Temporal behaviour of open-circuit photovoltaic solitons  

作　　者：张美志 卢克清 程光华 李可昊 张贻齐 张玉虹 张彦鹏 

机构地区：[1]State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciencess [2]Graduate School of Chinese Academy of Sciences [3]Department of Electronic Science and Technology,Xi'an Jiaotong University

出　　处：《Chinese Physics B》2009年第7期2839-2845,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No 10674176)

摘　　要：Based on the time-dependent band-transport model in a photorefractive medium,dark open-circuit photovoltaic （PV） solitons are investigated both theoretically and experimentally. Compared with those of the time-independent models,our theoretical results revealed that quasi-steady-state and steady-state PV solitons can both be obtained.Our results also revealed that when г〈1（г is the normalized intensity at infinity）,the full width at half maximum （FWHM） of solitons decreases monotonically to a constant value;when г〉1, however, the FWHM of solitons first decreases to a minimum before it increases to a constant value. Moreover,the FWHM of steady solitons decreases with increasing intensity ratio for г〈1,and increases with increasing intensity ratio for г〉1.We further observed dark PV solitons in experiments,and recorded their evolution.These results indicated that steady solitons can be observed at low optical power,while quasi-steady-state solitons can only be generated at higher optical power. Good agreement is found between theory and experiment.Based on the time-dependent band-transport model in a photorefractive medium,dark open-circuit photovoltaic （PV） solitons are investigated both theoretically and experimentally. Compared with those of the time-independent models,our theoretical results revealed that quasi-steady-state and steady-state PV solitons can both be obtained.Our results also revealed that when г〈1（г is the normalized intensity at infinity）,the full width at half maximum （FWHM） of solitons decreases monotonically to a constant value;when г〉1, however, the FWHM of solitons first decreases to a minimum before it increases to a constant value. Moreover,the FWHM of steady solitons decreases with increasing intensity ratio for г〈1,and increases with increasing intensity ratio for г〉1.We further observed dark PV solitons in experiments,and recorded their evolution.These results indicated that steady solitons can be observed at low optical power,while quasi-steady-state solitons can only be generated at higher optical power. Good agreement is found between theory and experiment.

关 键 词：temporal behaviour photovoltaic solitons photorefractive effect 

分 类 号：O437[机械工程—光学工程]