| 摘要 |
PURPOSE:To eliminate excess light emission to lose the lifetime of a semiconductor laser by reducing the error signal component AC amplitude of light output to the minimum value in the lowest temperature of the allowable operation temperature range of the laser. CONSTITUTION:An output stabilizing circuit is adjusted in the lowest temperature in an allowable operation temperature range or in the lowest temperature state which is produced in a similar manner, the amplitude of the error signal component is suppressed to the vicinity of zero. The increment of the output which is calculated in advance from the input-output curve of a semiconductor laser is represented as the similar lowest temperature state by installing an amplifier 51 in a feedback loop. A switch 50 is formed of two systems, one of which is an amplifier 51, and the other of which is adjusted and is a system used when the feedback loop is closed and actually operated. The error signal component amplitude becomes 0 at the lowest temperature, and increased to positive direction at the other temperature, and the light output does not become excessive even in the moment in any temperature state. |
