| 摘要 |
PROBLEM TO BE SOLVED: To expand a wavelength scanning range in a wavelength scanning type laser light source. SOLUTION: This wavelength scanning type laser light source is composed of an optical fiber loop 11 including a gain medium 12, an optical circulator 13, a light beam deflection part, and a diffraction grating 27. A laser is oscillated, and a trigger signal is detected at each scanning cycle. The trigger signal is inputted to a current controller 34, and an injection current into the gain medium 12 is controlled from the current controller 34. When the level of the injection current is controlled to be lowered in accordance with the oscillation level on a wavelength scanning basis, a wavelength can be scanned over a wide range without destroying the gain medium 12 by COD. COPYRIGHT: (C)2010,JPO&INPIT |
