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Yb-fiber-laser-based, 1.8 W average power, picosecond ultraviolet source at 266 nm.

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|September 23, 2015

Summary

We developed a compact picosecond ultraviolet (UV) laser source at 266 nm. This high-power UV laser utilizes efficient fourth-harmonic generation for advanced applications.

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Area of Science:

Laser physics
Nonlinear optics
Solid-state lasers

Background:

Picosecond ultraviolet (UV) lasers are crucial for various scientific and industrial applications.
Generating high-power UV radiation at megahertz repetition rates remains a challenge.

Purpose of the Study:

To report a compact, stable, high-power picosecond UV source at 266 nm.
To demonstrate efficient two-step fourth-harmonic generation (FHG) from a mode-locked Yb-fiber laser.

Main Methods:

Utilized single-pass second-harmonic generation (SHG) in a lithium triborate (LBO) crystal to produce green light at 532 nm.
Employed single-pass FHG in beta-barium borate (BBO) crystal to convert green light to UV at 266 nm.
Optimized focusing conditions to mitigate spatial walk-off effects.

Main Results:

Achieved up to 9.1 W of average green power at 532 nm with 54% conversion efficiency.
Generated up to 1.8 W of average UV power at 266 nm with an overall FHG conversion efficiency of approximately 11%.
Demonstrated passive power stability better than 0.5% rms (16 h) for green output and 4.6% rms (1.5 h) for UV output, with high beam quality (TEM00 mode).

Conclusions:

Successfully demonstrated a compact and stable picosecond UV source at 266 nm operating at megahertz repetition rates.
This work represents the first report of picosecond UV generation at 266 nm at megahertz repetition rates.
The developed source offers a promising tool for applications requiring high-power, short-pulse UV radiation.