Efficient 640  nm actively Q-switched Pr:YLF laser.

Authors

Remi Garot-Jacquey, Lauren Guillemot, Remi Soulard, Gabriel Mennerat, Pavel Loiko, Patrice Camy

Published in

Applied optics. Volume 65. Issue 23. Pages 7777-7782. Aug 10, 2026.

Abstract

An electro-optical (EO) Q-switched laser at 640 nm in Pr³⁺:LiYF₄ (Pr:YLF) is achieved in a compact plane-parallel cavity design. An intracavity lens enables a tightly focused mode within the praseodymium-doped crystal while maintaining a collimated beam in the EO modulator. This configuration is expected to reduce astigmatism and depolarization losses. Under Q-switching laser operation, the system delivers a single-pulse energy of 28.9 µJ with a pulse duration of 47.5 ns at a repetition rate of 5 kHz. When operated at 20 kHz, the laser produces an average power of 380 mW, corresponding to a slope efficiency of 21.2%, demonstrating efficient energy extraction from the Pr:YLF gain medium under EO modulation. To the best of our knowledge, this result represents the highest slope efficiency reported for an EO Q-switched visible Pr:YLF laser.

PMID:
42593447
Bibliographic data and abstract were imported from PubMed on 13 Aug 2026.

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