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Electro-optic harmonic conversion switch for large-aperture multipass laser systems.

M A Henesian, J Goldhar, R A Haas

|September 2, 2009

Summary

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We demonstrated electro-optically tuned second-harmonic generation using potassium dihydrogen phosphate (KDP) crystals. This method, requiring +/-52 kV, efficiently converts 1.064-microm beams to 0.53/microm, showing promise for laser systems.

Area of Science:

Nonlinear Optics
Laser Technology
Plasma Physics

Background:

Second-harmonic generation (SHG) is crucial for frequency conversion in lasers.
Existing tuning methods can be complex or limited in aperture.
Plasma-based electrodes offer novel switching capabilities.

Purpose of the Study:

To demonstrate electro-optically tuned SHG using KDP within a plasma-electrode discharge cell.
To investigate the feasibility of using plasma electrodes for optical switching.
To assess the voltage requirements for efficient harmonic generation.

Main Methods:

Utilized Type I potassium dihydrogen phosphate (KDP) crystals.
Employed a plasma-electrode discharge cell for optical switching.

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Applied an axial voltage of +/-52 kV to tune the SHG process.

Converted a 1.064-micrometer (microm) laser beam to 0.53/microm.

Main Results:

Successfully demonstrated electro-optically tuned SHG with KDP.
Achieved efficient beam conversion at +/-52 kV, consistent with theoretical predictions.
Validated the use of plasma electrodes for optical switching applications.

Conclusions:

Electro-optically tuned SHG in KDP is feasible within a plasma-electrode cell.
The developed system shows potential for creating large-aperture optical switches.
This technique could enhance multipass laser systems requiring precise frequency control.