| 摘要 |
PURPOSE:To stabilize oscillation frequency and oscillation intensity by utilizing the freedom of the setting of the intensity of an intensity setter and selecting a value close to the maximum value of oscillating beams as a set point. CONSTITUTION:One polarized light in oscillating beams from a gas laser 1 is selected by a polarizer 2, and intensity thereof is detected by a photoelectric detector 3. The intensity signal is transmitted over a first cavity length control system consisting of a preamplifier 5, a gain control amplifier 6, a bias control amplifier 7, a summing amplifier 8 and a temperature regulator 4, thus stabilizing oscillation frequency. On the other hand, oscillation intensity at a single longitudinal mode is set apart from the intensity adjusting point of the first cavity length control system by an intensity setter 13, a difference between the set value and said intensity adjusting point is detected by a comparator 9, and positive-negative or negative-positive constant voltage is generated in response to the positive or negative value of an error. The constant voltage is charged or discharged slowly to linear type integrators 11, 12 through a high resistor 10, and output voltage from an operational amplifier 12 is increased or decreased gradually. The voltage is added to the signal voltage of the first cavity length control system by employing the amplifier 8. Accordingly, both voltage coincide while being brought close to the set value of the setter 13. |
