WO2015008405A1 - ガスレーザ装置 - Google Patents
ガスレーザ装置 Download PDFInfo
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- WO2015008405A1 WO2015008405A1 PCT/JP2013/085063 JP2013085063W WO2015008405A1 WO 2015008405 A1 WO2015008405 A1 WO 2015008405A1 JP 2013085063 W JP2013085063 W JP 2013085063W WO 2015008405 A1 WO2015008405 A1 WO 2015008405A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/038—Electrodes, e.g. special shape, configuration or composition
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/034—Optical devices within, or forming part of, the tube, e.g. windows, mirrors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08018—Mode suppression
- H01S3/0804—Transverse or lateral modes
- H01S3/0805—Transverse or lateral modes by apertures, e.g. pin-holes or knife-edges
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/02—ASE (amplified spontaneous emission), noise; Reduction thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/07—Construction or shape of active medium consisting of a plurality of parts, e.g. segments
- H01S3/073—Gas lasers comprising separate discharge sections in one cavity, e.g. hybrid lasers
- H01S3/076—Folded-path lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/097—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser
- H01S3/0971—Processes or apparatus for excitation, e.g. pumping by gas discharge of a gas laser transversely excited
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/22—Gases
- H01S3/223—Gases the active gas being polyatomic, i.e. containing two or more atoms
- H01S3/2232—Carbon dioxide (CO2) or monoxide [CO]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2308—Amplifier arrangements, e.g. MOPA
- H01S3/2325—Multi-pass amplifiers, e.g. regenerative amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2366—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media comprising a gas as the active medium
Definitions
- the present invention relates to a gas laser device for amplifying laser light using a laser gas.
- SA saturable absorber
- JP 2010-103104 A (FIGS. 1 and 2) JP 2010-186990 A ([0051], FIG. 11) JP 2011-159932 A International Publication No. 2012/176253 International Publication No. 2013/084608
- An object of the present invention is to provide a gas laser device that can efficiently suppress parasitic oscillation with a simple configuration.
- the present invention is a gas laser device that performs optical amplification by passing laser light through discharge-excited laser gas, A first discharge electrode pair and a second discharge electrode pair arranged in a column along the optical axis of the laser beam; At least two reflecting the laser light amplified by the laser gas, arranged opposite to each other so as to sandwich the first discharge region defined by the first discharge electrode pair and the second discharge region defined by the second discharge electrode pair Mirror, A shielding member is provided between the first discharge electrode pair and the second discharge electrode pair and protrudes from the electrode surface of the discharge electrode toward the optical axis of the laser beam.
- the protruding height of the shielding member is preferably set to a height that does not interfere with the laser beam.
- the gas laser device further includes an electrode support structure for supporting the first and second discharge electrode pairs,
- the shielding member is preferably formed integrally with the electrode support structure.
- the protruding shape of the shielding member preferably has a shape selected from the group consisting of a sawtooth wave, a triangular wave and a sine wave.
- a plurality of the shielding members are arranged so as to sandwich the optical axis of the laser beam.
- the shielding member is formed of aluminum whose surface is anodized.
- the surface of the shielding member preferably has a surface roughness rougher than the wavelength of the laser beam.
- an aperture having an aperture through which laser light is transmitted is provided in front of the mirror.
- the laser gas is supplied in a direction perpendicular to both the optical axis of the laser beam and the discharge direction,
- the laser gas supply direction to the first discharge electrode pair is preferably opposite to the laser gas supply direction to the second discharge electrode pair.
- the shielding member has an inclined surface that faces the first and second discharge regions and is inclined with respect to the optical axis of the laser beam.
- the width in the optical axis direction of the surface facing the protruding height direction is a
- the wavelength of the laser light is ⁇
- the diameter of the opening is ⁇
- the discharge gap between the discharge electrodes is D
- the light beam of the laser beam is provided by installing a shielding member protruding from the electrode surface of the discharge electrode toward the optical axis of the laser beam between the first discharge electrode pair and the second discharge electrode pair.
