Abstract

We report the passively $Q$-switched (PQS) operation in the near infrared (NIR) regime with as-prepared zeolitic imidazolate framework-67 (ZIF-67) as saturable absorbers (SAs) for the first time, to the best of our knowledge. Based on the excellent saturable absorption properties of the as-prepared ZIF-67, passively $Q$-switched Nd:GdVO₄ lasers were achieved operating at $^4{{\rm F}_{3/2}} \to {^2}{{\rm I}_{11/2}}$ and $^4{{\rm F}_{3/2\:}} \to {^2}{{\rm I}_{13/2}}$ transitions. The stable $Q$-switched laser’s pulses with a pulse width of 120 ns at a repetition rate of 566 kHz and a pulse width of 108 ns at a repetition rate of 415 kHz were obtained, corresponding to the transition $^4{{\rm F}_{3/2}} \to {^2}{{\rm I}_{11/2}}$ at 1 µm and the transition $^4{{\rm F}_{3/2\:}} \to {^2}{{\rm I}_{13/2}}$ at 1.3 µm, respectively. The results indicate that the ZIF-67 saturable absorber with the advantages of large modulation depth and high thermal stability is a promising saturable absorber candidate for the NIR pulse generation.

© 2019 Optical Society of America

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