Affiliation:
1. Guangdong Engineering Technology Research and Development Center of High-Performance Fiber Laser Techniques and Equipments
2. Hengqin Firay Sci-Tech Company Ltd.
Abstract
An over-20-octaves-bandwidth ultralow-intensity-noise 1064-nm single-frequency fiber laser (SFFL) is demonstrated based on a comprehensive all-optical technique. With a joint action of booster optical amplifier (BOA) and reflective Yb-doped fiber amplifier (RYDFA), two-fold optical gain saturation effects, respectively occurring in the media of semiconductor and fiber, have been synthetically leveraged. Benefiting from the gain dynamics in complementary time scales, i.e., nanosecond-order carrier lifetime in BOA and millisecond-order upper-level lifetime in RYDFA, the relative intensity noise (RIN) is reduced to −150 dB/Hz from 0.2 kHz to 350 MHz, which exceeds 20-octaves bandwidth. Remarkably, a maximum suppressing ratio of >54 dB is obtained, and the RIN in the range of 0.09–10 GHz reaches −161 dB/Hz which is only 2.3 dB above the shot-noise limit. This broad-bandwidth ultralow-intensity-noise SFFL can serve as an important building block for squeezed light generation, space laser communication, space gravitational wave detection, etc.
Funder
Special Project for Research and Development in Key Areas of Guangdong Province
Major Program of the National Natural Science Foundation of China
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Guangdong Special Support Plan
China Postdoctoral Science Foundation
Basic and Applied Basic Research Foundation of Guangdong Province
Guangdong Pearl River Talents Program
State Key Lab of Luminescent Materials and Devices, South China University of Technology
Subject
Atomic and Molecular Physics, and Optics