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Dual-wavelength synchronously mode-locked Nd:CNGG laser
1School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. gqxie@ntu.edu.sg
Optics Letters
|August 19, 2008
Summary
We demonstrated a dual-wavelength laser using a semiconductor saturable absorber mirror. This laser simultaneously mode-locked two Nd:CNGG crystal gain bands, producing 5 ps pulses.
Area of Science:
- Laser physics
- Materials science
Background:
- Neodymium-doped crystals are crucial for laser development.
- Semiconductor saturable absorber mirrors (SESAMs) enable pulsed laser operation.
Purpose of the Study:
- To experimentally demonstrate a dual-wavelength synchronously mode-locked laser.
- To investigate simultaneous mode-locking on two Nd:CNGG gain bands.
Main Methods:
- Utilized a semiconductor saturable absorber mirror (SESAM) technique.
- Employed a dual-wavelength synchronously mode-locked Nd:CNGG laser setup.
Main Results:
- Achieved simultaneous mode locking on two Nd:CNGG gain bands with 2.4 nm separation.
- Generated a fundamental mode-locked pulse train (88 MHz, 5 ps, 90 mW average power).
- Observed quasi-periodic beat pulses (660 fs width, 0.63 THz repetition rate) within mode-locked pulses.
Conclusions:
- The Nd:CNGG laser successfully achieved dual-wavelength synchronous mode locking.
- The SESAM technique is effective for multi-band mode locking in Nd:CNGG lasers.
- The results offer potential for applications requiring dual-wavelength ultrashort pulses.
