All-solid-state parametric Raman anti-Stokes laser at 508 nm.

Area of Science:

• Optics and Photonics
• Laser Physics
• Materials Science

Background:

• Parametric Raman lasers offer tunable wavelength generation.
• Potassium gadolinium tungstate (KGW) is a promising material for nonlinear optical applications.
• Anti-Stokes Raman scattering enables shorter wavelength generation than the pump source.

Purpose of the Study:

• To demonstrate a compact parametric anti-Stokes Raman laser.
• To investigate the performance of potassium gadolinium tungstate in this configuration.
• To achieve efficient generation of visible anti-Stokes light.

Main Methods:

• Utilized a Q-switched 532 nm laser as the pump source.
• Employed a compact 4.5 cm potassium gadolinium tungstate crystal.
• Incorporated an off-axis Stokes resonator for non-collinear phase matching.

Main Results:

• Generated output chiefly at the first anti-Stokes line at 508 nm.
• Achieved anti-Stokes output energies up to 0.27 mJ.
• Observed a pump conversion efficiency of 0.46% for the first anti-Stokes line.
• Detected second- and third-order anti-Stokes lines at 486 nm and 465 nm.

Conclusions:

• The potassium gadolinium tungstate parametric anti-Stokes Raman laser is a compact and efficient device.
• The off-axis resonator design facilitates non-collinear phase matching for anti-Stokes generation.
• The observed multiple anti-Stokes lines suggest potential for broadband visible light generation.