WO2012128354A1 - 紫外レーザ装置 - Google Patents
紫外レーザ装置 Download PDFInfo
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- WO2012128354A1 WO2012128354A1 PCT/JP2012/057523 JP2012057523W WO2012128354A1 WO 2012128354 A1 WO2012128354 A1 WO 2012128354A1 JP 2012057523 W JP2012057523 W JP 2012057523W WO 2012128354 A1 WO2012128354 A1 WO 2012128354A1
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- wavelength conversion
- wavelength
- optical element
- conversion optical
- laser beam
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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
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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
- G02F1/37—Non-linear optics for second-harmonic generation
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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
- G02F1/3534—Three-wave interaction, e.g. sum-difference frequency generation
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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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/16—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 series; tandem
Definitions
- the present invention includes a laser light output unit that outputs laser light having an infrared wavelength, and a wavelength conversion optical element that converts the wavelength of infrared laser light output from the laser light output unit into laser light having an ultraviolet wavelength.
- the present invention relates to an ultraviolet laser device including a wavelength conversion unit.
- an ultraviolet laser apparatus including the laser beam output unit and the wavelength conversion unit as described above
- a laser apparatus that is suitably used for an exposure apparatus, an inspection apparatus, a treatment apparatus, and the like is known.
- Such a laser device generally amplifies an infrared wavelength laser beam emitted from a laser light source such as a DFB semiconductor laser by a fiber optical amplifier, and arranges the amplified infrared laser beam in a wavelength conversion unit.
- the wavelength conversion is performed by the wavelength conversion optical element thus configured to output laser light having an ultraviolet wavelength.
- the fiber optical amplifier is an erbium (Er) -doped fiber optical amplifier (generally abbreviated as “EDFA”) that amplifies infrared laser light having a wavelength of 1.55 ⁇ m due to the history of optical fiber development. Is widely used.
- Er erbium
- EDFA erbium -doped fiber optical amplifier
- the wavelength conversion unit of the ultraviolet laser device is configured to convert the wavelength of the infrared laser beam output from the laser beam output unit into an ultraviolet laser beam having a wavelength band of 190 to 200 nm (patent).
- Reference 1 and Patent Reference 2 With such a configuration, a small, all-solid-state ultraviolet laser device that is easy to handle and outputs ultraviolet laser light in the above-described wavelength band is realized.
- the wavelength conversion unit as disclosed in Patent Document 1, but generally, a plurality of propagation paths are formed, Each is provided with a wavelength conversion optical element, and is configured to output the ultraviolet laser light by superimposing the fundamental wave and higher harmonics generated in each propagation path a plurality of times. For this reason, the subject that the structure of a wavelength conversion part is complicated, and the subject that it was difficult to obtain high wavelength conversion efficiency when it looked at the whole wavelength conversion part occurred.
- a laser beam output unit that outputs a laser beam having an infrared wavelength, and an infrared beam that has a wavelength conversion optical element and is output from the laser beam output unit.
- An ultraviolet laser device comprising a wavelength conversion unit that converts a laser beam into an ultraviolet wavelength laser beam and outputs the laser beam, and the laser beam output unit outputs a first infrared laser beam having a wavelength of 1900 to 2000 nm
- a first laser beam output unit that outputs a second laser beam output unit that outputs a second infrared laser beam having a wavelength of 1000 to 1100 nm, and the wavelength conversion unit outputs the second laser beam output unit from the first laser beam output unit.
- the first sequence in which the first infrared laser beam is incident and propagated, the laser beam propagated in the first sequence, and the second infrared laser beam output from the second laser beam output unit are combined and incident and propagated.
- 2 series and incident on wavelength converter First and second infrared laser light is, by being wavelength converted by the wavelength conversion optical element provided in the wavelength conversion unit, and a second series as the ultraviolet laser beam is outputted.
- the wavelength conversion optical element provided in the wavelength conversion unit generates the second harmonic of the first infrared laser light.
- the first wavelength conversion optical element and the second wavelength conversion optical element are provided in the first series, and the third wavelength conversion optical element and the second wavelength conversion optical element A four-wavelength converting optical element is provided in the second series.
- the first wavelength conversion optical element, the second wavelength conversion optical element, and the third wavelength conversion optical element are provided in a first series.
- the fourth wavelength conversion optical element is provided in the second series.
- the phase matching in the third wavelength conversion optical element and the phase matching in the fourth wavelength conversion optical element are non-critical phase matching (NCPM). : Non-Critical Phase Matching).
- the phase matching in the first wavelength conversion optical element and the phase matching in the second wavelength conversion optical element are quasi phase matching (QPM: Quasi Phase Matching).
- the first laser light output unit is configured to include a thulium-doped fiber optical amplifier.
- the second laser light output unit is configured to include an ytterbium-doped fiber optical amplifier.
- the ultraviolet laser light is configured as deep ultraviolet light having a wavelength of 190 to 200 nm.
- laser light in the ultraviolet region generated by the third wavelength conversion optical element is referred to as “ultraviolet laser light”.
- front-stage ultraviolet laser light For convenience, it is described as “front-stage ultraviolet laser light”.
- the aspect of the present invention it is possible to provide a new means capable of outputting ultraviolet laser light with a simple configuration in which superposition is performed only once.
