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Femtosecond KCl:Li and RbCl:Li color-center lasers near 2.8 microm with a HgCdTe multiple-quantum-well saturable
Optics Letters
|September 23, 2009
Summary
We generated ultrashort mid-infrared pulses using semiconductor saturable absorbers. This breakthrough offers the shortest pulses in this wavelength range, enabling new applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Passive mode-locking is crucial for generating ultrashort laser pulses.
- Semiconductor saturable absorbers offer tunable properties for mode-locking applications.
Purpose of the Study:
- To achieve passive mode-locking of color-center lasers using HgCdTe multiple-quantum-well saturable absorbers.
- To generate ultrashort, pedestal-free pulses in the mid-infrared region.
Main Methods:
- Utilized mercury cadmium telluride (HgCdTe) multiple-quantum-well structures as saturable absorbers.
- Passively mode-locked potassium chloride:lithium (KCl:Li) and rubidium chloride:lithium (RbCl:Li) color-center lasers.
Main Results:
- Generated pedestal-free pulses as short as 120 femtoseconds (fsec).
- Achieved pulse generation near 2.8 micrometers (µm) in the mid-infrared region.
- Demonstrated the shortest pulses reported in this wavelength range.
Conclusions:
- The study successfully generalized the semiconductor passive mode-locking technique to new wavelength ranges and laser systems.
- Results support a model where longitudinal optical (LO) phonon collisions govern fast saturable absorber behavior.
- This work establishes a direct source for subpicosecond pulses in the mid-infrared spectrum.
