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Continuous-wave VECSEL Raman laser with tunable lime-yellow-orange output.
Jipeng Lin1, Helen M Pask, David J Spence
1MQ Photonics, Department of Physics and Astronomy, Macquarie University, Sydney, New South Wales 2109, Australia. jipeng.lin@mq.edu.au
Optics Express
|March 16, 2012
Summary
We developed a compact KGW Raman laser using intracavity nonlinear mixing, achieving tunable visible emissions via sum-frequency-generation (SFG) and second-harmonic-generation (SHG). This VECSEL-pumped laser demonstrates potential for expanded spectral coverage.
Area of Science:
- Laser physics
- Nonlinear optics
- Solid-state lasers
Background:
- Vertical-External-Cavity Surface-Emitting Lasers (VECSELs) offer tunable, high-power output.
- Raman lasers provide wavelength conversion, but compact, tunable visible sources are desirable.
- Intracavity nonlinear frequency conversion is a promising technique for generating new wavelengths.
Purpose of the Study:
- To demonstrate a compact, tunable CW KGW Raman laser.
- To achieve visible light generation through intracavity nonlinear mixing.
- To expand the spectral coverage of VECSEL-based systems.
Main Methods:
- A VECSEL was used to pump a compact KGW Raman laser cavity.
- Intracavity nonlinear mixing was achieved using a temperature-tuned Lithium Triborate (LBO) crystal.
- Sum-frequency-generation (SFG) and second-harmonic-generation (SHG) were employed for wavelength conversion.
Main Results:
- Two tunable emission bands were obtained: 548.5–566 nm (SFG) and 577.5–596 nm (SHG).
- Maximum output powers of 0.8 W (SFG at 560 nm) and 0.52 W (SHG at 592.5 nm) were achieved.
- Diode-to-visible optical conversion efficiencies reached 4.2% (SFG) and 2.9% (SHG).
Conclusions:
- The developed laser is a compact and efficient source of tunable visible light.
- Intracavity nonlinear mixing in a VECSEL-pumped Raman laser is effective for spectral expansion.
- This approach shows strong potential for VECSEL-based tunable visible laser systems.
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