| 摘要 |
PROBLEM TO BE SOLVED: To appropriately detect synchronous light by a synchronizing sensor, regardless of the variance in machine differences or deterioration with lapse of time of a modulation element. SOLUTION: The minimum value X of light intensity which can be detected by the synchronization sensor is detected for a G (green) laser beam to be modulated by an AOM (acousto-optical modulator). Thereafter, a lower limiting value 2X of the light intensity is derived by doubling the minimum value X of the light intensity. Then, a lower limiting value Y of drive voltage corresponding to the lower limit value 2X of the light intensity is set. COPYRIGHT: (C)2008,JPO&INPIT
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