WO2013108850A1 - 複数ビーム結合装置 - Google Patents
複数ビーム結合装置 Download PDFInfo
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- WO2013108850A1 WO2013108850A1 PCT/JP2013/050837 JP2013050837W WO2013108850A1 WO 2013108850 A1 WO2013108850 A1 WO 2013108850A1 JP 2013050837 W JP2013050837 W JP 2013050837W WO 2013108850 A1 WO2013108850 A1 WO 2013108850A1
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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
- H01S3/10053—Phase control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/06—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the phase of light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0905—Dividing and/or superposing multiple 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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
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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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/21—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 for the control of the intensity, phase, polarisation or colour by interference
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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
- H01S3/0085—Modulating the output, i.e. the laser beam is modulated 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1307—Stabilisation of the phase
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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
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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
- H01S3/2383—Parallel arrangements
Definitions
- the present invention relates to a multiple beam combining device.
- Patent Document 1 US Pat. No. 7,884,997
- Patent Document 2 Japanese Patent Laid-Open No. 2005-294409 disclose a coherent optical coupling device that combines a plurality of laser beams to obtain a high-intensity laser output. Are listed.
- an “optical heterodyne method” is employed to detect a phase difference between a plurality of laser beams.
- the basic laser beam output from the master oscillator is divided into a reference beam and a plurality of laser beams.
- the frequency of the reference light is shifted by a frequency shifter (optical frequency shifter).
- a beat is generated. Based on the observation of the beat, the phase difference between the plurality of laser beams is obtained.
- the frequency shifter is indispensable as described above. However, this causes the complexity and cost of the device.
- One object of the present invention is to realize a multiple beam combining device capable of controlling the phases of a plurality of laser beams with a simple configuration.
- a multiple beam combining device (1) includes a phase shift unit (50), an overlapping unit (70), an observation unit (80), and a phase control unit (90).
- the phase shift unit (50) shifts the respective phases of the plurality of laser beams (Bb-1, Bb-2, Bb-3) to thereby shift the plurality of shift laser beams (Bc-1, Bc-2, Bc-). 3) is generated.
- the superimposing unit (70) superimposes each of the plurality of shifted laser beams (Bc-1, Bc-2, Bc-3) and the reference beam (Br) to thereby generate a plurality of superimposed laser beams (Bs-1). , Bs-2, Bs-3).
- the observation unit (80) has interference pattern information (PTN1, PTN2, PTN3) regarding a spatial interference pattern that appears when each of the plurality of superimposed laser beams (Bs-1, Bs-2, Bs-3) is observed. Is generated.
- the phase control unit (90) is based on the interference pattern information (PTN1, PTN2, PTN3) obtained for each of the plurality of superimposed laser beams (Bs-1, Bs-2, Bs-3). 50) feedback control of the phase shift according to 50), thereby setting the plurality of shifted laser beams (Bc-1, Bc-2, Bc-3) in a desired state.
- the observation unit (80) is provided with a plurality of observation devices (81-1, 81-2, 81) provided to observe each of the plurality of superimposed laser beams (Bs-1, Bs-2, Bs-3). -3) may be provided. Further, each of the plurality of observation devices (81-1, 81-2, 81-3) (81-i) observes the intensity of one corresponding superposed laser beam (Bs-i) at a plurality of observation positions. A plurality of sensors (82-i1, 82-i2) may be provided. In this case, the interference pattern information (PTN1, PTN2, PTN3) includes intensities (Ai1, Ai2) observed at each of a plurality of observation positions.
- the interference pattern parameter (Ri) is defined based on the intensities (Ai1, Ai2) observed at each of the plurality of observation positions.
- the phase controller (90) causes the interference pattern parameter (Ri) for each of the plurality of superimposed laser beams (Bs-1, Bs-2, Bs-3) to match the target value (Rt).
- the phase shift by the phase shift unit (50) may be feedback controlled.
- the number of the plurality of sensors (82-i1, 82-i2) may be two.
- the two sensors (82-i1, 82-i2) observe the intensity (Ai1, Ai2) at each of the two observation positions.
