A highly efficient hybrid fiber optic laser using a cesium atom vapor cell as an optical gain medium
A highly efficient hybrid fiber optic laser using a cesium atom vapor cell as an optical gain medium
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 reflector (> 99% reflectivity) and a 4% Fresnel-reflecting facet of a single mode fiber (SMF). The 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 a low reflectivity, and (3) a low loss laser delivery with a high beam-quality. Optimizing the pump beam waist diameter and the cesium vapor cell temperature, a high slope efficiency of 86% and an optical-to-optical conversion efficiency of 71% were achieved in the pump power range of 400–600 mW. The unique multi-functional role of the SMF in the hybrid cavity is fully described, which can also be applied to other high optical gain media.
Alkali atom vapor, Atom laser, Fiber optics, Hybrid cavity, Laser efficiency
Kim, Seokjin
c4de36d7-f2ad-4724-8b7c-6da225a7dbac
Lee, Mingyu
58af6473-fe0d-484f-9d0b-2d1e14b47a51
Song, Sanggwon
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Hong, Seongjin
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Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Oh, Kyunghwan
b4a576b7-fc35-4c55-aa2a-50b3f3260d1b
3 March 2025
Kim, Seokjin
c4de36d7-f2ad-4724-8b7c-6da225a7dbac
Lee, Mingyu
58af6473-fe0d-484f-9d0b-2d1e14b47a51
Song, Sanggwon
dd3c04c5-ae9b-48eb-89ce-a9fdd89c38b3
Hong, Seongjin
e102617b-d5f7-435d-a5a3-5d4b1272e63b
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Oh, Kyunghwan
b4a576b7-fc35-4c55-aa2a-50b3f3260d1b
Kim, Seokjin, Lee, Mingyu, Song, Sanggwon, Hong, Seongjin, Nilsson, Johan and Oh, Kyunghwan
(2025)
A highly efficient hybrid fiber optic laser using a cesium atom vapor cell as an optical gain medium.
Scientific Reports, 15 (1), [7469].
(doi:10.1038/s41598-025-90442-0).
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 reflector (> 99% reflectivity) and a 4% Fresnel-reflecting facet of a single mode fiber (SMF). The 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 a low reflectivity, and (3) a low loss laser delivery with a high beam-quality. Optimizing the pump beam waist diameter and the cesium vapor cell temperature, a high slope efficiency of 86% and an optical-to-optical conversion efficiency of 71% were achieved in the pump power range of 400–600 mW. The unique multi-functional role of the SMF in the hybrid cavity is fully described, which can also be applied to other high optical gain media.
Text
s41598-025-90442-0
- Version of Record
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Accepted/In Press date: 13 February 2025
Published date: 3 March 2025
Additional Information:
Publisher Copyright:
© The Author(s) 2025.
Keywords:
Alkali atom vapor, Atom laser, Fiber optics, Hybrid cavity, Laser efficiency
Identifiers
Local EPrints ID: 502269
URI: http://eprints.soton.ac.uk/id/eprint/502269
ISSN: 2045-2322
PURE UUID: 5834e953-311a-43b7-8571-0b04bb6de0c4
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Date deposited: 19 Jun 2025 16:57
Last modified: 22 Aug 2025 01:43
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Contributors
Author:
Seokjin Kim
Author:
Mingyu Lee
Author:
Sanggwon Song
Author:
Seongjin Hong
Author:
Johan Nilsson
Author:
Kyunghwan Oh
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