- the wavelength conversion unit is configured by the first to fourth wavelength conversion optical elements, it is possible to provide a new means capable of outputting ultraviolet laser light with a simple configuration having only four wavelength conversion optical elements. Can do.
- the optical elements such as a mirror and a condensing lens for superimposing the beams can be arranged in the infrared to visible region, and an ultraviolet laser device capable of stable operation over a long period of time with a simple and inexpensive configuration can be provided.
- the beam quality and wavelength An ultraviolet laser device with high conversion efficiency can be provided.
- the first laser light output unit is configured to have a thulium-doped fiber optical amplifier
- the second laser light output unit is configured to have an ytterbium-doped fiber optical amplifier
- FIG. 1 is an overall view of an ultraviolet laser apparatus exemplified as an embodiment of the present invention.
- FIG. 2 is a schematic configuration diagram illustrating the ultraviolet laser device of the first configuration example.
- FIG. 3 is a schematic configuration diagram illustrating the ultraviolet laser device of the second configuration example.
- FIG. 4 is a schematic configuration diagram illustrating the ultraviolet laser device of the third configuration example.
- the ultraviolet laser device LS includes a laser beam output unit 1 that outputs infrared laser beam La (La1, La2), a wavelength conversion optical element, and an infrared laser beam that is output from the laser beam output unit 1 as an ultraviolet laser beam.
- a wavelength conversion unit 3 that converts the wavelength to Lv and outputs it, a laser beam output unit 1, a control unit 8 that controls the operation of the wavelength conversion unit 3, and the like are included.
- the laser beam output unit 1 includes a first laser beam output unit 1a that outputs a first fundamental wave infrared laser beam (first infrared laser beam) La1 having a wavelength of 1900 to 2000 nm, and a first laser beam output unit 1a having a wavelength of 1000 to 1100 nm. It comprises a second laser beam output section 1b that outputs two fundamental wave infrared laser beams (second infrared laser beams) La2.
- the specific wavelengths of the first infrared laser beam La1 and the second infrared laser beam La2 are appropriately set according to the wavelength of the ultraviolet laser beam Lv output from the ultraviolet laser device LS and the configuration of the wavelength conversion unit 3. Can do.
- the laser light output unit 1 includes a laser light generation unit 10 that outputs seed light and an amplification unit 20 that amplifies the seed light output from the laser light generation unit 10. .
- the laser light generator 10 includes a first laser light source 11 that generates a first fundamental wave seed light Ls1 and a second laser light source 12 that generates a second fundamental wave seed light Ls2.
- the amplifying unit 20 includes a first fiber optical amplifier 21 provided corresponding to the first laser light source and a second fiber optical amplifier 22 provided corresponding to the second laser light source.
- the first fundamental wave seed light Ls1 generated by the first laser light source 11 is amplified to a predetermined output by the first fiber optical amplifier 21, and is amplified. Infrared laser beam La1 is output.
- the second fundamental wave seed light Ls2 generated by the second laser light source 12 is amplified to a predetermined output by the second fiber optical amplifier 22, and is amplified. Light La2 is output.
- the pumping light source in the first fiber optical amplifier 21 and the second fiber optical amplifier 22 is not shown.
- the first laser light source 11 can preferably use a DFB (Distributed Feedback) semiconductor laser having an oscillation wavelength of 2 ⁇ m
- the second laser light source 12 can preferably use a DFB semiconductor laser having an oscillation wavelength of 1.1 ⁇ m.
- the DFB semiconductor laser can generate seed light having a narrow wavelength by oscillating in a state in which the temperature is controlled by a temperature regulator using a Peltier element or the like.
- the DFB semiconductor laser can be oscillated or pulsed at an arbitrary intensity by controlling the waveform of the excitation current.
- the laser light generator 10 is provided with an external modulator such as EOM (Electro-Optic Modulator), and the output light of the laser light source oscillated or pulsed CW (Continuous Wave) is cut out by the external modulator and pulsed light having a required waveform. May be output.
- EOM Electro-Optic Modulator
- a thulium-doped fiber optical amplifier in which thulium (Tm) is doped in the core of the amplification optical fiber can be suitably used.
- the thulium-doped fiber optical amplifier has a gain in a wavelength band of 1900 to 2000 nm, amplifies the seed light Ls1 having a predetermined wavelength within the wavelength band emitted from the first laser light source 11, and the amplified first light Ls1 is amplified.
- 1 infrared laser beam La1 is output to the wavelength converter 3.
- an ytterbium-doped fiber optical amplifier in which the core of the amplification optical fiber is doped with ytterbium (Yb) can be suitably used.
- the ytterbium-doped fiber optical amplifier has a gain in a wavelength band of 1000 to 1100 nm, amplifies the seed light Ls2 having a predetermined wavelength in the wavelength band emitted from the second laser light source 12, and amplifies the amplified first light Ls2.
- the 2-infrared laser beam La2 is output to the wavelength converter 3.
- the laser light output units 1a and 1b are configured by the laser light sources 11 and 12 and the fiber optical amplifiers 21 and 22. It may be configured.
- the wavelength conversion unit 3 is provided with a wavelength conversion optical system 30 (30A to 30C) including a plurality of wavelength conversion optical elements and mirrors.
- 2 to 4 show schematic configurations of the wavelength conversion optical systems 30A to 30C in the ultraviolet laser devices LS1 to LS3 of the first to third configuration examples using the wavelength conversion optical systems 30A to 30C, respectively.
