Hitachi, Ltd.

Oclaro Japan, Inc.

Hitachi Consumer Electronics Co., Ltd.

University of California

Hitachi-high-technologies Corporation

Japan Science and Technology Agency

The University of Tokyo

Hideharu Mikami

Harukazu Miyamoto

Kentaro Osawa

Takeshi Shimano

Takahiro Kurokawa

Koichi Watanabe

Keisuke Goda

Hiroyuki Minemura

Yumiko Anzai

Bruce J Tromberg

Nobuhiro Shiramizu

Takuma Ban

Jiro Hashizume

Taichi Kogure

Koki Iemura

Eric Olaf Potma

Yasuyuki Ozeki

Mihaela Balu

A flow cytometer including a flow cell in which an imaging object flows; a laser beam irradiator configured to radiate laser beam; a camera including an image sensor of N&#xd7;M pixels; and an optical system configured to introduce the laser beam from the laser beam irradiator to imaging range of flow cell and to introduce signal light, such as transmitted, reflected or scattered light, from imaging range of flow cell, to camera. Optical system includes a mirror device that is placed on a Fourier plane of imaging optical system, that has at least one mirror specularly reflecting the signal light, and that is driven and rotated in conjunction with a flow in flow cell, such that each part of an image formed by the signal light is introduced into an identical pixel of the image sensor for at least a predetermined time period from a predetermined timing.

Flow cytometer

Provided are an irradiation device, a laser microscope system, an irradiation method, and a laser microscope detection method which can further widen a bandwidth of detection light as a multiplexed signal. Laser light beams are separated and enter a first AOD () and a second AOD () so that a plurality of first diffracted light beams and a plurality of second diffracted light beams with deflection angles and sizes of frequency shifts different from each other are generated. The first diffracted light beams and the second diffracted light beams are superposed by a beam splitter () so as to generate a plurality of interference light beams with beat frequencies different from each other. An objective lens () is formed by aligning a plurality of irradiation spots of interference light beam linearly in a main scanning direction and irradiates a sample (T) with the interference light beam. The irradiation spot is moved by oscillation of a scanning mirror () in a sub scanning direction orthogonal to the main scanning direction. Fluorescence emitted from the sample (T) by irradiation of each interference light beam is detected by a light detection unit ().

Irradiation device, laser microscope system, irradiation method, and laser microscope detection method

In a multi-color CARS microscope, it has been difficult to accurately bring optical axes of pump light and Stokes light into correspondence and to stably acquire a spectral signal. Accordingly, in an optical analysis device, CARS light is generated from, a sample by using a residual component of the pump light introduced to an optical waveguide and the Stokes light generated in an optical waveguide.

Optical analysis device and biomolecular analysis device

A multiphoton microscope based on two-photon excited fluorescence and second-harmonic generation that images FOVs of about 0.8 mm(without stitching adjacent FOVs) at speeds of 10 frames/second (800&#xd7;800 pixels) with lateral and axial resolutions of 0.5 &#x3bc;m and 2.5 &#x3bc;m, respectively. The scan head of the instrument includes a fast galvanometric scanner, relay optics, a beam expander and a high NA objective lens. The system is based on a 25&#xd7;, 1.05 NA water immersion lens, which features a long working distance of 1 mm. A proper tailoring of the beam expander, which consists of the scan and tube lens elements, enables scaling of the FOV. The system and method also include a flat wavefront of the beam, minimum field curvature, and suppressed spherical aberrations. All aberrations in focus are below the Marechal criterion of 0.07&#x3bb; rms for diffraction-limited performance.

Imaging platform based on nonlinear optical microscopy for rapid scanning large areas of tissue

The terahertz wave measuring device includes a pulsed laser light generation unit, a seed light generation unit, a terahertz wave generatorthat generates terahertz waves, a terahertz wave detectoron which the terahertz waves that are generated from the terahertz wave generator and that have interacted with a measurement objectand the pump light are incident and that generates terahertz wave detection light, an interference optical systemthat multiplexes the terahertz wave detection light and reference lightof the same wavelength as the terahertz wave detection light to generate a plurality of interfering light beams, a plurality of light detectorsthat detect the interfering light beams, and a signal processing unitthat outputs an intensity signal and/or a phase signal of the terahertz waves by performing arithmetic operations on the outputs of the plurality of light detectors.

Terahertz wave measuring device

A microscope includes: a first light dividing part that divides a light flux of light from a light source into a first pump light flux and a second pump light flux; a Stokes light source that receives the second pump light flux as an input and outputs a Stokes light flux; a multiplexing part that multiplexes the first pump light flux and the Stokes light flux to generate a multiplexed light flux; a first light-collecting part that collects the multiplexed light flux in a sample; a first detector that detects CARS light generated from the sample, the CARS light having a wavelength different from the multiplexed light flux; a second light dividing part that lets at least one of the second pump light flux and the Stokes light flux branch partially as a reference light flux; a second multiplexing part that multiplexes a light flux from the sample and the reference light flux to generate interfering light; and a second detector that detects the interfering light.

