Abstract: An optical device disperses a wavelength of light and includes: a dispersion element configured to transmit incident light and disperse the incident light so that an optical path is different for each wavelength and to generate first dispersed light; and a reflection unit including four reflection surfaces sequentially reflecting the first dispersed light. The first dispersed light sequentially reflected from the four reflection surfaces is incident on the dispersion element and is transmitted through the dispersion element.

Abstract: The present invention provides an optical amplification apparatus for amplifying light from a light source, comprising: a combiner configured to output light received at a first input port from the light source as first light, and output light received at a second input port as second light; an optical amplifier configured to amplify an intensity of each of the first light and the second light output from the combiner; a splitter configured to output the received first light from a first output port, and output the received second light from a second output port; and an optical modulator configured to attenuate an intensity of light output from the first output port of the splitter, wherein the light output from the first output port of the splitter is received at the second input port of the combiner via the optical modulator.

Abstract: To control a focus position of light at a high speed and with high precision, an optical apparatus includes a first reflection surface 101 configured to be rotatable about a rotational shaft 104 and reflect the light; a second reflection surface 102 configured to be rotatable about the rotational shaft 104, face the first reflection surface 101, and reflect the light from the first reflection surface 101; a third reflection surface 114 that returns the light from the second reflection surface 102 to the second reflection surface 102; and a control unit 120 configured to control a focus position in an optical axis direction of the light returned back to the first reflection surface 101 from the third reflection surface 114 via the second reflection surface 102 by rotating the first and second reflection surfaces 101 and 102 about the rotational shaft 104 in a state in which a relative arrangement between the first and second reflection surfaces 101 and 102 is maintained.

Abstract: A measuring device measures a displacement amount or a speed of a measured object, the measuring device including an irradiation optical system that irradiates the measured object, a collection optical system that collects a first beam and a second beam emitted from the measured object so as to overlap the first beam and the second beam on each other, a first detector that detects superimposed light in which the first beam and the second beam are superimposed on each other, and a second detector that detects a partial beam of the emitted beam emitted from the collection optical system. A detection result of the second detector changes according to a distance between the measuring device and the measured object.

Abstract: A center wavelength of first pulsed light (exciting pulsed light) is variable, and a pulse rate of the first pulsed light coincides with an integer multiple of a free spectral interval of an optical oscillator at a center wavelength of second pulsed light (signal pulsed light or idler pulsed light). A center wavelength of a nonlinear gain generated by a nonlinear optical medium is made approximately coincident with the center wavelength of the second pulsed light.

Abstract: The present invention provides a measurement apparatus for measuring a velocity of a measurement object in a moving direction, including an optical system configured to divide each of lights emitted from a light source unit into first light and second light and irradiate the measurement object with the lights such that the first light and the second light overlap to form an interference fringe at different positions in a direction orthogonal to the moving direction in correspondence with wavelengths of the lights, wherein a first wavelength of the first light is different from a second wavelength of the second light, a first detection unit configured to detect the light from the measurement object, and a processing unit configured to obtain the velocity based on a change in an intensity of the light detected by the first detection unit.

Abstract: A center wavelength of first pulsed light (exciting pulsed light) is variable, and a pulse rate of the first pulsed light coincides with an integer multiple of a free spectral interval of an optical oscillator at a center wavelength of second pulsed light (signal pulsed light or idler pulsed light). A center wavelength of a nonlinear gain generated by a nonlinear optical medium is made approximately coincident with the center wavelength of the second pulsed light.

Abstract: A signal generation method for generating an information signal F(b) by performing a Fourier transform on a signal f(a) includes the following steps: detecting the maximum peak intensity of the information signal F(b); calculating an amplitude, a phase, and a frequency of the signal f(a) corresponding to the maximum peak intensity; generating a signal by causing the signal f(a) corresponding to the maximum peak intensity to extend along an ‘a’ axis on the basis of information about the amplitude, the phase, and the frequency of the signal f(a); generating an extrapolation signal by extracting a signal in a region smaller than a1 and a signal in a region larger than a2 from the signal, where a1<a2; generating a composite signal by combining the extrapolation signal with the signal f(a) in a range from a1 to a2; and performing a Fourier transform on the composite signal.

Abstract: A spectral domain optical coherence tomograph comprising: a light source, a beamsplitter, a reference arm, a dispersive device, and a sensor array. Wherein the dispersive device is a spatial chromatic dispersive device that spreads an interference light signal produced by the beamsplitter. Wherein each pixel in the sensor array is identified by an index i. Wherein the sensor array may be positioned relative to the dispersive device such that each pixel i detects wavelengths of the interference light having: a spectral width ??i; a central wavelength ?ci; having a coherence length defined as ? ? ? l i ? ? ci 2 ? ? ? ? i . Wherein a reflective or refractive optical element is placed between the dispersive device and the sensor array to transform the spatial chromatic dispersion such that ?li=?li+j is obtained for each pixel in the sensor array.

