JP2550865B2 - Laser resonator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser resonator having an automatic alignment adjusting function, and more particularly to a laser resonator which automatically adjusts alignment by using a deflection prism.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional laser resonator comprises a rear mirror 4, a deflection prism 5, a laser medium 6, a laser diode 7, a polarizer 8, a Pockels cell 9, and a front mirror 10. There is.

In such a conventional laser resonator,
All the components from the rear mirror 4 to the front mirror 10 are adjusted in advance to the optimal alignment state.

In the laser resonator in which all the constituent elements are adjusted in advance to the optimum alignment as described above, when the optimum alignment state is collapsed due to the thermal lens effect of the laser medium 6 or environmental changes, the deflection prism 5 is turned to the maximum. It was manually modified to get the output.

[0005]

In the conventional laser resonator, there has been a troublesome point that the misalignment caused by the thermal lens effect of the rod and the environmental change must be manually corrected to the optimum state.

An object of the present invention is to provide a laser resonator that automatically adjusts alignment using a deflection prism.

[0007]

SUMMARY OF THE INVENTION The present invention is a deflection angle prism.
In the laser cavity for alignment adjustment using
A detector for detecting leaked light from a rear mirror that constitutes a laser resonator, a discriminator that monitors and determines the output signal level of the detector, and the laser resonator based on the discriminator determination. Provided inside
Automatically and a driving circuit for driving the deviation prism
It is characterized by adjusting the alignment .

[0008]

EXAMPLES A laser resonator having an automatic alignment adjusting function according to the present invention will be described in detail below with reference to Examples.

FIG. 1 is a diagram showing an embodiment of the present invention.
The laser resonator having the automatic alignment adjusting function of this embodiment includes a detector 1, an attenuator 2, a condenser lens 3,
Rear mirror 4, Deflection prism 5, Laser medium 6, Laser diode 7, Polarizer 8, Pockels cell 9, Front mirror 10, Discriminator (including detector power supply)
11, a deflection angle prism drive circuit (including a power supply) 12, and an alarm indicator 13.

The laser resonator of this embodiment is different from the conventional laser resonator shown in FIG. 2 in that it has a condenser lens 3 for condensing the laser light leaking from the rear portion of the rear mirror 4 and the condensed laser light. An attenuator 2, a detector 1 for detecting the attenuated laser light, a discriminator 11 for determining the reception level thereof, and a drive circuit 12 for driving the deflection angle prism 5 by the discriminator 11. An alarm display 13 for displaying an alarm is added.

Next, the operation of this embodiment will be described.

The respective components from the rear mirror 4 to the front mirror 10 are adjusted in advance to the optimum alignment state. At this time, the laser light leaking from the rear mirror 4 is focused by the condenser lens 3, attenuated by the attenuator 2, and then made incident on the detector 1. The discriminator 11 sets the judgment threshold level at a value 10% lower than the output from the detector 1, and when the output does not exceed this threshold, the deflection circuit 5 is rotated by the drive circuit 12, Stop when the maximum output exceeds the threshold. By this operation, the laser resonator always maintains the optimum alignment state.

When the excitation light deteriorates, dust adheres to optical parts, or damage occurs, the laser output is reduced. In this case, even if the deflection prism 5 is rotated once, the output of the detector 1 does not exceed the threshold at all, and at this time, the alarm display 13 displays an alarm.
As described above, according to the present embodiment, it is possible to detect early when the laser output is down.

[0014]

As described above, according to the present invention, the alignment state of the laser resonator is constantly monitored, and the misalignment state caused by the thermal lens effect of the laser medium and the environmental change is automatically optimized, and the maintenance-free laser is obtained. It has an effect that a resonator is obtained.

In the unlikely event that the excitation light deteriorates, dust adheres to optical parts, or damage occurs, the laser output is lowered, and an alarm is displayed to enable early detection and repair.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional example.

[Explanation of symbols]

 1 Detector 2 Attenuator 3 Condenser Lens 4 Rear Mirror 5 Deflection Prism 6 Laser Medium 7 Laser Diode 8 Polarizer 9 Pockels Cell 10 Front Mirror 11 Discriminator 12 Declination Prism Drive Circuit 13 Alarm Indicator

Claims (2)

(57) [Claims] 1. An alignment adjustment using a deflection prism.
In the laser resonator, a detector for detecting leaked light from a rear mirror constituting the laser resonator, a discriminator for monitoring and determining an output signal level of the detector, and a discriminator for determining. In addition, a drive circuit for driving the deflection angle prism provided inside the laser resonator is provided to automatically perform alignment adjustment.
A laser resonator to be used. 2. Based on the judgment of the discriminator,
The laser resonator according to claim 1, further comprising an alarm indicator for displaying an alarm.