WO2022181677A1 - 紫外線レーザ光発生装置 - Google Patents
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3532—Arrangements of plural nonlinear devices for generating multi-colour light beams, e.g. arrangements of SHG, SFG, OPO devices for generating RGB light beams
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/37—Non-linear optics for second-harmonic generation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/0005—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts
- A61L2/0011—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor for pharmaceuticals, biologicals or living parts using physical methods
- A61L2/0029—Radiation
- A61L2/0047—Ultraviolet radiation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
- G02F1/3507—Arrangements comprising two or more nonlinear optical devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/392—Parametric amplification
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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
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0092—Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
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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
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- H01S3/08—Construction or shape of optical resonators or components thereof
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/08—Radiation
- A61L2/10—Ultraviolet radiation
Definitions
- the present invention relates to an ultraviolet laser light generator.
- it relates to a laser light generator with a wavelength of 399.08 nm and a laser light generator with a wavelength of 228.04 nm.
- CROSS REFERENCE TO RELATED APPLICATIONS This application claims priority from Japanese Patent Application No. 2021-027497 filed on February 24, 2021, the entire description of which is specifically incorporated herein by reference as disclosure.
- Laser light with a wavelength in the range of 200 to 280 nm is also called deep ultraviolet, and is used in various fields such as semiconductor exposure equipment, wafer inspection, and sterilization equipment.
- Excimer lasers and semiconductor lasers are examples of light sources for deep ultraviolet laser light generators.
- excimer lasers have the disadvantages of using toxic gas and requiring maintenance costs.
- the semiconductor laser has a weak output and is difficult to develop.
- deep ultraviolet laser beams of various wavelengths can be obtained by using a laser beam generator that uses a solid-state laser oscillator having an oscillation wavelength in the 1 ⁇ m band as a basic light source in combination with a wavelength conversion element using a nonlinear crystal or the like. (Patent Documents 1 and 2).
- the laser light wavelength obtained by wavelength conversion by harmonic generation is limited to a wavelength that is an integral fraction of the wavelength of the basic light source.
- wavelength conversion is performed by an optical parametric oscillator, but at that time either the output of either the signal light or the idler light is not used, so the efficiency of the entire system is said to be low. It had its shortcomings.
- a plurality of laser oscillators may be used to obtain laser light with a desired wavelength (Patent Documents 3 and 4).
- Patent Documents 3 and 4 since it is a two-laser system, there are concerns about cost and efficiency.
- Patent Document 1 Japanese Patent Laid-Open Publication No. 09-292638
- Patent Document 2 Japanese Patent Laid-Open Publication No. 11-258645
- Patent Document 3 Japanese Patent Laid-Open Publication No. 2003-114454 The entire descriptions of 1-4 are specifically incorporated herein as disclosure.
- a first object of the present invention is to provide a laser light generator of 228.04 nm, which is a deep ultraviolet ray that has never been provided before, using a single semiconductor laser oscillator. It is an object of the present invention to provide a 399.08 nm ultraviolet laser light generator that uses a single semiconductor laser oscillator and can be used as a light source for a 228.04 nm deep ultraviolet laser light generator that has never been provided before. .
- the present invention is as follows.
- an excitation light source unit that converts a laser beam with a wavelength of 1064.2 nm into a second harmonic to generate a laser beam with a wavelength of 532.1 nm; an optical parametric oscillator that generates signal light with a wavelength of 798.15 nm and idler light with a wavelength of 1596.3 nm using laser light with a wavelength of 532.1 nm generated by the excitation light source as excitation light; a first wavelength converter that sum-frequency-generates idler light with a wavelength of 1596.3 nm and light with a wavelength of 532.1 nm to generate light with a wavelength of 399.08 nm; a second wavelength conversion section for generating .08 nm light; The optical path of the laser light in the order of the excitation light source section, the optical parametric oscillation section, the first wavelength conversion section and the second wavelength conversion section, or in the order of the excitation light source section, the optical parametric oscillation section, the second wavelength conversion section
- An ultraviolet laser light generator with a wavelength of 399.08 nm [2] The apparatus according to [1], wherein the 532.1 nm light that is sum-frequency-generated by the first wavelength conversion section is 532.1 nm light that has not been converted by the optical parametric oscillation section. [3] The device according to [1] or [2], which has an optical path of the laser beam in the order of the excitation light source section, the optical parametric oscillation section, the first wavelength conversion section, and the second wavelength conversion section. [4] [1] A laser light generator with a wavelength of 399.08 nm according to any one of [1] to 3; , an ultraviolet laser light generator with a wavelength of 228.04 nm.
