Journal
IEEE PHOTONICS JOURNAL
Volume 9, Issue 1, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2017.2655003
Keywords
Fiber Lasers; mode-locked laser; ultrafast laser; supercontinuum generation
Funding
- National Key Scientific Instrument Project [2012YQ150092]
- National Natural Science Foundation of China [11404211, 11434005, 11374370]
- Shanghai Municipal Science and Technology Commission [13ZR1458100]
- Hujiang Foundation of China [D15014]
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We demonstrate a broadband all polarization-maintaining Yb-fiber laser system that provides 137-nJ pulse at 140-fs duration. The pulses are generated in a passively mode-locked laser in which the nonlinear amplifying loop mirror acts as the mode locker, an integrated nonreciprocal device biases pi/2 phase shift to reduce the mode locking threshold, and a pair of gratings are involved to force the oscillator operating in its quietest mode. Self-started mode locking is first achieved in multiple-pulse regime with 250-mW pump power, and stable single-pulse operation with 1.1-ps pulse duration, 75-pJ energy, and 29-nm spectral width are obtained subsequently when the pump power is decreased to 135 mW. Being amplified and spectral broadened, the laser pulses lead to an f(ceo) signal with >30-dB signal-to-noise ratio (SNR) which is suitable for frequency comb stabilization.
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