External cavity type light source

Details External cavity type light source External cavity type light source

H - Electricity

01

S

H01S 5/00 (2006.01) H01S 3/081 (2006.01) H01S 5/14 (2006.01)

Patent

CA 2290063

An external cavity type light source which has a semiconductor laser 1 coated on one end 1a with a reflection prevention film 1A, wherein emitted light from the end face of the semiconductor laser 1 on the reflection prevention film side is converted into collimated light and the collimated light having a wavelength selected through a diffraction grating 2 is fed back into the semiconductor laser 1, and wherein emitted light from an opposite end 1b of the semiconductor laser 1 is converted into collimated light and the collimated light is gathered and output to an optical fiber 10. An unpolarized light splitter (light branch element) 4 is placed between the diffraction grating 2 and the semiconductor laser 1, and the diffracted light fed back into the semiconductor laser from the diffraction grating is made to branch through the unpolarized light splitter 4 and one branch light is taken out as output light through an optical fiber 15.

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