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Journal Article
Graphene mode-locked femtosecond Cr^2+:ZnS laser with ~300 nm tuning range
- Authors
- Won Bae Cho, Sun Young Choi, Chunhui Zhu, Mi Hye Kim, Jun Wan Kim, Jin Sun Kim, Hyung Ju Park, Dong Ho Shin, Moon Youn Jung, Fengqiu Wang, Fabian Rotermund
- Issue Date
- 2016-09
- Citation
- Optics Express, v.24, no.18, pp.20774-20780
- ISSN
- 1094-4087
- Publisher
- Optical Society of America(OSA)
- Language
- English
- Type
- Journal Article
- Abstract
- Graphene has proved to be an excellent broadband saturable absorber for mode-locked operation of ultrafast lasers. However, for the mid-infrared (mid-IR) range where broadly tunable sources are in great needs, graphene-based broadly tunable ultrafast mid-IR lasers have not been demonstrated so far. Here, we report on passive mode-locking of a mid-IR Cr:ZnS laser by utilizing a transmission-type monolayer graphene saturable absorber and broad spectral tunability between 2120 nm and 2408 nm, which is the broadest tuning bandwidth ever reported for graphene mode-locked mid-IR solid-state lasers. The recovery time of the saturable absorber is measured to be ~2.4 ps by pump-probe technique at a wavelength of 2350 nm. Stably mode-locked Cr:ZnS laser delivers Fourier transform-limited 220-fs pulses with a pulse energy of up to 7.8 nJ.
- KSP Keywords
- 20 nm, Mid-IR lasers, Mid-infrared(MIR), Mode-locked, Monolayer graphene, Passive mode-locking(PML), Pulse energy, Pump-probe technique, Transmission-type, Tunable sources, Tuning Range
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
