| Autor: |
Valery Filippov, Andrei Fedotov, Vasilii Ustimchik, Regina Gumenyuk, Teppo Noronen, Yuri Chamorovskii, Joona Rissanen |
| Přispěvatelé: |
Dong, Liang, Tampere University, Physics, Computing Sciences, Research group: Nanophotonics |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Fiber Lasers XVII: Technology and Systems. |
| DOI: |
10.1117/12.2546003 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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