Developing KH2PO4and KD2PO4crystals for the world's most power laser

Yoreo, James J. De; Burnham, Alan K.; Whitman, Pamela K.

doi:10.1179/095066001225001085

Cited by 460 publications

(242 citation statements)

References 7 publications

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“…In the 1990s, the rapid growth technique was developed to grow large-scale (40-50 cm) KDP boules at a rate of 10-20 mm/day [2,3] , which was one of the seven wonders during NIF laser construction [4] . Due to a growth rate an order of magnitude faster than conventional growth, a greater number of bulk defects were formed, degrading the performance of the crystals by causing pinpoint damage and optical losses, which adversely affected the quality of the downstream beam [1,5] . It was found that typical damage pinpoints were caused by defects, which efficiently absorbed laser energy, leading to a temperature rise and subsequent 'micro-explosion' [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

“…KH 2 PO 4 (KDP) crystals are important nonlinear optical materials in many applications, such as frequency converters and Pockel cells for high-power large-aperture laser systems [1] . In the 1990s, the rapid growth technique was developed to grow large-scale (40-50 cm) KDP boules at a rate of 10-20 mm/day [2,3] , which was one of the seven wonders during NIF laser construction [4] .…”

Section: Introductionmentioning

confidence: 99%

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Performance of rapid-grown KDP crystals with continuous filtration

Wang

Chang

et al. 2015

High Pow Laser Sci Eng

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Rapid growth processing of KDP crystals was improved by employing continuous filtration to eliminate bulk defects. The performances of the KDP crystals, including scattering defects, laser damage resistance and transmittance, were measured and analyzed. Compared with rapid-grown KDP without continuous filtration, the transmittance in the nearinfrared was increased by at least 2%, almost all of 'micron size' defects were eliminated and 'sub-micron size' defects were decreased by approximately 90%. Laser damage testing revealed that the laser-induced damage thresholds (LIDTs), as well as the consistency of the LIDTs from sample to sample, were improved greatly. Moreover, it identified that 'micron size' defects were the precursors which initiated laser damage at relative lower laser fluence (4-6 J cm −2 ), and there was a lower correlation between smaller size scattering defects and laser damage initiation. The improved consistency in the LIDTs, attributed to elimination of 'micron size' defects, and LIDT enhancement originated from the decreased absorption of the KDP crystals.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of rapid-grown KDP crystals with continuous filtration

Wang

Chang

et al. 2015

High Pow Laser Sci Eng

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“…These crystals often suffer from laser damage, which adversely affect the quality of downstream beam [1]. The observed damage thresholds of KDP/DKDP crystals are much lower than the intrinsic thresholds [2].…”

Section: Introductionmentioning

confidence: 99%

Transmittance increase after laser conditioning reveals absorption properties variation in DKDP crystals

Zhao

et al. 2012

Opt. Express

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By taking multiple measurements of transmittance before and after laser conditioning in DKDP crystals, we found that the transmittance was increased by 0.05%~0.4% through laser conditioning with maximum fluence 6J/cm 2 , and then decreased by about 0.1% after subsequent higher fluence conditioning. Variation of scattering intensity and absorber density, the two major factors leading to transmittance change, was monitored by on-line and off-line detection systems. The transmittance decrease was attributed to laser damage scattering, and the increase was derived from reduction of absorbers. Moreover, the absorption was reduced further at higher conditioning fluence. Based on the above analysis, the heating process during laser exposure was analyzed in the time domain, and a local rapid-rising and slow-cooling process was confirmed to reduce defect concentration, which can improve laser damage resistance and increase the transmittance.

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“…1,2 Both potassium dihydrogen phosphate (KDP) and DKDP crystals are nature choices for National Ignition Facility (NIF) simply because of their adequate nonlinear optical properties and availability in large growth sizes. Plates of DKDP crystals are needed for the third harmonic generation (THG) in NIF for that they can effectively reduce the transverse stimulated Raman scattering (TSRS).…”

Section: Introductionmentioning

confidence: 99%

Refractive indices in the whole transmission range of partially deuterated KDP crystals

Zhu

Zhang

et al. 2013

AIP Advances

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Refractive indices of partially deuterated potassium dihydrogen phosphate (DKDP) crystals with 55%, 70% and 80% deuterium contents were measured by auto-collimation method at 293 K between 0.254 to 1.529 μm. Dependence of refractive indices of DKDP on deuterium content show different trend in the infrared region as in uv-visible region. Dependence of n2 (the square of refractive index) on the mole fraction of deuterium shows a difference between pure KDP and partially deuterated KDP. The Sellmeier equations were obtained by the least square method. The non-critical phase matching angles calculated from the fitted formula were in good agreement with laser experiment results, by which the reliability of these Sellmeier equations was confirmed.

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Developing KH₂PO₄and KD₂PO₄crystals for the world's most power laser

Cited by 460 publications

References 7 publications

Performance of rapid-grown KDP crystals with continuous filtration

Performance of rapid-grown KDP crystals with continuous filtration

Transmittance increase after laser conditioning reveals absorption properties variation in DKDP crystals

Refractive indices in the whole transmission range of partially deuterated KDP crystals

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