High-precision measurement system for the Z-cut angle of uniaxial crystals based on conoscopic interference - Details

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Pockels　cells　require　the　surface　normal　of　the　potassium　dihydrogen　phosphate　(KDP)　crystal　to　be　aligned　parallel　to　the　crystal’s　optical　axis.　Minor　cutting　errors,　notably　incorrect　Z-cut　angles,　can　impair　the　electro-optic　modulation　capability.　We　propose　a　high-precision　measurement　system　for　the　Z-cut　angle　of　uniaxial　crystals　based　on　conoscopic　interference.　This　system　uses　a　motion　compensation　trajectory,　derived　from　reflected　light　coordinates,　to　correct　tilt　and　rotation　errors.　This　approach　obviates　the　need　for　real-time　posture　monitoring　during　tests　and　maintains　crystal　alignment　to　within　0.02　mrad.　The　ray　tracing　model　correlates　the　Z-cut　angle　with　melatope　trajectory　radii　in　the　interference　patterns,　achieving　a　spatial　resolution　error　below　0.3　µrad/pix,　mainly　due　to　lens　reinstallation　errors.　Experimental　results　indicate　that　the　Z-cut　angles　achieves　a　Peak-to-Valley　(PV)　of　less　than　0.03　mrad　and　a　Root　Mean　Square　(RMS)　of　less　than　0.01　mrad.　Compared　to　the　best　parameters　reported　by　other　researchers,　this　system　offers　2.25　times　better　repeatability　and　1.65　times　finer　spatial　resolution.　©　2025　Optica　Publishing　Group　under　the　terms　of　the　Optica　Open　Access　Publishing　Agreement.

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[ 1 ] [Guo G.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 2 ] [Guo G.]School of Optoelectronics, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 3 ] [Chow Y.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 4 ] [Chow Y.]College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, 401331, China
[ 5 ] [Zhong T.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 6 ] [Zhong T.]College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, 401331, China
[ 7 ] [Wang Z.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 8 ] [Wang Z.]School of Optoelectronics, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 9 ] [Cheng W.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 10 ] [Cheng W.]School of Optoelectronics, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 11 ] [Wang Y.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 12 ] [Wang Y.]College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, 401331, China
[ 13 ] [Zhu Y.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 14 ] [Zhu Y.]School of Optoelectronics, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 15 ] [Yang Y.]School of Optoelectronics, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 16 ] [Yang Y.]College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, 401331, China
[ 17 ] [Shi Y.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 18 ] [Shi Y.]School of Optoelectronics, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 19 ] [Rong L.]School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, China
[ 20 ] [Wang K.]College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, 401331, China
[ 21 ] [Zhang T.]School of Optoelectronics, University of Chinese Academy of Sciences, Beijing, 100049, China
[ 22 ] [Fan Z.]Department of Optical Engineering Research, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
[ 23 ] [Fan Z.]School of Optoelectronics, University of Chinese Academy of Sciences, Beijing, 100049, China

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Optics Express

ISSN： 1094-4087

Year： 2025

Issue： 8

Volume： 33

Page： 17378-17392

3 . 8 0 0

JCR@2022

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ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 5

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