Abstract: Disclosed is an optical disc apparatus compatible with both ROM type and RAM type optical discs having high density and large capacity. An optical disc apparatus includes: a disc control device including an optical disc (a magneto-optical disc), a spindle motor for rotating the optical disc, an objective lens for forming a light spot on the optical disc, and a control drive device which controls and drives the objective lens in the tracking direction of the optical disc, a semiconductor laser serving as a light source, a signal light transfer having a polarization-preserving optical fiber for guiding output light from the semiconductor laser to the objective lens, ¼ wave plates provided in optical paths on both sides of the polarization-preserving optical fiber, and signal detecting devices (polarization beam splitter and photo detectors) for detecting a servo signal, etc. from the reflected light from the optical disc.

Abstract: A slider for the optical head easy to manufacture and having a high degree of freedom is to be provided as a slider for the optical head for recording and/or reproducing a recording medium using the proximity optical field. On a slider member 3, adapted for running on the recording medium in a state of being floated over or contacted with the recording medium, a catadioptric lens 7 is bonded to constitute a slider for the optical head 1. The slider member 3 and the catadioptric lens 7 are connected and optically unified to each other so that the numerical aperture NA of an optical system made up of the slider member 3 and the catadioptric lens 7 is not less than unity. Also, the plane of the focal point of the light incident for the side of the catadioptric lens 7 is designed to be on a recording medium facing surface of the slider member 3.

Abstract: The state of a polysilicon film formed by excimer laser annealing an amorphous silicon film is to be evaluated. When the amorphous silicon film is annealed to form a polysilicon film, linearity or periodicity presents itself in the spatial structure of the film surface of the polysilicon film formed depending on the energy applied to the amorphous silicon during annealing. This linearity or periodicity is processed as an image and represented numerically from the image by exploiting the linearity or periodicity. The state of the polysilicon film is checked based on the numerical results.

Abstract: A lens which has corrected the coma aberration substantially completely is provided as a catadioptric lens used with advantage in utilizing the evanescent light. The catadioptric lens is a concave non-spherical mirror having a concave refractive surface as a first surface S1 , a plane mirror as a second surface S2 and a concave non-spherical mirror arranged coaxially with the concave refractive surface of the first surface S1. The parallel incident light is converged through an aperture in the plane mirror of the second surface S2 on a total reflection plane of the fourth surface S4. The radius of curvature of the first surface S1 and the optical length d from the first surface S1 to the apex of the third surface S3 are set to satisfy the sine condition.

Abstract: Disclosed is a method for the growth of a single crystal having excellent crystallinity, uniform quality in the inside thereof and hence excellently uniform optical properties, the method enabling an improvement in yields. The invention resides in a method for the growth of a single crystal of &bgr;-type barium borate (&bgr;-BaB2O4), the method comprising heating a crucible 6 indirectly to grow a &bgr;-BaB2O4 single crystal 21 from a melt of barium borate (BaB2O4) contained in the crucible and using no flux by using a seed crystal 9 of &bgr;-BaB2O4.

Abstract: To obtain a laser beam the wavelength of 200 nm or less the repetition frequency of which is high, to reduce damage applied to mineral material such as synthetic fused silica, to extend the life of a stepper and others, to extend the life of laser parts without using toxic gas, to enhance the throughput of a stepper and others by enabling the compatibility of a high repetition frequency with the stability of a pulse, to realize an ultraviolet radiation source the whole of which is composed of a solid and to solve the problems of reliability, size, maintenance, a plumbing and others and sufficiently enhance reliability, the following procedure is taken. A second harmonic with the wavelength of 532 nm is acquired by converting the wavelength of a laser beam with the wavelength of 1.

Abstract: A laser beam generating apparatus comprising a first laser beam source oscillating in a near infrared-ray region of, for example, an Nd:YAG laser to generate a laser beam, a second higher harmonic wave generator for generating, from the laser beam emitted from the first laser beam source, a second higher harmonic wave having a half wavelength of the laser beam emitted from the first laser beam source, a splitter for splitting the second higher harmonic wave, a second laser beam source which is supplied with a part of the second higher harmonic wave thus split is input to a Ti:Sapphire laser to be excited and oscillated, thereby generating a laser beam of substantially 700 nm in wavelength, a fourth higher harmonic wave generator for generating a fourth higher harmonic wave from the remaining part of the second higher harmonic wave thus split, a sum frequency mixing composed of a BBO crystal device to which the laser beam of substantially 700 nm in wavelength and the fourth higher harmonic wave are input, and

Abstract: A UV image forming optical system includes a collimating lens for collimating light emitted from a UV light source, an imaging lens for forming an image of the collimated light transmitted through the collimating lens, and a beam splitting optical system positioned in an optical path of the collimated light between the collimating lens and the imaging lens. At least one of the collimated light emitted from the collimating lens and the light transmitted through the imaging lens, reflected by a reflector and transmitted again through the imaging lens is made incident upon an external viewing optical system.

