,,. ,,, . 2 PACC: 4265S,4265J. I s, I b. I s e Tsinghua Tongfang Optical Disc Co., Ltd. All rights reserved.

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1 Π2003Π52 (02) Π ACTA PHYSICA SINICA Vol 52,No 2,February,2003 ν 2003 Chin Phys Soc 3 2 g (, ) ( ; ), 2,,, : 2,,, PACC: 4265S,4265J 11, 2,,, ;, 2 3 : ] 7 ] 2 [1 [4 [8 11 ] [12 ],,, [13 16 ] [17 22 ] 2, [23 ] [24 ],, 2, [25 ] [19,26 28 ],,, [29 ] [30, ] 2, [31,32],,,,,,,, 2 22 ], 21 [33,34],,,, I s, [35,36 ], I b I s e 2, I b o [17 3 ( : ) ( :99197) ( :001192) g Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved

2 [37 ] ^J [9 ],, J, E = ^E E, R = ko eff k e eff ( S s I s + + S b I b ) ( N d - N i d) - ^nn i d = 0, (1) ^J = [ q ^n^e + ( S s k e eff I s + S b k o eff I b ) ( N d - N i d) c ] = 0, (2) ^E + q ( ^n + N A - N i d) = 0, (3) s V = - lπ2 J = ne + (1 - N) ( u 2 + R) = conts, (2) d x ^E1 (4) - lπ2, k e eff k o d E = 0, (4) eff - lπ2l s Glass ; I s, I b ; 9 2 u ( ) S s, S b ; ^n 9 2 = ( + E) u ( b ) (6) ; N d ; N i d (6) n,,n ; N A ;,, (4) C = q V (1) L s ; ; ^J ; c [8 ; ; s N d µ N ] A n u2 + 1 rn (2) ; - q ; ^E ; V ( 1 rn = Ni d 1, N ν 1 N A (a) ) ; l J = (1 + u 2 ) E + ( u 2 + R),, J u 2 + R E =, 1 + u 2-1 (8) 1 + u 2 c R Glass Glass,c x, ^E = [9] 9 ^E S 9 b I b [9], x (1) + S b I b = S b (ΠS b + I b ) S b I b n ν N i d, N d, N A J = - CD + ldπl s R (8) s q 9 ^E ν 1 [9 ],(3) 9 x N A N i d, (5) E = - CD + ldπl s u 2 1 (9) 1 + u 2 [5,8 ] 9 9 z - i 2 k [5,8] 9 2 i kn 2 A ( x, z) = A ( x, z), (6) 9 x n b A ( x) = u ( x) I b S b exp (i z) (7) S s n = ^n, N = Ni d, r = an d N d N d, a = S b I b,= ke eff S b I b, E= N A N A a q, J= an d, J =,= x L s,l s = 1 ( 2 kb) 1Π2, b = ( k ) n3 b r eff n b 2q,, I b ϖ0,, a S b I b (1), (2), (4), (6) n = ( u 2 + 1) (1 - N)Π( rn), (1) C + lπ2l s (8) (4), D = 1Π lπ2l s 1 - lπ2l s 1 + u 2 d, (9), R,, 2 A ( x, z), n b, 1,n = - 2 n3 b r eff ^E, A ( x, z), 2 [17 22 ] Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved 2, (2), ( k o eff S b I b ( N d - N i d ) ) gr E

