Mitsubishi Electric Corporation

Takeshi Sakimura

Takayuki Yanagisawa

Yojiro Watanabe

Yoshihito Hirano

Shumpei Kameyama

Toshiyuki Ando

Kohei Sakai

Yosuke Akino

Yukari Takada

Fumio Shoda

Hisamichi Tanaka

Yuhi Kono

Takuya Takasaki

Yasuhiro Hinokuma

Narito Samejima

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

There are provided: a planar waveguide in which claddings () and () each having a smaller refractive index than a laser medium for absorbing pump light () are bonded to an upper surface () and a lower surface () of a core () which is formed from the laser medium; pump light generation sources () and () for emitting pump light () to side surfaces () and () of the core (); and laser light high reflection films () and () formed on side surfaces () and () of the core (). Each of side surfaces () and () of the cladding () corresponding to the side surfaces () and () of the core () has a ridge structure () in which a part thereof is recessed.

Planar waveguide laser apparatus

An object is to provide an optical device capable of relaxing a manufacturing condition for an optical waveguide used in the optical device. An optical deviceis provided with an optical waveguideincluding a core and a cladding optically joined together, and a temperature controllerthat controls temperature of the optical waveguide, wherein the optical waveguide includes the core and the cladding formed such that a normalized frequency specified for light propagating through the optical waveguide changes across a cutoff frequency of a guided mode determined from a structure of the optical waveguide in a temperature range in which a refractive index of the core is higher than a refractive index of the clad. The temperature controller controls the temperature of the optical waveguide over a temperature range across temperature at which the normalized frequency equals to the cutoff frequency.

Optical device

A configuration is provided with a laser mediumof a refractive index nc that is an isotropic medium and includes an upper surface and a lower surface, where at least one of the upper surface and the lower surface is bonded with a claddinghaving a refractive index satisfying a relationship of no&#x3c;nc&#x3c;ne or ne&#x3c;nc&#x3c;no. This allows selective output of only polarized light generated by a refractive index in the claddingsmaller than the refractive index nc at a desired wavelength (e.g. 1535 nm) which can be implemented by using the isotropic medium.

Flat waveguide-type laser device

Plural signal beams enter a planar waveguide laser amplifier from different directions to follow different paths therein, which reduces a region not contributing to amplification where no signal beam passes. Plural signal beams follow different paths in the planar waveguide, and a second signal beam utilizes the gain of a portion of the planar waveguide that a first signal beam cannot utilize. By this configuration, a region not contributing to amplification of the signal beams in the planar waveguide laser amplifier can be reduced, causing to efficiently amplify plural signal beams.

Laser amplification device

A lidar includes CW laser light sources that oscillate CW laser light rays with wavelengths different from each other; an optical multiplexing coupler that mixes the CW laser light rays oscillated by the CW laser light sources; an optical branching coupler that splits the CW laser light passing through the mixing by the optical multiplexing coupler; a light modulator that modulates first CW laser light split by the optical branching coupler; and an optical fiber amplifier that amplifies the laser light modulated by the light modulator, in which a transmit-receive optical system irradiates a target with the laser light amplified by the optical fiber amplifier, and receives scattered light of the laser light by the target.

Growing community of inventors

Tokyo, Japan

Takeshi Sakimura