External cavity laser type light source
First Claim
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1. An external cavity laser light source comprising:
- a light emitting element for emitting a first light beam having a first wavelength distribution;
a wavelength selection element for selecting a wavelength of the first light beam and for returning a second light beam having a second wavelength distribution different from the first wavelength distribution to said light emitting element, said wavelength selection element including a band-pass filter and a mirror, in which the first light beam is introduced into the band-pass filter, output to the mirror, reflected by the mirror, again introduced into the band-pass filter, and outputted as the second light beam;
an optical branch element arranged between said light emitting element and said wavelength selection element, wherein the optical branch element branches the second light beam in a direction to be taken out as an output light beam; and
the output light beam contains no component of the first light beam directly emitted from the light emitting element.
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Abstract
An external cavity laser type light source including a light emitting element, a wavelength selection element for selecting a wavelength of light emitted from the light emitting element and for returning light to the light emitting element, and an optical branch element arranged between the light emitting element and the wavelength selection element. In the external cavity laser type light source, selected light sent from the wavelength selection element is branched by the optical branch element, and one branched component is taken out as output light.
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Citations
11 Claims
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1. An external cavity laser light source comprising:
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a light emitting element for emitting a first light beam having a first wavelength distribution;
a wavelength selection element for selecting a wavelength of the first light beam and for returning a second light beam having a second wavelength distribution different from the first wavelength distribution to said light emitting element, said wavelength selection element including a band-pass filter and a mirror, in which the first light beam is introduced into the band-pass filter, output to the mirror, reflected by the mirror, again introduced into the band-pass filter, and outputted as the second light beam;
an optical branch element arranged between said light emitting element and said wavelength selection element, wherein the optical branch element branches the second light beam in a direction to be taken out as an output light beam; and
the output light beam contains no component of the first light beam directly emitted from the light emitting element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An external cavity laser light source comprising:
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a light emitting element for emitting a first light beam having a first wavelength distribution;
a diffraction grating for selecting a wavelength of the first light beam and for returning a second light beam having a second wavelength distribution different from the first wavelength distribution to said light emitting element; and
a multiple-surface reflecting mirror having a first reflecting surface for reflecting the first light beam wavelength selected by the diffraction grating and again introducing the first light beam onto the diffraction grating, and a second reflecting surface different in surface angle from the first reflecting surface, the second reflecting surface for reflecting the first light beam to be taken out as an output light beam. - View Dependent Claims (9)
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10. An external cavity laser light source comprising:
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a light emitting element for emitting a first light beam having a first wavelength distribution;
a wavelength selection element for selecting a wavelength of the first light beam and for returning a second light beam having a second wavelength distribution different from the first wavelength distribution to said light emitting element, the wavelength selection element including a diffraction grating for diffracting the first light beam for selection of a wavelength thereof and a mirror for reflecting the first light beam diffracted by said diffraction grating to resend the first light beam to said diffraction grating, whereby the first light beam is diffracted by the diffraction grating twice and outputted as the second light beam; and
an optical branch element arranged between said light emitting element and said wavelength selection element, wherein the optical branch element branches the second light beam in an output direction to be taken out as an output light beam, and the output light beam contains no component of the first light beam directly emitted from the light emitting element. - View Dependent Claims (11)
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Specification