3 2 : (a), V ; (b),e [38 ], 330mWΠcm 2 ( 1 (b) ) 215nAΠcm 2, [38 ](511) ( ),, J ph I,, 330mWΠcm 2 10WΠcm 2, J ph 10-6 A cm 2 S = 0136cm 2, V = 5000V, gr =, 10 12, BDΠCD 70 S b Π= 10 9 cm - 1 s + lπ2 - lπ2, ^E d x LiNbO cm 2 ΠVs [8 ], BaTiO 3 015cm 2 Π + V + ^JSgR = 0 S Vs [39], KNSBN BaTiO 3, gr, + lπ2l s E d+ C + JB = 0, (10) [39 ], BaTiO - lπ2l 3 s, B = SgRJ Π( E L s ) (10) (8) = 011cm 2 V - 1 s - 1 BD10 4, E = - Y + u u 2, (11) [36 ], R > 1, R Y = ( - ldπl s CD + RBD)Π(1 + BD), (12) ; R < 1, R D = 1Π + lπ2l s 1 - lπ2l s 1 + u 2 d [35 ] [36 ], Y R < 1 R > 1, [36 ](5) R, R = 112, ( 2, Y a) ; R = 015, ( 2 b) < 1, Y ; gr V ( V Y > 1, Y gr 10 10,) BDΠCD1, Y( CDΠBD + (12) Y R, Y R,R Glass R V, R Y Y, Glass Y > 1 Y < 1 BDΠCD ν 1, Glass Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved l, D L s l Y( CD + RBD)Π(1 + BD), BDS b I b qn d SgRΠ(N A l), CDq VΠ( k e effn A l) KNSBN, CD BD BDΠCD = S b I b k e eff N d SgRΠV, S b I b k e [38,39 ] eff N d J ph,, I b = 10WΠcm 2 J - 1[40 ], N d ΠN A = 100 [40 ], SΠl = 0 6cm cm 2 ΠVs KNSBN, YR, [36 ], R R) R 1,

4 , 2 ( a) ( b) ( I b = 10WΠcm 2, S = 0 36cm 2, V = 5000V, gr = 10 12, S b Π= 10 9 cm - 1 s J - 1, N d ΠN A = 100, SΠl = 016cm,= 011cm 2 V - 1 s - 1, R = 112, u ( ) = 1 ( ),R = 015, u (0) = 1 ( ), YR) 31 I b ϖ0, S b I b, R D L s l (11) E = -,,, ( ) CD + u u 2 (13) ( ), [18 ](12),, [18 ], (11) E = - CDΠ(1 + BD) + u u 2 1 (14), CDΠ(1 + BD) > 1 ; CDΠ(1 + BD) < 1 [22 ], 2,,V =, 0, gr = (11) E = - R + u u 2 1 (15) [36 ],, ((2) ), [35,36 ],,,, 2,,,,,, 41,,, Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved

