)

Beam waist location z02 451 mm 0.11 Beam waist location z02x 451 mm 0.14 Beam waist location z02y 451 mm 0.13 Beam waist diameter dσ02 0.22 mm 0.12 Beam waist width dσ02x 0.21 mm 0.15 Beam waist width dσ02y 0.25 mm 0.14 Rayleigh length zR2 17.6 mm 0.14 Rayleigh length zR2x 18.5 mm 0.17 Rayleigh length zR2y 17.5 mm 0.16 Beam divergence angle Θσ 12.8 mrad 0.06 Beam divergence angle Θσ2x 11.4 mrad 0.08 Beam divergence angle Θσ2y 14.0 mrad 0.06 Beam propagation ratio M

2 2.11 0.11 Beam propagation ratio M

2x 1.78 0.13

Beam propagation ratio M2

y 2.55 0.12

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375 400 425 450 475 500 525

0,0

0,2

0,4

0,6

0,8

1,0

1,2

Dmean

Fit of Dmean

Dm

ea

n (

mm

)

z (mm)

Equation y = sqrt(A + B*x + C*x*x)

Value Standard Error

Dmean A 24,52154 0,05013

Dmean B -0,11737 3,76318E-4

Dmean C 1,40883E- 5,82259E-7

Fig.1. Hyperbolic fit to the measured beam widths along the propagation distance z.

Fig. 2 Spatial beam profile measured at the beam waist of the focused beam.

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ANEXA 2

Test Report No. 3/ 09.03.2012

Evaluation of laser beam widths, divergence angles and beam propagation ratios according to standard ISO 11146-1:2005

a) General information

1) Test has been performed in accordance with ISO 11146-1:2005; YES

2) Date of test: 09.03.2012

3) Name and address of test organization:

Solid State Lasers Laboratory: http://ssll.inflpr.ro

National Institute for Lasers, Plasma and Radiation Physics

409, Atomistilor Str. PO Box MG 36, 077125 Magurele, Bucharest, Romania

4) Name of individual performing the test: Alexandru Zorila and Laurentiu RUSEN

b) Information concerning the tested laser

1) Laser type: He-Ne laser

2) Manufacturer: Uniphase, USA

3) Manufacturer’s model designation: 1105P

4) Serial number: 159768

c) Test conditions

1) Laser wavelength(s) at which tested: 633 nm

2) Operating mode (cw or pulsed): cw

3) Laser parameter settings

i) Output power: 5 mW

5) Polarization: random polarisation

6) Environmental conditions: clean filtered air, controlled temperature 22 oC 1

oC.

d) Information concerning testing and evaluation

1) Evaluation method used:

i) Second order moment

2) Test equipment:

i) Camera Spiricon USB SP620U

4) Beam forming optics and attenuating method:

i) Type of attenuator: ND;

iii) Type of focusing element: Lens f = 400 mm at 633 nm wavelength

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e) Test Results

1) Beam waist widths and Rayleigh length

Location z01 = 1570 mm from the front principal plane of the focusing lens.

Mean value

mm

Standard deviation

%

Beam waist diameter dσ01 0.99 6.79 Beam width dσ01x 1.01 5.94 Beam width dσ01y 0.99 5.19 Rayleigh length zR1 1096 7.86 Rayleigh length zR1x 1091 6.93 Rayleigh length zR1y 1053 6.07

2) Beam divergence angles (in accordance with Clause 8)

Focusing element used: Convergent Lens

Focal length: f = 400 mm @ 633 nm

Mean value

mrad

Standard deviation

%

Beam divergence angle Θσ 0.90 5.82 Beam divergence angle Θσ1x 0.92 5.11 Beam divergence angle Θσ1y 0.94 4.60

3) Beam propagation parameters derived from hyperbolic fit (in accordance with Clause 9)

Beam waist locations z02 measured from the rear principal plane of the focusing lens

Table 1. Beam parameters of the focused laser beam

Mean value

Standard deviation

%

Beam waist location z02 473 mm 3.42 Beam waist location z02x 473 mm 2.98 Beam waist location z02y 476 mm 2.60 Beam waist diameter dσ02 0.25 mm 3.85 Beam waist width dσ02x 0.25 mm 3.35 Beam waist width dσ02y 0.25 mm 2.91 Azimuth angle ϕ Rayleigh length zR2 68.4 mm 4.19 Rayleigh length zR2x 69.1 mm 3.64 Rayleigh length zR2y 68.3 mm 3.12 Beam divergence angle Θσ 3.6 mrad 1.63 Beam divergence angle Θσ2x 3.7 mrad 1.42 Beam divergence angle Θσ2y 3.7 mrad 1.63 Beam propagation ratio M

2 1.11 3.49 Beam propagation ratio M

2x 1.16 3.03

Beam propagation ratio M2

y 1.15 2.64

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400 450 500 550 600 650 700 750

0.0

0.2

0.4

0.6

0.8

1.0

Dmean

Fit of Dmean

Dm

ea

n (

mm

)

z (mm)

Equation y = sqrt(A + B*x + C*x*x)

Value Standard Erro

Dmean A 2.99285 0.07492

Dmean B -0.0124 3.13442E-4

Dmean C 1.31128E-5 3.02869E-7

Fig.1. Hyperbolic fit to the measured beam widths along the propagation distance z.

