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Wei X.,Chengdu Fine Optics and Engineering Research Center | Chai L.,Chengdu Fine Optics and Engineering Research Center | Li Q.,Chengdu Fine Optics and Engineering Research Center | Gao B.,Chengdu Fine Optics and Engineering Research Center
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

Residual stress birefringence in crystal will affect frequency conversion efficiency and beam quality. In this paper the distribution characteristics of inherent stress birefringence in crystal is analyzed, through delicate adjustment the optical axis is oriented and qualitative results obtained for KDP crystals are presented and discussed by imaging digital stress measurement instrument, and the stress gradient distribution is calculated, also the effect of deviation from optical axis on the measured stress distribution results is discussed. © 2012 SPIE.


Wei X.-H.,Chengdu Fine Optics and Engineering Research Center | Gao B.,Chengdu Fine Optics and Engineering Research Center | Li Q.,Chengdu Fine Optics and Engineering Research Center | Xu K.-Y.,Chengdu Fine Optics and Engineering Research Center | And 2 more authors.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2011

Using the high precision digital stress measurement instrument, we measured the stress of KDP crystal. Through measuring the optical axis of KDP, the birefringence of ordinary light and extraordinary light is diminished, and the inner stress of the KDP is gained, The repeatability of measurement is better than 0.1 nm/cm. The high precision digital stress measurement of KDP is of great importance to machining and utilization.


Gao B.,Chengdu Fine Optics and Engineering Research Center | Li Q.,Chengdu Fine Optics and Engineering Research Center | Liu A.,Chengdu Fine Optics and Engineering Research Center | He Y.,Chengdu Fine Optics and Engineering Research Center | Chai L.,Chengdu Fine Optics and Engineering Research Center
Guangxue Xuebao/Acta Optica Sinica | Year: 2014

A method for reconstruction surfaces map on iterative algorithm is presented. According to flipping and rotationg one of the two plates, four measurements are generated. The formulas are directly derived from four measurements that require rotation or flipping operations. Three trial surfaces are initialized, then the new surfaces are calculated according to the formulas. The trial surfaces are replaced by the new surfaces. The experiment shows that this method can achieve a deviation of 0.1 nm, which only requires no more than 50 iterations.And the error sources are analyzed in detail. The total measuring error of this method is 1.417 nm. ©, 2014, Chinese Optical Society. All right reserved.


Wei X.,Chengdu Fine Optics and Engineering Research Center | Gao B.,Chengdu Fine Optics and Engineering Research Center | Li Q.,Chengdu Fine Optics and Engineering Research Center | Xu K.,Chengdu Fine Optics and Engineering Research Center | And 3 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2015

Using the high precision digital stress measurement instrument, the distribution of stress birefringence (SBR) of optical glass is digitally measured. Experiment shows that the impact of temperature and gravity on the stress birefringence of glass cannot be neglected, compared to the first measurement result, the max value of SBR reduces 83%, and the root mean square (RMS) value reduces 87%. Also, when temperature maintains constant, the effect of gravity is still obvious, experimental result shows that the max value of SBR increases 68%, and the RMS value increases 90% in this situation. The stress birefringence of optical material/glass distribution measurement with high precision has great impact on optical machining. © 2015, Chinese Lasers Press. All right reserved.

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