- an ellipse on the optical path is a collimator lens or a condenser lens, and a description thereof will be omitted.
- Each of the wavelength conversion optical systems 30A to 30C includes the first series I in which the first infrared laser light La1 output from the first laser light output unit 1a is incident and propagated, the laser light propagated through the first series, and the second The second infrared laser beam La2 output from the laser beam output unit 1b is combined with the second series II to be propagated.
- the first infrared laser beam La1 and the second infrared laser beam La2 incident on the wavelength conversion unit 3 are sequentially wavelength-converted by the wavelength conversion optical element provided in the wavelength conversion unit 3, and the second series II to the ultraviolet laser beam. Lv is output.
- the ultraviolet laser light can be output with a simple configuration in which the superposition is performed only once.
- the wavelength conversion optical systems 30A to 30C are mainly composed of four wavelength conversion optical elements 31 to 34, respectively.
- the first wavelength conversion optical element 31 is a wavelength conversion optical element that generates a second harmonic of the first infrared laser light La1 (first fundamental wave) by second harmonic generation (SHG).
- the second wavelength conversion optical element 32 generates the second harmonic of the second harmonic emitted from the first wavelength conversion optical element 31 by the second harmonic generation, that is, the fourth harmonic of the first fundamental wave. It is a wavelength conversion optical element.
- the third wavelength converting optical element 33 is the second harmonic of the fourth harmonic emitted from the second wavelength converting optical element 32 by the second harmonic generation, that is, the previous harmonic that is the eighth harmonic of the first fundamental wave. This is a wavelength conversion optical element that generates ultraviolet laser light.
- the fourth wavelength conversion optical element 34 generates a sum frequency (SFG: Sum Frequency Generation) of the front-stage ultraviolet laser light emitted from the third wavelength conversion optical element 33 and the second infrared laser light La2 (second fundamental wave). Is a wavelength conversion element that generates ultraviolet laser light Lv. According to such a configuration, the wavelength conversion optical element can output ultraviolet laser light with only four simple configurations.
- FSG Sum Frequency Generation
- the ultraviolet laser device LS schematically configured as described above, high-power infrared laser light of 100 W or more can be obtained relatively easily as the first fiber optical amplifier 21 and the second fiber optical amplifier 22.
- An ytterbium-doped fiber optical amplifier and a thulium-doped fiber optical amplifier are used. For this reason, it is possible to realize a significant increase in output of the all-solid-state ultraviolet laser device, which has been considered to have reached the limit of the increase in output.
- the specific configuration of the ultraviolet laser device LS having the above-described characteristics is that the wavelength ⁇ 1 of the first infrared laser beam (first fundamental wave) La1 output from the first laser beam output unit 1a, the second laser beam.
- the wavelength ⁇ 2 of the second infrared laser beam (second fundamental wave) La2 output from the output unit 1b and the wavelength ⁇ v of the ultraviolet laser beam Lv output from the wavelength conversion unit 3 are set, an extremely large number Combinations are possible.
- the wavelength of the first fundamental wave ⁇ 1 1902 nm output from the first laser beam output unit 1a, and the wavelength of the second fundamental wave output from the second laser beam output unit 1b.
- ⁇ 2 1079 nm
- the wavelength ⁇ v of the ultraviolet laser light Lv output from the wavelength conversion unit 3 is 194.9 nm.
- the first infrared laser beam La1 amplified by an optical amplifier) 21 and amplified to a predetermined output is incident on the wavelength conversion optical system 30 (30A to 30C).
- the wavelength conversion optical system 30A of the first configuration example includes three wavelength conversion optical elements 31 to 33 in the first series I on which the first infrared laser light (first fundamental wave) La1 is incident, and the second infrared laser light (first fundamental wave) La1 is provided.
- a wavelength conversion optical element 34 is provided in the second series II into which the laser beam (second fundamental wave) La2 is combined and incident.
- the first wavelength conversion optical element 31 converts the wavelength of the first fundamental wave (first infrared laser beam) having an angular frequency ⁇ 1 into a second harmonic having an angular frequency of 2 ⁇ 1.
- a PPLN Periodically Poled LN: LiNbO3 having a periodically poled structure
- QPM quasi phase matching
- a wave is generated.
- the second harmonic wave having a wavelength of 951 nm generated by the first wavelength conversion optical element 31 is incident on the second wavelength conversion optical element 32.
- the second wavelength conversion optical element 32 converts the wavelength of the second harmonic having the angular frequency 2 ⁇ 1 generated by the first wavelength conversion optical element 31 into the fourth harmonic having the angular frequency of 4 ⁇ 1.
- a PPLT Periodically Polled LT: LiTaO3 having a periodically poled structure
- the fourth harmonic wave having a wavelength of 475.5 nm generated by the second wavelength conversion optical element 32 is condensed and incident on the third wavelength conversion optical element 33.
- the third wavelength conversion optical element 33 converts the wavelength of the fourth harmonic of the angular frequency 4 ⁇ 1 generated by the second wavelength conversion optical element 32 into the eighth harmonic of the angular frequency 8 ⁇ 1.
- a CLBO (CsLiB6O10) crystal is used as the third wavelength conversion optical element 33, and the phase matching condition is adjusted by non-critical phase matching (NCPM).
