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Room-temperature 1.06-0.53-microm second-harmonic generation with MgO:LiNbO(3).

J Q Yao, W Q Shi, J E Millerd

|September 23, 2009

Summary

High efficiency second-harmonic generation (SHG) was achieved at room temperature using MgO-doped Lithium Niobate (LiNbO3). This crystal shows promising performance compared to KTP and LBO for laser applications.

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Area of Science:

Nonlinear Optics
Materials Science

Background:

Second-harmonic generation (SHG) is crucial for frequency conversion in lasers.
Lithium Niobate (LiNbO3) is a well-established nonlinear optical material.
Doping LiNbO3 with Magnesium Oxide (MgO) can enhance its nonlinear properties.

Purpose of the Study:

To investigate room-temperature SHG performance of 7 mol.% MgO-doped LiNbO3.
To compare MgO:LiNbO3 with other nonlinear crystals like KTP and LBO.
To determine phase-matching parameters for MgO:LiNbO3.

Main Methods:

Angle-tuned phase matching was employed for SHG.
A 12-mm-long MgO:LiNbO3 crystal was used.
Experimental Sellmeier equations were determined for calculations.

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Main Results:

A 45% SHG conversion efficiency was achieved at room temperature.
This was obtained with a fundamental peak-power density of 140 MW/cm^2.
Noncritical phase-matched Type I SHG was identified at 1.053 microm.

Conclusions:

MgO:LiNbO3 offers high SHG efficiency at room temperature.
It is a competitive material compared to KTP and LBO.
It is suitable for use with Nd:YLF lasers operating at 1.053 microm.