- Parasitic oscillation that proceeds off the axis can be efficiently suppressed with a simple configuration.
- FIG. 1 is a perspective view showing a gas laser device according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view showing the electrode support structure.
- FIG. 3 is a partial perspective view showing a structure in which the electrode support structure and the shielding plate are integrated.
- the gas laser device constitutes a so-called three-axis orthogonal gas laser device, and includes electrode substrates 1, 2, 3, and 4, electrodes 11, 12, 13, and 14, mirror support portions 31 and 32, and windows 41 and 42. And mirrors 43, 44, 45, 46, a shielding plate 51, and the like.
- the direction substantially parallel to the optical axis of the laser beam is defined as the X direction
- the direction parallel to the laser gas supply direction is defined as the Y direction
- the direction parallel to the discharge direction is defined as the Z direction.
- the electrode substrates 1, 2, 3, and 4 are made of a dielectric material such as alumina, and metal electrodes 11, 12, 13, and 14 are bonded to the surface thereof by metallization, paste, or the like. By adopting a structure in which the electrode is supported by the electrode substrate, the mechanical strength of the entire discharge mechanism can be improved.
- the pair of electrode substrates 1 and 2 are supported by electrode support structures 61 and 62, and are disposed so as to face each other.
- a pair of electrodes 11 and 12 are respectively disposed near the Y direction from the center.
- silent discharge ozonizer discharge
- the laser gas G is supplied to the discharge region 21 in the ⁇ Y direction.
- the pair of electrode substrates 3 and 4 are supported by the electrode support structures 61 and 62 and are installed so as to face each other.
- a pair of electrodes 13, 14 are respectively arranged near the ⁇ Y direction from the center.
- silent discharge ozonizer discharge
- a discharge region 22 is formed.
- the laser gas G is supplied to the discharge region 22 in the Y direction.
- the pair of electrode substrates 1 and 2 and the pair of electrode substrates 3 and 4 are arranged in tandem along the optical axis of the laser beam.
- the discharge electrodes 11, 12, 13, and 14 have, for example, a metal portion having a surface of about 5 cm ⁇ 100 cm, and the discharge regions 21 and 22 have a rectangular parallelepiped shape of about 5 cm ⁇ 5 cm ⁇ 100 cm, for example.
- CO 2 is used as the laser gas G
- another laser medium such as CO, N 2 , He—Cd, HF, Ar + , ArF, KrF, XeCl, XeF or the like is used.
- the present invention is also applicable.
- the gas laser device includes a housing (not shown) for blocking the laser gas G from the outside air, and a heat exchanger, a blower, a duct, and the like are provided inside the housing.
- the blower circulates the laser gas G sealed in the casing along the wind tunnel in the duct.
- the laser gas G is supplied toward the discharge regions 21 and 22 along the direction of the arrows.
- the laser gas G that has passed through the discharge regions 21 and 22 is cooled by the heat exchanger and returns to the blower again.
- the laser gas G is maintained at a pressure lower than the atmospheric pressure, and the laser gas G moves in the direction of the arrow in FIG. 1 at a spatially uniform velocity distribution, for example, a velocity of about 100 m / s. .
- the windows 41 and 42 and the mirrors 43, 44, 45, and 46 are arranged so as to face each other with the discharge regions 21 and 22 interposed therebetween.
- a window 41 and mirrors 43 and 44 are attached to the housing via the mirror support 31.
- the window 42 and the mirrors 45 and 46 are attached to the housing via the mirror support portion 32.
- As the windows 41 and 42 for example, a diamond substrate provided with an antireflection coating is used.
- the windows 41 and 42 have a function of allowing laser light to pass between the inside and outside of the gas laser apparatus and blocking the laser gas G from the outside air.
- the mirrors 43, 44, 45, 46 for example, concave, flat or convex total reflection mirrors are used to constitute an optical amplification path.
- FIG. 4 is an explanatory diagram showing a path of laser light in the gas laser apparatus.
- the gas laser device has a function of amplifying pulsed laser light.