- NCPM non-critical phase matching
- the eighth harmonic is generated.
- the eighth harmonic wave having a wavelength of 237.8 nm generated by the third wavelength conversion optical element 33 enters the dichroic mirror 41.
- the dichroic mirror 41 is configured to transmit the eighth harmonic of the first fundamental wave having a wavelength of 237.8 nm and reflect the second infrared laser light (second fundamental wave) having a wavelength of 1079 nm.
- the eighth harmonic wave (8 ⁇ 1) of the first fundamental wave is transmitted through the dichroic mirror 41 and focused on the fourth wavelength conversion optical element 34 provided in the second series II.
- the second fundamental wave reflected by the dichroic mirror 41 is superposed coaxially with the eighth harmonic wave of the first fundamental wave transmitted through the dichroic mirror 41 and focused on the fourth wavelength conversion optical element 34 of the second series II. To do.
- the transmission wavelength of the dichroic mirror 41 is shorter than the wavelength of the second fundamental wave, and is arbitrary within the wavelength band including the wavelength of the eighth harmonic of the first fundamental wave.
- the transmission wavelength is set to less than 350 nm (reflection wavelength is 350 nm or more), and the first fundamental wave ( ⁇ 1), the second harmonic (2 ⁇ 1), and the fourth harmonic (4 ⁇ 1) are reflected to absorb the light. If it is configured to absorb the laser light, it is possible to prevent the laser light having an unnecessary wavelength from entering the wavelength conversion optical element of the second series II (the laser light having the wavelength is emitted from the wavelength conversion unit 3).
- the fourth wavelength conversion optical element 34 provided in the second series II includes an eighth harmonic wave of the first fundamental wave transmitted through the dichroic mirror 41 and a second fundamental wave that is reflected by the dichroic mirror 41 and superimposed on the same axis. Then, an ultraviolet laser beam having a wavelength of 194.9 nm is generated.
- a CLBO (CsLiB6O10) crystal is used as the third wavelength conversion optical element 33, and the phase matching condition is adjusted by non-critical phase matching (NCPM).
- the fourth wavelength conversion optical element 34 generates a sum frequency of the eighth harmonic of the first fundamental wave having a wavelength of 237.8 nm and the second fundamental wave having a wavelength of 1079 nm, and generates an ultraviolet laser beam having a wavelength of 194.9 nm. Is done.
- the ultraviolet laser beam with a wavelength of 194.9 nm generated by the fourth wavelength conversion optical element 34 is output from the end of the second series II, and the ultraviolet laser beam with a wavelength of 194.9 nm is output from the wavelength conversion optical system 30A of the ultraviolet laser device LS1. Lv is output.
- the phase matching in the first and second wavelength conversion optical elements 31 and 32 is quasi phase matching (QPM), and the third and fourth wavelength conversion optical elements.
- the phase matching at 33 and 34 is non-critical phase matching (NCPM), and all four wavelength conversion optical elements are used in phase matching that does not cause a walk-off.
- the wavelength conversion optical system 30A performs wavelength conversion with extremely high efficiency to obtain high output efficiency and high beam quality. An effect that ultraviolet laser light can be obtained can be achieved.
- an ultraviolet laser device LS2 including the wavelength conversion optical system 30B of the second configuration example will be described with reference to FIG.
- the wavelength conversion optical system 30B of the second configuration example two wavelength conversion optical elements 31 and 32 are provided in the first series I on which the first infrared laser light (first fundamental wave) La1 is incident, and the second infrared laser light is supplied.
- Two wavelength conversion optical elements 33 and 34 are provided in the second series II into which the laser beam (second fundamental wave) La2 is combined and incident.
- the first wavelength conversion optical element 31 converts the wavelength of the first fundamental wave having the angular frequency ⁇ 1 into the second harmonic having the angular frequency 2 ⁇ 1.
- the first wavelength conversion optical element 31 uses a PPLN crystal as in the configuration example described above, and adjusts the phase matching condition by quasi phase matching (QPM).
- QPM quasi phase matching
- a wave is generated.
- the second harmonic wave having a wavelength of 951 nm generated by the first wavelength conversion optical element 31 is incident on the second wavelength conversion optical element 32.
- the second wavelength conversion optical element 32 converts the wavelength of the second harmonic having the angular frequency 2 ⁇ 1 generated by the first wavelength conversion optical element 31 into the fourth harmonic having the angular frequency of 4 ⁇ 1.
- an LBO (LiB 3 O 5) crystal is used as the second wavelength conversion optical element 32, and phase matching conditions are adjusted by Type I phase matching.
- the fourth harmonic beam emitted from the second wavelength conversion optical element 32 is slightly ovalized by the walk-off, but the walk-off angle is as small as about 9 m rad, and the circular beam is formed by the two cylindrical lenses.
- the light is corrected and enters the dichroic mirror 42.
- the dichroic mirror 42 is configured to transmit the fourth harmonic of the first fundamental wave having a wavelength of 475.5 nm and reflect the second infrared laser light (second fundamental wave) having a wavelength of 1079 nm.
- the fourth harmonic wave (4 ⁇ 1) of the first fundamental wave is transmitted through the dichroic mirror 42 and focused on the third wavelength conversion optical element 33 provided in the second series II.
