Abstract: A gas laser amplifier includes a housing, discharge electrode pairs, and an optical resonator. The housing includes an entrance window that allows entry of a first laser beam from outside and an exit window that allows exit of the first laser beam amplified. Each of the discharge electrode pairs excites a laser gas supplied between discharge electrodes facing each other in the housing. The optical resonator causes a second laser beam to oscillate with a gain of the excited laser gas in a non-incident state where the first laser beam from outside the housing does not enter the housing through the entrance window. In an incident state where the first laser beam enters the housing through the entrance window, the optical resonator suspends the oscillation of the second laser beam.

Abstract: A laser amplification device includes a laser oscillator that includes a first laser active medium including a mixed gas containing carbon dioxide gas and emits pulsed laser light with the full width at half maximum of between 15 ns to 200 ns, and a laser amplifier that includes a second laser active medium including a mixed gas containing carbon dioxide gas through which the pulsed laser light emitted from the laser oscillator passes to be shortened to pulsed laser light with the full width at half maximum of between 5 ns and 30 ns to be output.

Abstract: A gas laser device includes a shielding plate that is a first shielding member, and a shielding plate that is a second shielding member. The first shielding member includes a first opening, and a second opening. A laser beam that is to be propagated to discharge regions passes through the first opening. The laser beam that has taken a round trip through the discharge regions after passing through the first opening passes through the second opening. The second shielding plate faces the first shielding member the discharge regions located therebetween. The shielding plate includes an opening that is a third opening. The laser beam that has been propagated through the first opening and the discharge regions, and the laser beam that is to be propagated to the second opening through the discharge regions pass through the third opening. A plane shape of the third opening includes a rectilinear segment.

Abstract: A gas laser device includes a shielding plate that is a first shielding member, and a shielding plate that is a second shielding member. The first shielding member includes a first opening, and a second opening. A laser beam that is to be propagated to discharge regions passes through the first opening. The laser beam that has taken a round trip through the discharge regions after passing through the first opening passes through the second opening. The second shielding plate faces the first shielding member the discharge regions located therebetween. The shielding plate includes an opening that is a third opening. The laser beam that has been propagated through the first opening and the discharge regions, and the laser beam that is to be propagated to the second opening through the discharge regions pass through the third opening. A plane shape of the third opening includes a rectilinear segment.

Abstract: A laser device includes: a first mirror and a second mirror that cause resonance of a plurality of beams having different wavelengths from one another; a diffraction grating that causes the beams that are incident from the first mirror with directions of beam central axes being different from one another to travel to the second mirror while aligning the beam central axes with one another, and causes the beams that are incident from the second mirror with the beam central axes being aligned with one another to travel to the first mirror while causing the directions of the beam central axes to be different from one another; and a housing unit housing a laser medium that is a medium through which the beams traveling between the first mirror and the diffraction grating pass, and has a discrete gain spectrum in which a peak occurs at each wavelength of the beams.

Abstract: A wavelength combining laser apparatus includes: a semiconductor laser emitting laser beams in an optical-axial direction perpendicular to a laser beam combining direction; a wavelength combining element combining the laser beams in the laser beam combining direction into a single laser beam; a cross-coupling reduction optical system having positive power in the laser beam combining direction perpendicular to an optical axis of the single laser beam output from the wavelength combining element; and a partially-reflective mirror reflecting the single laser beam having passed through the cross-coupling reduction optical system and also allowing the single laser beam to transmit through and exit the partially-reflective mirror.

Abstract: A laser oscillator includes: an external resonator configured to include laser media to emit laser beams having different wavelengths; and a partially reflective mirror to transmit part of the laser beams and reflect and return a remainder toward the laser media. The external resonator includes therein: a diffraction grating to perform wavelength coupling on the laser beams having different wavelengths emitted from the laser media so as to superimpose the laser beams into one laser beam and to emit, to the partially reflective mirror, the one laser beam; and a prism that is placed between the laser media and the diffraction grating and that superimposes the laser beams into one laser beam on the diffraction grating, the prism including two surfaces forming an apex angle, one of the two surfaces being an incident surface and another of the two surfaces being an exit surface.