- ADVANTAGE OF THE INVENTION it is possible to provide a laser generator with excellent operability that can easily and efficiently generate laser light in the wavelength range of 228.04 nm, which is deep ultraviolet rays that may be used for sterilization.
- a 399.08 nm ultraviolet laser beam generator that can be used as a light source for a 228.04 nm laser beam generator.
- FIG. 1 shows a schematic illustration of a laser generator of the present invention.
- FIG. 2 shows a schematic explanatory diagram of one embodiment of the laser generator of the present invention.
- FIG. 3 shows one embodiment of the laser generator of the present invention.
- FIG. 4 shows that the optical summation wavelength of the idler light ⁇ i of wavelength 1596.3 nm generated by the OPO and the excitation light of 532.1 nm is 399.08 nm, and the wavelength of 798.15 nm generated by the same OPO.
- FIG. 10 is an explanatory diagram showing that 399.08 nm light, which is the second harmonic of the signal light ⁇ s, matches.
- a first aspect of the laser light generator of the present invention is an ultraviolet laser light generator with a wavelength of 399.08 nm, which device comprises: an excitation light source unit that converts a laser beam with a wavelength of 1064.2 nm into a second harmonic to generate a laser beam with a wavelength of 532.1 nm; an optical parametric oscillator that generates signal light with a wavelength of 798.15 nm and idler light with a wavelength of 1596.3 nm using laser light with a wavelength of 532.1 nm generated by the excitation light source as excitation light; a first wavelength converter that sum-frequency-generates idler light with a wavelength of 1596.3 nm and light with a wavelength of 532.1 nm to generate light with a wavelength of 399.08 nm; including a second wavelength conversion section that generates 08 nm light; The optical path of the laser light in the order of the excitation light source section, the optical parametric oscillation section, the first wavelength conversion section and the second wavelength conversion section,
- a second aspect of the laser light generating device of the present invention is an ultraviolet laser light generating device with a wavelength of 228.04 nm, and this device comprises the wavelength 399.08 nm laser light generating device of the first aspect of the present invention, and A third wavelength conversion unit sum-frequency-generates the 399.08 nm light and the 532.1 nm light to generate the 228.04 nm light.
- Outline of the laser light generating device which has an optical path of the laser light in the order of the excitation light source section, the optical parametric oscillation section, the first wavelength conversion section, and the second wavelength conversion section.
- An explanatory diagram is shown in FIG.
- the laser light generating device of the first aspect of the present invention is a device including 10 to 40 in FIG. and 40 is a second wavelength converter.
- the order of the first wavelength conversion section 30 and the second wavelength conversion section 40 may be reversed.
- the laser light generator according to the second aspect of the present invention includes a third wavelength conversion section 50 in addition to 10 to 40 in FIG.
- FIG. 2 is a schematic explanatory diagram of one embodiment of the laser light generating device of the present invention.
- the excitation light source section includes SHG
- the first wavelength conversion section 30 includes SFG
- the second wavelength conversion section 40 includes SHG is included
- the third wavelength converter 50 indicates that SFG is included.
- FIG. 3 shows an explanatory diagram of one embodiment of the laser light generator of the present invention.
- the excitation light source section 10 is a section that converts a laser beam with a wavelength of 1064.2 nm into a second harmonic to generate a laser beam with a wavelength of 532.1 nm.
