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725 nm watt-level injection-locked continuous-wave Ti:sapphire laser for a mercury optical lattice clock

Authors :
Qixin Liu
Jianfang Sun
Ye Zhang
Zhen Xu
Source :
Applied optics. 60(34)
Publication Year :
2022

Abstract

We develop a watt-level 725 nm continuous-wave tunable narrow linewidth injection-locked Ti:sapphire laser. The seed laser is frequency-locked on a Fabry–Perot cavity to narrow the linewidth and stabilize the frequency. Because the wavelength of the seed laser is located at the edge of the gain profile of the Ti:sapphire crystal, it is difficult to injection-lock the Ti:sapphire laser at 725 nm. A cavity mirror, which has a long-pass-filter coating with a sharp edge, is used in the Ti:sapphire cavity to suppress mode competition from the long wavelength side. This method effectively reduces the power requirement of the seed laser at 725 nm, and the Ti:sapphire laser can be injection-locked at higher output power. As a result, a 1 W output power with a 27% slope efficiency is achieved in the injection-locked laser, and a 210 mW UV laser is obtained in a subsequent second-harmonic generation stage. To the best of our knowledge, this is the shortest wavelength for the watt-level injection-locked continuous-wave Ti:sapphire laser. This laser will be used in a mercury optical lattice clock in the future.

Details

ISSN :
15394522
Volume :
60
Issue :
34
Database :
OpenAIRE
Journal :
Applied optics
Accession number :
edsair.doi.dedup.....7dbd6e930294e81b8e0b6f1429ad4c0f