We report an injection-locked single-frequency fiber laser with widely tunable repetition rate. A distributed Bragg reflection (DBR) fiber laser with a central wavelength of 1.063μm and a single frequency continuous-wave (CW) output is used as the master laser. A Fabry–Pérot (F-P) laser diode (LD) with wavelength range of 1.050μm to 1.067μm is used as the slave laser. The single-frequency pulsed laser output is achieved at 1.063μm by controlling pulse, amplitude, temperature of F-P LD and adjusting injection power of DBR fiber laser. The pulse duration can be adjusted between 0.6ns and 40ns. The repetition rate of the laser output can be tuned between 100kHz and 2MHz by tuning the electronic trigger signal. The linewidth is 14MHz when pulse duration is 11ns with repetition rate of 100kHz. The laser with local-oscillator (LO) output shows important value for the applications in the field of coherent LIDAR (Light Detection And Ranging).
Frequency-sweeping lasers have drawn considerable attentions, especially in FMCW LIDAR. The frequency sweeping single-frequency PM fiber laser is respectively realized by piezoelectric (PZT) modulation and pump modulation, which using the same Er-doped distributed Bragg reflection (DBR) fiber cavity. The central wavelength is 1552.49 nm with the extinction ratio of above 20 dB. The frequency sweeping range of PZT modulation is seen to be up to 745 MHz under the modulation repetition rate of 1Hz, and the modulation repetition rate of the pump can be tuned from 1Hz to 20 kHz. However, the frequency sweeping range and tunable range of pump modulation is 635 MHz and from 1Hz to 10 kHz, respectively. Comparing with both methods, the PZT modulation has wider sweeping range and tunable range, however, the mechanical resonance will be occurred. The pump modulation indicates virtually linearly frequency modulation. Future works to achieve more characteristic of two modulation methods are undergoing.
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