A Highly Efficient Hybrid Fiber Optic Laser Using a Cesium Atom Vapor Cell as an Optical Gain Medium
Abstract
A new scheme of a highly efficient hybrid laser cavity is proposed and experimentally demonstrated utilizing a hot cesium (Cs) vapor cell as an optical gain medium. The laser cavity consists of a macroscopic concave reflecting mirror (>99% reflectivity) and a 4% Fresnel-reflecting perpendicularly cleaved facet of a single mode fiber (SMF). The cylindrical cesium gain cell is located between these two reflectors. The SMF serves multiple roles: 1) a passive mode-matching component to approximate the pump beam diameter to that of the laser cavity mode within the cesium cell, 2) an output coupler with low reflectivity, and 3) a high beam-quality laser delivery with a low loss. Optimizing the pump beam waist diameter and the cesium vapor cell temperature, a high slope efficiency of 86% and continuous wave power of 419 mW were obtained in the pump power range of 400 to 600 mW, with an optical-to-optical conversion efficiency of 71%. The unique multi-functional role of the SMF in the hybrid cavity is fully described, and it can also be applied to other phases of high optical gain media.
Cite
@article{arxiv.2405.05569,
title = {A Highly Efficient Hybrid Fiber Optic Laser Using a Cesium Atom Vapor Cell as an Optical Gain Medium},
author = {Seokjin Kim and Mingyu Lee and Sanggwon Song and Seongjin Hong and Johan Nilsson and Kyunghwan Oh},
journal= {arXiv preprint arXiv:2405.05569},
year = {2024}
}
Comments
15 pages, 4 figures