Green picosecond narrow-linewidth tapered fiber laser system

V. Ustimchik; A. Fedotov; J. Rissanen; T. Noronen; R. Gumenyuk; Yu. Chamorovskii; V. Filippov

doi:10.1117/12.2546003

21 February 2020 Green picosecond narrow-linewidth tapered fiber laser system

V. Ustimchik, A. Fedotov, J. Rissanen, T. Noronen, R. Gumenyuk, Yu. Chamorovskii, V. Filippov

Proceedings Volume 11260, Fiber Lasers XVII: Technology and Systems; 112601Y (2020) https://doi.org/10.1117/12.2546003
Event: SPIE LASE, 2020, San Francisco, California, United States

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.

Conference Presentation

Citation Download Citation

V. Ustimchik, A. Fedotov, J. Rissanen, T. Noronen, R. Gumenyuk, Yu. Chamorovskii, and V. Filippov "Green picosecond narrow-linewidth tapered fiber laser system", Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 112601Y (21 February 2020); https://doi.org/10.1117/12.2546003

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