Fig. 2 Spatial beam profile measured at the beam waist of the focused beam.

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ANEXA 3

National Institute for Lasers, Plasma and Radiation Physics (NILPRP/INFLPR)

Solid State Lasers Laboratory ISOTEST project

Laser-induced damage threshold (LIDT) by S-on-1 test in accordance to ISO 21254 - 1, 2, 3, 4

Date: 3/13/2012 Name: Alexandru Zorila, Laurentiu Rusen

Specimen: Type of Specimen: Laser Mirror GR1975/76 - SJ6035 HR @1540 nm;

Manufacturer: SC Ophir Optics SRL, Bucharest, Romania Storage, Cleaning: No special precautions

Test equipment: Laser source

Type: Q-switched, single longitudinal mode Manufacturer: Quantel (France) Model: Brilliant B 10 SLM

Energy meter Manufacturer: Coherent, Inc.

Model: J-50MB-YAG pyroelectric detector Calibration date: 8/1/2011

Energy measurement Pulse energy online monitored with type J-25MT-10kHz pyroelectric detector (Coherent, Inc.)

and calibrated with J-50MB-YAG pyroelectric detector (Coherent, Inc.).

Laser parameters: Wavelength: 1064 nm Operating mode: pulsed Output energy: adjustable, up to 450 mJ Pulse repetition frequency: 10 Hz Polarization state: linear, totally polarized, horizontal

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Measurement specifications: Effective beam area: 3.46 x 10-4 cm2

Effective beam diameter: 0.210 mm Effective pulse duration: 6.3 ns Spatial beam profile: near-gaussian Angle of incidence: 1° Number of sites per specimen: 320 Number of shots per site: 500 Arrangement of test sites: near-circular close packed Minimum distance between sites: 1 mm Number of specimens tested: 1 Total number of sites for the test: 320 Damage detection: online scatter measurement Storage of the specimen: manufacturer box

Enviromental conditions: Cleaning: duster 1671-10S, aerosol

Mounting of sample: commercial kinematic mount Test environment: clean filtered air, 24 °C ± 1 °C, 30 % humidity

Fig. 1. Spatial laser beam profile in the target plane Fig. 2. Temporal profile of the laser pulse

Error budget: a) random variations: Pulse-energy stability (rms): ±1 %

Spatial pulse profile stability (rms): ±4 % Temporal pulse profile stability (rms): ±5 %

b) systematic variations: Energy monitor calibration: ±2 %

Energy detector calibration: ±2 %

c) total errors: Estimated LIDT standard uncertainty: ±24 %

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Test Results:

Fig. 3. Damage probability plots for two different LIDT levels. PN(Q), damage probability values for a defined number N of pulses and a specified energy Q;

Fig. 4. Characteristic damage curve of the sample. H0(N), energy density at 0 % LIDT for a specified N.

H50(N), energy density at 50 % LIDT for a specified N.

Fig. 5. Extrapolated S-on-1 damage threshold as function of N number of pulses. E, pulse power density

1 10 1000

5

10

15

20

25

30

N (number of pulses)

En

erg

y d

en

sity H

[J/c

m2]

H0(N)

H0(N) fit

Modelextrapolare (User)

Equation y = Hd + (H1 - Hd)/(1+ (log10(x)/delta))

Reduced Chi-Sqr

0,66768

Adj. R-Square 0,95146

Value Standard Error

H(P0)

H1 21,85428 0,8166

delta 0,16627 0,06298

Hd 9,8072 0,61774

1 10 100 1000

0

5

10

15

20

25

30

35

40

H50(N)

H50(N) linear fit

H(P

50

) (J

/cm

2)

N (number of pulses)

Modelextrapolare (User)

Equation y = Hd + (H1 - Hd)/(1+ (log10(x)/delta))

Reduced Chi-Sqr

1,3169

Adj. R-Square 0,96899

Value Standard Error

H(P50)

H1 32,33462 1,14424

delta 0,27576 0,07386

Hd 10,27089 1,06222

10-1

101

103

105

107

109

8

12

16

20

24

N (number of pulses)

H0(N)

H0(N) extrapolation

En

erg

y d

en

sity H

[J/c

m2]

H(108)= 9.13 J/cm

2 @ 6.3 ns, 10 Hz

E(108)= 1.45 GW/cm

2

10-1

101

103

105

107

109

10

20

30

H50(N)

H50(N) extrapolation

En

erg

y d

en

sity H

[J/c

m2]

N (number of pulses)

H(108)= 9.44 J/cm

2 @ 6.3 ns, 10 Hz

E(108)= 1.5 GW/cm

2

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Fig. 6. Normarski micrograph of a damaged site (energy density 22 J/cm2, damage after 5 pulses)

