Hamamatsu-photonics K.k.

Osaka University

Naota Akikusa

Tadataka Edamura

Atsushi Sugiyama

Kazuue Fujita

Takahide Ochiai

Masamichi Yamanishi

Tatsuo Dougakiuchi

Hirofumi Kan

Mitsuo Hiramatsu

Akira Higuchi

Tokio Takagi

Kousuke Shibata

Gen Takebe

Kunio Awazu

Shinichi Furuta

Katsunori Ishii

A quantum cascade laser device includes a QCL element; a lens; and a lens holder having a small-diameter hole, a large-diameter hole, and a counterbore surface. At least a part of a side surface of the lens is fixed to an inner surface of the large-diameter hole in a state where an edge portion of an incident surface of the lens is in contact with the counterbore surface. A central axis of the small-diameter hole is eccentric from that of the large-diameter hole. The side surface of the lens is positioned with respect to the inner surface of the large-diameter hole along a direction from the central axis of the large-diameter hole toward the central axis of the small-diameter hole. A central axis of the lens is disposed at a position closer to the central axis of the small-diameter hole than to the central axis of the large-diameter hole.

Quantum cascade laser device

An external resonance-type laser module includes: a quantum cascade laser; a MEMS diffraction grating including a movable portion capable of swinging around an axis and a diffraction grating portion formed on the movable portion; a lens; a magnet; and a yoke. The MEMS diffraction grating includes a pair of coils respectively disposed on one side and the other side with respect to the axis when viewed in a normal direction parallel to a normal line of the diffraction grating portion, and each of the pair of coils includes an inside part extending along the axis. A recess portion is formed in the magnet, and at least a part of the recess portion overlaps the inside part when viewed in the normal direction.

External resonance-type laser module

The laser module includes a QCL element, a MEMS diffraction grating, a lens holder for holding a lens disposed between the QCL element and the MEMS diffraction grating, and a package. The package includes a bottom wall, a side wall erected on the bottom wall and formed in an annular shape so as to surround a region in which the QCL element is accommodated, and a top wall closing an opening of the side wall on a side opposite to a side where the bottom wall is disposed. The top wall faces the bottom wall in a direction orthogonal to the optical axis direction of the lens, and the distance between the top wall and a surface of the lens holder on a side where the top wall is disposed is smaller than a thickness of the lens holder along the optical axis direction of the lens.

External resonant laser module

The laser module includes a QCL element, a MEMS diffraction grating, a lens holder holding a lens disposed between the QCL element and the MEMS diffraction grating, a package, an electrode terminal disposed along an inner wall surface of the package, and a wire for electrically connecting the electrode terminal and a coil. The top wall of the package faces the bottom wall of the package in a direction orthogonal to the optical axis direction of the lens. The MEMS diffraction grating includes an electrode pad electrically connected to the coil. The electrode pad is connected to the electrode terminal via the wire. A height position of the electrode pad with respect to the bottom wall is equal to or higher than a height position of the electrode terminal with respect to the bottom wall.

A light source module includes a light source; an optical fiber configured to guide light output from the light source; a pair of holding members configured to hold both ends of a first portion of the optical fiber such that the first portion extends linearly; a first vibrator configured to vibrate the first portion along a first direction intersecting an extending direction of the first portion; and a second vibrator configured to vibrate the first portion along a second direction intersecting the extending direction and differing from the first direction.

Light source module

A quantum cascade laser device has a light-absorbing cover member located between one emission end face of a quantum cascade laser element and an emission window of a housing. The emission end face and an opposing surface of a submount with respect to the cover member are flush with each other. The cover member has an opening at a position opposing the emission end face. The opening has a tapered first opening part increasing its diameter from the emission end face side to the emission window side and a second opening part formed with a fixed diameter not smaller than the smallest diameter of the first opening part.

A wavelength variable light source includes a housing, a heat sink disposed in the housing, an excitation light source disposed on the heat sink and configured to output excitation light, a gain medium disposed on the heat sink and including an active layer and a lower DBR, a MEMS mechanism including a movable film facing the gain medium via a gap, disposed on the gain medium, and configured to control the gap, an upper DBR provided in the movable film and configuring a resonator together with the lower DBR, a reflector configured to reflect the excitation light output from the excitation light source toward the gain medium in the housing, and a window formed in the housing and configured to transmit light output from the gain medium.

