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2013 year, number 6

Multichannel Control System for an Acousto-Optical Modulator of Laser Radiation Based on Direct Digital Synthesis of Frequencies

V. P. Bessmeltsev, A. N. Raldugin, V. A. Sluev
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 1, Novosibirsk, 630090 Russia
Keywords: acousto-optical modulator, frequency synthesizer, device for laser recording, multichannel laser photoplotter, direct digital frequency synthesis, calibration of channels


A module of control of an acousto-optical modulator of laser radiation in a multifrequency mode on the basis of a multichannel synthesizer with direct digital synthesis of frequencies is described. Specific features of system operation during multichannel laser recording with controlled amplitude, phase, and frequency of the channels with automatic calibration of intensity in each channel are considered. Application of the system in a photoplotter for producing photomasks of printed circuit boards makes it possible to increase the resolution of the device and to improve stability and reproducibility of recording.