상세정보
학술지
Graphene Mode-locked Femtosecond Cr2+:ZnS Laser with ~300 nm Tuning Range
- 발행일
- 201609
- 출처
- Optics Express, v.24 no.18, pp.20774-20780
- ISSN
- 1094-4087
- 출판사
- Optical Society of America(OSA)
- 초록
- 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 제안 키워드
- 20 nm, Mid-IR lasers, Mid-infrared(MIR), Mode-locked, Monolayer graphene, Passive mode-locking(PML), Pulse energy, Pump-probe technique, Saturable Absorber, Transmission-type, Tunable sources