- the interference pattern parameter (Ri) depends on the intensity ratio, inclination, or difference between the two observation positions.
- the phase control unit (90) feedback-controls the phase shift by the phase shift unit (50) so that the intensities (Ai1, Ai2) at the two observation positions are equal to each other or have predetermined values. May be.
- the multiple beam combining device (1) may further include a beam amplification unit (60) for amplifying each of the plurality of shifted laser beams (Bc-1, Bc-2, Bc-3).
- a beam amplification unit 60 for amplifying each of the plurality of shifted laser beams (Bc-1, Bc-2, Bc-3).
- the multiple beam combining device (1) further includes a laser oscillator (10) for generating a basic laser beam (Ba), and a plurality of laser beams (Bb-1, Bb-2). , Bb-3) and a beam splitting unit (20) that splits the beam into reference light (Br).
- a laser oscillator (10) for generating a basic laser beam (Ba), and a plurality of laser beams (Bb-1, Bb-2). , Bb-3) and a beam splitting unit (20) that splits the beam into reference light (Br).
- the reference light (Br) generated by the beam splitting unit (20) may reach the overlapping unit (70) without passing through the frequency shifter.
- FIG. 1 is a block diagram showing a configuration example of a multiple beam combining device according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing another configuration example of the multiple beam combining device according to the embodiment of the present invention.
- FIG. 3 schematically shows the superposition of the reference beam and the laser beam.
- FIG. 4 schematically shows an interference pattern that appears when superimposing laser light is observed.
- FIG. 5 shows the shift of the interference pattern due to the phase change.
- FIG. 6 shows the intensity distribution of the superimposed laser beam in the X direction.
- FIG. 7 is a block diagram showing a configuration example of the observation unit in the embodiment of the present invention.
- FIG. 8 is a conceptual diagram for explaining phase control in the embodiment of the present invention.
- FIG. 9 shows a configuration example of the observation unit and the phase control unit in the embodiment of the present invention.
- FIG. 10 is a conceptual diagram for explaining phase control in the embodiment of the present invention.
- FIG. 1 is a block diagram showing a configuration example of a multiple beam combining device 1 according to an embodiment of the present invention.
- the multiple beam combining device 1 includes a laser oscillator 10, a beam splitting unit 20, a beam expansion unit 30, a phase shift unit 50, a beam amplification unit 60, a superposition unit 70, an observation unit 80, and a phase control unit 90.
- the laser oscillator 10 functions as a master oscillator, and generates and outputs a basic laser beam Ba.
- the beam splitting unit 20 receives the basic laser beam Ba output from the laser oscillator 10 and splits the basic laser beam Ba into a reference beam Br and a plurality of target laser beams Bb.
- the beam splitter 20 includes beam splitters 21, 22, and 23 and a mirror 24.
- the beam splitter 21 splits the basic laser beam Ba into two laser beams. One of them becomes the reference light Br, and the other enters the beam splitter 22.
- the beam splitter 22 further divides the received laser beam into two laser beams. One of them becomes the target laser beam Bb-1, and the other enters the beam splitter 23.
- the beam splitter 23 further divides the received laser beam into two laser beams.
- the target laser beam Bb-2 is the target laser beam Bb-2, and the other is incident on the mirror 24.
- the laser beam reflected by the mirror 24 becomes the target laser beam Bb-3.
- three target laser beams Bb-1 to Bb-3 are generated, but the number is not limited to three.
- a fiber may be used for beam division.
- the beam expanding unit 30 receives the reference light Br output from the beam splitting unit 20 and expands the beam size of the reference light Br. More specifically, the beam expanding unit 30 includes a mirror 31 and a beam expander 32. The reference light Br is reflected by the mirror 31 and enters the beam expander 32. The beam expander 32 expands the beam size of the reference light Br. The reference beam Br after the beam size expansion is supplied to an overlapping unit 70 (beam splitter 71) described later. The reference beam Br after the beam size expansion is preferably a plane wave.
