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If a suitable choice of parameters, and ultrasonic strong enough, can make all the laser energy transferred to almost zero level or +1 (or -1 level) of the diffraction extreme direction, so laser energy can be fully utilized. Therefore, use of Bragg diffraction acousto-optic devices made efficient. In theory, Maxwell's equations can be analyzed using the diffraction of light distribution. Analysis showed that the resulting Bragg diffraction conditions: where is the Bragg angle. Bragg diffraction of the zero-order diffracted light and an angle between the diffraction intensity of expression is. The worker should pay attention to self protection during manufacture process of led flash light.
Control of ultrasonic power to control the refractive index variation, so, there, that all the incident light energy is transformed into a diffraction light. The acousto-optic devices typically include four parts: power supply, transducer, and acoustic sound and light medium medium. Drive power was ultra-high frequency power signal generator, the output frequency, power Jieke tune. When added to the output signal on the transducer, then due to the piezoelectric crystal (such as quartz, LiNb, etc.) or piezoelectric semiconductors (CdS, ZnO, etc.) of the anti-piezoelectric effect produces mechanical vibration, the vibration in the sound and light media generated ultrasonic field. Acousto-optic medium is sound and light effects of the place, usually glass, fused silica, aluminum molybdate, antimony oxide and other materials. The warehouse stores a large mount of parts and components of green laser pointer .
Acousto-optic medium in the other side of sound-absorbing material, generally used in the lead-rubber or glass wool, etc., to absorb through the medium of ultrasound, to avoid reflections. He-Ne laser light, pre-combustion 20 minutes, it was basically stable. Adjust system components to coaxial. Added the source sound and light device, change the frequency and tuning system components, until the emergence of Raman - Ness diffraction observations. Acousto-optic devices to change the angle of the Bragg diffraction observations. According to the experimental apparatus to determine the diffraction angle measurement method. Observed Raman - Ness diffraction (tuning range of 30 ~ 60MHz): fixed light intensity, measured diffraction signal frequency of extreme deflection angle and the curve. Fixed light intensity, measured diffraction intensity and signal frequency curve. The worker is loading green laser pointer into the truck.
The observational data and theoretical calculations fitted to simple forms. Observed Bragg diffraction (tuning range of 100 ~ 150MHz): fixed light intensity, measured with a zero-order diffraction angle and signal frequency curve. To maintain the same frequency, measure the zero level, a strong diffraction bare, and the ultrasonic power curve. Adjust the He-Ne laser, aperture, acousto-optic devices and focusing lens, the laser beam hit the length measuring instrument panel, in the length measuring instrument among the most read highlights from the second point, and then tape measure sound and light measuring device with a long distance between the instrument, can be obtained using the diffraction angle arc tangent. The drawing of green laser pointer has to be renewed.