Investigation of bulk laser damage in KDP crystal as a function of laser irradiation direction, polarization, and wavelength

Yoshida, Hidetsugu; Jitsuno, Takahisa; Fujita, Hisanori; Nakatsuka, M.; Yoshimura, Masashi; Sasaki, T.; Yoshida, Kunio

doi:10.1007/s003400050032

Cited by 100 publications

(49 citation statements)

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“…[4][5][6] Our observations reported here indicate that DKDP bulk damage sites have a complicated morphology, which depends on the laser parameters by which the bulk damage was created. Figure 1 depicts measurements of bulk damage sites by bright field microscopy, SEM, and 2D Micro-Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 74%

A summary of recent damage-initiation experiments on KDP crystals

et al. 2005

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We summarize recent investigations of the density and morphology of bulk damage in KDP crystals as a function of pulse duration, temporal profile, wavelength, and energy fluence. As previously reported by Runkel et al. 1, we also find that the size of bulk damage sites varies roughly linearly with pulse duration for pulses between 1 ns and 9 ns. However this trend no longer applies at pulse durations below 1 ns. Experiments measuring the damage density and size distribution as a function of wavelength confirm many previous works which indicated a strong dependence of damage density with wavelength. However, we also find that the size of damage sites is relatively insensitive to wavelength. Further we see damage due to Flat-In-Time (FIT) pulses has different pulse length and fluence dependence than Gaussian pulses. We demonstrate that a simple thermal diffusion model can account for observed differences in damage densities due to square and Gaussian temporally shaped pulses of equal fluence. Moreover, we show that the key laser parameter governing size of the bulk damage sites is the length of time the pulse remains above a specific intensity. The different dependences of damage density and damage site size on laser parameters suggest different absorption mechanisms early and late in the damaging pulse.

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Section: Introductionmentioning

confidence: 74%

A summary of recent damage-initiation experiments on KDP crystals

et al. 2005

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“…Several laser parameters have a significant effect on the maximum safe operating fluence of a laser system. These include wavelength, pulse duration, beam contrast, and temporal pulse shape [1][2][3][4][5]. These coupled laser parameters define a huge parameter space, making testing at every combination problematic.…”

Section: Cw Carr Jb Trenholme and M L Spaethmentioning

confidence: 99%

“…Because damage data has historically been taken with pulses whose temporal shapes were (more or less) Gaussian [2,[6][7][8][9][10], it is desirable to base our predictions on data taken with Gaussian pulses of different pulse widths. To do so, we must adopt some parametric model of the damage process.…”

Section: Cw Carr Jb Trenholme and M L Spaethmentioning

confidence: 99%

“…A large body of work exploring the damage behavior of bulk damage behavior exists [1,2,9,[16][17][18][19][20][21][22], but for the purpose of testing the model we need only state that for damage initiated with third harmonic light at high fluence? precursors are known to be present in excess of 10 4 per mm 3 and that the measured pulse scaling is ~t 0.35 +/-0.05 .…”

Section: Max P T P N T =mentioning

confidence: 99%

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Effect of temporal pulse shape on optical damage

Carr

Trenholme

Spaeth

2007

Applied Physics Letters

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The conditions under which optical materials are susceptible to laser-induced damage is a topic which has been the subject of considerable study. Laser parameters such as wavelength and temporal pulse duration have been studied extensively. Until this work the effect of temporal pulse shape has not been considered. The authors present here data from a simple single-parameter model and a supporting experiment which predicts that a flat-in-time pulse will produce damage at approximately 80% of the fluence of a Gaussian pulse of the same duration.

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“…6,7,13 For pinpoints induced by 351-nm (3ω) light, size and density have been shown to depend on laser parameters such as pulse length, pulse duration, pulse shape, and fluence. 4,9,10,14,15 Both pinpoint size and density have been shown to vary with pulse duration for a fixed fluence. It has been previously demonstrated that the pinpoint density as a function of fluence, ρ(φ 1 ), measured for one pulse duration (τ 1 ) may be used to estimate the damage produced as a function of fluence by a second pulse duration (τ 2 ).…”

mentioning

confidence: 99%