Influence of period and amplitude of microwaviness on KH{sub 2}PO{sub 4} crystal's laser damage threshold

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3462430· OSTI ID:21476413

Mingjun, Chen; Mingquan, Li; Wei, Jiang ^[1]; Qiao, Xu ^[2]

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1. Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001 (China)
2. Chengdu Fine Optical Engineering Research Center, Chengdu, Sichuan 610041 (China)

The laser induced damage threshold (LIDT) has become a technical bottleneck which restricts the application and development of the inertial confinement fusion. Using single point diamond turning method to process KH{sub 2}PO{sub 4} (KDP) crystals, the periodic microwaviness will be left on the machined surface which has a significant impact on the LIDT. In this paper, after acquiring the frequency information of machined surface of KDP crystals with the power spectral density method, we analyze quantitatively the influence of microwaviness on the LIDT of KDP crystal with the Fourier modal theory. Research results indicate that: the surface morphology of KDP crystal is consisted of the subwaviness with different characteristic spatial frequencies; and the reduced amount of the LIDT of KDP crystal leaded by such subwaviness is different; the experimental results of the LIDT are consistent with the theoretical calculations basically; for the machine tool and the processing technology we used, the leading frequency of microwaviness which caused the LIDT decreasing is between (350 {mu}m){sup -1} and (30 {mu}m){sup -1}, especially between (90 {mu}m){sup -1} and (180 {mu}m){sup -1}.

• OSTI ID: 21476413
• Journal Information: Journal of Applied Physics, Vol. 108, Issue 4; Other Information: DOI: 10.1063/1.3462430; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
AMPLITUDES
CRYSTALS
DIAMONDS
IRRADIATION
LASER RADIATION
MICROWAVE RADIATION
MORPHOLOGY
PERIODICITY
PHYSICAL RADIATION EFFECTS
POTASSIUM PHOSPHATES
SPECTRAL DENSITY
SURFACES
ALKALI METAL COMPOUNDS
CARBON
ELECTROMAGNETIC RADIATION
ELEMENTS
FUNCTIONS
MINERALS
NONMETALS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POTASSIUM COMPOUNDS
RADIATION EFFECTS
RADIATIONS
SPECTRAL FUNCTIONS
VARIATIONS