Pulse shortening in synchronously-pumped mode-locked Yb-fiber lasers

We report on theoretical and experimental study of pulsed lasing driven by synchronous pumping of an Yb-fiber laser. We show that even simple sine-wave modulation of the pump power with moderate depth (~50%) can result in shaping of a regular train of discrete laser pulses. Moreover, generated pulse...

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Bibliographic Details
Main Authors: Nyushkov, B. N., Smirnov, S. V., Ivanenko, A. V., Trashkeev, S. I., Kolker, D. B., Kobtsev, S. M.
Format: Conference Proceeding
Language:English
Subjects:
fiber laser
pulse shaping
synchronous pumping
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Summary:We report on theoretical and experimental study of pulsed lasing driven by synchronous pumping of an Yb-fiber laser. We show that even simple sine-wave modulation of the pump power with moderate depth (~50%) can result in shaping of a regular train of discrete laser pulses. Moreover, generated pulses are typically much shorter than pumping pulses. The pulse shortening factor rises with the modulation depth of pumping. It reached 5 in our setup. Thus, ~200-ns laser pulses were generated with sub-MHz sine-wave modulation of the pump power. Theoretical modelling predicts possibility of further pulse shortening (up to a factor of 11) by increasing maximal pump power and modulation index. Such shortening can be attributed to self-induced gain discrimination of the temporal pulse profile.
ISSN:2642-5580
DOI:10.1109/ICLO48556.2020.9285861