Extrapolated 0 % LIDT for N = 108 pulses: energy density 9.13 J/cm2, power density 1.45 GW/cm2 @ 6.3 ns pulse duration, equivalent to 810 MW/cm2 @ 20 ns pulse duration

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21

ANEXA 4

National Institute for Lasers, Plasma and Radiation Physics (NILPRP/INFLPR)

Solid State Lasers Laboratory ISOTEST project

Laser-induced damage threshold (LIDT) by S-on-1 test in accordance to ISO 21254 - 1, 2, 3, 4

Date: 09.03.2012 Name: Alexandru Zorila, Laurentiu Rusen

Specimen: Type of Specimen: Laser Mirror GR1978Q reflectivity 88% @ 1540 nm

Manufacturer: SC Ophir Optics SRL, Bucharest, Romania Storage, Cleaning: No special precautions

Test equipment: Laser source

Type: Q-switched, single longitudinal mode Manufacturer: Quantel (France) Model: Brilliant B 10 SLM

Energy meter Manufacturer: Coherent, Inc.

Model: J-50MB-YAG pyroelectric detector Calibration date: 8/1/2011

Energy measurement Pulse energy online monitored with type J-25MT-10kHz pyroelectric detector (Coherent, Inc.)

and calibrated with J-50MB-YAG pyroelectric detector (Coherent, Inc.).

Laser parameters: Wavelength: 1064 nm Operating mode: pulsed Output energy: adjustable, up to 450 mJ Pulse repetition frequency: 10 Hz Polarization state: linear, totally polarized, horizontal

Measurement specifications: Effective beam area: 3.46 x 10-4 cm2

Effective beam diameter: 0.210 mm

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Effective pulse duration: 6.3 ns Spatial beam profile: near-gaussian Angle of incidence: 1° Number of sites per specimen: 320 Number of shots per site: 500 Arrangement of test sites: near-circular close packed Minimum distance between sites: 1 mm Number of specimens tested: 1 Total number of sites for the test: 320 Damage detection: online scatter measurement Storage of the specimen: manufacturer box

Enviromental conditions: Cleaning: duster 1671-10S, aerosol

Mounting of sample: commercial kinematic mount Test environment: clean filtered air, 24 °C ± 1 °C, 30 % humidity

Fig. 1. Spatial laser beam profile in the target plane Fig. 2. Temporal profile of the laser pulse

Error budget: a) random variations: Pulse-energy stability (rms): ±1 %

Spatial pulse profile stability (rms): ±4 % Temporal pulse profile stability (rms): ±5 %

b) systematic variations: Energy monitor calibration: ±2 %

Energy detector calibration: ±2 %

c) total errors: Estimated LIDT standard uncertainty: ±30 %

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Test Results:

Fig. 3. Damage probability plots for two different LIDT levels. PN(Q), damage probability values for a defined number N of pulses and a specified energy Q;

Fig. 4. Characteristic damage curve of the sample. H0(N), energy density at 0 % LIDT for a specified N. H50(N), energy density at 50 % LIDT for a specified N.

Fig. 5. Extrapolated S-on-1 damage threshold as function of N number of pulses. E, pulse power density

1 10 1000

5

10

15

20

N (number of pulses)

En

erg

y d

en

sity H

[J/c

m2]

H0(N)

H0(N) fitModelextrapolare (User)

Equation y = Hd + (H1 - Hd)/(1+ (log10(x)/delta))

Value Standard Error

H(P0)

H1 16,72624 0,92707

delta 0,10479 0,06097

Hd 6,11984 0,6204

1 10 100 1000

0

5

10

15

20

25

H50(N)

H50(N) linear fit

H(P

50

) (J

/cm

2)

N (number of pulses)

Modelextrapolare (User)

Equation y = Hd + (H1 - Hd)/(1+ (log10(x)/delta))

Value Standard Error

H(P50)

H1 20,06748 0,56539

delta 0,0455 0,02497

Hd 8,57167 0,33468

10-1

101

103

105

107

109

0

10

20

N (number of pulses)

H0(N)

H0(N) extrapolation

En

erg

y d

en

sity H

[J/c

m2]

H(108)= 4.77 J/cm

2 @ 6.3 ns, 10 Hz

E(108)= 750 MW/cm

2

10-1

101

103

105

107

109

0

10

20

H50(N)

H50(N) extrapolation

En

erg

y d

en

sity H

[J/c

m2]

N (number of pulses)

H(108)= 7.66 J/cm

2 @ 6.3 ns, 10 Hz

E(108)= 1.2 GW/cm

2

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Fig. 6. Normarski micrograph of a damaged site (energy density 10 J/cm2, damage after 2 pulses)

Extrapolated 0 % LIDT for N = 108 pulses: energy density 4.77 J/cm2, power density 750 MW/cm2 @ 6.3 ns pulse duration, equivalent to 420 MW/cm2 @ 20 ns pulse duration


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