Work

Fiber laser frequency stabilization at 780 nm via second-harmonic generation and modulation transfer spectroscopy reaching 10 −13 stability

Year: 2026

Type: article

Abstract: We demonstrated a high-performance frequency stabilization system based on a 1560 nm fiber laser frequency-doubled to 780 nm and locked to the 87 Rb D 2 line via modulation transfer spectroscopy. By optimizing spectroscopic parameters and suppressing noise, aided by the introduction of an intensity-noise-equivalent laser power (INELP) concept for accurate in-loop noise assessment, the short-term stability reached 3.32 × 10 −13 / τ . With additional active power stabilization using a fiber-coupled AOM, the system achieved 2.8 × 10 −13 at an integration time of 20 s and did not exceed 4 × 10 −12 until 10 4 s. The current stability is primarily limited by the servo bandwidth constrained by the piezoelectric actuator resonance (∼20 kHz); a fast feedback loop via an AOM is envisioned to further improve the short-term stability.

Source: Optics Express

DOI: 10.1364/oe.591087

Authors: Jinzhu Feng, Lulu Yan, Yang Bai, Jun Ruan, Shougang Zhang

Institutions: Chinese Academy of Sciences, University of Chinese Academy of Sciences

Language: English

Topic: Advanced Frequency and Time Standards

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Natural Science Foundation of China