Wavelength tunable light source of external resonator type
AssigneeYokogawa Electric Corporation
InventorsAkishige ITO, Keisuke ASAMI, Yasuyuki SUZUKI
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Abstract
An improvement is made to a wavelength tunable light source of an external resonator type for selecting a wavelength of light from a semiconductor laser using a diffraction grating. The device has a prism provided between the semiconductor laser and the diffraction grating for enlarging the beam shape of the light from the semiconductor laser in the groove arrangement direction of the diffraction grating, emitting the light to the diffraction grating, and reflecting diffracted light from the diffraction grating to provide output light.
Claims8
A wavelength tunable light source of an external resonator type comprises:
- a semiconductor laser for emitting a light;
- a diffraction grating for selecting a wavelength of the light from the semiconductor laser;
- and
- a prism being provided between the semiconductor laser and the diffraction grating for enlarging a beam shape of the light from the semiconductor laser in a groove arrangement direction of the diffraction grating, emitting the light to the diffraction grating, and reflecting a diffracted light from the diffraction grating to provide an output light.
Dependencies are inferred from the claim text.