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

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.

Diffraction efficiency analysis of the phase grating in paraelectric KTN crystal

Corresponding author: JI Jia-rong, jijiarong@hotmail.com;

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

Received Date: 2008-11-07

Accepted Date: 2008-12-18

Available Online: 2010-01-25

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.

HTML

Reference (10)

[1]	KOGELNIK H.Coupled wave theory for thick hologram gratings[J].The Bell System Technical Journal,1969,48(9):2909-2947.
[2]	MA H B.Study on the affecting factors of ferroelectric phase transition[J].Joural of Jilin Normal University(Natural Science Edition),2007,74(1):74-78.
[3]	BITTON G,FELDMAN Y,AGRANAT A J.Relaxation processes of off-center impurities in KTN: Li crystals[J].Journal of Non-Crystalline Solids,2002,305(2):362-367.
[4]	TREPAKOV V A,JASTRABIK L,KAPPHAN S,et al.Phase transitions,related properties and possible applications of(K,Li)(Ta,Nb)O3 crystals[J].Optical Materials,2002,19(1):13-21.
[5]	AGRANAT A J,LEYVA V,SAYANO K,et al.Photorefractive properties of KTa1-xNbxO3 in the paraelectric phase[J].Proc SPIE,1989,1148:52-66.
[6]	AGRANAT A J,DEOLIVEIRA C,ORR G.Dielectric electrooptic gratings in potassium lithium tantalate niobate[J].Journal of Non-Crystalline Solids,2007,353(47/51):4405-4410.
[7]	YARIV A,ORLOV S S,RAKULJIC G A.Holographic storage dynamics in lithium niobate:theory and experiment[J].J O S A,1996,B13(11):2513-2523.
[8]	VOLK T,WHLECKE M.Thermal fixation of the photorefractive holograms recorded in lithium niobate and related crystals[J].Critical Reviews in Solid State and Materials Sciences,2005,30(1):125-151.
[9]	TADAYUKI I,MASAHIRO S,KOICHIRO N,et al.Crystal growth and electro-optic properties of KTa1-xNbxO3[J].Nippon Telegraph&Telephone Corporation Technical Review,2007,5(9):1-8.
[10]	JI J R.Advanced optics[M].Beijing:Science Press,2007:402-430(in Chinese)

Diffraction efficiency analysis of the phase grating in paraelectric KTN crystal

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views