High-density multi-channel acousto-optic modulation device

Abstract

The invention discloses a high-density multi-channel acousto-optic modulation device. In the device, a laser bar, a fast axis collimation cylindrical mirror, a slow axis collimation cylindrical mirror, a focusing lens, a field lens, an acousto-optic modulation crystal and a light barrier are arranged on the main optical axis in sequence, wherein a secondary optical axis is formed at an included angle position of between 20 and 30 degrees of the main optical axis through the acousto-optic modulation crystal; a shutter, an image lens group and an image medium are sequentially arranged on the secondary optical axis; and an intersection type ultrasonic transducer and an inter-digital electrode are arranged at one end of the acousto-optic modulation crystal, and an ultrasonic absorption end is arranged at the other end of the acousto-optic modulation crystal. The light transmission area of the shutter is of a rectangular shape, the shutter is open when a shutter switch signal is triggered, and otherwise the shutter is closed. The high-density multi-channel acousto-optic modulation device ensures that the output laser has high density and multiple channels, laser modulation over 256 paths can be easily realized, the light beam has good consistency, the light paths are parallel to facilitate further collimation and focusing, and the modulation array can be well applied to computer to plate (CTP), laser image setting and laser light printing systems.

Description

technical field [0001] The invention relates to the technical field of laser medium imaging, in particular to a high-density multi-channel acousto-optic modulation device. Background technique [0002] Commonly used in the existing laser multi-channel scanning technology are fiber synthesis technology, acousto-optic frequency division modulation (AOFM) technology and acousto-optic parallel modulation (AOPM). Optical fiber synthesis technology is to use multiple optical fibers side by side and image them with an imaging objective lens. The coupling efficiency of each optical fiber and laser diode is different, and it needs to be adjusted independently to avoid the inconsistency of each light spot. In order to reduce the divergence angle, Lasers require less power. When many optical fibers are arranged side by side, the whole system is huge and complicated, and it is difficult to realize scanning of more than 64 optical fibers. Acousto-optic frequency division modulation (AO...

AI Technical Summary

Problems solved by technology

Due to the electrical crosstalk and acoustic crosstalk between adjacent electrodes, the number of such parallel modulation channels cannot be too many and it is difficult to reach more than 32 channels.

Images