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Passive optimization of pump noise transfer function by narrow band-pass filtering in femtosecond fiber lasers
摘要： Fluctuation of pump power is one of the major sources of temporal and intensity noise in femtosecond ?ber lasers. In this work, the transfer functions between the relative intensity noise (RIN) of the pump laser diode (LD) and the output RIN, between the RIN of the pump LD and timing jitter of femtosecond ?ber lasers are systematically studied. It is demonstrated, for the ?rst time to our knowledge, that the amplitude of the pump RIN transfer function can be effectively decreased by an intra-cavity narrow band-pass ?lter. In particular, for normal-dispersion lasers, the 3-dB bandwidth of the transfer function can also be narrowed by two-thirds, with a steeper falling edge. Furthermore, with the narrow band-pass ?ltering, the transfer function is almost independent of the net intra-cavity dispersion due to ampli?er similariton formation. The proposed scheme can effectively isolate the pump-induced noise without the need of complex active pump LD control and intra-cavity dispersion management, thus providing an easy way for practical high-power, high-stability femtosecond ?ber laser design and related high-precision applications outside the laboratory.
关键词： transfer function,band-pass ?lter,femtosecond ?ber lasers
更新于2025-09-11 14:15:04
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All-Fiber Dual-Wavelength Mode-Locked Laser Using a Bend-Induced-Birefringence Lyot-Filter as Gain-Tilt Equalizer
摘要： Multi-wavelength ?ber lasers have emerged as a promising light source for the application in wavelength division multiplexing communication, terahertz wave generation and optical sensing due to high ef?ciency and robustness. Lyot-?lter emerges as a potential device for multi-wavelength generation application. However, because of the high birefringence of polarization maintaining ?ber in Lyot-?lter, it is dif?cult to generate broadband dual-wavelength or multi-wavelength mode-locked ?ber laser by using common Lyot-?lter. In this paper, for the ?rst time, we propose an idea of using the low birefringence induced by bending the single-mode ?ber to form a Lyot-?lter for dual-wavelength mode-locked ?ber laser generation. The dual-wavelength output centers at 1532 and 1556 nm and it may simplify the set-up for dual-wavelength mode-locked laser.
关键词： ?ber lasers.,Mode-locked laser
更新于2025-09-11 14:15:04