- the second fundamental wave reflected by the dichroic mirror 42 is superposed coaxially with the fourth harmonic of the first fundamental wave transmitted through the dichroic mirror 42 and focused on the second wavelength II third wavelength conversion optical element 33.
- the transmission wavelength of the dichroic mirror 42 is shorter than the wavelength of the second fundamental wave, and is arbitrary within a wavelength band including the wavelength of the fourth harmonic of the first fundamental wave.
- the transmission wavelength is set to less than 500 nm (reflection wavelength is 500 nm or more), and the first fundamental wave ( ⁇ 1) and the second harmonic (2 ⁇ 1) are reflected and absorbed by the light absorber.
- the laser light having an unnecessary wavelength from entering the wavelength conversion optical element of the second series II (the laser light having the wavelength is emitted from the wavelength conversion unit 3).
- the third wavelength conversion optical element 33 provided in the second series II converts the wavelength of the fourth harmonic wave having the angular frequency 4 ⁇ 1 transmitted through the dichroic mirror 42 into the eighth harmonic wave having the angular frequency 8 ⁇ 1.
- the third wavelength conversion optical element 33 uses a CLBO crystal and adjusts the phase matching condition by non-critical phase matching (NCPM).
- NCPM non-critical phase matching
- the eighth harmonic is generated.
- the eighth harmonic (previous ultraviolet laser beam) having a wavelength of 237.8 nm generated by the third wavelength conversion optical element 33 is incident on the fourth wavelength conversion optical element 34 disposed in contact with the third wavelength conversion optical element 33. To do.
- the second fundamental wave reflected by the dichroic mirror 42 passes through the third wavelength conversion optical element 33 and enters the fourth wavelength conversion optical element 34.
- the fourth wavelength conversion optical element 34 has a wavelength of 194.9 nm from the eighth harmonic of the first fundamental wave generated by the third wavelength conversion optical element 33 and the second fundamental wave transmitted through the third wavelength conversion optical element 33. UV laser light is generated.
- the fourth wavelength conversion optical element 34 uses a CLBO crystal and adjusts the phase matching condition by non-critical phase matching (NCPM).
- NCPM non-critical phase matching
- the fourth wavelength conversion optical element 34 generates a sum frequency of the eighth harmonic of the first fundamental wave having a wavelength of 237.8 nm and the second fundamental wave having a wavelength of 1079 nm, and generates an ultraviolet laser beam having a wavelength of 194.9 nm. Is done.
- the ultraviolet laser beam having a wavelength of 194.9 nm generated by the fourth wavelength conversion optical element 34 is output from the end of the second series II, and the ultraviolet laser beam having a wavelength of 194.9 nm is output from the wavelength conversion optical system 30B of the ultraviolet laser device LS2. Lv is output.
- the phase matching in the first wavelength conversion optical element 31 is quasi phase matching (QPM), and the phases in the third and fourth wavelength conversion optical elements 33 and 34 are set.
- the matching is non-critical phase matching (NCPM), and three of the four wavelength converting optical elements are used in phase matching that does not cause a walk-off. Even in the second wavelength conversion optical element 32 where the walk-off occurs, the angle is very small. Therefore, according to the ultraviolet laser device LS2, in addition to the basic effects already described, wavelength conversion is performed with high efficiency in the wavelength conversion optical system 30B, relatively high output efficiency can be obtained, and beam quality can be improved. An effect that a good ultraviolet laser beam can be obtained can be achieved.
- optical elements such as a mirror and a condensing lens for superimposing the beams are arranged in the infrared to visible region, so that these optical elements are damaged by light in the ultraviolet region. It is possible to extend the life by suppressing the receiving.
- optical elements such as mirrors and condenser lenses are arranged in the ultraviolet region, a shift structure for periodically shifting these optical elements is required. According to this configuration example, such a shift mechanism is provided.
- the third and fourth wavelength conversion optical elements 33 and 34 are arranged in contact with each other, they can be arranged on the same moving stage, thereby shifting the wavelength conversion optical elements 33 and 34 simultaneously. It becomes possible. Thereby, cost can be reduced.
- an ultraviolet laser device LS3 including the wavelength conversion optical system 30C of the third configuration example will be described with reference to FIG.
- two wavelength conversion optical elements 31 and 32 are provided in the first series I on which the first infrared laser light (first fundamental wave) La1 is incident, and the second infrared laser light (first fundamental wave) La1 is provided.
- Two wavelength conversion optical elements 33 and 34 are provided in the second series II into which the laser beam (second fundamental wave) La2 is combined and incident.
- the first wavelength conversion optical element 31 converts the wavelength of the first fundamental wave having the angular frequency ⁇ 1 into the second harmonic having the angular frequency 2 ⁇ 1.
- the first wavelength conversion optical element 31 uses a PPLN crystal similarly to the configuration example described above, and adjusts the phase matching condition by quasi phase matching (QPM).
- the second harmonic wave having a wavelength of 951 nm generated by the first wavelength conversion optical element 31 is incident on the second wavelength conversion optical element 32.
- the second wavelength conversion optical element 32 converts the wavelength of the second harmonic having the angular frequency 2 ⁇ 1 generated by the first wavelength conversion optical element 31 into the fourth harmonic having the angular frequency of 4 ⁇ 1.
- a PPLT crystal is used as the second wavelength conversion optical element 32, and the phase matching condition is adjusted by quasi phase matching (QPM).