- the laser light L enters from the window 41 along the optical axis L 0, is sequentially reflected by the mirror 45, the mirror 44, the mirror 46, and the mirror 43 and is emitted from the window 42.
- the mirror 44 is not parallel to both the mirrors 45 and 46, and the mirror 43 is also not parallel to both the mirrors 45 and 46.
- Such non-parallel arrangement can suppress parasitic oscillation between the mirrors facing each other (see Patent Document 3).
- FIG. 5 is an explanatory diagram showing the relationship between the laser beam L and the optical axis L0.
- the laser light L propagates with a spread of the beam radius w with respect to the optical axis L0.
- the beam radius w is defined as a radius of a circle including 86% of energy propagating as laser light.
- the optical axis L0 is illustrated over the entire path, but in order to avoid the complexity of the drawing, only a part of the path is illustrated for the laser light L, and between the mirrors 45 and 44, between 44 and 46, The section between 46 and 43 is omitted.
- the shielding plate 51 is disposed between the pair of electrode substrates 1 and 2 and the pair of electrode substrates 3 and 4 and protrudes from the electrode surface of the discharge electrode toward the optical axis of the laser beam.
- the shielding plate 51 is preferably formed of an aluminum material whose surface is anodized. Further, the surface of the shielding plate 51 preferably has a surface roughness rougher than the wavelength of the CO 2 laser (that is, arithmetic average roughness Ra> 10.6 ⁇ m).
- the surface roughness of the shielding plate 51 may be 20 to 40 ⁇ m, for example, and can be manufactured by, for example, sand blasting, knurling, other cutting, rolling, chemical treatment, or the like.
- the shielding plate 51 has a macroscopic three-dimensional shape different from the above surface roughness, and may be, for example, a periodic wave shape composed of three peaks with a pitch between the peaks of 4 cm. The peak of such a mountain is higher than the electrode surfaces of the electrodes 11 and 13.
- the shielding plate 51 can be formed integrally with the electrode support structures 61 and 62.
- the electrode support structures 61 and 62 are also preferably formed of an aluminum material whose surface is anodized. Such an integrated structure can reduce the number of parts and the manufacturing cost.
- the height of the shielding plate 51 is set to a height that does not interfere with the laser light L.
- the optical axis height of the laser beam measured from the electrode substrates 1 and 3 at the position of the shield plate 51 and H L0, using a beam radius, the height H 51 of the shield plate 51 is, for example, the following It is set as equation (1).
- H 51 H L0 -1.5w (1)
- the shielding plate 51 is provided between the laser gases excited by the two sets of discharge electrodes so as to be convex with respect to the electrode surface, thereby suppressing high parasitic oscillation described below with an inexpensive configuration. There is an effect.
- Parasitic oscillation hinders amplification of the target pulse laser and lowers the amplification efficiency, and also causes laser light to oscillate in an unintended direction, causing failure inside and outside the gas laser device.
- parasitic oscillation is suppressed by disposing a saturable absorber between two discharge tubes.
- the saturable absorber is a system that circulates and cools a mixed gas that absorbs laser light to a cell through which the laser light passes, and is compared with a member such as a shielding plate according to the present embodiment. Extremely complex and expensive.
- the amplification efficiency is lowered when the pulse laser beam passes through the saturable absorber.
- a gas laser device that suppresses parasitic oscillation without using a saturable absorber is configured.
- a technique for suppressing parasitic oscillation between opposing mirrors by arranging the opposing mirrors (mirrors 44 and 46, 43 and 45, etc.) so as not to face each other in parallel.
- electrode reflection type parasitic oscillation as shown in FIG. 6 occurs. Since reflection at the discharge electrode is included in the path of parasitic oscillation, this is referred to as electrode reflection type parasitic oscillation.
- Such electrode reflection type parasitic oscillation is not limited to the mirrors 43 to 46, but can also occur in a path including the reflection of the structural members supporting the mirrors 43 to 46 and the windows 41 and 42. Further, it has been found that the discharge electrode is generated even when there are two sets of 11, 12, and 13, 14 and a gap is provided between the two sets of electrodes.
