Abstract:
The present invention provides a light source apparatus capable of producing stable oscillation and performing high-speed wavelength sweeping over a desired wavelength range. A swept light source apparatus in which oscillation wavelength is continuously changeable is provided. The apparatus includes, inside a resonator, an optical amplification medium that amplifies light, a first device configured to disperse light emitted from the optical amplification medium and thus produce beams having different wavelengths, a second device functioning as a non-focusing optical element and configured to collimate the beams having different wavelengths resulting from the dispersion by the first device, and a selecting device configured to select a beam having a specific wavelength from among the beams collimated by the second device. The beam having the specific wavelength selected by the selecting device is fed back to the optical amplification medium.
Abstract:
A swept light source apparatus in which oscillation wavelength is continuously changeable is provided. The apparatus includes, inside a resonator (103, 109), an optical amplification medium (101) that amplifies light, a first device (106) configured to disperse light emitted from the optical amplification medium and thus produce beams having different wavelengths, a second device (107) functioning as a non- focusing optical element and configured to collimate the beams having different wavelengths resulting from the dispersion by the first device, and a selecting device (108) configured to select a beam having a specific wavelength from among the beams collimated by the second device. The beam having the specific wavelength selected by the selecting device is fed back to the optical amplification medium. The first and second device may be diffraction gratings or acousto - optical devices. The selcting device may include metal-foil ribbons (301, 302) or an acousto - optical device (108).