- QPM quasi phase matching
- the fourth harmonic wave having a wavelength of 475.5 nm generated by the second wavelength conversion optical element 32 enters the dichroic mirror 42.
- the dichroic mirror 42 is configured to transmit the fourth harmonic of the first fundamental wave having a wavelength of 475.5 nm and reflect the second infrared laser light (second fundamental wave) having a wavelength of 1079 nm.
- the fourth harmonic wave (4 ⁇ 1) of the first fundamental wave is transmitted through the dichroic mirror 42 and focused on the third wavelength conversion optical element 33 provided in the second series II.
- the second fundamental wave reflected by the dichroic mirror 42 is superposed coaxially with the fourth harmonic of the first fundamental wave transmitted through the dichroic mirror 42 and focused on the second wavelength II third wavelength conversion optical element 33.
- the transmission wavelength of the dichroic mirror 42 can be set similarly to the dichroic mirror 42 in the second configuration example. For example, by setting the transmission wavelength to less than 500 nm (reflection wavelength is 500 nm or more), laser light having an unnecessary wavelength is incident on the second-series II wavelength conversion optical element (the laser light having the wavelength is wavelength-converted). (Emitted from the part 3) can be suppressed.
- the third wavelength conversion optical element 33 provided in the second series II converts the wavelength of the fourth harmonic wave having the angular frequency 4 ⁇ 1 transmitted through the dichroic mirror 42 into the eighth harmonic wave having the angular frequency 8 ⁇ 1.
- the third wavelength conversion optical element 33 uses a CLBO crystal and adjusts the phase matching condition by non-critical phase matching (NCPM).
- NCPM non-critical phase matching
- the eighth harmonic is generated.
- the eighth harmonic (previous ultraviolet laser beam) having a wavelength of 237.8 nm generated by the third wavelength conversion optical element 33 is incident on the fourth wavelength conversion optical element 34 disposed in contact with the third wavelength conversion optical element 33. To do.
- the second fundamental wave reflected by the dichroic mirror 42 passes through the third wavelength conversion optical element 33 and enters the fourth wavelength conversion optical element 34.
- the fourth wavelength conversion optical element 34 has a wavelength of 194.9 nm from the eighth harmonic of the first fundamental wave generated by the third wavelength conversion optical element 33 and the second fundamental wave transmitted through the third wavelength conversion optical element 33. UV laser light is generated.
- the fourth wavelength conversion optical element 34 uses a CLBO crystal and adjusts the phase matching condition by non-critical phase matching (NCPM).
- NCPM non-critical phase matching
- the fourth wavelength conversion optical element 34 generates a sum frequency of the eighth harmonic of the first fundamental wave having a wavelength of 237.8 nm and the second fundamental wave having a wavelength of 1079 nm, and generates an ultraviolet laser beam having a wavelength of 194.9 nm. Is done.
- the ultraviolet laser beam having a wavelength of 194.9 nm generated by the fourth wavelength conversion optical element 34 is output from the end of the second series II, and the ultraviolet laser beam having a wavelength of 194.9 nm is output from the wavelength conversion optical system 30C of the ultraviolet laser device LS3. Lv is output.
- the phase matching in the first and second wavelength conversion optical elements 31 and 32 is quasi phase matching (QPM), and the third and fourth wavelength conversion optical elements.
- the phase matching at 33 and 34 is non-critical phase matching (NCPM), and all four wavelength conversion optical elements are used in phase matching that does not cause a walk-off. For this reason, in addition to the basic effects already described, wavelength conversion is performed with extremely high efficiency in the wavelength conversion optical system 30C, high output efficiency can be obtained, and ultraviolet laser light with high beam quality can be obtained. The effect of can be achieved.
- optical elements such as a mirror and a condensing lens for superimposing the beams are arranged in the infrared to visible region, so that these optical elements are damaged by light in the ultraviolet region. It is possible to extend the life by suppressing the receiving.
- optical elements such as mirrors and condenser lenses are arranged in the ultraviolet region, a shift structure for periodically shifting these optical elements is required. According to this configuration example, such a shift mechanism is provided.
- the third and fourth wavelength conversion optical elements 33 and 34 are arranged in contact with each other, they can be arranged on the same moving stage, thereby shifting the wavelength conversion optical elements 33 and 34 simultaneously. It becomes possible. Thereby, cost can be reduced.
- a PPLN crystal is exemplified as the first wavelength conversion optical element 31, but a nonlinear optical crystal such as PPLT, LBO, BBO ( ⁇ -BaB2O4), CBO (CsB3O5) is used. It can also be configured.
- the PPLT and LBO crystals are exemplified as the second wavelength conversion optical element 32, it may be configured using a nonlinear optical crystal such as BBO or CBO.
- the wavelength of the first fundamental wave ⁇ 1 1902 nm output from the first laser beam output unit 1a
- the wavelength ⁇ 2 of the second fundamental wave output from the second laser beam output unit 1b 1079 nm
- the wavelength conversion unit 3 A typical configuration example is shown for the case where the wavelength ⁇ v of the ultraviolet laser light Lv to be set is 194.9 nm, but the wavelength ⁇ 1 of the first fundamental wave, the wavelength ⁇ 2 of the second fundamental wave, and the wavelength ⁇ v of the ultraviolet laser light Lv. How to set is arbitrary.