Abstract: A laser oscillator includes: a plurality of laser media to emit laser beams having different wavelengths; a diffraction grating to emit, in a superimposed state, the laser beams incident from the laser media; a partially reflective element to reflect part of the laser beams emitted from the diffraction grating and return the part of the laser beams to the diffraction grating, and to transmit a remainder; and a plurality of lenses each disposed between a corresponding one of the laser media and the diffraction grating. The lenses are each disposed in an optical path formed between a corresponding one of the laser media and the diffraction grating, and the lenses superimpose the laser beams from the laser media on an incident surface of the diffraction grating such that the laser beams have an equal outer diameter.

Abstract: A beam shaping device includes an SAC and an FAC. The SAC is placed between an LD bar and the FAC. A first incident surface and a first exit surface are formed in the SAC. The first incident surface includes a plurality of incident-side lens surfaces aligned in a slow axis direction X. The incident-side lens surfaces each have, in section orthogonal to a fast axis direction Y, a shape convexed toward the outside of the SAC and, in section orthogonal to the slow axis direction X, a shape concaved toward the inside of the SAC. The shape of the first incident surface and the shape of the first exit surface in section orthogonal to the slow axis direction X are concentric arcs having a point on an emission end surface of a light emitting layer as the center.

Abstract: A wavelength combining laser apparatus includes: a semiconductor laser emitting laser beams in an optical-axial direction perpendicular to a laser beam combining direction; a wavelength combining element combining the laser beams in the laser beam combining direction into a single laser beam; a cross-coupling reduction optical system having positive power in the laser beam combining direction perpendicular to an optical axis of the single laser beam output from the wavelength combining element; and a partially-reflective mirror reflecting the single laser beam having passed through the cross-coupling reduction optical system and also allowing the single laser beam to transmit through and exit the partially-reflective mirror.

Abstract: A laser device causes, with a plurality of laser media that generate laser beams having wavelengths different from one another, a convergent lens to cause laser beams each emitted from the plurality of laser media to overlap one another on a dispersive element to form a single combined beam. The dispersive element is positioned where the plurality of laser beams are caused to overlap one another by the convergent lens to form a single beam, causes a portion of the plurality of laser beams to return back toward the laser media as a first laser beam flux, and outputs another portion of the plurality of laser beams as a second laser beam flux having a single optical axis.

Abstract: A laser oscillator includes: a plurality of laser media to emit laser beams having different wavelengths; a diffraction grating to emit, in a superimposed state, the laser beams incident from the laser media; a partially reflective element to reflect part of the laser beams emitted from the diffraction grating and return the part of the laser beams to the diffraction grating, and to transmit a remainder; and a plurality of lenses each disposed between a corresponding one of the laser media and the diffraction grating. The lenses are each disposed in an optical path formed between a corresponding one of the laser media and the diffraction grating, and the lenses superimpose the laser beams from the laser media on an incident surface of the diffraction grating such that the laser beams have an equal outer diameter.

Abstract: A laser device causes, with a plurality of laser media that generate laser beams having wavelengths different from one another, a convergent lens to cause laser beams each emitted from the plurality of laser media to overlap one another on a dispersive element to form a single combined beam. The dispersive element is positioned where the plurality of laser beams are caused to overlap one another by the convergent lens to form a single beam, causes a portion of the plurality of laser beams to return back toward the laser media as a first laser beam flux, and outputs another portion of the plurality of laser beams as a second laser beam flux having a single optical axis.

