Abstract: An optical device mounting method for mounting an optical device to a holding mechanism, including a step of designing a shape of the optical device in accordance with a stress expected to be applied to the optical device, such as not to cause the optical device to deform or to inhibit deformation to achieve desired performance.

Abstract: A photoelectric conversion apparatus includes an interferometer configured to cause interference in wavelength swept light Lx output from a wavelength swept light source X and is configured to convert the interfered wavelength swept light by photoelectric conversion. A signal processing apparatus calculates, in chronological order, relative frequencies fr(t) indicating frequencies relative to interference signals i(t) obtained by the photoelectric conversion of the interference light iL, and measures a difference between a maximum value and a minimum value of the relative frequencies fr(t), as a sweep frequency width ?f of the wavelength swept light Lx.

Abstract: The present invention includes an optical deflector that changes a deflection angle depending on an applied voltage, a voltage control unit that applies a voltage to the optical deflector, and a storage unit that stores a value of a voltage to be output by the voltage control unit. The voltage control unit outputs a voltage of a value stored in the storage unit to the optical deflector. The storage unit stores a goal voltage V=ggoal(t), which provides a deflection angle ? with the goal time dependency ?=?goal(t).

Abstract: In an embodiment, an optical deflection device includes: an electro-optic crystal comprising KTa1-xNbxO3, the electro-optic crystal having a first surface and a second surface, the first surface and the second surface facing each other; a first electrode on the first surface of the electro-optic crystal; a second electrode on the second surface of the electro-optic crystal; a power source configured to output a control voltage for forming an electric field inside the electro-optic crystal via the first electrode and the second electrode; and a light source configured to emit a pulse laser to be incident on the electro-optic crystal along an optical axis, the optical axis substantially perpendicular to a direction of the electric field formed by the control voltage, wherein a peak power density of the pulse laser output from the light source at a light incidence surface of the electro-optic crystal is less than 800000 W/cm2.

Abstract: The present invention includes an optical deflector that changes a deflection angle depending on an applied voltage, a voltage control unit that applies a voltage to the optical deflector, and a storage unit that stores a value of a voltage to be output by the voltage control unit. The voltage control unit outputs a voltage of a value stored in the storage unit to the optical deflector. The storage unit stores a goal voltage V=ggoal(t), which provides a deflection angle ? with the goal time dependency ?=?goal(t).

Abstract: A distance measurement apparatus includes a first acquisition unit that acquires a time tr, i of each peak pr, i included in a second reference signal obtained by photoelectrically converting light periodically intensity-modulated and output from a light source, a second acquisition unit that acquires a peak ps, i present in a range of ±Tsource/2 based on the time tr, i from a second detection signal obtained by photoelectrically converting reflected light of light output from the light source and reflected by an object, and a distance calculation unit that calculates a distance to an object based on a cross-correlation between a first signal obtained by processing the second reference signal in a state where a peak of a window function matches the peak ps, i and a second signal obtained by processing the second detection signal in a state where a peak of a window function matches the peak ps, i.

Abstract: A range finding apparatus includes an optical system including a correction mirror disposed near an object, and a PDs that detects reflected light obtained when light emitted from a light source and cyclically modulated in intensity is reflected by the object and a correction mirror, and a signal processing device including a range finding device that outputs a distance signal Ln indicating a distance to the object, based on a time period until the reflected light is detected by the PDs, a correction mirror range finding device that outputs a distance signal Lcor indicating a distance to the correction mirror, and a distance correction device that corrects the distance signal Ln, based on the distance signal Lcor, and outputs a distance signal Ln, cor indicating the distance to the object.

Abstract: A swept light source of the present invention keeps a coherence length of an output beam long over an entire sweep wavelength range. A gain of a gain medium is changed with time in response to a wavelength sweep and the coherence length is kept maximum. The gain of the gain medium is kept close to a lasing threshold and an unsaturated gain range of the gain medium is narrowed over the entire sweep wavelength range. An SOA current waveform data acquiring method of driving while keeping the coherence length long, a novel coherence length measuring method, and an optical deflector suitable for the swept light source are also disclosed.

Abstract: A swept light source of the present invention keeps a coherence length of an output beam long over an entire sweep wavelength range. A gain of a gain medium is changed with time in response to a wavelength sweep and the coherence length is kept maximum. The gain of the gain medium is kept close to a lasing threshold and an unsaturated gain range of the gain medium is narrowed over the entire sweep wavelength range. An SOA current waveform data acquiring method of driving while keeping the coherence length long, a novel coherence length measuring method, and an optical deflector suitable for the swept light source are also disclosed.

Abstract: A head portion for irradiating the surface of a structure to be processed with laser light and a diffractive optical element housed in the head portion are provided. Laser light emitted from a light source is delivered by an optical fiber and guided into the head portion through a light input portion of the head portion. The laser light delivered by the optical fiber is collimated by a collimator into parallel light and passes through the diffractive optical element, thereby producing shaped light with a broadened radiation distribution. The shaped light is emitted through an emitting portion of the head portion and is radiated onto a processing target surface of the structure to be processed.

Abstract: An optical deflector includes an electro-optical material in a paraelectric phase and having a trap for accumulating charges inside the electro-optical material; an electrode pair formed on facing surfaces of the electro-optical material; a first and second conductor hold units provided so as to hold the electro-optical material and the electrode pair therebetween; a temperature sensor that measures at least one of temperatures of the conductor hold units; and a temperature control unit that controls the temperatures of the conductor hold units, based on the measurement temperature, and the optical deflector sets an optical axis of incident light into the electro-optical material so as to be orthogonal to the electric field direction, applies between the electrode pair an alternating current voltage on which a direct current bias voltage is superimposed, and thereby deflects the incident light, in which the temperatures of the first and second conductor hold units are controlled so as to give the electro-opti

Abstract: A swept light source of the present invention keeps a coherence length of an output beam long over an entire sweep wavelength range. A gain of a gain medium is changed with time in response to a wavelength sweep and the coherence length is kept maximum. The gain of the gain medium is kept close to a lasing threshold and an unsaturated gain range of the gain medium is narrowed over the entire sweep wavelength range. An SOA current waveform data acquiring method of driving while keeping the coherence length long, a novel coherence length measuring method, and an optical deflector suitable for the swept light source are also disclosed.

Abstract: An electrode pad on a semiconductor substrate having a reduced capacitance of an electrode pad portion and allowing control of a characteristic impedance for a practical electrode pad size is provided.

Abstract: In an optical modulation device (10) having an electrical/optical interaction region (11), an electrical signal line (3) is connected to an electrical signal input terminal (2a), another electrical signal line (4a) is connected to an electrical signal output terminal (2b), and a reflection control circuit (5) is connected to the other electrical signal line (4a). This reflection control circuit (5) is an impedance element which positively reflects an output electrical signal from the interaction region (11) of the optical modulation device (10). This makes it possible to raise the upper-limiting frequency at which the E/O (Electrical-to-Optical) response characteristic can be improved, and improve the flatness of the frequency characteristic of the E/O response without deteriorating the absolute value of the E/O response.

Abstract: An electrode pad on a semiconductor substrate having a reduced capacitance of an electrode pad portion and allowing control of a characteristic impedance for a practical electrode pad size is provided.