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Ho:KY(WO4)2 thin-disk laser passively Q-switched by a GaSb-based SESAM
Optics Express
|May 3, 2018
Summary
This study presents a novel Holmium laser, achieving 551 mW output power at 2056 nm. The laser demonstrates high efficiency and excellent pulse characteristics for advanced applications.
Area of Science:
- Lasers and Photonics
- Materials Science
- Solid-State Physics
Background:
- Holmium (Ho) lasers are crucial for various applications, including medical and industrial uses.
- Developing efficient and compact Ho laser systems remains an active research area.
- Epitaxial growth techniques offer precise control over laser material properties.
Purpose of the Study:
- To develop and characterize a novel Holmium thin-disk laser.
- To investigate the performance of Ho:KY(WO4)2 / KY(WO4)2 epitaxy in a laser system.
- To achieve efficient Q-switched operation using a semiconductor saturable absorber mirror.
Main Methods:
- Fabrication of a Holmium thin-disk laser using 3 at.% Ho:KY(WO4)2 / KY(WO4)2 epitaxy.
- Single-bounce pumping configuration utilizing a 1960 nm Thulium (Tm)-fiber laser.
- Passive Q-switching employing a Gallium Antimonide (GaSb)-based quantum-well semiconductor saturable absorber mirror (SESAM).
Main Results:
- The laser generated an average output power of 551 mW at a wavelength of 2056 nm.
- A high slope efficiency of 44% was achieved with respect to absorbed pump power.
- Optimal pulse characteristics included an energy of 4.1 μJ, duration of 201 ns, and repetition rate of 135 kHz.
- A remarkable conversion efficiency of 93% was observed compared to the continuous-wave regime.
Conclusions:
- The developed Holmium thin-disk laser demonstrates high performance and efficiency.
- The use of Ho:KY(WO4)2 / KY(WO4)2 epitaxy and Tm-fiber laser pumping is effective for generating 2-μm radiation.
- The results highlight the potential of this laser system for demanding applications requiring pulsed 2-μm emission.
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