Wavelength tunable light source
a a a There is provided a wavelength tunable light source in which one end surface of a semiconductor laser is applied anti-reflection film, a lens collimates a light beam emitted from the one end surface of the semiconductor laser onto which the anti-reflection film is applied, and a wavelength sel...
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| Format | Patent |
| Language | English |
| Published |
01.02.2005
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| Online Access | Get full text |
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| Summary: | a a a There is provided a wavelength tunable light source in which one end surface of a semiconductor laser is applied anti-reflection film, a lens collimates a light beam emitted from the one end surface of the semiconductor laser onto which the anti-reflection film is applied, and a wavelength selection portion constituted by a combination of a diffraction grating and a mirror selects a light beam having a desired wavelength to return the selected light to the semiconductor laser to make laser oscillation. A center of rotation of the mirror is provided in a position Pwhere mode hopping can be suppressed when the wavelength is tuned and rotation of the mirror is driven by a direct drive system by using a motor having a rotation shaft in the center of rotation of the mirror |
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