- a mechanism such as a holder for attaching the window 41 and the mirrors 43 and 44 to the mirror support 31 is complicated. Further, the gain per one way of the amplifier increases in proportion to the number of turns. Therefore, as the number of turns increases, the possibility of causing parasitic oscillation in an unintended path increases. As shown in FIG. 7, the mechanism for attaching the mirror support portions 31 and 32, the mirror, or the window may cause parasitic oscillation by reflecting light to some extent.
- the shield plate 51 is provided between the discharge region 21 and the discharge region 22 so as to be convex with respect to the electrode surface, thereby suppressing electrode reflection type parasitic oscillation. be able to.
- the shielding plate 51 does not necessarily absorb the laser beam and may scatter the laser beam. However, the effect of suppressing the parasitic oscillation can be surely obtained by absorbing the laser beam. In the present invention, what absorbs or scatters laser light is called a shielding plate.
- the shielding plate 51 is provided between the laser gases excited by the two sets of discharge electrodes (two sets of 11, 12 and 13, 14) so as to be convex with respect to the electrode surface. It has the effect of suppressing parasitic oscillation with an inexpensive configuration. In particular, a high parasitic oscillation suppression effect is achieved by suppressing the electrode reflection type parasitic oscillation described above.
- the shielding plate 51 is too high and interferes with the laser beam L to be amplified, the amplification output is lowered and the beam quality of the amplified laser beam is deteriorated. A higher parasitic oscillation suppression effect is obtained as the height is increased within a range not interfering with the laser beam L to be amplified.
- the multiple folded laser light passes through a region lower than the height of the shielding plate 51 (close to the electrodes 11 and 13). By doing so, it is possible to effectively use the discharge excitation energy stored in the discharge region, and to obtain the maximum laser beam amplification output.
- the shielding plate 51 By forming the shielding plate 51 from an alumite-treated aluminum material, the effect of suppressing parasitic oscillation can be obtained with an inexpensive and easily available material. Further, since the aluminum material subjected to the alumite surface treatment is not easily affected by the laser gas, it has an effect of extending the life of the gas laser device.
- the material of the shielding plate 51 is not limited to an aluminum material, but may be other metals or metal oxides.
- the surface of the shielding plate 51 is subjected to surface treatment that is rougher than the wavelength of the laser to be amplified, so that the effect of suppressing electrode reflection type parasitic oscillation can be enhanced.
- the shielding plate 51 By integrating the electrode support structure 61 and the shielding plate 51, when the shielding plate generates heat by absorbing the outer edge portion of the pulse laser to be amplified, the heat radiation from the shielding plate 51 is improved.
- An inexpensive gas laser device that can be easily assembled can be provided.
- the surface of the shielding plate 51 has an angle close to perpendicular to the direction of the optical axis, parasitic oscillation is likely to occur. Therefore, the surface of the shielding plate 51 is not clearly perpendicular to the direction of the optical axis (for example, 20 degrees). It is preferable.
- the angle at which the laser beam from the mirrors 41, 43, 44 or the mirror support part 31 to the shield plate 51 is regularly reflected by the shield plate 51 is not incident on the mirrors 41, 43, 44 or the mirror support part 31 again. In this case, the parasitic oscillation is suppressed.
- the shielding plate 51 corrugated (in this embodiment, a corrugated structure having three peaks), the maximum parasitic oscillation suppression effect is obtained while keeping the volume of the shielding plate 51 small.
- the shielding plate is not limited to the three mountain configuration, and may be one mountain, two mountains, or more than three mountains. The corners of the mountain may be round or standing.
- FIG. 8 is an explanatory view showing various examples of the corrugated shape of the shielding plate 51.
- 8A shows the shape of a sawtooth wave as shown in FIG. 1
- FIG. 8B shows the shape of a triangular wave
- FIG. 8C shows the shape of a sine wave.