- the wavelength conversion optical system 30B of the second configuration example shown in FIG. 3 the wavelength ⁇ 1 of the first fundamental wave, the wavelength ⁇ 2 of the second fundamental wave, and the ultraviolet laser beam Lv
- the wavelength of the first fundamental wave ⁇ 1 1921.6 nm
- the wavelength of the second fundamental wave ⁇ 2 1064 nm
- the wavelength ⁇ v of the ultraviolet laser light Lv 196 nm.
- the wavelength conversion unit of the modification will be described as 30B ′.
- the amplified first infrared laser beam La1 is incident on the wavelength conversion optical system 30B ′.
- the amplified second infrared laser light La2 is made incident on the wavelength conversion optical system 30B '.
- the first wavelength conversion optical element 31 converts the wavelength of the first fundamental wave having the angular frequency ⁇ 1 into the second harmonic having the angular frequency 2 ⁇ 1.
- the first wavelength conversion optical element 31 is a PPLN crystal and adjusts the phase matching condition by quasi phase matching (QPM).
- the second harmonic wave having a wavelength of 960.8 nm generated by the first wavelength conversion optical element 31 is incident on the second wavelength conversion optical element 32.
- the second wavelength conversion optical element 32 converts the wavelength of the second harmonic having the angular frequency 2 ⁇ 1 generated by the first wavelength conversion optical element 31 into the fourth harmonic having the angular frequency of 4 ⁇ 1.
- the second wavelength conversion optical element 32 is an LBO crystal and adjusts the phase matching condition by Type I phase matching.
- the fourth harmonic beam emitted from the second wavelength conversion optical element 32 is slightly ellipticalized by the walk-off, but the walk-off angle is as small as about 8 m rad, and the circular beam is formed by two cylindrical lenses. The light is corrected and enters the dichroic mirror 42.
- the dichroic mirror 42 is configured to transmit the fourth harmonic of the first fundamental wave having a wavelength of 480.4 nm and reflect the second fundamental wave having a wavelength of 1064 nm.
- the fourth harmonic wave (4 ⁇ 1) of the first fundamental wave is transmitted through the dichroic mirror 42 and focused on the third wavelength conversion optical element 33 provided in the second series II.
- the setting of the transmission wavelength of the dichroic mirror 42 is as described above, and also in this modified example, by setting the transmission wavelength to less than 500 nm (reflection wavelength of 500 nm or more), It can suppress that the laser beam of an unnecessary wavelength enters into a wavelength conversion optical element.
- the second fundamental wave reflected by the dichroic mirror 42 is superposed coaxially with the fourth harmonic of the first fundamental wave transmitted through the dichroic mirror 42 and focused on the second wavelength II third wavelength conversion optical element 33.
- the third wavelength conversion optical element 33 provided in the second series II converts the wavelength of the fourth harmonic wave having the angular frequency 4 ⁇ 1 transmitted through the dichroic mirror 42 into the eighth harmonic wave having the angular frequency 8 ⁇ 1.
- the third wavelength conversion optical element 33 is a CLBO crystal, and in this modification, the phase matching condition is adjusted by Type I phase matching.
- the eighth harmonic is generated.
- the walk-off angle is about 11 m rad.
- the eighth harmonic wave having a wavelength of 240.2 nm generated by the third wavelength conversion optical element 33 is incident on the fourth wavelength conversion optical element 34 disposed in contact with the third wavelength conversion optical element 33.
- the second fundamental wave reflected by the dichroic mirror 42 passes through the third wavelength conversion optical element 33 and enters the fourth wavelength conversion optical element 34.
- the fourth wavelength conversion optical element 34 is an ultraviolet having a wavelength of 196 nm from the eighth harmonic of the first fundamental wave generated by the third wavelength conversion optical element 33 and the second fundamental wave transmitted through the third wavelength conversion optical element 33. Laser light is generated.
- the fourth wavelength conversion optical element 34 is a CLBO crystal and adjusts the phase matching condition by non-critical phase matching (NCPM).
- NCPM non-critical phase matching
- the fourth wavelength conversion optical element 34 generates a sum frequency of the eighth harmonic of the first fundamental wave having a wavelength of 240.8 nm and the second fundamental wave having a wavelength of 1064 nm, and generates an ultraviolet laser beam having a wavelength of 196 nm. .
- the ultraviolet laser beam having a wavelength of 196 nm generated by the fourth wavelength conversion optical element 34 is output from the end of the second series II, and the ultraviolet laser beam Lv having a wavelength of 196 nm is output from the wavelength conversion optical system 30B ′ of the ultraviolet laser device.
- the ultraviolet laser device of the aspect of the present invention changes the setting of the wavelength ⁇ 1 of the first fundamental wave output from the first laser beam output unit 1a and the wavelength ⁇ 2 of the second fundamental wave output from the second laser beam output unit 1b. Thereby, it can be set as the structure which outputs the ultraviolet laser beam of a suitable wavelength with a wavelength of 200 nm or less.
- the ultraviolet laser device of the present invention is small and light and easy to handle.
- an observation device such as a microscope or a telescope, a measuring device such as a length measuring device or a shape measuring device, an optical device such as an optical modeling device or an exposure device.
- the present invention can be suitably applied to a processing device inspection device, a treatment device, and the like.
