Diffraction efficiency analysis of the phase grating in paraelectric KTN crystal

SONG Yan-sheng; JI Jia-rong; DOU Wen-hua; WEN Chang-li

doi:10.3969/j.issn.1001-3806.2010.01.024

LASER TECHNOLOGY > 2010 > 34(1): 85-87. > DOI: 10.3969/j.issn.1001-3806.2010.01.024

SONG Yan-sheng, JI Jia-rong, DOU Wen-hua, WEN Chang-li. Diffraction efficiency analysis of the phase grating in paraelectric KTN crystal[J]. LASER TECHNOLOGY, 2010, 34(1): 85-87. DOI: 10.3969/j.issn.1001-3806.2010.01.024

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Diffraction efficiency analysis of the phase grating in paraelectric KTN crystal

1.
College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;
2.
College of Computer, National University of Defense Technology, Changsha 410037, China

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Received Date: November 06, 2008
Revised Date: December 17, 2008
Published Date: January 24, 2010

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Abstract

In order to improve the diffraction efficiency of read out light,reasonable parameters must be selected. Combining Kogelnik coupling wave theory with the Kukhtarev equations, the expression of the diffraction efficiency of the transmission grating in paraelectric KTN crystal was obtained. After analyzing the factors affecting the diffraction efficiency of a grating,it was found that the reading diffraction efficiency was sensitive to incident angle, crystal thickness and applied field. A high diffraction efficiency district existed in close vicinity of 45° incident angle. The influence of absorption of crystal on reading diffraction efficiency was negligible. The results provide useful guides to choose the optimal parameters for high reading diffraction efficiency in application.
- nonlinear optics,
- diffraction efficiency analysis,
- coupling wave theory,
- photorefractive effect,
- paraelectric phase,
- holographic phase grating

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References

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