WAVELENGTH-VARIABLE LIGHT SOURCE
PROBLEM TO BE SOLVED: To provide an external resonator-type wavelength-variable light source capable of securing excellent wavelength selectivity with a small number of parts and taking out light output efficiently over a wide wavelength band range even when using a semiconductor laser having a far...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To provide an external resonator-type wavelength-variable light source capable of securing excellent wavelength selectivity with a small number of parts and taking out light output efficiently over a wide wavelength band range even when using a semiconductor laser having a far field pattern narrow in a horizontal direction. SOLUTION: The external resonator-type wavelength-variable light source selecting the wavelength of light from a semiconductor laser using a diffraction grating is characterized in that an achromatic prism produced by laminating two types of glass materials with Abbe numbers different from each other, is provided between the semiconductor laser and the diffraction grating. COPYRIGHT: (C)2010,JPO&INPIT |
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