- the target laser beams Bb-1, Bb-2, and Bb-3 output from the beam splitting unit 20 are reflected by the mirrors 40-1, 40-2, and 40-3, respectively, as an example. Incident on the portion 50.
- the target laser beams Bb-1, Bb-2, and Bb-3 are incident on the phase shift unit 50 through fibers.
- a beam expander, pointing correction, wavefront correction, and the like may be included between the beam splitting unit 20 and the phase shift unit 50.
- the phase shift unit 50 receives a plurality of target laser beams Bb-1 to Bb-3.
- the phase shift unit 50 is configured to shift the phases of the target laser beams Bb-1 to Bb-3.
- the phase shift unit 50 includes phase shifters 51-1 to 51-3.
- each phase shifter 51 for example, a piezo-actuator mirror system is used.
- a transmission type phase shifter is used.
- the phase shifters 51-1, 51-2, and 51-3 receive the target laser beams Bb-1, Bb-2, and Bb-3, respectively, and receive the target laser beams Bb-1, Bb-2, and Bb-3. It is arranged so that the phase can be shifted.
- the amount of phase shift by each of the phase shifters 51-1, 51-2, 51-3 can be controlled by control signals CON1, CON2, CON3.
- the target laser beams Bb-1, Bb-2, and Bb-3 after the phase shift are shifted laser beams Bc-1, Bc-2, and Bc-3, respectively. That is, the phase shift unit 50 generates the shifted laser beams Bc-1, Bc-2, and Bc-3 by performing the phase shift of each of the target laser beams Bb-1, Bb-2, and Bb-3.
- the phase shift by the phase shift unit 50 can be controlled through the control signals CON1 to CON3.
- the control signals CON1 to CON3 are generated by a phase control unit 90 described later.
- the beam amplification unit 60 receives the shifted laser beams Bc-1 to Bc-3 output from the phase shift unit 50, and amplifies each of the shifted laser beams Bc-1 to Bc-3.
- the beam amplification unit 60 includes amplifiers 61-1, 61-2, and 61-3.
- the amplifiers 61-1, 61-2, and 61-3 amplify the shifted laser beams Bc-1, Bc-2, and Bc-3, respectively.
- the amplified shifted laser beams Bc-1, Bc-2, and Bc-3 are supplied to an overlapping unit 70 (beam splitter 71) described later.
- the beam amplification unit 60 may include a beam expander, pointing correction, wavefront correction, and the like.
- the superimposing unit 70 receives the reference light Br output from the beam expanding unit 30, and receives the plurality of shifted laser beams Bc-1, Bc-2, and Bc-3 output from the beam amplifying unit 60.
- the superimposing unit 70 superimposes each of the plurality of shifted laser beams Bc-1, Bc-2, and Bc-3 on the reference beam Br, thereby superimposing the plurality of superimposed laser beams Bs-1, Bs-2. , Bs-3 is generated.
- the overlapping unit 70 includes a beam splitter 71.
- the beam splitter 71 splits each of the shifted laser beams Bc-1, Bc-2, and Bc-3.
- the traveling directions of the divided laser beams Bc-1, Bc-2, Bc-3 and the reference beam Br coincide with each other, and superposed laser beams Bs-1, Bs-2, Bs-3 are generated by superimposing them. Is done.
- a frequency shifter (optical frequency shifter) is not provided on the optical path between the beam splitting unit 20 and the overlapping unit 70.
- the reference light Br generated by the beam splitting unit 20 reaches the overlapping unit 70 without passing through the frequency shifter.
- the target laser beams Bb-1 to Bb-3 and the shifted laser beams Bc-1 to Bc-3 do not pass through the frequency shifter. Therefore, the frequencies of the reference beam Br and the shifted laser beams Bc-1 to Bc-3 are substantially the same.
- a plurality of superimposed laser beams Bs-1 to Bs-3 are input to the observation unit 80.
- beam expanders 75-1, 75-2, and 75-3 may be provided between the overlapping unit 70 and the observation unit 80.
- the beam expanders 75-1, 75-2, and 75-3 expand the respective beam sizes of the superimposed laser beams Bs-1, Bs-2, and Bs-3.
