C. Mourikis, G. Blume, K. Paschke, and G. Tränkle

Published in:

Appl. Opt., vol. 64, no. 18, pp. 4969-4974 (2025).

Abstract:

This paper presents single frequency emission at 253.7 nm using a miniaturized diode laser module at 761.1 nm together with a Mg:LiTaO₃ crystal and a LaBGeO₅ crystal in a single-pass configuration. The 761.1 nm pump laser consists of a MOPA with two tapered amplifiers whose emission is coherently combined to generate 5 W in a miniaturized diode laser module. From the pump beam, 1.1 W passes a periodically poled waveguide crystal of stoichiometric LiTaO₃ doped with MgO. The crystal produces a second harmonic beam with an optical power of 18 mW at 380.55 nm achieving a normalized conversion efficiency of 1.6 %/W. Both collinear beams are then used for single-pass sum frequency generation in a periodically poled LaBGeO₅ bulk crystal. Thus, an optical power of up to 5 µW at 253.7 nm was generated with a normalized conversion efficiency of 0.03 %/W. The concept has great potential for a compact UVC laser in the near future.

Topics:

Diode lasers, Distributed feedback lasers, Laser pumping, Nonlinear optical crystals, Sum frequency generation, Tunable diode lasers

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