Abstract: A non-contact type tonometer includes a air injector for blowing air to a cornea of a subject's eye along a reference axis to deform the cornea, a projection optical system for projecting projection light onto the subject's eye, a light-receiving optical system for receiving reflected light which is projected from the projection optical system and reflected on the subject's eye, an alignment unit for positioning the projection optical system and the light-receiving optical system in the direction of the reference axis based on a light amount of the reflected light which is received by the light-receiving optical system and an intraocular pressure detector for detecting a deformation of the cornea based on the reflected light amount. The projection optical system includes a light flux shape regulator which regulates the projection light such that the projection light has a non-circular shape extending in a predetermined direction.

Abstract: An air pulse discharging device for a noncontact type tonometer, which includes: a cylinder; a piston arranged reciprocatably in the cylinder and which compresses air in a compression space; a nozzle which discharges the compressed air to an examined eye; at least one opening provided on the piston and which communicates the compression space with a cylinder atmospheric-air releasing chamber; and a valve disk provided to the piston and which opens and closes the at least one opening, the valve disk closes the at least one opening based on a differential pressure between the compression space and the cylinder atmospheric-air releasing chamber when the piston is driven to a direction of compressing the air in the compression space, and opens the at least one opening based on the differential pressure when the piston is driven to a direction opposite to the direction of compressing the air in the compression space.

Abstract: A laser device, comprising a laser beam emitter having an optical resonator, wherein the optical resonator has a resonator and a reflection mirror, and at least one of a length of the resonator or a curvature of the reflection mirror is determined so as to satisfy condition that a parameter M2 of beam quality of a projected laser beam is within a range of 8?M2?22, where M2=?W·?/? (W is a beam waist of a laser beam; ? is a spreading angle; and ? is a wavelength of the laser beam).

Abstract: A laser device for medical treatment system, comprising at least a plurality of laser beam emitting sources, a laser beam multiplexing means for superimposing the laser beams emitted from the laser beam emitting sources, and a beam mixing means where the laser beams from the laser beam multiplexing means enter.

Abstract: An ophthalmologic photocoagulator and photoagulation method thereof in which visibility of sighting laser beam which is projected onto the eye fundus of an eye to be examined is improved and a loss in the amount of treatment laser beam can be reduced. The ophthalmologic photocoagulator includes: a treatment laser oscillator that oscillates a treatment laser beam for conducting treatment on a diseased part of the eye to be examined by photocoagulation; a sighting laser oscillator that oscillates a sighting laser beam for conducting sighting on the diseased part of the eye to be examined which is to be irradiated with the treatment laser beam; and a polarization beam splitter for combining an optical path of the treatment laser beam with an optical path of the sighting laser beam by polarization coupling. The treatment laser beam oscillating from the treatment laser oscillator and the sighting laser beam oscillating from the sighting laser oscillator have similar colors.

Abstract: There is provided a laser operation apparatus capable of emitting suitable laser light having a uniformed light intensity distribution. A fiber vibrating device is fit to a portion of an optical fiber that guides laser light oscillated (for treatment) by a treatment laser light source to a slit lamp. The fiber vibrating device itself is vibrated by rotating a weight provided eccentric about a rotational shaft by a motor, thereby vibrating the optical fiber in a direction substantially orthogonal to an axial line direction thereof. When the optical fiber is vibrated by the fiber vibrating device, the laser light guided through the optical fiber is mixed to uniform the light intensity distribution of the laser light. The laser light having the uniformed light intensity distribution is emitted to an eye to be operated by the slit lamp.

Abstract: A laser device for medical treatment system, comprising at least a plurality of laser beam emitting sources, a laser beam multiplexing means for superimposing the laser beams emitted from the laser beam emitting sources, and a beam mixing means where the laser beams from the laser beam multiplexing means enter.

Abstract: A laser device, comprising a laser beam emitter having an optical resonator, wherein the optical resonator has a resonator and a reflection mirror, and at least one of a length of the resonator or a curvature of the reflection mirror is determined so as to satisfy condition that a parameter M2 of beam quality of a projected laser beam is within a range of 8≦M2≦22, where M2=&pgr;W·&THgr;/&lgr; (W is a beam waist of a laser beam; &THgr; is a spreading angle; and &lgr; is a wavelength of the laser beam).