Abstract: A wavelength conversion device in which the fundamental wave is converged in a non-linear optical crystal for effecting wavelength conversion, and in which no significant peak is generated in the non-linear optical crystal even if the power of the input fundamental wave is high. The spot radius at the converging point of the fundamental wave is selected to be 0.0014 to 0.0023 cm, while the crystal length of the non-linear optical crystal is selected to be 0.5 to 1.2 cm. If this range is met, the light intensity distribution in the non-linear optical crystal becomes of the top hat type, such that no peak is generated.

Abstract: A genetic recombination laser apparatus includes an optical system having a semiconductor laser medium for generating a semiconductor laser light, an Nd:YAG crystal, an LBO and .beta.-BBOs for reducing the wavelength of the laser light, an acoustic optical device and a lens for converging the laser light with a reduced wavelength;. A stage for positioning the focus of the laser light converged by the lens at any arbitrary location on a specimen is provided. The energy of the laser light converged on the specimen is set at a value greater than the bonding energy of the substance composing the wall of the somatic cell. Preferably, the semiconductor laser light is converted into the fifth harmonic of an Nd:YAG laser light having a wavelength of 213 nm and a second harmonic with a wavelength of 532 nm generated in the conversion process is used as for positioning the focus of the laser light converged by the lens on the specimen.

Abstract: A lens device for focusing a beam of an ultraviolet-ray region, provided with at least one aspherical lens made of synthetic quartz in which an aspherical portion is formed by a coating a fluororesin on a spherical portion of a side polished to a spherical surface; an ultraviolet-ray emitting device provided with a laser beam source emitting a beam in the ultraviolet-ray region and an object lens which has at least one of the above aspherical lenses; and an optical disc recording device provided with a laser beam source emitting a beam in the ultraviolet-ray region, a light intensity modulating means for modulating the intensity of the laser beam emitted from the laser beam source in accordance with a data signal; and the above object lens.

Abstract: The UV laser light outgoing from a UV laser light source 1 is modulated in intensity by a light modulator 2 in accordance with the subsidiary information so as to fall on a mirror 14 via lenses 3, 4, a phase diffraction lattice 5 and a half mirror 11. The UV laser light is then reflected by the mirror 14 and condensed by an objective lens 6 so as to be radiated on an optical disc 8. The UV laser light outgoing from the UV laser light source 1 falls on a phase diffraction lattice via a light modulator 2 and lenses 3 and 4 so as to be radiated on the optical disc 8 via the half mirror 11, mirror 14 and the objective lens 6. On the other hand, the reflected light of the visible laser light reflected by the optical disc 8 falls on the half mirror 11 via the objective lens 6 and the mirror 14 so as to be reflected by the half mirror 11 to fall on a photodetector 13 via a cylindrical lens 12.

Abstract: An optical pickup device for condensing the light from a light source on a signal recording surface by an objective lens and for detecting the return light from the signal recording surface by a light detection unit is disclosed. The optical pickup device is capable of recording and/or reproducing at least two different sorts of optical recording media. The light beam radiated from a light source is condensed by an objective lens. An aperture varying unit varies the size of an aperture of the objective lens depending upon the sorts of the optical recording media. The return light from the optical recording medium is detected by a light detection unit. The size of the aperture of the objective lens for condensing the light from the light source is varied depending upon the difference in substrate thickness of the different sorts of the optical recording media, thus assuring high-quality recording/reproduction for two or more different sorts of optical recording media.

Abstract: A lens evaluating device for measuring the optical transfer function of the lens under evaluation for evaluating the lens. The lens evaluating device includes an exposure light source, a converging lens for converging a light beam radiated from the exposure light source at a point, a characteristics evaluating pattern onto which the light beam outputted from the converging lens is converged by the lens under evaluation to form an image on it, a detection unit for receiving a return light beam having scanned the characteristics evaluating pattern via the lens under evaluation for detecting changes in reflection intensity of the return light beam, and an analysis unit for executing frequency analysis of the detected results from the detection unit for measuring the optical transfer function. The results of detection by the detection unit are subjected to a frequency analysis using a spectrum analyzer for measuring the optical transfer function of the lens under evaluation for evaluating the lens.