- the corrugated shape of the shielding plate 51 may be selected from these shapes, or may be a single mountain configuration, a two mountain configuration, or a three or more mountain configuration.
- the laser gas G is supplied in a direction perpendicular to both the optical axis of the laser beam and the discharge direction, and the supply direction of the laser gas to the discharge region 21 is opposite to the supply direction of the laser gas to the discharge region 22.
- the laser gas flow is not obstructed by the shielding plate, and a necessary laser gas flow rate is obtained while minimizing energy loss.
- Due to the configuration in which the laser gas flow is perpendicular to the optical axis of the laser light a temperature distribution of the laser gas is generated in the laser gas flow direction, and the path of the laser light is bent. Similarly, the path of a parasitic laser beam is also bent.
- the direction of the laser gas supplied to the discharge region 21 is reversed from the direction of the laser gas supplied to the discharge region 22, thereby canceling the bending of the path of the laser beam that oscillates in a parasitic manner.
- the effect which suppresses also is acquired.
- FIG. 15 is a partial perspective view showing another example of the shielding plate 51.
- the shielding plate 51 has a shape protruding from the electrode surface of the discharge electrode toward the optical axis of the laser beam, and the upper surface facing the optical axis is a flat surface without being corrugated or chevron, It faces the discharge regions 21 and 22 and has an inclined surface inclined with respect to the optical axis of the laser beam.
- the laser beam from the mirror support portion 31 having the window 41 and the mirrors 43 and 44 to the shield plate 51 is regularly reflected by the shield plate 51, and again returns to the mirror support portion 31 having the window 41 and the mirrors 43 and 44.
- the angle can be set so that it does not enter. Therefore, this configuration also has the effect of suppressing parasitic oscillation.
- FIG. FIG. 9 is a perspective view showing a gas laser device according to Embodiment 2 of the present invention.
- This gas laser apparatus has the same configuration as that of the first embodiment, but differs in that apertures 71, 72, 73, 74, 75, and 76 are provided.
- Apertures 71 and 72 are provided inside the windows 41 and 42, respectively.
- the apertures 73, 74, 75, and 76 are provided inside the mirrors 43, 44, 45, and 46, respectively.
- the apertures 71 to 76 are copper members having a circular opening, and the inside of the opening transmits laser light and the outside of the opening does not transmit laser light. These 71 to 76 are respectively fixed to the mirror support portions 31 and 32 or the housing of the apparatus.
- FIG. 10 is an explanatory diagram showing a method of determining the height of the shielding plate.
- FIG. 10 is an explanatory diagram showing a method of determining the height of the shielding plate.
- two apertures 71 and 75 of the six apertures are shown, but the same method can be applied to the other apertures 72 to 74 and 76.
- an imaginary straight line V connecting the lower ends of the apertures 71 and 75 is shown as an auxiliary, and this straight line V is a guideline for the lower limit of the laser light traveling from the aperture 71 to the aperture 75.
- the range in which the laser beam exists can be defined by the aperture, and the height of the shielding plate can be determined within a range that does not interfere with the amplified laser beam L.
- FIG. 11 is a configuration diagram showing the third embodiment of the present invention, and shows various settings of the optical axis of the laser beam.
- FIG. 11A shows an optical path in the first embodiment, which is the same as that shown in FIG.
- the pulse laser beam (optical axis L0) enters from the window 41 shown in FIG. 1, is sequentially reflected by the mirror 45, the mirror 44, the mirror 46, and the mirror 43, and is emitted from the window 42 shown in FIG.
- the pulsed laser light travels in the order of window 41, mirror 46, mirror 43, mirror 45, mirror 44, and window 42.
- An additional shielding plate 52 is installed on the side opposite to the shielding plate 51.
- the pulsed laser light travels in the order of window 41, mirror 45, mirror 43, mirror 46, mirror 44, and window 42.
- the pulsed laser light travels in the order of window 41, mirror 46, mirror 43, mirror 45, mirror 44, and window 42.
- the window 42 is installed near the electrode substrate 3.
