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  4. Nanosecond pulsed single-frequency two-stage holmium-doped fiber MOPA at 2054 nm and 2090 nm
 
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2021
Journal Article
Titel

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

Abstract
A single-frequency polarization-maintaining holmium-doped fiber master oscillator power amplifier operating at signal wavelengths of 2054 nm and 2090 nm is presented. The two-stage setup delivers up to 240 W peak power and6.7 µJ pulse energy for a pulse width of 30.2 ns at a repetition rate of 100 kHz. The first amplifier stage is designed by simulation, tailored for high gain at the signal wavelength range, favoring amplification at 2090 nm. 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.
Author(s)
Lorenz, Dominik
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Romano, Clément
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Eichhorn, Marc
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Kieleck, Christelle
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB
Zeitschrift
Applied optics
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DOI
10.1364/AO.424061
Language
English
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