Sellmeier and thermo-optic dispersion formulas for LiInS(2)

Area of Science:

• Nonlinear Optics
• Materials Science
• Crystallography

Background:

• Lithium Indium Disulfide (LiInS2) is a nonlinear optical crystal.
• Accurate dispersion relations are crucial for optimizing frequency conversion processes.
• Existing formulas may not fully capture temperature-dependent behavior.

Purpose of the Study:

• To develop improved Sellmeier and thermo-optic dispersion formulas for LiInS2.
• To accurately model temperature-dependent phase-matching conditions.
• To enhance the predictability of nonlinear optical processes in LiInS2.

Main Methods:

• Derivation of new Sellmeier equations.
• Development of thermo-optic dispersion formulas.
• Experimental validation of phase-matching conditions.

Main Results:

• The proposed formulas provide excellent reproduction of experimental phase-matching data.
• Accurate predictions for second, sum, and difference-frequency generation were achieved.
• The formulas cover a broad spectral range from 1.0642 to 10.5910 μm.

Conclusions:

• The improved dispersion formulas enhance the utility of LiInS2 for nonlinear optics.
• Precise phase-matching control is now more achievable for various frequency generation applications.
• This work facilitates the design of optical devices utilizing LiInS2 crystals.