TW-LCE-B liquid crystal light valve characteristic tester Introduction: As early as the 1970s, liquid crystal, as the fourth state of material existence, began to be written into the textbooks of students all over the world. So far, it has become a field of common concern and research by physicists, chemists, biologists and engineering technicians, and has extensive applications in physics, chemistry, electronics, life sciences and many other fields. Among them, liquid crystal display devices, photoconductive liquid crystal light valves, light modulators, optical path conversion switches, etc. are all made using the principle of liquid crystal electro-optic effect. Moreover, liquid crystal can also be used as the working material of hybrid optical bistable device, which has the advantages of low working voltage, large light receiving surface, easy fabrication, easy control and easy realization of device integration. Twisted nematic liquid crystal light valve is the basis of the application of liquid crystal devices and the nonlinear medium in optical bistability. It is very meaningful to master its electro-optical characteristics from the practical point of view or the physical experiment teaching point of view. TW-LCE-B liquid crystal light valve comprehensive characteristic tester can complete the following physical experiments: 1. Measure the electro-optic curve of the liquid crystal sample, and obtain the main parameters of the electro-optic effect such as the threshold voltage, saturation voltage, contrast and gradient of the sample; 2. Demonstrate the display principle of the simplest segment liquid crystal display device (TN-LCD); 3. Understand the working principle of the photoelectric hybrid bistable device, adjust the appropriate magnification and bias voltage, and draw the bistable curve of light intensity. The physical experiment of this instrument has distinctive content, clear concept, stability and reliability, and reasonable structure design. It can be used for general physical experiments and design research experiments in colleges and universities. Technical parameters: 1. Semiconductor laser: 650nm red light, power about 2mW 2. Square wave voltage: frequency is about 500Hz. When measuring electro-optic effect, it is about 0-10V (effective value) and can be adjusted continuously 3. Optical power meter: two sets, measuring range 0-200 μ W and 0-2mW 4. Segmental LCD module: digital, normal white and normal black
Introduction: As early as the 1970s, liquid crystal, as the fourth state of material existence, began to be written into the textbooks of students all over the world. So far, it has become a field of common concern and research by physicists, chemists, biologists and engineering technicians, and has extensive applications in physics, chemistry, electronics, life sciences and many other fields. Among them, liquid crystal display devices, photoconductive liquid crystal light valves, light modulators, optical path conversion switches, etc. are all made using the principle of liquid crystal electro-optic effect. Moreover, liquid crystal can also be used as the working material of hybrid optical bistable device, which has the advantages of low working voltage, large light receiving surface, easy fabrication, easy control and easy realization of device integration. Twisted nematic liquid crystal light valve is the basis of the application of liquid crystal devices and the nonlinear medium in optical bistability. It is very meaningful to master its electro-optical characteristics from the practical point of view or the physical experiment teaching point of view. TW-LCE-B liquid crystal light valve comprehensive characteristic tester can complete the following physical experiments:
