Hamamatsu-photonics K.k.

Hamamatsu Photonics Kabushiki Kaisha

Other

Virginia Tech Intellectual Properties Inc

Kazunori Shinoda

Yoshiji Suzuki

Xin Gao

Ting-Chung Poon

Ming Hsien Wu

Hiroshi Okamoto

Katsuyuki Kinoshita

Tsutomu Hara

Koji Ichie

Yoshiharu Ooi

Masaru Sugiyama

Masayuki Saitoh

Hiroyuki Ohashi

Kouichiro Ooba

A beam-condensing unit has a first light source, a second light source, and a condenser mirror. The first and second light sources output a plurality of first and second light fluxes arrayed along a first direction, respectively. A condenser mirror has first and second optical plates that intersect with each other. The first optical plate includes a plurality of first reflecting portions that are arrayed along the first direction and reflect the first light fluxes, respectively. The second optical plate includes a plurality of second reflecting portions that are arrayed along the first direction alternately with the first reflecting portions and reflect the second light fluxes, respectively.

Light collecting device and light collecting mirror

Refracting optical systemandrelatively shift the second laser beam groups together with respect to the first laser beam groups along the layering direction. The transmission/reflecting optical system for alignmentR,R,S andS are used, so that the laser beam patterns comprised of the first and second laser beam groups which are emitted from the transmission/reflecting optical systemsR,R,S andS are shaped to be long in the layering direction of the laser bar, and since separate optical systems are used for shift and alignment, respectively, an individual optical system has a simple configuration.

Laser light source and an optical system for shaping light from a laser-bar-stack

The twin-image elimination apparatus of the present invention comprises (a) a scanning light source for emitting a scanning light beam; (b) an interference device which converts the scanning light beam from the scanning light source into a spherical wave and a plane wave having temporal frequencies different from each other and combines the spherical and plane waves together; (c) a scanner for scanning an object with the combined light beam from the interference device; (d) a photodetector for detecting a scattered wave from the object; (e) a first multiplier which converts an output signal of the photodetector into a cosine-coded holographic information; (f) a second multiplier which converts the output signal of the photodetector into a sine-coded holographic information; and (g) a holographic reconstruction device which converts output signals of the first and second multipliers into a sum signal, in which these output signals are added together with a phase difference of .pi./2+2n.pi. (wherein n is an integer not less than 0), so as to reproduce an image of the object without the presence of its twin image. Hence, at the time of reconstructing a hologram, the virtual image component contained in the output signal of the photodetector can be removed, thereby improving the image quality of the reconstructed image.

Twin-image elimination apparatus and method

There is disclosed an optical heterodyne scanning holography device capable of recording and reconstructing a holographic image of an object in real time by optical heterodyne-scanning the object, capturing a scattered wave from the object by a photodetector, and converting a heterodyne output current from the photodetector to a spatial light modulator for coherent processing optically.

Optical heterodyne scanning type holography device

A crystal structure arrangement used in a spatial light modulator wherein an electrooptic crystal structure faces an electron beam source, such as a photocathode or an electron gun, within a vacuum envelope. Electrons emitted from the electron beam source in response to an image or image signal source are stored on the surface of the electrooptic crystal structure to form a charge image thereon and then to change the refractive index of the electrooptic crystal structure corresponding to the stored charge image. The refractive index change is read out using a laser beam or incandescent light beam.

Spatial light modulator

A synchronous scan streaking device comprising a photoelectric layer, an electronic lens, an anode with an aperture, a pair of deflection electrodes, and a phosphor layer arranged in order within a vacuum envelope. A deflection voltage at the same frequency as the repetition rate of the light pulses incident on the phosphor layer to be measured is fed from deflection voltage generation means to the deflection electrodes so as to repetitively generate an enhanced image of the incident light on the phosphor layer. At least one shielding metal structure which is connected to the common potential source is arranged in the space between the deflection electrode plate and the wall of the envelope, and surrounding a deflection electrode plate lead provided to connect the deflection electrode plate through the envelope to the deflection voltage generation means.

Synchronous scan streaking device

Growing community of inventors

Hamamatsu, Japan

Kazunori Shinoda