Nanosecond pulsed single-frequency two-stage holmium-doped fiber MOPA at 2054 nm and 2090 nm

A single-frequency polarization-maintaining holmium-doped fiber master oscillator power amplifier operating at signal wavelengths of 2054 n m and 2090 n m is presented. The two-stage setup delivers up to 240 W peak power and 6.7 µ J pulse energy for a pulse width of 30.2 n s at a repetition rate of...

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Bibliographic Details
Published in:Applied optics (2004) 2021-08, Vol.60 (22), p.F27
Main Authors: Lorenz, Dominik, Romano, Clément, Eichhorn, Marc, Kieleck, Christelle
Format: Article
Language:English
Subjects:
Amplification
Amplifier design
Doped fibers
High gain
Holmium
Nanosecond pulses
Power amplifiers
Pulse duration
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Summary:A single-frequency polarization-maintaining holmium-doped fiber master oscillator power amplifier operating at signal wavelengths of 2054 n m and 2090 n m is presented. The two-stage setup delivers up to 240 W peak power and 6.7 µ J pulse energy for a pulse width of 30.2 n s at a repetition rate of 100 k H z . The first amplifier stage is designed by simulation, tailored for high gain at the signal wavelength range, favoring amplification at 2090 n m . The design is discussed, and the measured values are compared with the simulation. The second stage is investigated regarding the efficiency for co- and counter-pumping. Stimulated Brillouin scattering was found to be the limiting factor for pulse peak power scaling in the second stage. The measured output pulse shapes are discussed and compared to pulse shapes derived with the Frantz–Nodvik model.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.424061