Abstract: A beam shaping device includes an SAC and an FAC. The SAC is placed between an LD bar and the FAC. A first incident surface and a first exit surface are formed in the SAC. The first incident surface includes a plurality of incident-side lens surfaces aligned in a slow axis direction X. The incident-side lens surfaces each have, in section orthogonal to a fast axis direction Y, a shape convexed toward the outside of the SAC and, in section orthogonal to the slow axis direction X, a shape concaved toward the inside of the SAC. The shape of the first incident surface and the shape of the first exit surface in section orthogonal to the slow axis direction X are concentric arcs having a point on an emission end surface of a light emitting layer as the center.

Abstract: A laser oscillator includes: an external resonator configured to include laser media to emit laser beams having different wavelengths; and a partially reflective mirror to transmit part of the laser beams and reflect and return a remainder toward the laser media. The external resonator includes therein: a diffraction grating to perform wavelength coupling on the laser beams having different wavelengths emitted from the laser media so as to superimpose the laser beams into one laser beam and to emit, to the partially reflective mirror, the one laser beam; and a prism that is placed between the laser media and the diffraction grating and that superimposes the laser beams into one laser beam on the diffraction grating, the prism including two surfaces forming an apex angle, one of the two surfaces being an incident surface and another of the two surfaces being an exit surface.

Abstract: A laser module includes: a photonic crystal surface-emitting laser element; a collimating lens array for producing a parallel optical beam; a condenser lens for condensing the optical beam; and an optical fiber which receives the optical beam on one end and transmits the optical beam to the outside. In the collimating lens array, an aperture portion corresponding to a collimating lens allows passage of the optical beam with an energy of not less than 94.0% and not more than 99.5% with respect to 100% of the energy of the optical beam incident on the collimating lens array.

Abstract: A laser module includes: a photonic crystal surface-emitting laser element; a collimating lens array for producing a parallel optical beam; a condenser lens for condensing the optical beam; and an optical fiber which receives the optical beam on one end and transmits the optical beam to the outside. In the collimating lens array, an aperture portion corresponding to a collimating lens allows passage of the optical beam with an energy of not less than 94.0% and not more than 99.5% with respect to 100% of the energy of the optical beam incident on the collimating lens array.

Abstract: A semiconductor laser device includes: a semiconductor laser bar to output a plurality of beams with different wavelengths from a continuous light-emitting region; a light-condensing optical system to condense the beams; a wavelength-dispersive optical element having a wavelength dispersing function; an optical filter in which a wavelength of a beam that passes therethrough differs periodically; an aperture located on an optical path of the beams superimposed on an identical axis; and a partially reflecting mirror. A totally reflecting mirror is formed on a back side of the semiconductor laser bar, and wavelengths of a plurality of beams with different wavelengths reflected by the totally reflecting mirror and output from the semiconductor laser bar are respectively identical to wavelengths of beams that pass through the optical filter.

Abstract: A gas laser device which can perform optical amplification, laser light passing through a laser gas excited by electrical discharge, including: a first and second pair of discharge electrodes arranged longitudinally along an optical axis of the laser light; at least two mirrors reflecting the laser light amplified by the gas laser, the mirrors arranged opposite to each other to interpose a first discharge region defined by the first pair of discharge electrodes and a second discharge region defined by the second pair of discharge electrodes therebetween; and a shielding member located between the first pair of discharge electrodes and the second pair of discharge electrodes, the shielding member protruding from electrode surfaces of the discharge electrodes toward the optical axis of the laser light. The configuration can efficiently suppress parasitic oscillation with a simple structure.

Abstract: A laser processing device including: a laser oscillator; a processing table; a transmission optical system for transmitting laser light emitted from the laser oscillator to the processing table; a processing head for condensing and radiating the laser light transmitted via the transmission optical system to an object to be processed; a moving mechanism for changing a relative position between the object to be processed and the laser light to be radiated to the object to be processed; and a variable curvature spherical mirror. The transmission optical system includes a reflective beam expander mechanism for collimating and magnifying the laser light from the laser oscillator. The reflective beam expander mechanism includes a spherical mirror and a concave mirror having different curvatures in two orthogonal axes.