Nagoya University

Sekisui Medical Co., Ltd.

Aisin Seiki Kabushiki Kaisha

Osaka University

Nagoya Industrial Science Research Institute

Canon Kabushiki Kaisha

Nu Eco Engineering Co., Ltd.

Japan Science and Technology Agency

Japan Science and Technology Corporation

Tokyo Seimitsu Co., Ltd.

Norihiko Nishizawa

Toshio Goto

Kazuyoshi Itoh

Hideki Tomita

Tetsuo Iguchi

Yasuyuki Ozeki

Akira Ideno

Toshinari Oh-Hara

Masaru Hori

Hiroyuki Kano

Kiichi Fukui

Masafumi Ito

Shinichiro Kajiyama

Ryohei Terabayashi

Fumihiro Dake

Yuma Kitagawa

Kazuhiko Sumimura

Youta Ito

Atsushi Sato

Tsuyoshi Inoue

Hiroaki Adachi

Kazufumi Takano

Shigeru Sugiyama

Atsushi Satou

Hiroyoshi Matsumura

Masatoshi Arai

Volker Sonnenschein

Yuusuke Mori

Shutaro Ishida

Murakami Satoshi

Takahiro Hirotsu

Satoshi Yuruzume

Tomohiro Aoto

Provided is a carbon isotope analysis device including a carbon dioxide isotope generator provided with a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometer including optical resonators having a pair of mirrors, and a photodetector that determines intensity of light transmitted from the optical resonators; and a light generator including a single light source, a first optical fiber that transmits first light from the light source, a second optical fiber that generates second light of a longer wavelength than the first light, the second optical fiber splitting from the first optical fiber and coupling therewith downstream, a first amplifier on the first optical fiber, a second amplifier on the second optical fiber, different in band from the first amplifier, and a nonlinear optical crystal.

Light generating device, and carbon isotope analyzing device and carbon isotope analyzing method employing same

A method and apparatus for analyzing carbon isotopeC is provided. A carbon isotope analyzer including an isotopic carbon dioxide generator to generate isotopic carbon dioxide from a carbon isotope; a spectrometer including an optical resonator having a pair of mirrors, and a photodetector to determine the intensity of light transmitted from the optical resonator; and a light generator including a light source, a first optical fiber to transmit a light beam from the light source, a second optical fiber for wavelength conversion, the second optical fiber branching from the first optical fiber at a point and combining with the first optical fiber at another point downstream of the branching point, and a non-linear optical crystal to generate light having the absorption wavelength of the isotopic carbon dioxide on the basis of the difference in frequency between light beams transmitted through the optical crystal.

Carbon isotope analysis device and carbon isotope analysis method

A carbon isotope analyzerincludes a carbon dioxide isotope generatorthat includes a combustion unit that generates gas containing carbon dioxide isotope from carbon isotope, and a carbon dioxide isotope purifying unit; a spectrometerincluding an optical resonatorhaving a pair of mirrors, and a photodetectorthat determines the intensity of light transmitted from the optical resonator; and a light generatorincluding a light source, a first optical fiberto transmit a light beam from the light source, a second optical fiberfor wavelength conversion, the second optical fibersplitting from the first optical fiberat a point and combining with the first optical fiberat another point downstream of the splitting point, and a non-linear optical crystalthat generates light having the absorption wavelength of the carbon dioxide isotope on the basis of the difference in frequency between light beams transmitted through the optical crystal. The carbon isotope analyzeris a simple and convenient apparatus that can analyze isotopeC.

Provided are a method for observing protein crystal, wherein the growth process of the protein crystals is nondestructively and three-dimensionally monitored on a real-time basis and the growth of the crystals is controlled at a high accuracy to thereby enable the formation of single crystals having good qualities, which comprises observing the protein crystals, said protein crystals having been produced by a crystallization method using a gel, by an OCT measurement using light emitted from an ultrawideband light source; a method for observing protein crystals wherein the ultrawideband light source is an ultrawideband supercontinuum light source; a method for observing protein crystals wherein the center wavelength of the light emitted from the ultrawideband supercontinuum light source is a 0.8 &#x3bc;m band; and a method for observing protein crystals wherein the monitoring of the protein crystals is a monitoring by an in situ measurement.

Method for observing protein crystal

An optical microscope that can prevent an increase in the complexity of the light source system is equipped with optics readily capable of adequate operation even when the modulation frequency is increased to reduce the impact of the intensity noise of the laser. The optical microscope irradiates a sample with a first train of optical pulses having a first optical frequency, which is generated by a first light source, and a second train of optical pulses having a second optical frequency, which is temporally synchronized with the first train of optical pulses and is generated by a second light source, and detects light scattered from the sample. A first repetition frequency of the first train of optical pulses is an integral sub-multiple of a second repetition frequency of the second train of optical pulses.