- the superposed laser beams Bs-1 to Bs-3 after the beam size expansion are input to the observation unit 80.
- the observation unit 80 observes each of the superimposed laser beams Bs-1 to Bs-3. It is assumed that the observation plane is parallel to the wavefront of the reference light Br that is a plane wave.
- FIG. 3 conceptually shows the superposition of the reference beam Br and the shifted laser beam Bc.
- the phase of the reference beam Br is uniform, but the phase of the shifted laser beam Bc-i is not necessarily uniform.
- a “spatial interference pattern (interference fringe)” as shown in FIG. appear.
- the repeated direction of interference fringes (the direction in which strength is generated) is hereinafter referred to as “X direction”.
- FIG. 5 shows the shift of the interference pattern due to the phase change.
- the interference pattern on the observation surface is shifted in the X direction accordingly.
- the interference pattern on the observation surface can be shifted in the X direction by controlling the phase shift by the phase shift unit 50 to change the phase of the shifted laser beam Bc-i.
- FIG. 6 shows the intensity distribution of the superimposed laser beam Bs-i in the X direction on the observation surface.
- the horizontal axis represents the position in the X direction
- the vertical axis represents the laser intensity.
- the intensity of the laser intensity repeatedly appears in the X direction due to interference. Specifically, the laser intensity is maximized at the X position where the shifted laser beam Bc-i and the reference beam Br are in phase, and the laser intensity is minimized at the X position where they are in reverse phase. Thus, a spatial intensity distribution corresponding to the interference pattern (interference fringe) is observed.
- the phase of the shifted laser beam Bc-i changes, the intensity distribution on the observation surface is shifted in the X direction accordingly.
- the intensity distribution on the observation surface can be shifted in the X direction by controlling the phase shift by the phase shift unit 50 and changing the phase of the shifted laser beam Bc-i.
- the observation unit 80 generates “interference pattern information PTNi” related to the spatial interference pattern of the superimposed laser beam Bs-i through the observation of the superimposed laser beam Bs-i.
- the interference pattern information PTNi may be anything as long as it reflects the interference pattern, and may be two-dimensional image data as shown in FIG. 4 or FIG. 5, or in the X direction as shown in FIG. It may be intensity distribution data.
- the observation unit 80 outputs the interference pattern information PTN1, PTN2, and PTN3 to the phase control unit 90.
- the phase control unit 90 receives the interference pattern information PTN1 to PTN3. By referring to the interference pattern information PTN1 to PTN3, the phase controller 90 can grasp the phase relationship between the plurality of shifted laser beams Bc-1 to Bc-3. Therefore, the phase control unit 90 can perform feedback control of each of the phase shifters 51-1 to 51-3 of the phase shift unit 50 so as to obtain a desired phase relationship. Specifically, the phase controller 90 generates the control signals CON1, CON2, CON3 so that each of the shifted laser beams Bc-1, Bc-2, Bc-3 is in a desired state, and these control signals CON1 , CON2 and CON3 are output to the phase shifters 51-1, 51-2 and 51-3, respectively.
- the phase control unit 90 performs the phase shift by the phase shift unit 50 based on the interference pattern information PTN1, PTN2, and PTN3 obtained for each of the superimposed laser beams Bs-1, Bs-2, and Bs-3.
- the plurality of shifted laser beams Bc-1, Bc-2, and Bc-3 are set in a desired state.
- the phase controller 90 matches the phases of the shifted laser beams Bc-1 to Bc-3 with each other by performing pattern matching based on the interference pattern information PTN1 to PTN3.
- a high-intensity laser output can be obtained.
- the observation unit 80 includes observation devices 81-1, 81-2, and 81-3.
- the observation devices 81-1, 81-2, and 81-3 are separately provided so as to observe each of the superimposed laser beams Bs-1, Bs-2, and Bs-3.
- the observation devices 81-1, 81-2, and 81-3 generate interference pattern information PTN1, PTN2, and PTN3, respectively.
