Kabushiki Kaisha Topcon

Topcon Corporation

Taizo Eno

Masayuki Momiuchi

Yoshiaki Goto

Hideo Sagehashi

Noriyasu Kiryuu

Ken-ichiro Yoshino

Shigenori Nagano

Hideki Morita

Kohei Fujita

Yuuichi Yoshimura

Ken-Ichiro Yoshino

The invention provides a laser scanner, which comprises a light source unit, a light receiving unit, a distance measuring unit, an angle measuring unit, a telescope unit capable of rotating in a horizontal direction and a vertical direction, a rotation driving unit, a directional angle detector, and a control arithmetic unit, wherein the light source unit is an MOPA type and has an oscillator control circuit, a main oscillator, and an optical amplifier, wherein the oscillator control circuit has a repetition frequency setting component, a pulse peak output setting component, a pulse width setting component and an amplification factor calculating component and oscillates the main oscillator corresponding to a measured distance, and wherein the amplification factor calculating component calculates an amplification factor based on a repetition frequency, a pulse peak output, and a pulse width and amplifies the optical amplifier based on a calculated amplification factor.

Laser scanner

A surveying instrument comprises a projection optical system for irradiating a distance measuring light which is a linearly-polarized light to an object to be measured, a light receiving optical system for receiving a reflected distance measuring light from the object to be measured, a polarization selecting module for selecting a polarization of the reflected distance measuring light received by the light receiving optical system and an arithmetic control module for controlling a distance measurement based on a light receiving result of the reflected distance measuring light, wherein the arithmetic control module is configured to give a material information to a distance measurement result of the object to be measured based on a change in light receiving amounts caused due to a selection of the polarization by the polarization selecting module.

Surveying instrument

The invention provides a laser light emitting device, which comprises a laser light emitter for emitting a pump light, a resonator for emitting a laser beam by oscillating and amplifying the pump light and a multi-mode fiber for guiding the pump light emitted from the laser light emitter to the resonator, wherein a mode scrambler is provided on the multi-mode fiber, the pump light propagating the multi-mode fiber is stirred and a light intensity distribution is unified by the mode scrambler, and the pump light is entered to the resonator.

Laser light emitting device having a mode scrambler for unifying light intensity distribution

The invention provides a laser surveying device, which comprises a light emitting unit for emitting a pulsed distance measuring light, a photodetection unit for receiving a reflected pulsed distance measuring light and a control arithmetic unit for controlling the light emitting unit and for calculating a distance to an object to be measured based on a photodetection signal from the photodetection unit, wherein the light emitting unit has a pump laser source for emitting a pump laser beam, a spot diameter changing means for changing a spot diameter of the pump laser beam, and an optical cavity for emitting the pump laser beam entering via the spot diameter changing means as the pulsed distance measuring light.

Laser surveying device

A laser oscillation device comprises a light emitting unit for projecting a pump laser beam, a laser medium for absorbing the pump laser beam and for emitting a spontaneous emission light, a saturable absorber for absorbing the spontaneous emission light and for emitting a pulsed light, and a holder for holding the laser medium in a close contact state, wherein a portion of the holder as appressed against at least one surface of the laser medium is made of a metal and the pump laser beam is projected to an edge portion of the laser medium as appressed against the holder.

Laser oscillation device

A technique for selecting two or more wavelengths of output light by a simpler structure is provided. A laser apparatus includes a laser oscillation portion for oscillating laser light; a nonlinear crystal inputting the laser light from the laser oscillation portion as a fundamental wave, the nonlinear crystal converting the fundamental wave into a second harmonic wave and changing conversion efficiency according to a temperature thereof, the nonlinear crystal having a periodically poled structure; and a ratio control means for controlling a ratio of the fundamental wave and the second harmonic wave outputting from the nonlinear crystal by controlling the temperature of the nonlinear crystal.

Laser apparatus and distance measurement apparatus

A distance measuring apparatus for measuring a distance to a target point in a target area comprises a laser oscillator for generating a laser beam having a first wavelength, a nonlinear crystal into which the laser beam having the first wavelength generated by the laser oscillator enters, the nonlinear crystal generating a laser beam having a second wavelength, a collimator lens at which the laser beam having the first wavelength generated by the laser oscillator and the laser beam having the second wavelength generated by the nonlinear crystal are concentrated and are transformed into parallel light flux, a laser device provided with the laser oscillator, the nonlinear crystal, and the collimator lens, an output unit for outputting the laser beam having the first wavelength and the laser beam having the second wavelength at the same time, which are emitted by the laser device, while scanning the target area, a selective reflective mirror for selectively reflecting the laser beam having the first wavelength and the laser beam having the second wavelength that are reflected at the target point in the target area, a first light receiving unit which receives the laser beam having the first wavelength selected at the selective reflective mirror and outputs a first signal, a second light receiving unit which receives the laser beam having the second wavelength selected at the selective reflective mirror and outputs a second signal, and a signal processing unit for measuring the distance to the target point in the target area by selecting one of the first signal and the second signal.

