Wanli Gao, Guanyu Liu, Zhigang Zhang. 44.6 fs pulses from a 257 MHz Er:fiber laser mode-locked by biased NALM[J]. Chinese Optics Letters, 2018, 16(11): 111401
- Chinese Optics Letters
- Vol. 16, Issue 11, 111401 (2018)
Fig. 1. Schematic of the mode-locked fiber laser based on the NALM. HWP, half-wave plate; PBS: polarizing beam splitter; WDM‐Collimator, a combination of a collimator and wavelength division multiplexer; FR, Faraday rotator; HR, high reflection mirror.
Fig. 2. The average output power as a function of pump 2 power. Pump 1 power was fixed to 650 mW.
Fig. 3. Radio frequency spectrum at the resolution bandwidth of 1 kHz.
Fig. 4. Measured spectra of output pulses. The modulation state of the spectra can be changed by rotating the λ / 8
Fig. 5. Fringe-resolved autocorrelation trace of output pulses.
Fig. 6. PICASO retrieved intensity and phase of the output pulse. The retrieved pulse duration is 44.6 fs.
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