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Noncritically phase-matched second-harmonic generation in cesium lithium borate.

David C Gerstenberger¹, Thomas M Trautmann, Mark S Bowers

¹Aculight Corporation, Suite 113, 11805 North Creek Parkway South, Bothell, Washington 98011, USA. daveg@aculight.com

|July 30, 2003

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Efficient generation of 236-nm light was achieved using cesium lithium borate for noncritical phase-matched second-harmonic generation. This method offers a significantly higher nonlinear drive compared to beta-barium borate for this specific wavelength.

Area of Science:

Nonlinear Optics
Laser Physics
Materials Science

Background:

Second-harmonic generation (SHG) is crucial for frequency conversion in lasers.
Cesium lithium borate (CLBO) is a nonlinear optical crystal with potential for efficient SHG.
Achieving efficient generation of ultraviolet (UV) light requires optimized nonlinear optical processes.

Purpose of the Study:

To demonstrate efficient generation of 236-nm light.
To investigate the performance of noncritically phase-matched SHG in CLBO for UV generation.
To compare the nonlinear drive of CLBO with beta-barium borate (BBO) for 236-nm generation.

Main Methods:

Utilized noncritically phase-matched second-harmonic generation.
Employed cesium lithium borate as the nonlinear optical crystal.

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Operated at a crystal temperature of -15 degrees C for phase matching.

Main Results:

Achieved efficient generation of 236-nm light.
Noncritical phase matching in CLBO provided approximately 20 times the nonlinear drive compared to BBO for 236-nm generation.
The 236-nm wavelength was generated as the fourth harmonic of a 946-nm Nd:YAG laser.

Conclusions:

Noncritically phase-matched SHG in CLBO is a highly efficient method for generating 236-nm light.
CLBO offers superior nonlinear performance over BBO for this specific UV generation application.
The demonstrated technique provides a viable route for efficient UV light sources.