- the pulsed laser light travels in the order of window 41, mirror 46, mirror 44, mirror 45, mirror 43, and window 42.
- the window 42 is installed near the electrode substrate 3.
- An additional shielding plate 52 is installed on the side opposite to the shielding plate 51.
- the pulsed laser light travels in the order of window 41, mirror 46, mirror 44, mirror 45, mirror 43, and window 42.
- the window 42 is installed between the mirror 45 and the mirror 46.
- the pulsed laser light travels in the order of window 41, mirror 46, mirror 43, mirror 45, mirror 44, and window 42.
- the window 42 is installed between the mirror 45 and the mirror 46.
- An additional shielding plate 52 is installed on the side opposite to the shielding plate 51.
- the pulsed laser light travels in the order of window 41, mirror 45, mirror 44, mirror 46, mirror 43, and window 42.
- the window 41 is installed between the mirror 43 and the mirror 44.
- the window 42 is installed between the mirror 45 and the mirror 46.
- the height of the shielding plate 52 can be determined using the above formula (1) or formula (2).
- the shielding plate 52 can be formed integrally with the electrode support structures 61 and 62 similarly to the shielding plate 51.
- FIGS. 11A to 11H are turned upside down. Further, the same effect can be obtained even if the arrangement of the window 41 and the mirrors 43 and 44 is reversed left and right. The same effect can be obtained even if the arrangement of the window 42 and the mirrors 45 and 46 is reversed left and right.
- FIG. FIG. 12 is a partial perspective view showing Embodiment 4 of the present invention.
- This gas laser device has the same configuration as that of the first embodiment, but a more specific structure for the shielding plate is presented.
- the shielding plates 51a and 51b are formed integrally with the electrode support structures 61a and 61b, respectively.
- the shielding plates 51a and 51b face the discharge areas 21 and 22 and have an inclined surface inclined with respect to the optical axis of the laser beam.
- the shielding plates 51a and 51b have a single triangular triangular wave.
- the convexity of one triangular wave is directed toward the discharge region 21, and with respect to the shielding plate 51b, the convexity of one triangular wave is directed toward the discharge region 22. Since the shielding plates 51a and 51b are thus convex when viewed from the discharge regions 21 and 22, the light rays generated in the discharge regions 21 and 22 and hit the shielding plates 51a and 51b are directed toward the outside of the discharge region. As a result, the risk of parasitic oscillation can be minimized.
- the shape of the shielding plate according to the present embodiment can be used in combination with the first to third embodiments described above.
- FIG. 13 is an explanatory diagram showing the relationship between the width in the optical axis direction of the surface of the shielding plate 51 facing the protruding height direction (referred to herein as the upper surface) and the laser beam path.
- the width of the upper surface in the optical axis direction is a
- the wavelength of the laser light is ⁇
- the diameter of the opening is ⁇
- the discharge gap between the discharge electrodes is D
- the distance from the shielding plate to the opening is z.
- the distance z is sufficiently larger than the gap D.
- z is 1 m and D is 5 cm.
- FIG. 13 is an explanatory diagram showing the relationship between the width in the optical axis direction of the surface of the shielding plate 51 facing the protruding height direction (referred to herein as the upper surface) and the laser beam path.
- the width of the upper surface in the optical axis direction is a
- the wavelength of the laser light is
- the beam L toward the mirror 46 is expressed as an example.
- the narrowest position of the laser beam is smaller, and the spread angle of the beam diameter is larger. Therefore, the smaller the width a is, the larger the beam diameter at the mirror 46 of the beam reflected from the upper surface is. If the width a is sufficiently small, the beam diameter becomes larger than the aperture diameter in the aperture 76 provided immediately before the mirror 46, and the beam is also scattered by the aperture, and the electrode reflection including the upper surface of the shielding plate, the mirror, and the electrode in the path. The risk of mold parasitic oscillation is significantly reduced.
- the radius w 0 of the beam towards the direct mirror reflected from the shielding plate upper surface is given by Equation (4).