Cars microscope

Provided is an optical receiver including a first delay interferometer, a second delay interferometer, and an input light splitting portion for inputting modulated light. The first delay interferometer includes a first light splitting portion for splitting the input light into first light and second light, a first reflecting portion and a second reflecting portion for causing the first light and the second light to return to the first light splitting portion. The second delay interferometer includes a second light splitting portion for splitting the input light into third light and fourth light, a third reflecting portion and a fourth reflecting portion for causing the third light and the fourth light to return to the second light splitting portion. A region between the first light splitting portion and the second reflecting portion intersects with a region between the second light splitting portion and the fourth reflecting portion.

Optical receiver

The present invention provides a small and inexpensive optical element that integrates a reflecting mirror and a wave plate function. A reflecting wave plate is configured by arranging a periodic metal comb-like structure whose pitch is equal to or below a wavelength and a mirror structure with a distance equal to or below a coherence length.

Optical element and optical apparatus

When designing a demodulator for a DPSK-modulated signal, it is required that optical phase modulation is performed fast and the demodulator has a long lifetime. To achieve this object, a delay line interferometer inside the demodulator performs adjustment of phase difference between two split lights caused to interfere, using a first optical phase modulation unit such as a Piezo actuator and a second optical phase modulation unit such as a heating element that operates slower in modulation speed than the first optical phase modulation unit and is slower in deterioration speed.

Interferometer, demodulator, and optical communication module

In a free space optical system type demodulator of a phase shift keying signal, if a half beam splitter is used as a non-polarizing optical branching unit that is used when generating beams corresponding to I and Q channels or when multiplexing an interference light, control of a power branching ratio is difficult, and it is necessary to suppress phase shifts that are different depending on a polarization state of an input state, and thereby the demodulator becomes high cost. Moreover, since directions of branched lights are different, it is difficult to suppress a skew of the demodulator. In the present invention, the non-polarizing optical branching unit that is used when generating the beams corresponding to the I and Q channels and when multiplexing the interference light is realized using polarization rotating elements and polarization separating elements. Moreover, branched beams are substantially aligned.

Demodulator and optical transceiver

A delay interferometer includes a half beam splitter and two pentagonal prisms disposed on a substrate. The half beam splitter branches light to be measured which travels substantially in parallel with the substrate into two branched light beams. The pentagonal prisms respectively reflect the respective branched light beams such that the optical axes of the branched light beams are moved in parallel in a direction substantially perpendicular to the substrate by reflection. The half beam splitter combines the branched light beams reflected by the pentagonal prisms to generate interference light beams.

Interferometer including elements that reflect beams moved in parallel in a direction substantially perpendicular to a substrate by reflection

Multi-level recording is quite effective for attaining a larger capacity and a higher transfer rate in the case of an optical disk; however, with conventional technologies, a SIGNAL-TO-NOISE RATIO of a signal deteriorates along with an increase in a multi-level degree, creating a factor for limitations to the multi-level degree. In order to solve problems, when optical information is recorded by use of a standing wave occurring due to interference between two light beams, at least one of the two light beams is modulated in multi-stages. Further, at the time of regeneration, a regeneration reference beam is caused to interfere with respective polarization components of a regeneration beam, the polarization components being orthogonal to each other, thereby concurrently generating not less than three interference beams differing in interference phase from each other before being detected.

Optical information reproducing device, optical information recording device, and method for recording optical information

In a delay line interferometer inside a demodulator, with respect to polarization states of two split beams of light to be interfered with each other, p polarization and s polarization are reversed by a half beam splitter and, further, again multiplexed by the half beam splitter used for splitting so that interference beams of light are generated.

Interferometer, demodulator, and optical fiber communication module

In a system of detecting an interference light with a light not irradiated onto an optical disc to increase the S/N ratio, it is difficult to stably acquire a reproduced signal with a simple configuration. Since the recording density is not improved, an improvement in transfer rate is difficult. In an optical information recording/reproducing apparatus where two optical beams face each other and are focused at the same place of a recording medium to record a standing wave developed by interference of the two optical beams, a phase difference of the two optical beams is modulated in a multiple stage and recorded. During reproduction, an interference light of a reproduced light from the recording medium and another reproduction reference light is detected as a reproduced signal, and a phase servo control stabilizing the phase of interference during reproduction by using a low frequency component of the reproduced signal is conducted.

Optical information recording/reproducing apparatus and optical information reproducing apparatus

A polarization diversity optical system device includes: a polarization split unit that splits a first coherent light into a first split light and a second split light whose polarization components are orthogonal to each other, and splits a second coherent light into a third split light and a fourth split light whose polarization components are orthogonal to each other; and a light combining unit that combines the first split light with one of the third split light and the fourth split light, and combines the second split light with the other of the third split light and the fourth split light.

Growing community of inventors

Kawasaki, Japan

Hideharu Mikami