Nonlinear transmittance testing device

Abstract

The invention discloses a nonlinear transmittance testing device. The device comprises a light source module used for providing an excitation light beam, a light intensity attenuation module used forattenuating the excitation light beam to preset power, a focusing lens used for focusing the attenuated light beam to the position of a sample, and a detector used for measuring related nonlinear optical properties of transmitted light passing through the sample. According to the device, the design of the light intensity attenuation module is adopted, so that while the space distribution uniformity of the incident light intensity is guaranteed, the incident light intensity can be adjusted in a nearly continuous mode; the intensity is adjusted to the required intensity, so that the error causedby manual repeated measurement of the excitation light intensity in a traditional testing method is avoided; and only by performing one-time calibration on the light intensity attenuation module, themeasurement of the related nonlinear optical properties of the light intensity can be rapidly realized, so that the measurement time is greatly shortened, and the requirements on the stability of thesample are lowered.

Description

technical field [0001] The invention relates to the field of nonlinear optics technology, in particular to a nonlinear transmittance testing device. Background technique [0002] With the rapid development of fields such as optical communication and optical information processing, the demand for research on nonlinear optical materials is increasing. Applications in optical information storage, optical switches, optical modulators, optical limiters, as well as laser processing and detection, and laser spectrum analysis all rely on the research progress of nonlinear optical materials. The nonlinear transmission curve is one of the important means to characterize the nonlinear optical properties of the material. By changing the intensity of the incident light, the intensity of the transmitted light passing through the nonlinear material is measured, and the curve of the sample transmittance changing with the intensity of the incident light is calculated and drawn. , through fu...

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Problems solved by technology

[0004] The advantage of the above method is that the test method is simple and does not require complicated instruments and equipment, but it is also accompanied by several disadvantages: First, in recent years, high-power ultrashort pulse lasers have been widely used in the field of nonlinear optics. Considering the damage threshold of optical components, the spot size Usually larger (commercial 35fs pulsed laser output spot diameter can reach 10mm), after passing through the gradient filter, it is very easy to cause uneven intensity distribution of the spot in space and affect the quality of the spot, which will affect the nonlinear optical properties of the material. Characterization and calculation of related parameters; secondly, the traditional measurement method takes a long time, because the position of the filter needs to be manually adjusted during the measurement process until the detector displays the power value to be tested. After the reading is stable, record the incident power value and then measure The light intensity transmitted through the sample increases the requirement for the stability of the sample, and it is easy to introduce measurement errors due to the change of the detector placement position when reading the incident light power each time

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