To safely and reliably detect the state of irradiating with a laser beam when irradiating an object with the laser beam.
The light irradiation apparatus 1 is provided with: a laser light source 10 which generates the laser beam; a light source 20 for light to be detected which generates the light to be detected of a prescribed wavelength; an optical fiber 30 which inputs the laser beam at its one end face 30a and emits it from the other end face 30b to irradiate the object 3, which inputs the light to be detected at the one end face 30a, and which has an FBG (Fiber Bragg Grating) 32 reflecting light of a prescribed wavelength formed in the vicinity of the other end face 30b; a light detector 50 which detects intensity of the light to be detected which is reflected by the FBG 32 and emitted from the one end face 30a; and a signal processing part 60 which detects the state of irradiating the object 3 with the laser beam based on the intensity of the detected light to be detected. The laser beam generated from the laser light source 10 is other than the light of the wavelength reflected by the FBG 32.
YAMASHITA YUTAKA
YAMAUCHI TOYOHIKO
OKADA HIROYUKI
| JP2006501930A | 2006-01-19 | |||
| JP2002272737A | 2002-09-24 | |||
| JP2000508938A | 2000-07-18 | |||
| JP2000508939A | 2000-07-18 |
Shiro Terasaki
Satoru Ishida
Kenji Fukaishi