In situ detection and analysis of laser-induced damage on a 15-m multilayer-dielectric grating compressor for high-energy, petawatt-class laser systems

Qiao, Jie; Schmid, Ansgar W.; Waxer, L. J.; Nguyen, T.; Bunkenburg, J.; Kingsley, C.; Kozlov, A. A.; Weiner, D.

doi:10.1364/oe.18.010423

Cited by 26 publications

(8 citation statements)

References 12 publications

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“…Damage has therefore a strong nonlinear dependence on intensity [14], and no statistical variations in the initiation of the damage process are expected [15]. This deterministic effect pushed people to use 1/1 or S/1 threshold measurements to estimate optics laser damage performances in the sub-picosecond regime [16][17][18][19]. Consequently, the potential role of localized defects was neglected.…”

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confidence: 99%

Laser damage density measurement of optical components in the sub-picosecond regime

et al. 2015

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A rasterscan procedure adapted to the sub-picosecond regime is set to determine laser-induced damage densities as function of fluences. Density measurement is carried out on dielectric high-reflective coatings operating at 1053 nm. Whereas laser-induced damage is usually considered deterministic in this regime, damage events occur on these structures for fluences significantly lower than their intrinsic damage threshold. Scanning electron microscope observations of these "under-threshold" damage sites evidence ejections of defects, embedded in the dielectric stack. This method brings a new viewpoint for the qualification of optical components and their optimization for a high resistance in the sub-picosecond regime.

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Laser damage density measurement of optical components in the sub-picosecond regime

et al. 2015

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“…LIDT is affected by many factors [15,[17][18][19][20][21][22][23], including the confined electric field effect [15], and the mechanical or optical properties of thin films [23] such as refractive index or absorption coefficient. Particularly the process of cleaning the MLDG is important because defects or contamination can induce a confined electric field and thus severely degrade LIDT [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Optical characterizations and thermal analyses of HfO₂/SiO₂ multilayered diffraction gratings for high-power continuous wave laser

Kim

Mun

et al. 2020

J. Phys. Photonics

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Spectral beam combining technique is a simple and straightforward method to obtain a high-power laser beam. The beam combining system typically consists of three parts: fiber laser array, transform optical system and diffraction grating. Performance of the system (diffraction efficiency and laser induced damage threshold) is mainly determined by the diffraction grating. This paper describes a multilayer dielectric diffraction gating with high diffraction efficiency and low laser-induced damage threshold, which can be potentially used to obtain a high-power laser by combing laser beams. The diffraction grating is designed by coupled-wave analysis, and single-beam laser interference lithography is used to fabricate diffraction gratings. To verify the optical and thermal characteristics of the beam, we measure diffraction efficiency and the threshold for laser-induced damage. Finite element method simulation accurately represented temperature distribution in the grating during laser irradiation. This work provides integrated methods that include design of multilayer dielectric gratings, thermal analysis and device characterization using high-power laser.

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“…In optics, a diffraction grating is an optical component with a periodic structure that splits and diffracts light into several beams travelling in different directions, and its cross section usually shows a serrated, sinusoidal, or rectangular array. Gratings have many applications in a variety of spectrometers [1] and, especially, have received great attention for their applications in the selection of laser frequency and bandwidth compression area [2][3][4][5]. As the core component of high-precision spectral instruments [6], gratings are widely used in military, astronomy, alternative energy, biochemical analysis [7], and other fields [8].…”

Section: Introductionmentioning

confidence: 99%

A New Microhardness Testing Method on Grating Films

Jin

Jirigalantu

2020

Mathematical Problems in Engineering

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e manufacturing process of large-area, high-precision gratings is a very complicated and time-consuming process. e hardness testing of grating films is an important step in the entire process. In order to simplify the manufacturing process of gratings, we have proposed a new method for testing microhardness based on tool edge indentation. Also, it unified tool adjustment and microhardness testing steps in the grating manufacturing process. First, a mathematical model of the relationship between tool load and indentation contour length is established. e model parameters were then modified using tool indentation experiments with different loads. When measured with a nanoindenter, the average hardness of the grating film was 447 MPa. e hardness value of the grating film obtained by our proposed method is almost the same as that measured by the nanoindenter, and the maximum deviation is about 2.2% of the average hardness value. e experimental results show that our proposed method can replace the microhardness test method of using a nanoindenter. erefore, the disadvantages of using a nanoindenter to test the hardness of a grating film are avoided, such as the limited sample size, the sensitivity of the indenter to the roughness of the film and the depth of the indentation, and the accuracy of film testing, and the efficiency of grating ruling can be improved.

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In situ detection and analysis of laser-induced damage on a 15-m multilayer-dielectric grating compressor for high-energy, petawatt-class laser systems

Cited by 26 publications

References 12 publications

Laser damage density measurement of optical components in the sub-picosecond regime

Laser damage density measurement of optical components in the sub-picosecond regime

Optical characterizations and thermal analyses of HfO₂/SiO₂ multilayered diffraction gratings for high-power continuous wave laser

A New Microhardness Testing Method on Grating Films

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In situ detection and analysis of laser-induced damage on a 15-m multilayer-dielectric grating compressor for high-energy, petawatt-class laser systems

Cited by 26 publications

References 12 publications

Laser damage density measurement of optical components in the sub-picosecond regime

Laser damage density measurement of optical components in the sub-picosecond regime

Optical characterizations and thermal analyses of HfO2/SiO2 multilayered diffraction gratings for high-power continuous wave laser

A New Microhardness Testing Method on Grating Films

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Optical characterizations and thermal analyses of HfO₂/SiO₂ multilayered diffraction gratings for high-power continuous wave laser