- An excitation light source that generates laser light with a wavelength of 1064.2 nm can be, for example, a Nd:YAG (Nd 3+ :Y 3 Al 5 O 12 ) laser.
- the laser light with a wavelength of 1064.2 nm is pulsed laser light, and the time width of the pulse can be nanoseconds or picoseconds.
- the excitation light source section 10 may include, for example, an excitation light source and a nonlinear optical crystal that converts this laser light into a 532.1 nm laser light that is a second harmonic (SHG).
- the nonlinear optical crystal can be, for example, a KTP crystal, indicated as crystal 1 in FIG.
- the crystal 1 can be, for example, BBO, LBO, MgO-added MgO:PPLT, or PPKTP, in addition to the KTP crystal.
- PP in "PP+crystal name" is an abbreviation for "Periodically Poled".
- a KTP crystal is used as the nonlinear optical crystal, as shown in FIG.
- it is converted into a 532.1 nm laser beam, which is the second harmonic.
- Phase matching in wavelength conversion is type II.
- an LBO or BBO crystal is used for the crystal 1, after the polarization direction is set perpendicular to the paper surface through a ⁇ /2 plate, the light is passed through the crystal 1 to convert it into a 532.1 nm laser beam, which is the second harmonic. .
- Type 2 phase matching means phase matching in which second harmonics are generated from incident light of different rays (i.e., different orthogonal polarizations), and incident light of the same ray (i.e., same polarization) is different from incident light. It is distinguished from Type 1 phase matching, which generates second harmonics of different polarizations. Furthermore, a phase match in which the incident light and the second harmonic all have the same extraordinary ray direction is referred to herein as Type 0.
- a dichroic mirror (M1 in FIG. 3) can be provided between the excitation light source unit 10 and the OPO20.
- the dichroic mirror M1 can reflect the 1064.2 nm light contained in the light from the excitation light source unit 10 and turn it into 532.1 nm laser light. Since the 1064.2 nm light is not used in subsequent processes, it is important to separate it from the 532.1 nm laser light to prevent unnecessary damage to optical elements and crystals when focusing lasers of other wavelengths in subsequent processes. It is possible to avoid applying a temperature load to the A 532.1 nm laser beam transmitted through the dichroic mirror M1 is incident on the OPO.
- the OPO 20 is a part that generates a signal light with a wavelength of 798.15 nm and an idler light with a wavelength of 1596.3 nm by using a laser beam with a wavelength of 532.1 nm generated in the excitation light source as excitation light, and separates the generated signal light.
- the OPO is composed of a nonlinear optical crystal and two mirrors.
- the nonlinear optical crystal can be, for example, a BBO crystal or a BiBO crystal, or else either MgO:PPLT or PPKTP.
- the crystal 2 is cut at a phase matching angle to generate a signal light ⁇ s with a wavelength of 798.15 nm and an idler light ⁇ i with a wavelength of 1596.3 nm.
- MgO:PPLT and PPKTP are adjusted so as to have a polarization inversion period length capable of generating the above signal light and idler light wavelengths.
- Two wavelengths emitted from this crystal are amplified by a resonator composed of two mirrors to obtain OPO oscillation.
- the crystal 2 constituting the optical parametric oscillation unit 20 has a phase matching process of type 1. When the excitation light is horizontally polarized on the plane of the paper, the signal light and the idler light are polarized in the direction perpendicular to the plane of the paper. is doing.
- the wavelength accuracy of the signal light of the optical parametric oscillator 20 is narrowed by the seed light from the semiconductor laser, and the crystal 2 is desirably controlled to approximately 0.1 nm or less by temperature tuning. As a result, the spectral width and variation of the violet light wavelength of 399.08 nm can be reduced to about 0.05 nm or less.
- the first wavelength conversion unit 30 converts the idler light with a wavelength of 1596.3 nm generated from the OPO and the light with a wavelength of 532.1 nm generated by the excitation light source unit that has passed through the OPO into light with a wavelength of 399.08 nm through optical sum-frequency mixing. is the part that generates The 532.1 nm light that is sum-frequency generated by the first wavelength converter 30 is the 532.1 nm light that has not been converted by the OPO 20 .