- Each observation device 81-i 1, 2, 3) observes the intensity of the corresponding one superimposed laser beam Bs-i at a plurality of observation positions.
- a photodiode is used as the sensor 82.
- the plurality of sensors 82-ij are arranged at different X positions, and are aligned along the X direction. By using such a plurality of sensors 82-ij, the observation device 81-i can measure the intensity of the superimposed laser beam Bs-i at different X positions.
- FIG. 8 conceptually shows the measurement of the intensity of the superimposed laser beam Bs-i by the plurality of sensors 82-ij. Similar to FIG. 6, the horizontal axis represents the position in the X direction, and the vertical axis represents the laser intensity. As shown in FIG. 8, the sensor 82-ij measures the intensity Aij of the superimposed laser beam Bs-i at the position Xij. That is, the intensity Ai1 to Ain at each of the plurality of positions Xi1 to Xin is obtained as information regarding the superimposed laser beam Bs-i.
- the intensities Ai1 to Ain at each of the plurality of positions Xi1 to Xin reflect the spatial interference pattern (intensity distribution) of the superimposed laser beam Bs-i. Accordingly, the intensities Ai1 to Ain observed at each of the plurality of positions Xi1 to Xin are used as the interference pattern information PTNi regarding the superimposed laser beam Bs-i.
- interference pattern parameter Ri is introduced.
- Ri f (Xij, Aij)
- interference pattern parameter Ri also reflects the spatial interference pattern (intensity distribution) of the superimposed laser beam Bs-i.
- the interference pattern parameter Ri also changes accordingly.
- the interference pattern parameter Ri can be changed by changing the phase of the shifted laser beam Bc-i by controlling the phase shift by the phase shift unit 50 described above.
- the phase controller 90 can obtain interference pattern parameters R1, R2, and R3 related to the superimposed laser beams Bs-1, Bs-2, and Bs-3 from the interference pattern information PTN1, PTN2, and PTN3.
- the phase control unit 90 can grasp the phase relationship between the plurality of shifted laser beams Bc-1, Bc-2, and Bc-3. Therefore, the phase control unit 90 can perform feedback control of each of the phase shifters 51-1 to 51-3 of the phase shift unit 50 so as to obtain a desired phase relationship.
- the phase control unit 90 performs feedback control so that the phases of the shifted laser beams Bc-1 to Bc-3 coincide with each other. Specifically, certain target values Rt1, Rt2, and Rt3 are set. Then, the phase control unit 90 feedback-controls the phase shift by the phase shift unit 50 so that the interference pattern parameters R1, R2, and R3 coincide with the target values Rt1, Rt2, and Rt3. In other words, the phase control unit 90 locks the phase of the shifted laser beam Bc-i at a desired position by controlling the interference pattern parameter Ri to the target value Rti.
- the target values Rt1, Rt2, and Rt3 may be set in advance in a circuit such as a register.
- the target values Rt1, Rt2, and Rt3 may be set by an external signal.
- the target values Rt1, Rt2, and Rt3 may be common values.
- the target values Rt1, Rt2, and Rt3 may be selectable from a plurality of values.
- the target values Rt1, Rt2, and Rt3 may be continuously variable.
- the sensor 82-ij may be designed to be movable in the X direction. By physically moving the X position of the sensor 82-ij, the value (lock value) at which the phase of the shifted laser beam Bc-i is locked can be changed.
- the lock value may be changed by performing signal processing on the interference pattern information and outputting it.
- the output voltage of the sensor 82 can be changed by adjusting the internal resistance, the bias voltage, and the like of the sensor 82, whereby the lock value can be changed.
- FIG. 9 shows an example of the configuration of the observation unit 80 and the phase control unit 90.
- Each observation device 81-i includes only two sensors 82-i1 and 82-i2, and measures the intensity Ai1 and Ai2 at two points with respect to the superimposed laser beam Bs-i. That is, the interference pattern information PTNi is the strengths Ai1 and Ai2. Since the number of sensors 82 is minimal, the configuration is simple and suitable.
