A Q-switched Yb:KGW solid-state laser using topological insulator Bi 2 Se 3 as a saturable absorber was demonstrated experimentally for the first time. The Bi 2 Se 3 saturable absorber was fabricated in a film on a highly reflective mirror. By inserting this into a Yb:KGW laser, the Q-switched operation was obtained. The highest average output power was 439.4 mW and the corresponding repetition rate, pulse width and pulse energy were 166.7 kHz, 1.6 μ s and 2.64 μ J, respectively. To our knowledge, this is the highest output power among topological insulator-modulated lasers with topological insulator absorbers.
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Hu et al. (2014) studied this question.
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