Patent ID: 6879607

Claim:
A semiconductor laser module comprising: a semiconductor laser; a laser temperature control means having an electronic refrigeration portion and a temperature detection portion for detecting a temperature of the electronic refrigeration portion and outputting a detection signal, said laser temperature control means performing temperature control of said semiconductor laser while compensating for a delay in temperature variation by the electronic refrigeration portion with respect to input of a control signal to the electronic refrigeration portion; and a control signal generating means for inputting the detection signal output from the temperature detection portion, generating the control signal for setting the temperature of the electronic refrigeration portion to a set temperature, and sending the control signal to the electronic refrigeration portion, wherein said control signal generating means includes a means for generating a compensating signal for compensating for delay by the electronic refrigeration portion in varying temperature with respect to the control signal input to the electronic refrigeration portion, a means for generating a detection correction signal based on the detection signal and the compensating signal, and a means for generating the control signal based on the detection correction signal and a signal corresponding to the set temperature.