Wavelength variable light source

A dental therapy apparatus which enables a dental therapy more surely and less invasively is provided. A dental therapy apparatus (A) comprises a laser light source () emitting laser light (L) having a wavelength within a wavelength region of 5.7 to 6.6 &#x3bc;m; a controller () pulse-driving the laser light source and controlling at least one of pulse width and repetition frequency of pulsed laser light emitted from the laser light source; and an irradiation optical system for irradiating a tooth () including a carious part () with the light emitted from the laser light source. In this dental therapy apparatus, the controller controls at least one of the pulse width and repetition frequency of the pulsed light, so as to selectively cut the carious part ().

Dental therapy apparatus

A quantum cascade laser manufacturing method includes: a step of pressing a mother stamper against a resin film having flexibility to make a resin stamperhaving a second groove pattern P; a step of making a wafer with an active layer formed on a semiconductor substrate; a step of forming a resist filmon a surface on the active layer side of the wafer; a step of pressing the resin stamper against the resist filmby air pressure to form a third groove pattern Pon the resist film; and a step of etching the wafer with the resist filmserving as a mask to form a diffraction grating on a surface of the wafer.

Quantum cascade laser manufacturing method

A quantum cascade laser is configured with a semiconductor substrate and first and second active layers provided in series on the substrate. A unit laminate structure of the first active layer has a subband level structure having an emission upper level and an emission lower level, and is configured so as to be able to generate light of a first frequency &#x3c9;, a unit laminate structure of the second active layer has a subband level structure having a first emission upper level, a second emission upper level, and a plurality of emission lower levels, and is configured so as to be able to generate light of a second frequency &#x3c9;, and light of a difference frequency &#x3c9; is generated by difference frequency generation from the light of the first frequency &#x3c9;and the light of the second frequency &#x3c9;.

Quantum-cascade laser

A quantum cascade laser includes a semiconductor substrate, and an active layer being provided on the substrate, and having a cascade structure in which quantum well emission layers and injection layers are alternately laminated, and the laser has a base portion including the substrate, and a stripe-shaped ridge portion including the active layer. Further, a reflection control film is formed from a ridge end face over a base end face on an end face in a resonating direction of the laser, and, on the base end face, for a second side and a third side adjacent to a first side on the ridge portion side of the base end face, and a fourth side facing the first side, the reflection control film is formed on a region other than regions near those three sides with predetermined widths.

Quantum cascade laser

A quantum cascade laser includes a semiconductor substrate, and an active layer that is provided on the substrate, and has a cascade structure in which emission layers and injection layers are alternately laminated by multistage-laminating unit laminate structures each consisting of the quantum well emission layer and the injection layer, the active layer generates light by intersubband transition in a quantum well structure. Further, in a laser cavity structure for light with a predetermined wavelength to be generated in the active layer, reflection control films including at least one layer of CeOfilm are formed on a first end face and a second end face facing each other. Thereby, it is possible to realize a quantum cascade laser capable of preferably realizing reflectance control for light within a mid-infrared wavelength region on the laser device end face.

A quantum cascade laser includes a semiconductor substrate, and an active layer that is provided on the substrate, and has a cascade structure in which emission layers and injection layers are alternately laminated by multistage-laminating unit laminate structures each consisting of the quantum well emission layer and the injection layer, and generates light by intersubband transition in a quantum well structure. Further, in a laser cavity structure for light with a predetermined wavelength to be generated in the active layer, CeOinsulating films and reflection control films are formed in order on respective faces of a first end face and a second end face facing each other. Thereby, it is possible to realize a quantum cascade laser capable of preferably realizing reflectance control for light within a mid-infrared region on the laser device end face.

A microparticle dispersion liquid manufacturing apparatusincludes a controller, a light source, an irradiation optical system, and a container. A solid objectis contained in and a solventis injected into an interior of the containerto enable attainment of a state where the solid objectis in contact with the solvent. The light sourcerepeatedly outputs pulsed light. By repeatedly irradiating the solventwith the pulsed light from the light source, expansion and contraction of the solventis made to occur repeatedly at the irradiated portion, thereby generating a pressure wave in the solvent, and the pressure wave is made to act on the solid objectto finely pulverize the solid objectand thereby manufacture a microparticle dispersion liquid in which microparticles are dispersed in the solvent. A microparticle dispersion liquid manufacturing method and manufacturing apparatus are thereby realized by which both suppression of impurity formation and an increase in efficiency of microparticle formation can be achieved readily.

Fine-particle dispersion liquid manufacturing method and fine-particle dispersion liquid manufacturing apparatus

A quantum cascade laserincludes a semiconductor substrate, an active layerthat is disposed on the semiconductor substrate and has a cascade structure in which a unit layered structureincluding a quantum well light emitting layer and an injection layer is stacked in multiples to alternately stack the quantum well light emitting layer and the injection layer, and a diffraction grating layerdisposed on the active layer.

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Hamamatsu, Japan

Naota Akikusa