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Femtosecond Alexandrite laser passively mode-locked by an InP/InGaP quantum-dot saturable absorber
Optics Letters
|January 13, 2018
Summary
Researchers developed a new femtosecond Alexandrite laser using a quantum-dot semiconductor saturable absorber mirror (QD-SESAM). This novel laser achieves ultrashort pulses, marking a significant advancement in laser technology.
Area of Science:
- Laser Physics
- Quantum Optics
- Materials Science
Background:
- Alexandrite lasers are crucial for various applications requiring specific wavelengths.
- Passively mode-locking is a key technique for generating ultrashort laser pulses.
- Semiconductor saturable absorber mirrors (SESAMs) are effective for mode-locking but advancements are ongoing.
Purpose of the Study:
- To demonstrate a passively mode-locked femtosecond Alexandrite laser.
- To investigate the performance of an Indium Phosphide/Indium Gallium Phosphide (InP/InGaP) quantum-dot SESAM (QD-SESAM) in an Alexandrite laser system.
- To establish a new benchmark for ultrashort pulse generation in Alexandrite lasers.
Main Methods:
- Utilized an Alexandrite laser system.
- Employed an InP/InGaP QD-SESAM for passive mode-locking.
- Pumped the laser at a wavelength of 532 nm.
- Characterized the output pulses for duration and power.
Main Results:
- Successfully achieved passive mode-locking of the Alexandrite laser.
- Generated laser pulses with a duration as short as 380 femtoseconds (fs).
- Obtained an average output power of 295 milliwatts (mW) at a wavelength of 775 nm.
Conclusions:
- This work presents the first demonstration of a passively mode-locked femtosecond Alexandrite laser utilizing any SESAM.
- It is also the first report of using a QD-SESAM for passive mode-locking in such a laser system.
- The results highlight the potential of QD-SESAMs for generating ultrashort pulses in Alexandrite lasers.
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