- the incident angle is set to the maximum D / z.
- the beam spread is the smallest when propagating a sufficiently long distance z compared to a.
- the beam radius at the aperture position is given by equations (5) and (6).
- Equation (5) When z is sufficiently larger than a, Equation (5) can be approximated to Equation (7).
- Equation (7) The beam radius at the aperture position can be obtained from Equation (7) and Equation (6). If the beam radius at the aperture position is larger than the aperture radius, the risk of parasitic oscillation is significantly reduced. Expression (8) represents this condition.
- FIG. 14 is an explanatory view showing an example of the cross-sectional shape of the shielding plate.
- chamfering (corner) processing is performed to cut the corner portion of the shielding plate 51 into a flat surface or a round surface. By performing such processing, it is possible to secure the cross-sectional area of the shielding plate 51 to be strong against heat, and to reduce the risk of parasitic oscillation.
- a shape in which a is made as close to zero as possible by sharpening the upper surface is more desirable.
- the optical path in the housing is configured to be folded in five has been described, but the same parasitic oscillation suppressing effect can be obtained even in a multiple folded configuration in which the optical path is folded in six or more.
- the present invention is extremely useful industrially in that parasitic oscillation can be efficiently suppressed with a simple configuration.
- Electrode substrates 11 to 14 electrodes, 21 and 22 discharge regions, 31, 32 mirror support, 41, 42 window, 43 to 46 mirror, 51, 51a, 51b, 52 shielding plate, 61, 62, 61a, 61b electrode support structure, 71-76 aperture, G laser gas, L laser light, L0 optical axis, V virtual straight line, w Beam radius.
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Abstract
Description
レーザ光の光軸に沿って縦列配置された第1放電電極対および第2放電電極対と、
前記第1放電電極対によって規定される第1放電領域および前記第2放電電極対によって規定される第2放電領域を挟むように対向配置され、レーザガスによって増幅されたレーザ光を反射する少なくとも2つのミラーと、
前記第1放電電極対と前記第2放電電極対との間に設置され、放電電極の電極面からレーザ光の光軸に向けて突出した遮蔽部材とを備えることを特徴とする。
前記遮蔽部材は、該電極支持構造と一体的に形成されていることが好ましい。
前記第1放電電極対へのレーザガスの供給方向は、前記第2放電電極対へのレーザガスの供給方向とは反対であることが好ましい。
図1は、本発明の実施の形態1によるガスレーザ装置を示す斜視図である。図2は、電極支持構造を示す断面図である。図3は、電極支持構造と遮蔽板とを一体化した構造を示す部分斜視図である。
図9は、本発明の実施の形態2によるガスレーザ装置を示す斜視図である。このガスレーザ装置は、実施の形態1のものと同様な構成を有するが、アパーチャ71,72,73,74,75,76を設置している点で相違する。
図11は、本発明の実施の形態3を示す構成図であり、レーザ光の光軸の各種設定を示している。図11Aは、実施の形態1における光路を示すもので、図4に示したものと同等である。パルスレーザ光(光軸L0)は、図1に示したウインドウ41から入射して、ミラー45、ミラー44、ミラー46、ミラー43で順次反射され、図1に示したウインドウ42から出射される。