Abstract: A spectral domain optical coherence tomography apparatus for measuring a sample. The spectral domain optical coherence tomography includes a broadband light source, that supplies broadband light to the sample and a reference. The spectral domain optical coherence tomography apparatus includes a wavelength selective switch that receives mixed light that is a combination of the broadband light that is reflected off the sample and the reference. The spectral domain optical coherence tomography apparatus includes a sensor that includes a plurality of pixels. The wavelength selective switch guides a first portion of the mixed light that is within a first wavelength and a second wavelength to the sensor during a first period of time. The wavelength selective switch guides a second portion of the mixed light that is within a third wavelength and a fourth wavelength to the sensor during a second period of time.

Abstract: An alignment process for a balance detecting spectral domain optical coherence tomography system. The alignment process includes comparing a spectral performance curve of a first detector array to a spectral performance curve of a second detector array to determine if the system is aligned.

Abstract: The OCT apparatus includes a first light source unit changing an optical wavelength, a second light source unit changing an optical wavelength over a wavelength range different from and partially overlapping with that of the first light source unit, a signal generating unit receiving light from the light source units to generate signals at an equal wave number interval, an interference optical system splitting the light from the first and second light source units into illumination light illuminating an object and reference light, to generate first and second interference light, a light detecting unit receiving interference light, and an information acquiring unit acquiring a tomographic image of the object by linking temporal waveforms of intensities of the first and second interference light. The information acquiring unit links the temporal waveforms of the intensities of the first and second interference light based on the signal generated from the signal generating unit.

Abstract: An apparatus for altering a chirp of an input light comprising one or more grating structures and one or more electro-optical blocks. In which a voltage is applied to the one or more electro-optical blocks to alter a chirp of light exiting the apparatus.

Abstract: An apparatus for altering a chirp of an input light comprising one or more grating structures and one or more electro-optical blocks. In which a voltage is applied to the one or more electro-optical blocks to alter a chirp of light exiting the apparatus.

Abstract: A laser system includes a seed laser configured to generate a plurality of optical pulses; a controller configured to receive the plurality of the optical pulses and obtain chirped pulses, each chirped pulse having a chirping amount different from each other; an optical waveguide, having a characteristic of anomalous dispersion, configured to cause soliton self-frequency shifts while the chirped pulses propagating so that each center wavelength of a pulse which output from the optical waveguide is different from each other.

Abstract: A fiber optic parametric amplifier that includes a resonating cavity. The resonating cavity includes linear fiber optic gain medium, with negative chromatic dispersion; and a nonlinear fiber optic gain medium with positive chromatic dispersion.

Abstract: An optical coherence tomography apparatus includes a light source unit that emits light including lights emitted from swept sources, which have different center wavelengths and partially overlapping output spectral ranges, the lights having the respective output spectral ranges and being temporally separated from each other, a dividing unit that is connected to the light source unit and that divides the light emitted from the light source unit, a wavelength selecting unit that is connected to the dividing unit and that selects light having a predetermined wavelength from a range in which the output spectral ranges overlap, a time detecting unit that is connected to the wavelength selecting unit and that detects times at which the swept sources oscillate at the predetermined wavelength, and a wavenumber detecting unit that is connected to the dividing unit and that detects times at which the lights from the swept sources have the same wavenumber.

Abstract: A fiber optic parametric amplifier that includes a resonating cavity. The resonating cavity includes linear fiber optic gain medium, with negative chromatic dispersion; and a nonlinear fiber optic gain medium with positive chromatic dispersion.

Abstract: A laser system includes a seed laser configured to generate a plurality of optical pulses; a controller configured to receive the plurality of the optical pulses and obtain chirped pulses, each chirped pulse having a chirping amount different from each other; an optical waveguide, having a characteristic of anomalous dispersion, configured to cause soliton self-frequency shifts while the chirped pulses propagating so that each center wavelength of a pulse which output from the optical waveguide is different from each other.

Abstract: The optical coherence tomography apparatus includes: a light source unit; a branch unit for branching light output from the light source unit into measurement light and reference light; an interference unit for causing reflection, the reflection being light returned from an object, which is illuminated with the measurement light, to interfere with the reference light; and a detection unit for receiving interference light from the interference unit so as to detect an intensity of the interference light. The optical coherence tomography apparatus acquires a tomographic image of the object based on the intensity of the interference light detected by the detection unit. The interference unit outputs first and second interference light having interference components having phases mutually different by ?. The first and second interference light output from the interference unit reaches the detection unit so that a time gap is generated between the first and second interference light.