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12-ps megawatt peak power pulses out of a single laser oscillator with nonlinear pulse compression
Author(s): Hagen Kohl; Gabor Kulcsar; Daniel Kopf; Bernd Braun
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Paper Abstract

We present a passively Q-switched Nd3+:YAG/Cr4+:YAG laser with subsequent nonlinear pulse compression. This miniature laser combines both the high pulse energy of several tens of micro Joules and the short pulse duration of <20 ps without any amplification. It is therefore readily usable for many ultrafast applications including micro machining and medical applications. With these parameters, the laser shows a new level of compactness in comparison to other sub-100 picosecond laser sources. We utilize a Nd3+:YAG and a Cr4+:YAG crystal in a flat-Brewster, Brewsterflat configuration, respectively, positioned closely and the Brewster faces adjacent to each other. Pumped with approx. 6W from a fiber-coupled, 808 nm laser diode, the miniature, passively Q-switched laser oscillator delivers a pulse energy of 54 μJ with a pulse width of 339 ps and a repetition rate of 8.5 kHz. These pulses are subsequently coupled into a 20 μm core dia. large mode area PM fiber. Following a fiber propagation of 1.65 m the pulses are spectrally broadened by about a factor 40 due to self-phase modulation. Thereafter the nearly linearly chirped laser pulses are compressed by a chirped volume Bragg grating (CVBG). The optimized laser output pulses have a pulse width of 11.8 ps and a pulse energy of 20 μJ. We measured the polarized (PER<20dB) beam quality to be close to the diffraction limit with an M2≈1.5. A 13 hours continuous, stable laser operation has indicated a good long term stability and reliability.

Paper Details

Date Published: 7 March 2019
PDF: 7 pages
Proc. SPIE 10896, Solid State Lasers XXVIII: Technology and Devices, 108960K (7 March 2019); doi: 10.1117/12.2509978
Show Author Affiliations
Hagen Kohl, Technische Hochschule Nürnberg Georg Simon Ohm (Germany)
MONTFORT Laser GmbH (Austria)
Gabor Kulcsar, MONTFORT Laser GmbH (Austria)
Daniel Kopf, MONTFORT Laser GmbH (Austria)
Bernd Braun, Technische Hochschule Nürnberg Georg Simon Ohm (Germany)

Published in SPIE Proceedings Vol. 10896:
Solid State Lasers XXVIII: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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