- a nonlinear optical crystal such as a BBO crystal, for example, can be used for the crystal 3 shown in FIG.
- the second wavelength conversion section 40 is an SHG section for converting signal light with a wavelength of 798.15 nm to a wavelength of 399.08 nm.
- a nonlinear optical crystal such as an LBO or BBO crystal can be used.
- LBO or BBO it can be, for example, a nonlinear optical crystal such as MgO:PPLT.
- MgO:PPLT MgO:PPLT is used as the crystal 2 of the optical parametric oscillator 20 .
- the crystal 4 is adjusted to a poling period length that generates SHG with a wavelength of 798.15 nm.
- the polarization direction of the 399.08 nm light is horizontal to the plane of the paper.
- the order of the first wavelength conversion section 30 and the second wavelength conversion section 40 can be changed. That is, in the ultraviolet laser light generating device (first aspect) of the present invention having a wavelength of 399.08 nm, the excitation light source section 10, the optical parametric oscillation section 20, the first wavelength conversion section 30 and the second wavelength conversion section 40 are arranged in this order, Alternatively, the optical path of the laser light can be provided in the order of the excitation light source section 10, the optical parametric oscillation section 20, the second wavelength conversion section 40, and the first wavelength conversion section 30.
- the order of the first wavelength conversion unit 30 and the second wavelength conversion unit 40 can be changed.
- the third wavelength converter 50 converts the light with a wavelength of 532.1 nm generated by the excitation light source that has passed through the OPO 20, the first wavelength converter 30 and the second wavelength converter 40 into the first wavelength converter 30 and the second wavelength converter. This is a portion for generating light with a wavelength of 228.04 nm from the light with a wavelength of 399.08 nm generated in the portion 40 by optical sum frequency mixing.
- the 532.1 nm light generated by the sum frequency in the third wavelength conversion section 50 is the 532.1 nm light that has not been converted by the OPO 20 and has passed through the first wavelength conversion section 30 and the second wavelength conversion section 40 .
- a nonlinear optical crystal such as BBO or KBBF crystal can be used.
- the separation unit 60 Behind the third wavelength conversion section 50 is a separation section 60 (not shown in FIGS. 1 and 2) for separating laser light of various wavelengths generated during the process of wavelength conversion and taking out 228.04 nm light. ) can be provided.
- the separation unit 60 can be, for example, a prism (see FIG. 3). There is no particular limitation as long as the prism can remove laser light with a wavelength other than 228.04 nm generated in the process of wavelength conversion. instead, it can be, for example, a quartz prism, a MgF2 prism, or the like.
- the separation unit 60 separates light with wavelengths other than 228.04 nm to obtain laser light with a wavelength of 228.04 nm.
- FIG. 3 is a case where the optical parametric oscillator is of type 1 phase matching, but when the optical parametric oscillator is of type 0 phase matching, the crystals 3 and 4 are both MgO:PPLT Use
- these examples are merely illustrations, and the present invention is not intended to be limited to these examples.
- SFG has the following relationship when the incident light wavelength is ⁇ 1 , another incident light wavelength is ⁇ 2 , and the optical sum frequency wavelength is ⁇ 3 .
- the OPO excited at 532.1 nm which is the second harmonic of the 1064.2 nm laser beam, generates the signal light ⁇ s of 798.15 nm and the idler light ⁇ i of 1596.3 nm.
- the wavelength of the optical sum frequency generated from the idler light ⁇ i having a wavelength of 1596.3 nm and the excitation light of 532.1 nm is 399.08 nm, and this wavelength is 798 nm in the second wavelength converter.
- the characteristic that the second harmonic generated from the signal light ⁇ s of 0.15 nm coincides with the wavelength of 399.08 nm is utilized (see FIG. 4). Therefore, a more efficient ultraviolet laser light generator with a wavelength of 399.08 nm can be realized.
