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Proceedings Paper

Green picosecond narrow-linewidth tapered fiber laser system
Author(s): V. Ustimchik; A. Fedotov; J. Rissanen; T. Noronen; R. Gumenyuk; Yu. Chamorovskii; V. Filippov
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Paper Abstract

We present a single-mode narrow band linear-polarized picosecond green fiber source delivered up to 146.4 kW of peak power. The laser architecture is composed of frequency-doubled all-fiber MOPA system operating at 1064 nm. The commercially available gain-switched semiconductor laser diode was used as a seed source delivered 77 ps pulses with the repetition rate between 100 kHz - 80 MHz. Two stages of pre-amplifiers based on the single-mode Yb-doped fibers were designed to amplify microwatt pulsed signal up to milliwatt level. A high-power amplification cascade comprised a double-clad polarization-maintaining tapered Yb3+-doped fiber as a gain medium. The frequency doubling was realized in a single-pass scheme with LBO crystal. The MOPA design with the active tapered fiber enabled to amplify effectively a narrowband picosecond IR radiation with relatively small spectral broadening. We obtained stable laser radiation with 77 ps pulses at repetition rate of 1 MHz, 290 pm spectral bandwidth with a central wavelength of 532 nm, the average power of 12 W corresponding to 12 μJ of pulse energy and 146.4 kW of peak power. The overall efficiency of secondharmonic generation reached 37 % in a single pass scheme. The obtained results showed advantages of the MOPA system based on a tapered amplifier in comparison with already published picosecond green laser systems exploited standard amplifiers based on cylindrical fixed-core fibers. The single-mode green laser with high peak power and narrow line are in high demand for a wide range of Raman spectroscopy applications.

Paper Details

Date Published: 21 February 2020
PDF: 6 pages
Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 112601Y (21 February 2020); doi: 10.1117/12.2546003
Show Author Affiliations
V. Ustimchik, Ampliconyx Oy (Finland)
A. Fedotov, Tampere Univ. (Finland)
J. Rissanen, Ampliconyx Oy (Finland)
Tampere Univ. (Finland)
T. Noronen, Ampliconyx Oy (Finland)
R. Gumenyuk, Tampere Univ. (Finland)
Yu. Chamorovskii, Kotelnikov Institute of Radio Engineering and Electronics (Russian Federation)
V. Filippov, Ampliconyx Oy (Finland)

Published in SPIE Proceedings Vol. 11260:
Fiber Lasers XVII: Technology and Systems
Liang Dong, Editor(s)

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