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Dispersion-flattened femtosecond mid-IR Cr:ZnS laser with a passive optical switch based on graphene–ZnSe
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- Authors
- Won Bae Cho
- Issue Date
- 2023-10
- Citation
- Journal of the Korean Physical Society, v.83, no.7, pp.537-544
- ISSN
- 0374-4884
- Publisher
- 한국물리학회
- Language
- English
- Type
- Journal Article
- Abstract
- In this study, we report a graphene–ZnSe mode-locked Cr:ZnS laser with flattened group delay dispersion (GDD) spectra. The main achievement is successfully reducing the pulse duration by only controlling the intracavity dispersion profiles to be flat. Prior to flattening the dispersion profiles, the graphene–ZnSe mode-locked laser generates relatively long 137 fs pulses with an output power of 650 mW. To attain a relatively flattened intracavity dispersion profile, we exchanged the cavity mirrors while maintaining a consistent dispersion amount at the center wavelength both before and after the profile adjustment. Following the mirror exchange, the pulse duration significantly decreased to 104 fs, while the output power remained similar at 645 mW. Furthermore, at higher pump power levels, the laser with the flattened dispersion profile produces weakly chirped pulses as short as 102 fs, centered around 2350 nm, with average output powers up to 675 mW. To the best of our knowledge, this is the first demonstration of pulse width reduction by manipulating only the dispersion profile in this mid-infrared spectral region.
- KSP Keywords
- Center wavelength, Chirped pulse, Dispersion-flattened, Flattened dispersion, Group delay dispersion, Mid-IR, Mid-infrared(MIR), Mode-locked laser, Optical switches, Output power, Power Levels