- both the output light of the OPO signal light and the idler light can be used to generate ultraviolet light with a wavelength of 399.08 nm.
- the sum frequency generation of light generated from allows the generation of deep UV light with a wavelength of 228.04 nm. Therefore, a more efficient deep ultraviolet laser light generator with a wavelength of 228.04 nm can be realized.
- the laser light with a wavelength of 399.08 nm obtained by the device of the present invention can be used as a light source with other wavelengths in combination with a nonlinear crystal or the like.
- the laser light with a wavelength of 228.04 nm obtained by the device of the present invention is close to the wavelength of 222 nm, it is considered to have a sterilizing effect.
- both signal light and idler light can be used, so it is possible to generate deep ultraviolet laser light more efficiently. For this reason, it is possible to irradiate ultraviolet rays with a wavelength of 399.08 nm or 228.04 nm over a wide range and to irradiate liquids such as water, and it is useful for applications such as entrances and exits of unspecified facilities and sterilization of liquids. . Additionally, the generated laser light can, if desired, be directed at the target via a laser light guide such as a fiber. Therefore, for example, it becomes easy to irradiate ultraviolet rays to a portion such as the back side of the structure.
- the present invention is effective not only in the medical field but also in disinfection work in large facilities.
- it since it has little effect on the human body, it does not use toxic gases such as ethylene oxide such as ozone, so it has no effect on the human body and is easy to handle.
- toxic gases such as ethylene oxide such as ozone
- it since it does not use liquids such as alcohol disinfection, it can also be used for disinfecting paper media such as books that should not be wet.
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Abstract
Description
関連出願の相互参照
本出願は、2021年2月24日出願の日本特願2021-027497号の優先権を主張し、その全記載は、ここに特に開示として援用される。
特許文献2:日本特開平11-258645号公報
特許文献3:日本特開2003-114454号公報
特許文献4:日本特開2007-086104号公報
特許文献1~4の全記載は、ここに特に開示として援用される。
[1]
波長1064.2nmのレーザ光を第2高調波に変換して波長532.1nmのレーザ光を生成する励起光源部、
