中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2839-2845.doi: 10.1088/1674-1056/18/7/036
张彦鹏1, 卢克清2, 张美志3, 程光华3, 李可昊3, 张贻齐3, 张玉虹3
Zhang Mei-Zhi(张美志)a)b)†, Lu Ke-Qing(卢克清)a), Cheng Guang-Hua(程光华)a), Li Ke-Hao(李可昊)a)b), Zhang Yi-Qi(张贻齐)a)b), Zhang Yu-Hong(张玉虹)a)b), and Zhang Yan-Peng(张彦鹏)c)
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 r < 1 (r is the normalized intensity at infinity), the full width at half maximum (FWHM) of solitons decreases monotonically to a constant value; when r > 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 r < 1, and increases with increasing intensity ratio for r > 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.
中图分类号: (Optical solitons; nonlinear guided waves)