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Abstract
Description
第1構成例の波長変換光学系30Aは、第1赤外レーザ光(第1基本波)La1が入射する第1系列Iに3つの波長変換光学素子31~33が設けられ、第2赤外レーザ光(第2基本波)La2が合波されて入射する第2系列IIに波長変換光学素子34が設けられて構成される。
次に、第2構成例の波長変換光学系30Bを備えた紫外レーザ装置LS2について、図3を参照して説明する。第2構成例の波長変換光学系30Bは、第1赤外レーザ光(第1基本波)La1が入射する第1系列Iに2つの波長変換光学素子31,32が設けられ、第2赤外レーザ光(第2基本波)La2が合波されて入射する第2系列IIに2つの波長変換光学素子33,34が設けられて構成される。
次に、第3構成例の波長変換光学系30Cを備えた紫外レーザ装置LS3について、図4を参照して説明する。第3構成例の波長変換光学系30Cは、第1赤外レーザ光(第1基本波)La1が入射する第1系列Iに2つの波長変換光学素子31,32が設けられ、第2赤外レーザ光(第2基本波)La2が合波されて入射する第2系列IIに2つの波長変換光学素子33,34が設けられて構成される。
第1レーザ光出力部1aは、第1レーザ光源11において波長λ1=1921.6nmのシード光Ls1を発生させ、これを第1ファイバ光増幅器(ツリウム・ドープ・ファイバ光増幅器)21により増幅して、増幅された第1赤外レーザ光La1を波長変換光学系30B′に入射させる。同様に、第2レーザ光出力部1bは、第2レーザ光源12により波長λ2=1064nmのシード光Ls2を発生させ、これを第2ファイバ光増幅器(イッテルビウム・ドープ・ファイバ光増幅器)22により増幅して、増幅された第2赤外レーザ光La2を波長変換光学系30B′に入射させる。
日本国出願2011年第066775号(2011年3月24日)
Claims (9)
- 赤外波長のレーザ光を出力するレーザ光出力部と、波長変換光学素子を有し前記レーザ光出力部から出力された赤外レーザ光を紫外波長のレーザ光に波長変換して出力する波長変換部とを備えてなる紫外レーザ装置であって、
前記レーザ光出力部は、波長が1900~2000nmの第1赤外レーザ光を出力する第1レーザ光出力部と、波長が1000~1100nmの第2赤外レーザ光を出力する第2レーザ光出力部とを備え、
前記波長変換部は、前記第1レーザ光出力部から出力された第1赤外レーザ光が入射し伝播する第1系列と、前記第1系列を伝播したレーザ光及び前記第2レーザ光出力部から出力された第2赤外レーザ光が合波されて入射し伝播する第2系列とを備え、
前記波長変換部に入射した前記第1および第2赤外レーザ光が、前記波長変換部に設けられた波長変換光学素子により波長変換されることで、前記第2系列から紫外レーザ光が出力されるように構成した紫外レーザ装置。 - 請求項1に記載の紫外レーザ装置において、
前記波長変換部に設けられた波長変換光学素子は、
前記第1赤外レーザ光の第2高調波を発生する第1波長変換光学素子と、
前記第1波長変換光学素子から出射された前記第2高調波の第2高調波、すなわち前記第1赤外レーザ光の第4高調波を発生する第2波長変換光学素子と、
前記第2波長変換光学素子から出射された前記第4高調波の第2高調波、すなわち前記第1赤外レーザ光の第8高調波である前段紫外レーザ光を発生する第3波長変換光学素子と、
前記前段紫外レーザ光と前記第2赤外レーザ光との和周波発生により前記紫外レーザ光を発生する第4波長変換光学素子と
からなる紫外レーザ装置。 - 請求項2に記載の紫外レーザ装置において、
前記第1波長変換光学素子及び前記第2波長変換光学素子が前記第1系列に設けられ、
前記第3波長変換光学素子及び前記第4波長変換光学素子が前記第2系列に設けられる紫外レーザ装置。 - 請求項2に記載の紫外レーザ装置において、
前記第1波長変換光学素子、前記第2波長変換光学素子及び前記第3波長変換光学素子が前記第1系列に設けられ、
前記第4波長変換光学素子が前記第2系列に設けられる紫外レーザ装置。 - 請求項2~4に記載のいずれか一項に記載の紫外レーザ装置において、
前記第3波長変換光学素子における位相整合及び前記第4波長変換光学素子における位相整合が非臨界位相整合である紫外レーザ装置。 - 請求項2~5のいずれか一項に記載の紫外レーザ装置において、
前記第1波長変換光学素子における位相整合及び前記第2波長変換光学素子における位相整合が疑似位相整合である紫外レーザ装置。 - 請求項1~6のいずれか一項に記載の紫外レーザ装置において、
前記第1レーザ光出力部は、ツリウム・ドープ・ファイバ光増幅器を有して構成される紫外レーザ装置。 - 請求項1~7のいずれか一項に記載の紫外レーザ装置において、
前記第2レーザ光出力部は、イッテルビウム・ドープ・ファイバ光増幅器を有して構成される紫外レーザ装置。 - 請求項1~8のいずれか一項に記載の紫外レーザ装置において、
前記紫外レーザ光は、波長が190~200nmの深紫外光である紫外レーザ装置。
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