Beam-size effects on the measurement of sub-picosecond intrinsic laser induced damage threshold of dielectric oxide coatings

Stehlik, Marek; Wagner, Frank; Zideluns, Janis; Lemarchand, Fabien; Lumeau, Julien; Gallais, Laurent

doi:10.1364/ao.433935

Cited by 5 publications

(3 citation statements)

References 49 publications

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“…The test station used for LIDT tests is described in Ref. 43 detailing the description of test procedures and metrology methods. For the results reported here in this study, the pulses of nearly Gaussian spatial profile and ∼ 500 fs pulse duration at ∼ 1030 nm wavelength were incident at a repetition rate of 10 Hz.…”

Section: Test Stationmentioning

confidence: 99%

Sub-ps 1030 nm laser-induced damage threshold evaluation of pulsed-laser deposited sesquioxides and magnetron-sputtered metal oxide optical coatings

Stehlik

Govindassamy

Zideluns

et al. 2022

Laser-Induced Damage in Optical Materials 2022

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Crystalline sesquioxide films (Sc 2 O 3 , Y 2 O 3 , Lu 2 O 3 ) produced by pulsed-laser deposition were examined for laser damage resistance with pulses of 500 fs duration, at a wavelength of 1030 nm and at a 10 Hz repetition rate. Comparable tests were performed with amorphous magnetron-sputtered thin films (SiO 2 , HfO 2 , Nb 2 O 5 ). We found the laser-induced damage thresholds of the sesquioxides are close to those of HfO 2 in the multi-pulse test regime. The results are the basis for designs of damage resistant reflective components used in ultrashort-pulse lasers.

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Section: Test Stationmentioning

confidence: 99%

Sub-ps 1030 nm laser-induced damage threshold evaluation of pulsed-laser deposited sesquioxides and magnetron-sputtered metal oxide optical coatings

Stehlik

Govindassamy

Zideluns

et al. 2022

Laser-Induced Damage in Optical Materials 2022

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“…The process of interaction of radiation with matter during the optical breakdown is very complicated and depends on many factors. [4][5][6] On the one hand, there are the parameters of the interacting radiation, such as the wavelength of the radiation, the shape and length of the interacting pulse, the energy or power density, its homogeneity and spatial distribution, but also the polarization, repetition frequency of the pulses, mean power, the size of the laser beam trace, the angle of incidence, etc. Next are the environment parameters.…”

Section: Introductionmentioning

confidence: 99%

Nd:YAG/Cr:YAG microchip-based system for laser-induced damage threshold measurement

Šulc¹,

Němec²,

Vyhĺıdal³

et al. 2023

Solid State Lasers XXXII: Technology and Devices

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A compact system for measuring laser-induced damage threshold (LIDT) was developed. As a source of linearly polarized 1064 nm testing radiation, the special Q-switched microchip laser was used. This laser was based on monolith crystal composed of Nd:YAG active laser part (0.9 at.% Nd/Y, 20 mm long, pump mirror deposited) and Cr:YAG saturable absorber (initial transmission 60 %, 1.8 mm long, output coupler with reflection 60 % @ 1064 nm deposited). The laser generates 3.9 ns long pulses with an energy of 0.42 mJ and repetition rate of 50 Hz. The probe beam spatial structure has Gaussian profile (M2 = 1.1). At the focal point of the focusing aspheric lens, it is possible to achieve a peak energy density of up to 900 J/cm2 (the beam radius at the focal spot was 5.6 μm). The LIDT measurement uses computer-controlled attenuator and sample 3D positioner. To calibrate the spatial parameters of the probe beam, the knife-edge method is used. The system was designed to test transparent samples with a diameter of up to 25 mm. The measurement takes place automatically. First, the probe beam is characterized. Next, the LIDT estimate is determined, and then the LIDT measurement is performed using the S-on-1 method. The system was tested for silica glass and YAG crystal. The optical part of the device has dimensions of 45 × 60 cm. It is assumed that this system will be used for routine control of LIDT of dielectric layers on laser crystals and mirrors.

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“…Moreover, previous research has generally focused on the influence of the laser parameters on grating damage, such as wavelength [22], pulse width [15], spot [23] and pulse accumulation [24] effects; the differences in laser damage caused by different grating structure characteristics [25] such as the substrate material, the thickness of the film, the stacking of the films, and the manufacturing process; and the damage induced by impurities, defects [26], and contamination [27]. Most of the research methods have been based on experiments, with a lack of reports on the use of simulation models to predict the LIDT of metal gratings irradiated by nanosecond lasers.…”

Section: Introductionmentioning

confidence: 99%

Damage Characteristics of Aluminum-Coated Grating Irradiated by Nanosecond Pulsed Laser

Wang

Zhang

et al. 2022

Coatings

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An aluminum-coated grating (ACG) is a core component of laser systems and spectrometers. Understanding damage to the ACG induced by nanosecond lasers is critical for future high-power laser applications. In this study, we applied finite element simulation and practical experimentation to investigate the characteristics of ACG damage. Based on a coupling model using fluid heat transfer with the level-set method, we simulated the damage caused to an ACG by a 1064 nm nanosecond single pulse laser. The theoretical modeling showed that the ridge and bottom corners of the grid will be preferentially damaged, and the simulated damage threshold will range from 0.63 J/cm2 to 0.95 J/cm2. We performed a one-on-one damage test according to the ISO21254 standard to investigate the failure condition of 1800 l/mm ACGs; the laser-induced damage threshold (LIDT) was 0.63 J/cm2 (1064 nm, 6.5 ns). Microscopy images showed that the damaged area decreased with decreasing laser fluence, and scanning electron microscopy measurements showed that the main damage mechanism was thermodynamic damage, and that damage to the grid occurred first. The results of the experiments and simulations were in good agreement.

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Beam-size effects on the measurement of sub-picosecond intrinsic laser induced damage threshold of dielectric oxide coatings

Cited by 5 publications

References 49 publications

Sub-ps 1030 nm laser-induced damage threshold evaluation of pulsed-laser deposited sesquioxides and magnetron-sputtered metal oxide optical coatings

Sub-ps 1030 nm laser-induced damage threshold evaluation of pulsed-laser deposited sesquioxides and magnetron-sputtered metal oxide optical coatings

Nd:YAG/Cr:YAG microchip-based system for laser-induced damage threshold measurement

Damage Characteristics of Aluminum-Coated Grating Irradiated by Nanosecond Pulsed Laser

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