Abstract: A lens evaluating device for measuring the optical transfer function of the lens under evaluation for evaluating the lens. The lens evaluating device includes an exposure light source, a converging lens for converging a light beam radiated from the exposure light source at a point, a characteristics evaluating pattern onto which the light beam outputted from the converging lens is converged by the lens under evaluation to form an image on it, a detection unit for receiving a return light beam having scanned the characteristics evaluating pattern via the lens under evaluation for detecting changes in reflection intensity of the return light beam, and an analysis unit for executing frequency analysis of the detected results from the detection unit for measuring the optical transfer function. The results of detection by the detection unit are subjected to a frequency analysis using a spectrum analyzer for measuring the optical transfer function of the lens under evaluation for evaluating the lens.

Abstract: The present invention comprises a method and apparatus for recording digital audio information using light modulation of a laser beam on cinefilm. In the invention, a laser beam of low coherence and high output is radiated from a semiconductor laser having a wide radiating area, modulated within the depth of focus of the laser beam, and then illuminated on a sound track of a cinefilm. In one embodiment the laser beam is bifurcated into first and second beams using a diffraction lattice. The invention shortens the recording time for voice data, reduces speckle noise, and eliminates the need for polarizing plates, thereby simplifying the structure and reducing the production costs of the recording apparatus.

Abstract: An apparatus for treating solid surface using a thermally excited molecular beam according to the present invention is capable of completely preventing flying of contaminant caused by a heating source to a sample. To achieve this, in the present invention, the heating source for exciting the molecules is hermetically separated from the sample. Alternatively, a container where the heating source is housed and a container where the sample is accommodated are separated such that a conductance between the two containers is sufficiently small. In this way, chemical reactions between the molecular beam of the reactive gas which is highly reactive and the heating source heated to high temperatures can be eliminated, and flying of the contaminant to the sample can thus be greatly reduced. As a result, flying of the contaminating substances caused by the heating source to the sample can be prevented, and reduction in the surface treating rate of the sample, caused by the contaminant, can be prevented.

Abstract: An exposure device in which a reticle having a circuit pattern of a semiconductor device formed on it is irradiated with light beam emanated from a light source, such as a laser light source, for exposing the circuit pattern formed on the reticle on a semiconductor wafer. The exposure device includes a light beam generator for illuminating the reticle having a semiconductor circuit pattern formed on it, an image-forming optical system for forming an image on a wafer of a light image produced on radiating a light beam on the reticle from the light beam generator. The exposure device also includes a movement unit for moving the wafer relative to the image-forming optical system, and an alignment unit for detecting the position on the wafer of the image formed on the wafer by the image-forming optical system for position matching the image by the image-forming optical system relative to the wafer. The light beam generator includes a light source for excitation, a first resonator and a second resonator.

Abstract: A system for correcting for positional deviations in a hand-held video camera caused by small movements or shaping of the user's hands includes an afocal optical system constituted by a positive meniscus lens and a negative meniscus lens. The positional deviations of the camera caused by minute tremors or shaking of the user's hands are detected by a pitch sensor and a roll sensor and a micro-computer is responsive to the detected amount of the positional deviations to drive the positive meniscus lens and the negative meniscus lens in vertical and horizontal directions with respect to the optical axis, thereby controlling the position of the image pickup light being radiated onto a CCD image sensor of the video camera.

Abstract: A method of growing a single crystal of KTiOPO.sub.4 which is a nonlinear optical material is disclosed. Growth of the single crystal of KTiOPO.sub.4 is carried out by melting a KTiOPO.sub.4 material with a flux to produce a melt, then contacting a seed crystal to the melt, and by slowly cooling at a saturation temperature or below. At this time, molar fractions of K.sub.2 O, P.sub.2 O.sub.5 and TiO.sub.2 contained in the melt fall within a region surrounded by six point in a K.sub.2 O-P.sub.2 O.sub.5 -TiO.sub.2 ternary phase diagram of A (K.sub.2 O:0.4150, P.sub.2 O.sub.5 :0.3906, TiO.sub.2 : 0.1944), B (K.sub.2 O:0.3750, P.sub.2 O.sub.5 : 0.3565, TiO.sub.2 : 0.2685), C (K.sub.2 O: 0.3750, P.sub.2 O.sub.5 : 0.3438, TiO.sub.2 : 0.2813), D (K.sub.2 O: 0.3850, P.sub.2 O.sub.5 : 0.3260, TiO.sub.2 : 0.2890), E (K.sub.2 O: 0.4000, P.sub.2 O.sub.5 : 0.3344, TiO.sub.2 : 0.2656), and F (K.sub.2 O: 0.4158, P.sub.2 O.sub.5 : 0.3744, TiO.sub.2 : 0.2098). In addition, K.sub.15 P.sub.13 O.sub.