Mitsubishi Electric Corporation

Yosuke Akino

Takayuki Yanagisawa

Yoshihito Hirano

Shuhei Yamamoto

Toshiyuki Ando

Kyosuke Kuramoto

Tsutomu Nagatsuka

Kohei Sakai

Takeshi Sakimura

Fumio Shohda

Fumio Shoda

Hidenori Fukahori

Hisamichi Tanaka

Yasuhiro Hinokuma

Disclosed is a laser light transceiver which is configured so as to include a polarization changing unitfor outputting a laser light beam outputted from a transmission light sourcetoward a direction corresponding to the polarization of the laser light beam while changing the polarization of the laser light beam with respect to time. As a result, the laser light transceiver can transmit a laser light beam, whose power is not decreased, in two eye directions without mechanically scanning with the laser light beam.

Laser radar device

The multi wavelength laser device includes a laser light sourcethat emits a plurality of laser lightswhose fundamental wavelengths differ from one another, a dispersing elementthat changes the traveling direction of each of the plurality of laser lights according to the wavelength and the incidence direction, and that emits the laser lights in a state in which the laser lights are superposed on the same axis, and a wavelength conversion elementthat has a plurality of polarization layers disposed therein and having different periods, and that performs wavelength conversion on the fundamental wave laser lights emitted from the dispersing elementand placed in the state in which the laser lights are superposed on the same axis, and emits a plurality of laser lightsacquired through the wavelength conversion in a state in which the laser lights are superposed on the same axis.

Multi wavelength laser device

A ray of lightenters vertically to an incident surfaceof a rod integratorwhile another ray of lightenters obliquely to the incident surfaceof the rod integratorAs a result, the outermost spread angle of the ray of lightafter entering the rod integratorcoincides the outermost spread angle of the ray of lightafter entering the rod integrator

Light homogenization device

A laser includes a wavelength selecting elementthat selectively reflects laser beams with wavelengths &#x3bb;=&#x3bb;, &#x3bb;, &#x3bb;, . . . , &#x3bb;(n&#x2267;1) of different laser oscillation modes from among fundamental oscillation wavelengths of laser beams passing through a wavelength conversion element, and the wavelength conversion elementthat converts the laser beams with the wavelengths &#x3bb;=&#x3bb;, &#x3bb;, &#x3bb;, . . . , &#x3bb;(n&#x2267;1) of different laser oscillation modes reflected by the wavelength selecting elementto harmonics. When using a material with a wide gain band as a laser mediumof a solid-state laser element, a waveguide laser is implemented capable of carrying out high-efficiency wavelength conversion at a plurality of wavelengths within the gain band.

Waveguide laser

Provided is a passively Q-switched element or the like, which enables mode selection without increasing the number of components in a resonator in a Q-switched pulse laser or the like that oscillates in a great number of high-order modes and which is also applicable to a waveguide type laser in which a mode cannot be controlled spatially. By combining a saturable absorber () with a transparent material () which is transparent to a laser oscillation wavelength or the like, a passively Q-switched element having a mode selection function and a passively Q-switched laser device in which a passively Q-switched element has a mode selection function, and a planar waveguide type passively Q-switched element and passively Q-switched laser device are provided.

Passively Q-switched element and passively Q-switched laser device

A waveguide is constructed by sandwiching a transparent member () and a laser medium () between a first clad-and a second clad-. Pumping light () is made to be incident from a direction perpendicular to a direction of the optical axes of first to fourth laser oscillation light beams-to-, and to alternately propagate through the transparent member () and the laser medium () in a zigzag manner so as to pump only resonator mode regions in the laser medium ().

Planar waveguide laser pumping module and planar waveguide wavelength conversion laser device

A plane waveguide type laser includes: a plate-shaped laser medium; a semiconductor laser which causes excitation light to enter an end surface of the laser medium; first and second claddings which are bonded to lower and upper surfaces of the laser medium, respectively, to form a waveguide in a vertical direction; a comb heat sink bonded to a lower surface of the first cladding; and a thermal lens producing portion bonded to an upper surface of the second cladding. In this structure, laser oscillation in the vertical direction is performed in a waveguide mode of the laser medium, and the thermal lens producing portion forms a periodic lens effect in the laser medium to perform laser oscillation in a lateral direction in a plurality of resonant modes.

Plane waveguide type laser and display device

An optical wavelength conversion element includes: a wavelength conversion waveguide that has a periodic polarization reversal structure having alternately and cyclically formed domains of which polarization directions are inverted, that guides light as a fundamental wave corresponding to the periodic polarization reversal structure, and performs a wavelength conversion of the guided fundamental wave; a first clad that is made of a dielectric having a refractive index lower than that of the wavelength conversion waveguide and is provided in contact with the domains; a second clad that is made of a dielectric having a refractive index lower than that of the wavelength conversion waveguide and is provided in contact with the domains such that the second clad is opposed to the first clad film; a first conducting unit that electrically connects the domains in parallel via the first clad; and a second conducting unit that electrically connects the domains in parallel via the second clad.

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Tokyo, Japan

Yosuke Akino