Jun Wan Kim, Sun Young Choi, Won Tae Kim, Bong Joo Kang, Won Bae Cho, Guang-Hoon Kim, Fabian Rotermund, "550 MHz carbon nanotube mode-locked femtosecond Cr:YAG laser," Chin. Opt. Lett. 16, 061404 (2018)

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- Chinese Optics Letters
- Vol. 16, Issue 6, 061404 (2018)

Fig. 1. Nonlinear reflection measurement of the CNT-SAM at 1.5 μm.

Fig. 2. (a) Schematic and (b) photograph of 550-MHz femtosecond Cr:YAG laser. Cr:YAG: 20-mm-long Cr:YAG gain crystal; M1, M2: HR-coated concave mirrors with ROC = − 50 mm ; CM1: HR-coated concave GTI mirror with ROC = − 100 mm and with one bounce dispersion of − 225 fs 2 ; CM2: HR-coated plane GTI mirror with one bounce dispersion of − 375 fs 2 ; CNT-SAM : carbon nanotube saturable absorber mirror; OC: output coupler with 0.5% or 0.8% transmission.

Fig. 3. Average output power versus incident pump power in the femtosecond mode-locked regime, and beam profile of second harmonic generation of mode-locked pulses (inset).

Fig. 4. Autocorrelation trace (left) and the corresponding laser spectrum (right).

Fig. 5. RF spectra at the fundamental beat note and in a 7.5 GHz span (inset).

Fig. 6. Mode-locked laser spectra measured at different humidity conditions.

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