| 摘要 |
The present invention relates to an external oscillator-type laser apparatus capable of producing laser light having a uniform wavelength regardless of changes in temperature in the external environment, and of being manufactured so as to be ultra-small. The laser apparatus according to the present invention is a laser apparatus having a uniform oscillation wavelength regardless of external conditions, and comprising: a laser diode chip (100) for emitting laser light; a partially-reflecting light feedback mirror (500) for reflecting a portion of the light emitted by the laser diode chip (100) and feeding the light back to the laser diode chip (100); a collimating lens (200) installed in the light path between the laser diode chip (100) and the partially-reflecting light feedback mirror (500), for collimating the light emitted by the laser diode chip (100); a selective wavelength filter (300) for transmitting a certain selected wavelength of light; and a 45 degree reflecting mirror (400) for changing the direction of laser light travelling parallel to the bottom surface of a package such that it travels perpendicular to the bottom surface of the package, wherein a small laser apparatus can be manufactured by minimizing the length of the horizontal axis and the effective optical length of a laser oscillator formed between the laser diode chip and the partially-reflecting light feedback mirror.
|
