Waveform controlling system of optical beam scanner

Abstract

Abstract PURPOSE:To execute wavelength stabilizing control by providing a means for detecting a wavelength variation of zero-order transmitting light of a deflecting element, and controlling a light source driving condition so that the variation quantity becomes zero. CONSTITUTION:For instance, an optical beam 3 outputted from a light source 2 such as a semiconductor laser is made incident to a diffraction type deflecting element 4 such as a hologram. Usually, as for the deflecting element 4, the diffraction condition is set so that its primary diffracted light intensity becomes the largest. A primary diffracted light 5 moves in one plane by motion of the deflecting element 4. On the other hand, a zero-order diffracted light 6 which is not diffracted by the deflecting element 4, namely, transmitting light is made incident to a wavelength variation detecting part 7, in which a shift signal 8 (the direction and the magnitude of a wavelength variation) to a reference value is derived. A control signal corresponding to the shift signal 8 is fed back to a light source control part 1 from a control signal generating part 9. The light source control part 1 controls a wavelength of the light source 2 so that the shift signal 8 becomes zero, by which an optical beam scanning can be executed with high accuracy and high stability.

Inventors

• 👤 Shunji Kitagawa
• 👤 俊二 北川
• 👤 Fumio Yamagishi
• 👤 文雄 山岸
• 👤 Kozo Yamazaki
• 👤 行造 山崎
• 👤 Shinya Hasegawa
• 👤 信也 長谷川
• 👤 Hiroyuki Ikeda
• 👤 池田　弘之

Bibliographic Details