| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength stabilizer capable of stabilizing the wavelength of a leaser beam. SOLUTION: The wavelength stabilizer 112 is provided with a multi-mode semiconductor laser module 1c, a power adjusting circuit 114, a wavelength adjusting circuit 118. The multi-mode semiconductor laser module 1c is provided with a multi-mode laser element 34, a monitoring photodetector 45 and a wavelength detection device 90a. The monitoring photodetector 45 detects light from a semiconductor laser element 34. The wavelength detection device 90a has an optical filter 94 and a photodetector 96. The power adjusting circuit 114 receives a signal 45a from the power monitoring photodetector 45. Thus, optical power is controlled. A wavelength control circuit 116 receives an electric signal 96a from the wavelength detection device. A thermoelectronic cooling element 22 changes the temperature of the semiconductor laser element 34 in response to the electric signal from the wavelength control circuit 116. Thus, the wavelength of light is controlled.
|