Distance measuring apparatus

A solid-state laser device, comprising two or more resonators for outputting laser beams on a same axis, a first light emitter and a second light emitter for entering excitation light to each of the resonators, a photodetector for monitoring which monitors the outputted laser beams, and a control unit for performing constant output control of at least one of the first light emitter and the second light emitter based on a signal from the photodetector for monitoring.

Solid-state laser device

A solid-state laser device, which comprises a first resonator for projecting a first laser beam and a second resonator for projecting a second laser beam, wherein the first resonator and the second resonator commonly share a part of an optical axis and an output mirror, and which comprises a first light emitting unit for the first resonator, a second light emitting unit for the second resonator, a monitoring means for splitting and monitoring a part of the first laser beam and for splitting and monitoring a part of the second laser beam among the laser beams projected from the output mirror, and a control unit for controlling at least one of the first light emitting unit and the second light emitting unit based on a detection result from the monitoring means.

Solid-state laser device using two resonators on the same axis and dual monitors

A laser device, comprising a laser beam emitter having an optical resonator, wherein the optical resonator has a resonator and a reflection mirror, and at least one of a length of the resonator or a curvature of the reflection mirror is determined so as to satisfy condition that a parameter Mof beam quality of a projected laser beam is within a range of 8&#x2266;M&#x2266;22, where M=&#x3c0;W&#xb7;&#x398;/&#x3bb; (W is a beam waist of a laser beam; &#x398; is a spreading angle; and &#x3bb; is a wavelength of the laser beam).

Laser device and opthalmological surgical system

A laser device for medical treatment system, comprising at least a plurality of laser beam emitting sources, a laser beam multiplexing means for superimposing the laser beams emitted from the laser beam emitting sources, and a beam mixing means where the laser beams from the laser beam multiplexing means enter.

Laser device for medical treatment system

A solid state laser device, comprising a first resonator and a second resonator provided on the same optical axis, a first optical axis of the first resonator, a second optical axis of the second resonator, a first separated optical axis portion being a part of the first optical axis, a second separated optical axis portion being a part of the second optical axis, a common optical axis portion where the first optical axis and the second optical axis are superimposed on each other, a first solid-state laser medium arranged on the separated optical axis portion of the first optical axis, a second solid-state laser medium arranged on the separated optical axis portion of the second optical axis, an optical crystal for wavelength conversion disposed on the common optical axis portion, and a wavelength separating plate for output disposed on one of the separated optical axis portions.

A solid-state laser device, comprising a first resonator arranged on a first optical axis, a second resonator arranged on a second optical axis, a first light emitter for entering an excitation light to the first resonator, a second light emitter for entering an excitation light to the second resonator, and further comprising a separated optical axis portion serving as a part of the first optical axis, a separated optical axis portion serving as a part of the second optical axis, a common optical axis portion where the first optical axis and the second optical axis are superimposed, a first solid-state laser medium arranged on the separated optical axis portion of the first optical axis, a second solid-state laser medium arranged on the separated optical portion of the second optical axis, and an optical member for wavelength conversion and wavelength switching means arranged on the common optical axis portion, wherein the optical member for wavelength conversion comprises a plurality of optical crystals for wavelength conversion having different conversion frequencies, and the wavelength switching means can change the optical crystals for wavelength conversion where a laser beam enters.

A solid-state laser device, comprising a first resonator arranged on a first optical axis, a second resonator arranged on a second optical axis, a first light emitter for entering an excitation light to the first resonator, a second light emitter for entering an excitation light to the second resonator, a common optical axis portion commonly used by the first optical axis and the second optical axis, a wavelength separating plate for separating the first optical axis from the second optical axis so that the common optical axis portion can be commonly used by the optical axes, an output portion provided on the common optical axis portion, a first solid-state laser medium arranged on a separated optical axis of the first optical axis, a second solid-state laser medium arranged on a separated optical axis of the second optical axis, and an optical crystal for wavelength conversion arranged on the common optical axis portion.

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Tokyo-to, Japan

Taizo Eno