Abstract
MgO-doped congruent Lithium Niobate (MgO:CLN) is widely used in a variety of nonlinear optical processes, while its Sellmeier equation has only been derived from experiments under 200oC. Here we extend the temperature range for the Sellmeier equation study to as wide as 60 oC to 510 oC. This work is important to extend the operation temperature range of MgO:CLN crystal.
Highlights
Lithium Niobate crystal is important as a nonlinear optical crystal because of its large nonlinear optical coefficient and wide transparent wavelength range
With the obtained wavelengths of signal and idler, and the refractive index values from Ref. 17, the coefficients in the Sellmeier equation (4) are derived by minimizing the error function χ2 according to equation (6)
Since the Sellmeier equation of MgO:CLN derived by Ref. 13 is reported to be valid in the spectral range of 0.5-4 μm, which covers our measured spectral range, the wavelength-dependent aj coefficients from that work are set as our calculation base
Summary
Lithium Niobate crystal is important as a nonlinear optical crystal because of its large nonlinear optical coefficient and wide transparent wavelength range. The wavelength and temperature dependent Sellmeier equation is necessary to predict the phase matching geometry and for domain structure design of PPMgOLN crystal. At temperature above 200 oC, it shows a significant improved accuracy in phase matching prediction compared with that of the previously reported Sellmeier equation.13This work provides accurate guidance for the applications of MgO:CLN at high temperatures.
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