Optical microscope and optical instrumentation

The present invention provides a method for narrowing a spectral width that can also be adapted to an ultrashort optical pulse emitted from a wavelength tunable light source, and that can provide an output optical pulse with a narrow spectral width and a low noise component, and an optical element and a light source device that use the method for narrowing a spectral width. The method includes using an optical waveguide member () to cause a soliton effect in an input optical pulse () within the optical waveguide member (), thereby narrowing a spectral width of the input optical pulse () to provide an output optical pulse (), the optical waveguide member () having dispersion characteristics such that the average of a second-order dispersion value (&#x3b2;) with respect to the input optical pulse () is negative, and the absolute value of the second-order dispersion value (&#x3b2;) increases in a propagation direction of the input optical pulse ().

Spectral width narrowing method, optical element and light source device

The invention provides an optical microscope that prevents an increase in the complexity of the light source system and is equipped with optics readily capable of adequate operation even when the modulation frequency is increased in order to reduce the impact of the intensity noise of the laser, etc. This optical microscopeirradiates a samplewith a first train of optical pulses having a first optical frequency, which is generated by a first light source, and a second train of optical pulses having a second optical frequency, which is temporally synchronized with the first train of optical pulses and is generated by a second light source, and detects light scattered from the sample. The repetition frequency of the train of optical pulses generated by the first light source is an integral sub-multiple of the repetition frequency of the train of optical pulses generated by the second light source.

A spectroscopy method, includes guiding pulse laser light to an optical fiber, which mutually reacts with a sample to be measured of a light absorptance characteristic, outputting ring down pulse light obtained through light absorption of the sample, measuring an absorptance characteristic of the sample based on an attenuation characteristic of the ring down pulse light, and setting the pulse laser light as wide-spectrum laser light, setting the optical fiber as a strong dispersive optical fiber, and increasing a pulse width of the ring down pulse light to measure a wavelength absorptance characteristic based on a ring down attenuation constant of a pulse train with respect to a time sequence corresponding to a wavelength.

Spectroscopy method and spectroscope

A dimension measuring apparatus includes a light beam splitting element for splitting light emitted from a white light source into measuring light flux and reference light flux, a reference light scanning optics for varying optical path length of the reference light flux, a detector for detecting interference signal produced by the light fluxes, and a controller for determining the surface height of the object from the optical path length of the reference light flux corresponding to maximum value of the interference signal. The reference light scanning optics includes a rotary member, first and second reflective elements disposed to be symmetrical with respect to the rotation axis of the rotary member, and light beam deflecting members that direct the reference light flux to be incident on the first reflective element along the direction parallel and opposite to the incident direction of the reference light flux on the second reflective element.

Dimension measuring apparatus

To achieve an apparatus capable of measuring a light absorption coefficient f a sample with high sensitivity. A ring down spectroscope uses a wavelength-variable femtosecond soliton pulse light source. Pulse light is input to a loop optical fiberthrough a first light waveguideand a wavelength selective switch. Ring down pulse light is input to a homodyne detector through the wavelength selective switch. On the other hand, pulse light propagating in the first light waveguideis split and input to light waveguides constituting a second light waveguidethrough an optical directional couplerand a first optical switching element. The pulse light propagating in the second light waveguideis input to the homodyne detector as reference light and used for synchronous detection. The plural light waveguides constituting the second light waveguidediffer in optical length in accordance with the length of the optical fiber, and can slightly change the optical length.

A distance measurement device that provides high speed and accuracy. A light divider separates pulsed light emitted from an ultrashort pulse fiber laser into reference light A and signal light. A scanning mirror unit irradiates an object with the signal light and receives scattered light B, which is reflected from the object. An optical path length adjustment unit adjusts an optical path length of the reference light A. A differential detector detects the degree of interference of the reference light A having the adjusted optical path length with the scattered light B and outputs the detected degree of interference as an interference signal. A computer specifies an adjustment value, set in the optical path length adjustment unit, to attain a specific optical path length maximizing the interference signal and uses the specified adjustment value to compute the distance from the scanning mirror unit to the object.

Distance measurement device and distance measurement method

A broadband optical spectrum generating apparatusincludes a ultrashort pulsed fiber laserthat generates pulsed light having a pulse width in the unit of picosecond to femtosecond, and broadband optical spectrum-generating optical fibersthat are connected with the ultrashort pulse fiber laservia a lensand have characteristics of normal dispersion, that is, a nonlinear coefficient of not less than 10 [Wkm] and a magnitude of wavelength dispersion of not greater than a value 0 [ps/km/nm] with regard to a wavelength of the pulsed light. The resulting output is super continuum that is widely broadened to a wavelength band of 1400 nm to 1750 nm and is chirped to a linear characteristic.

Broadband optical spectrum generating apparatus and pulsed light generating apparatus

An apparatus and method for generating a wavelength-tunable short pulse that can generate wavelength-tunable short pulsed light in the visible-light wavelength band are provided. When ultrashort pulsed light is introduced into an optical fiber (), a wavelength-tunable ultrashort soliton pulse is generated by a nonlinear optical effect through the soliton effect and Raman scattering. When the soliton pulse has a short duration and high peak intensity, a third harmonic having one-third of the wavelength of the soliton pulsed light is generated by a third nonlinear optical effect. This third harmonic has a short wavelength in the visible light band.

Wavelength-variable short pulse generating device and method

Growing community of inventors

Nagoya, Japan

Norihiko Nishizawa