励起光源部で生成した波長532.1nmのレーザ光を励起光として波長798.15nmのシグナル光と波長1596.3nmのアイドラー光を発生させる光パラメトリック発振部、
波長1596.3nmのアイドラー光と532.1nm光を和周波発生させて、波長399.08nm光を発生させる第1波長変換部、及び
波長798.15nmのシグナル光から第2高調波である波長399.08nm光を発生させる第2波長変換部を含み、
励起光源部、光パラメトリック発振部、第1波長変換部及び第2波長変換部の順、または励起光源部、光パラメトリック発振部、第2波長変換部及び第1波長変換部の順にレーザ光の光路を有する、波長399.08nmの紫外線レーザ光発生装置。
[2]
第1波長変換部で和周波発生させる532.1nm光は、光パラメトリック発振部で変換されなかった532.1nm光である、[1]に記載の装置。
[3]
励起光源部、光パラメトリック発振部、第1波長変換部及び第2波長変換部の順にレーザ光の光路を有する、[1]または[2]に記載の装置。
[4]
[1]~3のいずれかに記載の波長399.08nmレーザ光発生装置、及び
399.08nm光と532.1nm光を和周波発生させて228.04nm光を発生させる第3波長変換部を含む、波長228.04nmの紫外線レーザ光発生装置。
[5]
第3波長変換部で和周波発生させる532.1nm光は、光パラメトリック発振部で変換されなかった532.1nm光である、[4]に記載の装置。
[6]
第3波長変換部の後部に228.04nm光とその他の波長の光を分離する分離部を含む、[4]または[5]に記載の装置。
波長1064.2nmのレーザ光を第2高調波に変換して波長532.1nmのレーザ光を生成する励起光源部、
励起光源部で生成した波長532.1nmのレーザ光を励起光として波長798.15nmのシグナル光と波長1596.3nmのアイドラー光を発生させる光パラメトリック発振部、
波長1596.3nmのアイドラー光と532.1nm光を和周波発生させて、波長399.08nm光を発生させる第1波長変換部、及び
波長798.15nmシグナル光から第2高調波である波長399.08nm光を発生させる第2波長変換部を含み、
励起光源部、光パラメトリック発振部、第1波長変換部及び第2波長変換部の順、または励起光源部、光パラメトリック発振部、第2波長変換部及び第1波長変換部の順にレーザ光の光路を有する。
図3には、本発明のレーザ光発生装置の一態様の説明図を示す。
SHG:第2高調波発生(Second Harmonic Generation)
SFG:光和周波発生(Sum Frequency Generation)
OPO:光パラメトリック発振部(optical parametric oscillator)
KTP:KTiOPO4
BBO:β-BaB2O4
LBO:LiB3O5
BiBO:BiB3O6
MgO:PPLT: MgO添加周期反転(Periodically Poled)LiTaO3
KBBF:KBe2BO3F2
励起光源部10は、波長1064.2nmのレーザ光を第2高調波に変換して波長532.1nmのレーザ光を生成する部位である。波長1064.2nmのレーザ光を発生する励起光源は、例えば、Nd:YAG(Nd3+:Y3Al5O12)レーザであることができる。波長1064.2nmのレーザ光は、パルスレーザ光であり、パルスの時間幅はナノ秒又はピコ秒であることができる。励起光源部10は、例えば、励起光源と、このレーザ光を第2高調波(SHG)である532.1nmレーザ光に変換する非線形光学結晶を含むものであることができる。非線形光学結晶は、例えば、KTP結晶であることができ、図3では結晶1として示される。結晶1は、KTP結晶以外に、例えば、BBO、LBO、MgO添加MgO:PPLT、PPKTPのいずれかであることもできる。尚、「PP+結晶名」のPPは、周期反転「Periodically Poled」の略である。
励起光源部10とOPO20の間にダイクロイックミラー(図3中のM1)を設けることができる。ダイクロイックミラーM1では、励起光源部10からの光に含まれる1064.2nm光を反射し、532.1nmレーザ光とすることができる。1064.2nm光は以降のプロセスで使用しないので、532.1nmレーザ光から分離しておくことが、これ以降のプロセスで他の波長のレーザを集光する場合に光学素子に不要なダメージや結晶への温度負荷がかかることを回避できる。ダイクロイックミラーM1を透過した532.1nmレーザ光をOPOに入射する。
OPO20は、励起光源部で生成した波長532.1nmのレーザ光を励起光として波長798.15nmのシグナル光と波長1596.3nmのアイドラー光を発生させ、かつ発生したシグナル光を分離する部位である。OPOは、非線形光学結晶と2枚のミラーで構成される。非線形光学結晶は例えば、BBO結晶又はBiBO結晶であることができ、それ以外にもMgO:PPLT又はPPKTPのいずれかを挙げることができる。結晶2は波長798.15nmのシグナル光λsと波長1596.3nmのアイドラー光λiを発生させる位相整合角にカットされている。尚、MgO:PPLT及びPPKTPは、上記のシグナル光及びアイドラー光波長を発生させることができる分極反転周期長を有するように調整される。この結晶から発せられた2つの波長は2枚のミラーで構成されている共振器で増幅され、OPO発振が得られる。光パラメトリック発振部20を構成する結晶2は、表1に示すように、位相整合はタイプ1のプロセスの場合、励起光は紙面に水平偏光とするとシグナル光及びアイドラー光は紙面に垂直方向に偏光している。
