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Polarized spectroscopy and SESAM mode-locking of Tm,Ho:CALGO
Optics Express
|March 18, 2022
Summary
This study demonstrates a Tm,Ho:CALGO laser achieving 52 fs pulses at 2015 nm. The laser also achieved 1.01 W continuous-wave output power, showcasing its potential for various applications.
Area of Science:
- Laser physics
- Solid-state materials
- Spectroscopy
Background:
- Thulium (Tm) and Holmium (Ho) co-doped lasers are crucial for mid-infrared applications.
- Cerium-doped LiCaAlF6 (CALGO) crystals offer unique optical properties.
- Passively mode-locked lasers require efficient saturable absorbers for ultrashort pulse generation.
Purpose of the Study:
- To investigate the performance of a Tm,Ho:CALGO laser passively mode-locked with a SESAM.
- To achieve ultrashort pulse generation and high output power.
- To analyze the influence of polarized spectroscopic properties on laser performance.
Main Methods:
- Utilizing a Tm,Ho:CALGO crystal as the gain medium.
- Employing a Gallium Antimonide (GaSb)-based Semiconductor Saturable Absorber Mirror (SESAM) for passive mode-locking.
- Characterizing laser output in both mode-locked and continuous-wave (CW) regimes.
- Revisiting polarized spectroscopic properties of Ho3+ ions.
Main Results:
- Generation of 52 fs ultrashort pulses at a central wavelength of 2015 nm.
- Broad spectral bandwidth of 82 nm (FWHM) due to combined dopant gain profiles.
- Average output power of 376 mW at 85.65 MHz in mode-locked operation.
- Continuous-wave power scaling up to 1.01 W at 2080.6 nm with 32.0% slope efficiency.
Conclusions:
- The Tm,Ho:CALGO laser, mode-locked by a SESAM, is capable of producing ultrashort pulses and high CW output power.
- The combined gain of Tm and Ho ions in CALGO is effective for generating broadband emission.
- Spectroscopic analysis provides insights into the observed laser performance, highlighting the potential of this laser system.
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