According to the present invention, there is provided a solid-state laser
diode comprising:
- a laser diode for exciting a solid laser medium;
- a constant current source for supplying a constant current to the laser diode;
- voltage measurement unit for measuring a voltage at both ends of the
laser diode; and
- abnormality detection unit for detecting an abnormality at the laser
diode based on an output of the voltage measurement unit. Whereby a photodiode
need not be arranged on the periphery of the solid laser medium and the laser diode,
and an abnormality at the laser diode can be detected without increasing the size
of the device and complicating the device and without deteriorating the laser emission efficiency.
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