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Kerr-lens mode-locked Yb:KLuW thin-disk laser.

Shotaro Kitajima, Norihiko Nishizawa

|August 13, 2025

Summary

This study introduces the first Kerr-lens mode-locked thin-disk laser using Ytterbium-doped Potassium Lithium Tungstate (Yb:KLuW) crystals. The novel laser design achieves ultrashort pulses with high output power, overcoming challenges of anisotropic laser media.

Area of Science:

Laser physics
Materials science
Optoelectronics

Background:

Ytterbium-doped potassium-based tungstate (Yb:KREW) crystals are promising for ultrashort pulse lasers due to broad bandwidth and high gain.
The anisotropic and biaxial nature of Yb:KREW crystals presents challenges for thin-disk laser applications.

Purpose of the Study:

To demonstrate the first Kerr-lens mode-locked thin-disk laser utilizing Ytterbium-doped Potassium Lithium Tungstate (Yb:KLuW).
To overcome the challenges associated with anisotropic laser media in a thin-disk configuration.

Main Methods:

Utilized a thin Yb:KLuW gain medium.
Implemented low thermal resistance bonding.
Employed Kerr-lens mode-locking technique.
Configured a thin-disk laser setup.

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Main Results:

Achieved a pulse duration of 48.0 fs with a spectral width of 24.1 nm at 1026.0 nm.
Obtained an average output power of 0.425 W in mode-locked operation.
Reached 3.3 W output power with 59.8 fs pulses by adjusting output coupling.
Demonstrated multimode continuous-wave (CW) operation yielding 138 W output power with 62% slope efficiency.

Conclusions:

Successfully demonstrated a novel Kerr-lens mode-locked thin-disk laser based on Yb:KLuW.
The thin-disk configuration with optimized parameters enables efficient generation of ultrashort pulses and high CW output power.
This work paves the way for advanced laser applications requiring high-power, ultrashort pulse generation from anisotropic gain media.