Abstract: There is provided an ophthalmologic photocoagulator and photoagulation method thereof in which visibility of sighting laser beam which is projected onto the eye fundus of an eye to be examined is improved and a loss in the amount of treatment laser beam can be reduced. The ophthalmologic photocoagulator includes: a treatment laser oscillator that oscillates treatment laser beam for conducting treatment on a diseased part of the eye to be examined by photocoagulation; a sighting laser oscillator that oscillates sighting laser beam for conducting sighting on the diseased part of the eye to be examined which is to be irradiated with the treatment laser beam; and a polarization beam splitter for combining an optical path of the treatment laser beam with an optical path of the sighting laser beam by polarization coupling. The treatment laser beam oscillating from the treatment laser oscillator and the sighting laser beam oscillating from the sighting laser oscillator have similar colors.

Abstract: A laser operating system, comprising treatment laser beam projector for projecting a treatment laser beam to an affected site to be treated, sighting laser beam projector for projecting a sighting laser beam for aligning the treatment laser beam to the affected site, and an adjuster 36 for adjusting a spot diameter of the treatment laser beam, wherein output of the sighting laser beam projector is adjusted in association with adjusting operation of the adjuster.

Abstract: A laser oscillation apparatus, comprising a laser beam emitting unit for emitting an excitation light, an optical resonance unit at least having a laser crystal and an output mirror, a nonlinear optical medium which is placed in the optical resonance unit and which generates a second harmonic from a fundamental wave oscillated by the laser crystal, and a driving means for driving the laser beam emitting unit, wherein the nonlinear optical medium is held by a nonlinear optical medium holder, and the nonlinear optical medium holder can be rotated with respect to axes of at least two directions crossing to an optical axis passing through the optical resonance unit.

Abstract: A laser oscillation apparatus, comprising a laser beam emitting unit for emitting an excitation light, an optical resonance unit at least having a laser crystal and an output mirror, a plurality of optical fibers for guiding the laser beam from the laser beam emitting unit to the optical resonance unit, and a driving means for driving the laser beam emitting unit, wherein the laser beam emitting unit has a plurality of light emitting sources on a straight line, the plurality of optical fibers are arranged and held in such manner that end surfaces of the optical fibers face the plurality of light emitting sources respectively and the plurality of optical fibers makes up a fiber array unit, wherein the fiber array unit is adjustably held between a pair of wedge-shaped holders each having a cross-section in triangular form.

Abstract: A laser oscillation apparatus, comprising a laser beam emitting unit for emitting an excitation light, an optical resonance unit at least having a laser crystal and an output mirror, a nonlinear optical medium which is placed in the optical resonance unit and which generates a second harmonic from a fundamental wave oscillated by the laser crystal, and a driving means for driving the laser beam emitting unit, wherein the nonlinear optical medium is held by a nonlinear optical medium holder, and the nonlinear optical medium holder can be rotated with respect to axes of at least two directions crossing to an optical axis passing through the optical resonance unit.

Abstract: A laser oscillation apparatus, comprising a laser beam emitting unit for emitting an excitation light, an optical resonance unit at least having a laser crystal and an output mirror, a plurality of optical fibers for guiding the laser beam from the laser beam emitting unit to the optical resonance unit, and a driving means for driving the laser beam emitting unit, wherein the laser beam emitting unit has a plurality of light emitting sources on a straight line, the plurality of optical fibers are arranged and held in such manner that end surfaces of the optical fibers face the plurality of light emitting sources respectively and the plurality of optical fibers makes up a fiber array unit, wherein the fiber array unit is adjustably held between a pair of wedge-shaped holders each having a cross-section in triangular form.

Abstract: A laser apparatus which is capable of terminating a irradiating operation using a laser beam without fail by opening switches even if a component of an irradiation switch unit have trouble during the irradiating operation in a continuous irradiation mode. A first switch (11) and a second switch (12) are connected electrically in series by signal lines (18) and are disposed in a side-by-side arrangement. An operating member (13) is a pedal for a foot switch or the like and is capable of substantially simultaneously closing and opening the first switch (11) and the second switch (12) in substantially the same degree. The irradiation switch unit may further be provided with a cover (16) for covering the operating member (13).