Abstract: A light source device that converts a beam of light radiated from an optical fiber-type second-harmonic generating element to a parallel beam of light filled with a bundle of rays up to a central portion of the parallel beam by causing a portion of the beam of light to pass through an apex of a conical surface. The light source device is unlikely to be affected by the spherical aberrations of members constituting an optical system such as lenses, which makes it unnecessary to make the component members of the optical sysem special, thereby simplifying the optical system.

Abstract: A method for the production of a thin film on an end surface of a fiber made up of a core of an organic material, and a clad made of glass. This method involves the steps of placing the fiber in a vacuum chamber, reducing the pressure in the chamber, cutting the fiber under reduced pressure, and either simultaneously, or immediately after cutting the fiber, forming a thin film on the cut surface of the fiber.

Abstract: An intravascular laser operating device and method for examining and removing a diseased part in a blood vessel. The device includes a catheter having endoscopic fibers for performing an endoscopy and diagnostic of a diseased part in a blood vessel and laser light projecting fibers for projecting a laser light, a visible guide light, and an excited light to the diseased part. An laser device applies laser light to converting elements. A first wave length converting element converts part of the laser light into the visible guide light, and a second wave length converting element converts a part of the visible guide light into the excited light. The excited light is used for generating a fluorescent spectrum. An image is received representing the condition of the inside of the blood vessel based on image light received by the endoscopic fibers. A spectrum analyzing unit diagnoses the diseased part by obtaining the components of the fluorescent spectrum of the received image light.

Abstract: This invention relates to an intracavitary laser operating device using a laser.The device, has a catheter (2) accommodating laser light projecting fibers, a pulse laser oscillator device (1), an acoustic detector (4) detecting the acoustic wave generated from the diseased portion, an acoustic analyzer (5) analyzing the acoustic wave from the acoustic detector (4) and obtaining the amplitude change data and spectrum data of the acoustic wave, and a controller (7) for calculating the optimum condition of the projection of the laser light to be projected to the diseased part depending on the data from the acoustic analyzer (5) and controlling the pulse laser oscillator device (1) based on said optimum condition of the projection.

Abstract: A method of coating the ends of a fiber wavelength-conversion element with a macromolecular film. This serves to protect the crystal core and change in quality without changing the state of the core end surface.

Abstract: A fibre-type light conversion device for converting the wavelength of an incident light comprises a core and a cladding layer provided around the core. An end surface of the device from which the light beam radiates is made conical, so that the second harmonic wave is collimated without using any additional optical element such as a conical prism. The end surface of the device is formed by a process in which the end surface of the device is polished with a central axis of the device being held at a predetermined angle with respect to a polishing surface while the device is rotated about the central axis.

Abstract: A fiber type wavelength converter comprising a cladding made of a thin glass tube an inner wall of which is coated with a coupling agent, and a core which is contained in the cladding and made of a single crystal of methyl 4-hydroxybenzoate, which can convert a fundamental wave to a second harmonic effectively.

Abstract: A device for generating a second harmonic from a laser source is disclosed. The light from the laser passes through an optical fiber in which the second harmonic is generated. The light exiting from the optical fiber has a conical wave surface which is incident upon a collimating lens. Because the collimating lens has a diffraction lattice formed thereon, it is easy and efficient to collimate the second harmonic. It is also possible to decrease the size of the apparatus due to the use of the diffraction lattice formed on the collimator lens. This enable such a device to be particularly useful with a small sized light source such as a semiconductor laser.

Abstract: An arrangement for generating light at a second harmonic of an input light at a fundamental frequency/wavelength. Light at the fundamental frequency/wavelength is generated by a laser and impinges upon an input end of an optical fiber. The optical fiber has a non-linear optical characteristic and generates a second harmonic of the input light. The second harmonic which exits the fiber has an axisymmetrical and conical equiphase wave surface. A collimator lens collimates the second harmonic and parallel light rays are produced on the output side of the lens.

Abstract: A fiber wavelength modulator device which emits a secondary harmonic component by Cerenkov radiation, including a core being a single crystal of a non-linear optical material and a cladding being composed of glass, wherein the relative difference between the core and the cladding has a refraction index with respect to an incident beam, of at lesat 0.015.

Abstract: An elastomeric optical waveguide comprising a core and a cladding surrounding the core in which at least the core comprises an elastomer to which elasticity is imparted by irradiation of a radioactive ray, which has low attenuation of light transmission.

Abstract: A cross-linked optical siloxane polymer having a group for modifying a refractive index of the polymer which is introduced in a side chain of the polymer by a hydrosilyl reaction of one of the following systems:(1) a compound (A) having a carbon-carbon unsaturated bond and a group for modifying a refractive index, and a siloxane polymer (B) having a silicon hydride group wherein the molar ratio of the silicon hydride group to the carbon-carbon unsaturated bond is more than 1, and(2) a compound (A') having a silicon hydride group and a group for modifying a refractive index, and a siloxane polymer (B') having a carbon-carbon unsaturated bond wherein the molar ratio of the carbon-carbon unsaturated bond to the silicon hydride group is more than 1,the polymer being cross-linked by a hydrosilyl reaction of the unreacted silicon hydride groups of the silixane polymer (B) with a compound (C) having at least two carbon-carbon unsaturated bonds when the system (1) is used, or by a hydrosilyl reaction of the unreacted

Abstract: An optical element integrated optical waveguide comprising (1) a polymeric supporting member a length of which lies in a light transmission direction and which has at least one bore along its entire length, (2) at least one optical waveguide part consisting of organic siloxane polymer filling at least one bore, and (3) at least one optical element embedded in the optical waveguide part is provided.

Abstract: An optical sensor which comprises an optical waveguide comprising a cladding and an optical waveguide member made of a transparent elastomer which is surrounded by the cladding and through which light is propagated, wherein an amount of light to be propagated through the waveguide member is changed according to a degree of elastic deformation of the waveguide member, which is not affected by electrical and/or magnetic fields.

Abstract: An elastomeric optical fiber comprising a core made of an elastomer with rubbery elasticity and a cladding surrounding the core and having low attenuation of light transmission is produced by a method comprising flowing down a liquid polymer for the core with cross-linking it, and simultaneously with or after the formation of the core, providing the cladding around the core.

Abstract: A functional elastomer in which a viologen unit is introduced into a principal polymeric chain through cationic polymerization by using a bifunctional initiator, said elastomer being represented by the formula ##STR1## wherein X represents polyether and A represents an anion.