5 2 : [1] Duree G C Jr, Shultz J L, Salamo GJ, Segev M, Yariv A, Crosig2 nani B, Porto P D, Sharp E J and Neurgaonker R R 1993 Phys Rev Lett [2] Segev M, Crosignani B, Yariv A and Fischer B 1992 Phys Rev lett Maufoy J, Fressengeas N, Wolfersberger D and Kugel G1999 Phys Rev E [3] Duree G, Morin M, Salama G, Segev M, Crosinani B, Porto P D, Sharp E and Yariv A 1995 Phys Rev Lett [4] Castillo M D I, Aguilar P A M, Sanchez2Mondragon J J, Stepanov S and Vysloukh V 1994 Appl Phys Lett Shih M, Leach P, Segev M, Garrett M H, Salamo G and Valley G C 1996 Opt Lett [5] Segev M, Valley G C, Crosignani B, Porto P D and Yariv A 1994 Phys Rev Lett [6] Segev M, Shih M and Valley G C 1996 J Opt Soc Am B Christodoulides D N and Carvalho M I 1995 J Opt Soc Am B [7] Kos K, Meng H, Salamo G, Shih M, Segev M and Valley G C 1996 Phys Rev E 53 R4330 Ryf R, Wiki M, Montemezzani G, Guter P and Zozulya A A 1999 Opt Commum [8] Segev M, Valley G C, Bashaw M C, Taya M and Fejer M M 1997 J Opt Soc Am B Ling Z F, Guo R, Liu S M and Zhang G Y 2000 Acta Phys Sin (in Chinese) [ 2000 [31] Shih M F and Sheu F W 1999 Opt Lett ] [9] Valley G C, Segev M, Crosignani B, Yariv A, Fejer M M and Bashaw M C 1994 Phys Rev A 50 R4457 [10] Taya M, Bashaw M C, Fejer M M, Segev M and Valley G C 1995 Phys Rev A Chen Z, Segev M, Wilson D W, Muller R E and Maker P D 1997 Phys Rev Lett [11] She W L, Lee K K and Lee W K 1999 Phys Rev Lett [12] Mitchell M, Segev M 1997 Nature [13] Christodoulides D N, Coskun T H et al 1997 Phys Rev Lett Christodoulides D N, Coskun T H et al 1998 Phys Rev Lett [14] Mitchell M, Chen Z, Shih M and Segev M 1996 Phys Rev Lett [15] Wang X S, She WL 2002 Acta Phys Sin (in Chinese) [ ] [16] Chen Z, Mithell M, Segev M, Coskun T H and Christodoulides D N 1998 Science [17] Liu J S et al 1998 Acta Phys Sin (in Chinese) [ ] [18] Lu KQ, Tang T T 1999 Acta Phys Sin (in Chinee) [ ] [19] Hou C F et al 2000 Acta Phys Sin (in Chinese) [ ] [20] Liu J S et al 2000 Chin Phys [21] Liu J S et al 2001 Acta Phys Sin (in Chinese) [ ] [22] Liu J S 2001 Chin Phys Liu J S, Hao Z H 2002 Chin Phys [23] She W L, Lee K K, Lee W K 2000 Phys Rev Lett [24] She W L et al 2001 Acta Phys Sin (in Chinese) [ ] [25] Wang X S et al 2001 Acta Phys Sin (in Chinese) [ ] [26] Christodoulides D N, Singh S R et al 1996 Appl Phys Lett [27] Chen Z, Segev M et al 1996 Opt Lett [28] Chen Z, Segev M et al 1996 Opt Lett [29] Stegeman A and Segev M 1999 Science [30] Delre E, Tamburrini M et al 1999 Phys Rev Lett [32] Hou C F et al 2001 Acta Phys Sin (in Chinese) [ ] Hao Z H et al 2002 Acta Phys Sin (in Chinese) [ ] [33] Anastassiou C et al 1998 Opt Lett [34] Bian S, Frejlich J and Ringhofer K H 1997 Phys Rev Lett [35] She W L, Chan C W and Lee W K 2001 Opt Lett [36] She W L, Wang X S et al 2001 Acta Phys Sin (in Chi2 nese) [ ] [37] Kukhtarev N V 1979 Ferroelectrics [38] Zhang Y L 1997 Ph D Thesis ( Guangzhou : Zhongshan Univrsity) [ 1997 ( : ) ] [39] Valley G C and Klein M B 1983 Optical Engineering [40] Li Y, Hou F, Zhou G, Xu K and Hong J 1996 Chinese Journal of Lasers B Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved

6 Screening2p hotovoltaic solito ns affected by the p hotovoltaic effect of a background beam 3 Wang Xiao2Sheng Ouyang Shi2Gen She Wei2Long g ( State Kdy Laboratory of Optoelectronic Materials and Technologies, Zhongshan University, Guangzhou , China) (Received 12 January 2002 ; revised manuscript received 26 June 2002) Abstract The photovoltaic effect of a background beam do not affect the spatial2charge field in a photovoltaic crystal with a constant external applied field, but has an effect on the current density in the crystal If the crystal is connected with an external circuit which includes a resistor and a constant voltage source, the photovoltaic effect of the background beam will affect the full width at half maximum of the solitons, even switch the bright solitons, to the dark solitons, or vice versa Keywords : screening2photovoltaic solitons, spatial solitons, bright, dark solitons switching PACC: 4265S, 4265J 3 Project supported by the National Natural Science Foundation of China ( Grant No ),the Science Foundation from Ministry of Education, China ( Grant No 99197), and the Natural Science Foundation of Guangdong Province, China ( Grant No ) g Corresponding author Tsinghua Tongfang Optical Disc Co, Ltd All rights reserved