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Proceedings Paper

Three-channel acousto-optic modulator for laser projection display system
Author(s): Yonghoon Kim; Jungho Park; Seungnam Cha; Young Mo Hwang
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Paper Abstract

A small laser projection display system is designed with a hybrid dichroic mirror for color separation, a hybrid dichroic mirror for color recombination, a 3-channel acousto-optic modulator (AOM) and a scanning part. The 3-channel AOM modulates red, green and blue laser beams. The wavelengths of red, green and blue beams are 647, 515 and 488 nm respectively. The carrier frequencies of each channel of AOM were adjusted to minimize the diffraction angle differences among red, green and blue laser beams. The carrier frequencies are 130, 168, 178 MHz for red, green and blue laser beams respectively. The measured diffraction angle after the carrier frequency control equals to the calculated diffraction angle. The transducer structure of AOM was optimized to get a high diffraction efficiency and to maximize isolation between adjacent channels by a slicing saw, which enhanced the electrical and acoustic isolation. The impedance matching- circuit of each electrode is housed in a separate compartment to suppress electrical crosstalk. The diffraction efficiency and risetime of the 3-channel AOM are over 85% and 50 nsec per each cell. The crosstalk between the channels is less than -30 dB.

Paper Details

Date Published: 29 October 1998
PDF: 9 pages
Proc. SPIE 3429, Current Developments in Optical Design and Engineering VII, (29 October 1998); doi: 10.1117/12.328546
Show Author Affiliations
Yonghoon Kim, Samsung Advanced Institute of Technology (South Korea)
Jungho Park, Samsung Advanced Institute of Technology (South Korea)
Seungnam Cha, Samsung Advanced Institute of Technology (South Korea)
Young Mo Hwang, Samsung Advanced Institute of Technology (South Korea)


Published in SPIE Proceedings Vol. 3429:
Current Developments in Optical Design and Engineering VII
Alson E. Hatheway; Robert E. Fischer; Malachy McConnell; Lawrence M. Germann; Lawrence M. Germann; Alson E. Hatheway; Malachy McConnell; Warren J. Smith, Editor(s)

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