図12は、本発明の実施の形態4を示す部分斜視図である。このガスレーザ装置は実施の形態1のものと同様な構成を有するが、遮蔽板についてさらに具体的な構造を提示する。遮蔽板51a,51bは、電極支持構造61a,61bにそれぞれ一体的に形成されている。
31,32 ミラー支持部、 41,42 ウインドウ、
43~46 ミラー、 51,51a,51b,52 遮蔽板、
61,62,61a,61b 電極支持構造、 71~76 アパーチャ、
G レーザガス、 L レーザ光、 L0 光軸、 V 仮想直線、
w ビーム半径。
Claims (11)
- 放電励起されたレーザガスをレーザ光が通過することによって光増幅を行うガスレーザ装置であって、
レーザ光の光軸に沿って縦列配置された第1放電電極対および第2放電電極対と、
前記第1放電電極対によって規定される第1放電領域および前記第2放電電極対によって規定される第2放電領域を挟むように対向配置され、レーザガスによって増幅されたレーザ光を反射する少なくとも2つのミラーと、
前記第1放電電極対と前記第2放電電極対との間に設置され、放電電極の電極面からレーザ光の光軸に向けて突出した遮蔽部材とを備えることを特徴とするガスレーザ装置。 - 前記遮蔽部材の突出高さは、レーザ光と干渉しない高さに設定されることを特徴とする請求項1記載のガスレーザ装置。
- 第1および第2放電電極対を支持するための電極支持構造をさらに備え、
前記遮蔽部材は、該電極支持構造と一体的に形成されていることを特徴とする請求項1または2記載のガスレーザ装置。 - 前記遮蔽部材の突出形状は、のこぎり波、三角波および正弦波からなるグループから選択された形状を有することを特徴とする請求項1~3のいずれかに記載のガスレーザ装置。
- 前記遮蔽部材は、レーザ光の光軸を挟むように複数配置されることを特徴とする請求項1~4のいずれかに記載のガスレーザ装置。
- 前記遮蔽部材は、表面がアルマイト処理されたアルミニウムで形成されていることを特徴とする請求項1~5のいずれかに記載のガスレーザ装置。
- 前記遮蔽部材の表面は、レーザ光の波長よりも粗い表面粗さを有することを特徴とする請求項1~6のいずれかに記載のガスレーザ装置。
- 前記ミラーの前方には、レーザ光が透過する開口を有するアパーチャが設けられることを特徴とする請求項1~7のいずれかに記載のガスレーザ装置。
- レーザガスは、レーザ光の光軸および放電方向の両方に対して垂直な方向に供給され、
前記第1放電電極対へのレーザガスの供給方向は、前記第2放電電極対へのレーザガスの供給方向とは反対であることを特徴とする請求項1~8のいずれかに記載のガスレーザ装置。 - 前記遮蔽部材は、第1および第2放電領域に面し、レーザ光の光軸に対して傾斜した傾斜面を有することを特徴とする請求項1~9のいずれかに記載のガスレーザ装置。
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JP2015527142A JP5985059B2 (ja) | 2013-07-18 | 2013-12-27 | ガスレーザ装置 |
CN201390001204.6U CN205452776U (zh) | 2013-07-18 | 2013-12-27 | 气体激光装置 |
US14/898,341 US9515446B2 (en) | 2013-07-18 | 2013-12-27 | Gas laser device |
KR1020167000971A KR101709046B1 (ko) | 2013-07-18 | 2013-12-27 | 가스 레이저 장치 |
TW103102905A TWI524610B (zh) | 2013-07-18 | 2014-01-27 | 氣體雷射裝置 |
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Cited By (2)
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JP6701457B1 (ja) * | 2019-05-17 | 2020-05-27 | 三菱電機株式会社 | ガスレーザ装置 |
WO2022215227A1 (ja) * | 2021-04-08 | 2022-10-13 | 三菱電機株式会社 | ガスレーザ装置 |
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JP7262217B2 (ja) * | 2018-12-17 | 2023-04-21 | 住友重機械工業株式会社 | 光共振器 |
JP7258178B2 (ja) * | 2019-11-11 | 2023-04-14 | 三菱電機株式会社 | ガスレーザ増幅器、ガスレーザ装置、euv光発生装置およびeuv露光装置 |
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TW201505301A (zh) | 2015-02-01 |
TWI524610B (zh) | 2016-03-01 |
CN205452776U (zh) | 2016-08-10 |
JPWO2015008405A1 (ja) | 2017-03-02 |
US9515446B2 (en) | 2016-12-06 |
US20160134075A1 (en) | 2016-05-12 |
KR101709046B1 (ko) | 2017-02-21 |
JP5985059B2 (ja) | 2016-09-06 |
KR20160019550A (ko) | 2016-02-19 |
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