Large aperture uniaxial crystal light absorption coefficient measurement apparatus and method thereof

Abstract

The invention relates to a large aperture uniaxial crystal light absorption coefficient measurement apparatus and a method thereof. A collimating mirror, a polarizer and a semitransparent mirror A are sequentially arranged in the emitting light path of a laser; the semitransparent mirror A makes incident light form reflected light A and transmitted light A; a convergent mirror A is arranged in the path of the reflected light A and converges the reflected light A into a supervision integrating sphere power meter; a semitransparent mirror B is arranged in the path of the transmitted light A and makes the transmitted light A form reflected light B and transmitted light B; a convergent mirror B is arranged in the path of the reflected light B and converges the reflected light B into a supervision CCD; a convergent mirror C is arranged in the path of the reflected light B and converges the reflected light B into a measurement integrating sphere power meter; a large aperture uniaxial crystal to be measured is placed between the semitransparent mirror A and the semitransparent mirror B; and a computer is respectively connected with the large aperture uniaxial crystal to be measured, the supervision integrating sphere power meter, the supervision CCD and the measurement integrating sphere power meter. The apparatus and the method can be used to measure the P light and S light absorption coefficients of the large aperture uniaxial crystal, and guarantee the measurement precision.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a crystal light absorption coefficient measurement device and method thereof, in particular to a method for measuring P light and S light absorption coefficients of large-aperture uniaxial crystals when the optical axis direction of the crystal and the beam propagation direction meet the phase matching angle Apparatus and method thereof. Background technique [0002] With the construction of the Shenguang III host device in my country, the large-aperture uniaxial crystal is used as a frequency conversion element in the inertial confinement fusion system, which plays a crucial role in the final output energy of the system. In particular, the large-aperture KDP crystal is the key material for frequency doubling devices and electro-optic switches in high-power lasers. The quality of its materials and component processing quality greatly affect the realization of the final indicators of the devic...

AI Technical Summary

Problems solved by technology

However, this method is limited by the polarization state of the output light of the laser interferometer, and it cannot realize the measurement of the absorption coefficient of P-light and S-light by a large-aperture uniaxial crystal when the incident beam propagation direction and the crystal optical axis meet the phase matching angle.

[0004] Yang Xuezhi and others published a method for measuring the light absorption coefficient of optical crystals in the Machinery Industry Standard of the People's Republic of China. This method requires the light beam to be vertically incident on the optical crystal, which cannot realize the actual working state of the crystal (realize the propagation direction of the incident light beam and the optical axis of the crystal). Satisfying the phase matching angle), the measurement of material absorption coefficient

At the same time, this method cannot realize the measurement of the absorption coefficient of crystals for P light and S light.

The measurement accuracy of this method is not high, and it cannot meet the needs of modern crystal material absorption coefficient measurement.

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