To establish an effective and nondestructive subsurface defects detection technology
the fluorescence image technique of optics subsurface defect was studied. A small-aperture fluorescent defect-detection prototype was developed by systematically optimizing various parameters such as the excitation wavelength
imaging spectrum
imaging light path
and the detector. Based on the prototype
the surface and subsurface fluorescence defects of the finishing processing of fused silica and diamond fly-cutting processing KDP were characterized. The laser-induced damage threshold was measured by a 351-nm nanosecond pulsed laser. There is a significant difference in the subsurface defects of various samples
ranging from 0.012% to 1.1%. The relationship between the subsurface defects and the damage threshold was analyzed by statistical methods. The results show that the
R
2
value of the fused silica subsurface defect and the damage threshold curve is 0.907
and the
R
2
value of the KDP crystal subsurface defect and the damage threshold correlation curve is 0.947; both are strongly related. The results can be used to evaluate the processing quality of the optical components.Because of its nondestructive and short duration characteristics
the technique can be applied to the detection of full-area subsurface defects in large-dimension UV optical components
which makes it vital in engineering.
关键词
Keywords
references
MOSES E I, CAMPBELL J H, STOLZ C J, et al .. The national ignition facility: the world's largest optics and laser system[J]. SPIE , 2003, 5001:1-15.
MOSES E I. National ignition facility: 1.8 MJ, 750 TW ultraviolet laser[J]. SPIE , 2004, 5341: 13-24.
ANDRE M L. Status of the LMJ project[J]. SPIE , 1996, 3047: 38-42.
PENG H S, ZHANG X M, WEI X F, et al .. Design of 60-kJ SG-Ⅲ laser facility and related technology development[J]. SPIE , 2001, 4424: 98-103.
XIAO G Y, FAN D Y, WANG S J, et al .. SG-Ⅱ solid-state laser ICF system[J]. SPIE , 1998, 3492: 890-895.
CAMP D M, KOZLOWSKI M R, SHEEHAN L M, et al .. Subsurface damage and polishing compound affect the 355 nm laser damage threshold of fused silica surfaces[R].UCRL-JC-129301, 1997.
GÉNIN F Y, SALLEO A, PISTOR T V, et al .. Role of light intensification by cracks in optical breakdown on surfaces[J]. Journal of the Optical Society of America A , 2001, 18(10): 2607-2616.
YANG M H, QI H J, ZHAO Y N, et al .. Reduction of the 355-nm laser-induced damage initiators by removing the subsurface cracks in fused silica [J]. SPIE , 2011, 8206: 82061C-1-7.
NEAUPORT J, CORMONT P, LAMAIGNÈRE L, et al .. Concerning the impact of polishing induced contamination of fused silica optics on the laser-induced damage density at 351 nm[J]. Optics Communications, 2008, 281(14): 3802-3805.
LIU H J, HUANG J, YE X, et al .. Residual impurities on fused silica surface processed by different technics and their effects on laser induced damage at 355 nm [J]. Optoelectron. Adv. Mater., 2015, 17:1406-1410.
LIU H J, YE X, ZHOU X D, et al .. Subsurface defects characterization and laser damage performance of fused silica optics during HF-etched process [J]. Optical Materials , 2014, 36(5): 855-860.
LIU H J, HUANG J, WANG F R, et al .. Subsurface defects of fused silica optics and laser induced damage at 351 nm[J]. Optics Express , 2013, 21(10): 12204-12217.
NEAUPORT J, AMBARD C, CORMONT P, et al .. Subsurface damage measurement of ground fused silica parts by HF etching techniques[J]. Optics Express , 2009, 17(22): 20448-20456.
SURATWALA T, WONG L, MILLER P, et al .. Sub-surface mechanical damage distributions during grinding of fused silica[J]. Journal of Non-Crystalline Solids , 2006, 352(52/53/54): 5601-5617.
ZHOU Y Y, FUNKENBUSCH P D, QUESNEL D J, et al .. Effect of etching and imaging mode on the measurement of subsurface damage in microground optical glasses[J]. Journal of the American Ceramic Society , 1994, 77(12): 3277-3280.
MENAPACE J A, DAVIS P J, STEELE W A, et al .. MRF applications: measurement of process-dependent subsurface damage in optical materials using the MRF wedge technique[R]. UCRL-PROC-217271, 2005.
LIU J, MA ZH L, WANG J L, et al .. Research status of subsurface damage detection technology of optical elements[J] . Laser & Optoelectronics Progress, 2011, 48:081204. (in Chinese)
TIAN A L, DANG J J, WANG CH H, et al .. Optical subsurface damage detection and its analysis[J]. Journal of Xi'an Technological University, 2011, 31(4):24-28. (in Chinese)
FÄHNLE O, WONS T, KOCH T, et al .. ITIRM as a tool for qualifying polishing processes [J]. Appl. Opt., 2002, 41: 4036-4038.
WUTTIG A., STEINERT J, DUPARRE A. et al .. Surface roughness and subsurface damage characterization of fused silica substrates[J]. SPIE , 1999, 3739: 369-376.
MA B, SHEN Z X, HE P F, et al .. Detection of subsurface defects of fused silica optics by confocal scattering microscopy [J]. Chinese Optics Letters, 2010, 8(3):296-299.
CHENG J, WANG J H, ZHANG P Y, et al .. Experimental study on HF etching of fused silica[J]. High Power Laser and Particle Beams , 2017, 29(11): 8-14. (in Chinese)
ZHU Y N, MAI L B, LIU Q M et al .., Test methods for laser induced damage threshold of optical surfaces.Part 1: 1 on 1 test, GB/T 16601-1996[S]. National Technology Supervision Bureau, 1996. (in Chinese)