第1波長変換部30は、OPOから発生した波長1596.3nmのアイドラー光とOPOを透過した励起光源部で生成した波長532.1nmの光とから、光和周波混合により波長399.08nmの光を発生させる部位である。第1波長変換部30で和周波発生させる532.1nm光は、OPO20で変換されなかった532.1nm光である。図3に示す結晶3には、例えば、BBO結晶などの非線形光学結晶を用いることができる。結晶3は、BBO以外に、MgO:PPLTを用いる場合、光パラメトリック発振部20の結晶2としてMgO:PPLTを使用する。そのとき、結晶3は、波長1596.3nmのアイドラー光と波長532.1nmの光和周波が発生する分極反転周期長に調整されている。このときの、399.08nm光の偏光方向は紙面に水平方向である。
第2波長変換部40は、波長798.15nmのシグナル光から波長399.08nmのSHG部位である。図3に示す結晶4には、例えば、LBO又はBBO結晶などの非線形光学結晶を用いることができる。LBO又はBBO以外に、例えば、MgO:PPLTなどの非線形光学結晶であることができる。結晶4がMgO:PPLTの場合、光パラメトリック発振部20の結晶2としてMgO:PPLTを使用する。そのとき、結晶4は、波長798.15nmのSHGが発生する分極反転周期長に調整されている。このときも、399.08nm光の偏光方向は紙面に水平方向である。
第3波長変換部50は、OPO20、第1波長変換部30及び第2波長変換部40を透過した励起光源部で生成した波長532.1nmの光と第1波長変換部30及び第2波長変換部40で発生した波長399.08nmの光とから、光和周波混合により228.04nmの光を発生させる部位である。第3波長変換部50で和周波発生させる532.1nm光は、OPO20で変換されず、かつ第1波長変換部30及び第2波長変換部40を透過した532.1nm光である。図3に示す結晶5には、例えば、BBOやKBBF結晶などの非線形光学結晶を用いることができる。
第3波長変換部50の後部に、波長変換のプロセスの途中で発生したいろいろな波長のレーザ光を分離して、228.04nm光を取り出すための分離部60(図1及び2には図示せず)を設けることができる。分離部60は、例えば、プリズムであることができる(図3参照)プリズムは、波長変換のプロセスで発生した228.04nm以外の波長のレーザ光を取り除くことができるものであれば、特に制限はなく、例えば、石英プリズム、MgF2プリズムなどであることができる。分離部60で228.04nm以外の波長の光を分離して、波長228.04nmのレーザ光を得る。
OPOにおいて、励起光波長λp、シグナル光波長λs及びアイドラー光波長λiのときに、以下の関係がある。
20 光パラメトリック発振部
30 第1波長変換部
40 第2波長変換部
50 第3波長変換部
Claims (6)
- 波長1064.2nmのレーザ光を第2高調波に変換して波長532.1nmのレーザ光を生成する励起光源部、
励起光源部で生成した波長532.1nmのレーザ光を励起光として波長798.15nmのシグナル光と波長1596.3nmのアイドラー光を発生させる光パラメトリック発振部、
波長1596.3nmのアイドラー光と532.1nm光を和周波発生させて、波長399.08nm光を発生させる第1波長変換部、及び
波長798.15nmのシグナル光から第2高調波である波長399.08nm光を発生させる第2波長変換部を含み、
励起光源部、光パラメトリック発振部、第1波長変換部及び第2波長変換部の順、または励起光源部、光パラメトリック発振部、第2波長変換部及び第1波長変換部の順にレーザ光の光路を有する、波長399.08nmの紫外線レーザ光発生装置。 - 第1波長変換部で和周波発生させる532.1nm光は、光パラメトリック発振部で変換されなかった532.1nm光である、請求項1に記載の装置。
- 励起光源部、光パラメトリック発振部、第1波長変換部及び第2波長変換部の順にレーザ光の光路を有する、請求項1または2に記載の装置。
- 請求項1~3のいずれかに記載の波長399.08nmレーザ光発生装置、及び
399.08nm光と532.1nm光を和周波発生させて波長228.04nm光を発生させる第3波長変換部を含む、波長228.04nmの紫外線レーザ光発生装置。 - 第3波長変換部で和周波発生させる532.1nm光は、光パラメトリック発振部で変換されなかった532.1nm光である、請求項4に記載の装置。
- 第3波長変換部の後部に228.04nm光とその他の波長の光を分離する分離部を含む、請求項4または5に記載の装置。
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