中国物理B ›› 2019, Vol. 28 ›› Issue (6): 64206-064206.doi: 10.1088/1674-1056/28/6/064206
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Jianyu Zhang(张剑宇), Yunxu Sun(孙云旭), Qinghai Song(宋清海)
Jianyu Zhang(张剑宇)1, Yunxu Sun(孙云旭)1, Qinghai Song(宋清海)2
摘要:
A comprehensive study on the requirements for the highly efficient third harmonic generation (THG) and its inverse process, one-third harmonic generation (OTHG), in lossy waveguides is proposed. The field intensity restrictions for both THG and OTHG caused by loss are demonstrated. The effective relative phase ranges, supporting the positive growth of signal fields of THG and OTHG are shrunken by the loss. Furthermore, it turns out that the effective relative phase ranges depend on the intensities of the interacting fields. At last, a modified definition of coherent length in loss situation, which evaluates the phase matching degree more precisely, is proposed by incorporating the shrunken relative phase range and the nonlinear phase mismatch. These theoretical analysis are valuable for guiding the experimental designs for highly efficient THG and OTHG.
中图分类号: (Nonlinear optics)