Multiwatt red nanosecond frequency-doubled Raman-shifted fiber laser

Timothy H. Runcorn; Robert T. Murray; J. Roy Taylor

doi:10.1117/12.3001024

12 March 2024 Multiwatt red nanosecond frequency-doubled Raman-shifted fiber laser

Timothy H. Runcorn, Robert T. Murray, J. Roy Taylor

Proceedings Volume 12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; 128690K (2024) https://doi.org/10.1117/12.3001024
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We present a nanosecond-pulsed 655 nm laser source based on frequency-doubling a Raman-shifted fiber laser. At a repetition rate of 1.5 MHz, the source generates an average power of 3.3 W, corresponding to a pulse energy of 2.2 μJ, with a pulse duration of 1.8 ns. The fundamental Raman-shifted fiber laser operating at 1310 nm has a novel configuration where the first Raman shift is performed in an Yb-doped fiber amplifier and the second Raman shift is performed in a phosphosilicate fiber. Both Raman shifting stages are seeded with narrow linewidth CW signals, enabling the temporal properties of an amplified 1064 nm modulated laser diode to be transferred to narrow-band light at 1310 nm with very high conversion efficiency. The resulting micro-Joule-level, nanosecond pulses at 1310 nm are frequency-doubled to 655 nm in a double LBO crystal setup with a conversion efficiency of 51%. The multi-Watt, micro-Joule-level red pulses have near diffraction limited beam quality (M² ≤ 1.04), making this source ideally suited to biomedical imaging applications such as super-resolution and photoacoustic microscopy.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Timothy H. Runcorn, Robert T. Murray, and J. Roy Taylor "Multiwatt red nanosecond frequency-doubled Raman-shifted fiber laser", Proc. SPIE 12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, 128690K (12 March 2024); https://doi.org/10.1117/12.3001024

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