Device for measuring scattering coefficients and absorption coefficients of laser working media

Abstract

A device for measuring scattering coefficients and absorption coefficients of laser working media consists of a testing laser device, an integrating sphere, a photoelectric detector, a laser power meter and an oscilloscope, wherein a white diffusion reflection layer is coated on the inner wall of the hollow integrating sphere; a light entering hole, a light exiting hole and a detecting hole are formed in the spherical wall of the integrating sphere; the light entering hole and the light exiting hole are positioned in the left side spherical wall and the right side spherical wall of the integrating sphere; a connecting line of centers of the light entering hole and the light exiting hole is a horizontal line and penetrates through the center of the integrating sphere; the testing laser device and the laser power meter are respectively placed on the outer side of the light entering hole and the outer side of the light exiting hole; the photoelectric detector is positioned on the outer side of the detecting hole and is connected with the detecting hole; a laser working medium sample to be measured is fixed in the center of the integrating sphere; testing laser emitted from the testing laser device enters the light entering hole, perpendicularly reaches one end surface of the sample, and exits from the other end surface of the sample and the light exiting hole; the loss coefficient of the sample to be measured is obtained by using a total transmittance measured value, a total diffusivity measured value and a calculation formula for the scattering coefficients and the absorption coefficients; and accuracy is high, and the optical performance of the laser working media can be well showed.

Description

technical field [0001] The invention belongs to the field of laser working medium characterization and evaluation, in particular to a device for measuring the scattering coefficient and absorption coefficient of the laser working medium. Background technique [0002] Since the birth of the world's first laser in 1960, various lasers and laser technologies have developed extremely rapidly. Laser technology has been widely used in various fields, especially scientific research and national defense construction, and has become one of the important pillars of modern science and technology and social development. Among them, laser diode pumped solid state lasers (laser diode pumped solid state lasers, LDPSSL or DPL), that is, all-solid-state lasers have developed particularly prominently due to their small size and light weight, and have shown great potential in material processing, military and medical fields. application prospects. [0003] In the development of all-solid-sta...

AI Technical Summary

Problems solved by technology

At present, the loss measurement methods of laser working medium can be divided into three types: absorption coefficient measurement, total loss coefficient measurement, and scattering coefficient and absorption coefficient measurement. Among them, the first two methods can evaluate the absorption characteristics or total loss of materials, but neither can comprehensively To evaluate the loss characteristics of materials, we have developed a loss measurement instrument that can realize the measurement of scattering coefficient and absorption coefficient 2 , which is the third loss measurement method mentioned above

This method can measure the scattering coefficient and absorption coefficient of the sample, so as to quantitatively and comprehensively evaluate the scattering performance and absorption performance of the material. The error is large; and the Fresnel loss of the laser working medium end to the pump light is not considered in the theoretical calculation process, and the scattering coefficient and absorption coefficient are approximately calculated by using the one-way transmission of the pump light inside the material, and the accuracy is low

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