Cascaded nonlinear optical gain modulation for coherent femtosecond pulse generation

Author:

Qi Weiao12,Zhou Jiaqi12ORCID,Cao Xinru1,Cheng Zhi13,Jiang Huawei1,Cui Shuzhen12,Feng Yan124ORCID

Affiliation:

1. Chinese Academy of Sciences, and Shanghai Key Laboratory of Solid-State Laser and Application

2. University of the Chinese Academy of Sciences

3. School of Optical and Electronic Information & Wuhan National Laboratory for Optoelectronics

4. University of Chinese Academy of Sciences

Abstract

Nonlinear optical gain modulation (NOGM) is a method to generate high performance ultrafast pulses with wavelength versatility. Here we demonstrate coherent femtosecond Raman pulse generation through cascaded NOGM process experimentally. Two single-frequency seed lasers (1121 and 1178 nm) are gain-modulated by 117 nJ 1064 nm picosecond pulses in a Raman fiber amplifier. Second-order (1178 nm) Stokes pulses are generated, which have a pulse energy of 76 nJ (corresponding to an optical conversion efficiency of 65%) with a pulse duration of 621 fs (after compression). Dynamic evolution of both pump and cascaded Stokes pulses within the Raman amplifier are investigated by numerical simulations. The influences of pump pulse duration and energy are studied in detail numerically. Moreover, the simulations reveal that NOGM pulses with higher energy and shorter pulse duration could be obtained by limiting the impact of walk-off effect between pump and Raman pulses. This approach can offer a high energy and wavelength-agile ultrafast source for various applications such as optical metrology and biomedical imagining.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Natural Science Foundation of Shanghai

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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