Student Broadband pulsed fiber laser for suppression of stimulated Brillouin scatteringWednesday (24.06.2020) 11:53 - 11:56 Room 1
Fiber lasers are powerful tools for using in a variety of medical and industrial applications because of small size, portable, long-term stability, high efficiency, and high beam quality. Especially short pulse fiber lasers have a high peak power. So, these lasers are performing high-quality processing by suppressing heat influence around process part and are used for drilling and marking processes. In recent years, high peak power pulse fiber lasers have been developed in order to shorten processing time and enable to process materials haven’t done ever. However, when output power is increased gradually, stimulated Brillouin scattering (SBS) are caused by coherent and high-brightness light, thus output power is limited. Therefore, it is necessary to suppress SBS by broadening light source wavelength and reducing each spectral power density for getting high peak power light source than ever. In this research, we show high power laser source with master oscillator-power amplifier (MOPA) system by using a part of superluminescent diode (SLD) light, has wide wavelength, was cut out by band pass filter (BPF) as a seed light.
We used the BPF has 3 nm pass region. And acousto-optical modulator (AOM) chopped a part of SLD’s light as a seed light. Output repetition-rate and duty ratio were controlled by AOM with pulse generator (PG). The preamplifier was composed of forward-pumped Erbium doped fiber amplifier (EDFA) with a pump wavelength of 980 nm for low noise amplification. In the same way, the power amplifier was composed of a backward-pumped EDFA with a pump wavelength of 1480 nm for high power output. A BPF was put between the EDFAs for rejecting amplified spontaneous emission (ASE) was generated in the preamplifier.
All pump LD’s outputs have 200 mW and the seed light peak power was about 5 mW. The output light’s pulse width was 16.6 ns and the peak power was calculated 570 W when the repetition rate was 1 kHz. Further, the spectrum width was 2.02 nm.
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|Poster||Broadband pulsed fiber laser for suppression of stimulated Brillouin scattering||we show high power laser source with master oscillator-power amplifier (MOPA) system by using a part of superluminescent diode (SLD) light, has wide wavelength, was cut out by band pass filter (BPF) as a seed light.||169 KB||Download|