A stress-adaptive optical frequency conversion device

Abstract

The invention discloses a stress-adaptive optical frequency conversion device. The device comprises an upper pressing cover, a lower pressing cover, an incident coupling prism, an emergent coupling prism, a nonlinear optical crystal and tension springs, wherein the upper pressing cover and the lower pressing cover are connected through the tension springs, and the tension springs are vertical to an optical glue face between the nonlinear optical crystal and the incident coupling prism and an optical glue face between the nonlinear optical crystal and the emergent coupling prism. The device disclosed by the invention has the advantage that stress, acting on the optical glue faces, resulting from the deformation of all devices during temperature change can be reduced through the expanding and contracting of the tension springs, so that the optical glue faces are not prone to cracking.

Description

technical field [0001] The invention relates to the technical field of optical nonlinear frequency change, and more particularly relates to a stress-adaptive optical frequency conversion device. Background technique [0002] Optical nonlinear frequency conversion is a technical means to extend the laser frequency, which is of great significance to the development of laser technology and the expansion of laser application fields, and will promote the development of some interdisciplinary and some new fields. [0003] Some nonlinear optical crystals (such as potassium fluoroborate beryllium crystal, KBBF for short) cannot be grown in large size due to the layered structure, and cannot be cut according to the phase matching angle, and prism coupling is required to achieve phase matching. At the same time, the high-purity nonlinear optical crystal has a smaller absorption coefficient and a shorter absorption cut-off wavelength at low temperature, which is conducive to higher pow...

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Problems solved by technology

[0004] However, in the existing optical frequency conversion coupling device, the thermal expansion coefficients of the upper gland, the lower gland, the in-coupling prism, the out-coupling prism and the nonlinear optical crystal are different. When the temperature changes, especially in normal temperature assembly and low temperature When in use, the stress generated by each device is likely to cause cracks on the optical glue (ion bonding) surfaces of the nonlinear optical crystal and the in-coupling prism and out-coupling prism, making it impossible to continue to use, and even more serious damage to the crystal

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