- the phase control unit 90 includes a differential amplifier 91-i connected to the observation device 81-i.
- the predetermined target value Rti is set to “0”. This is equivalent to performing feedback control so that the intensities Ai1 and Ai2 at two points coincide as shown in FIG. That is, the differential amplifier 91-i feedback-controls the control signal CONi (phase shifter 51-i) so that the intensities Ai1 and Ai2 are equal. Control as shown in FIG. 10 is simple and suitable.
- the intermediate point between the positions Xi1 and Xi2 can be placed at the intermediate point between the maximum and minimum of the intensity distribution.
- the interval between the positions Xi1 and Xi2 is set to half of the intensity pattern change period.
- phase control is performed based on the “spatial interference pattern”. Since it is not a conventional optical heterodyne system, a frequency shifter is unnecessary. That is, it is possible to realize phase control with a simpler configuration than in the past. This also leads to cost reduction.
- a high-intensity laser output by combining a plurality of amplified amplified laser beams Bc-1, Bc-2, and Bc-3.
- coherent coupling it is conceivable to perform control so that the phase difference between the shifted laser beams Bc-1, Bc-2, and Bc-3 at the output stage is zero.
- This embodiment can be applied to a coherent optical coupling device and a high-power laser system.
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Abstract
Description
Claims (8)
- 複数のレーザ光のそれぞれの位相をシフトさせることによって複数のシフトレーザ光を生成する位相シフト部と、
前記複数のシフトレーザ光のそれぞれと参照光とを重ね合わせることによって複数の重ね合わせレーザ光を生成する重ね合わせ部と、
前記複数の重ね合わせレーザ光の各々を観測した際に現れる空間的な干渉パターンに関する干渉パターン情報を生成する観測部と、
前記複数の重ね合わせレーザ光毎に得られた前記干渉パターン情報に基づいて、前記位相シフト部による位相シフトをフィードバック制御し、それにより、前記複数のシフトレーザ光を所望の状態に設定する位相制御部と
を備える
複数ビーム結合装置。 - 請求項1に記載の複数ビーム結合装置であって、
前記観測部は、前記複数の重ね合わせレーザ光のそれぞれを観測するように設けられた複数の観測装置を備え、
前記複数の観測装置の各々は、対応する1つの重ね合わせレーザ光の強度を複数の観測位置において観測する複数のセンサを備え、
前記干渉パターン情報は、前記複数の観測位置のそれぞれにおいて観測された前記強度を含む
複数ビーム結合装置。 - 請求項2に記載の複数ビーム結合装置であって、
干渉パターンパラメータは、前記複数の観測位置のそれぞれにおいて観測された前記強度に基づいて定義され、
前記位相制御部は、前記複数の重ね合わせレーザ光のそれぞれに関する前記干渉パターンパラメータが目標値に一致するように、前記位相シフト部による前記位相シフトをフィードバック制御する
複数ビーム結合装置。 - 請求項3に記載の複数ビーム結合装置であって、
前記複数のセンサの数は2個であり、
前記2個のセンサは、2箇所の観測位置のそれぞれにおける前記強度を観測し、
前記干渉パターンパラメータは、前記2箇所の観測位置の間の前記強度の比、あるいは傾き、あるいは差に依存する
複数ビーム結合装置。 - 請求項4に記載の複数ビーム結合装置であって、
前記位相制御部は、前記2箇所の観測位置のそれぞれにおける前記強度が等しくなるように、あるいは、所定の値となるように、前記位相シフト部による前記位相シフトをフィードバック制御する
複数ビーム結合装置。 - 請求項1乃至5のいずれか一項に記載の複数ビーム結合装置であって、
更に、
前記複数のシフトレーザ光のそれぞれを増幅するビーム増幅部
を備える
複数ビーム結合装置。 - 請求項1乃至6のいずれか一項に記載の複数ビーム結合装置であって、
更に、
基本レーザ光を生成するレーザ発振器と、
前記基本レーザ光を、前記複数のレーザ光と前記参照光とに分割するビーム分割部と
を備える
複数ビーム結合装置。 - 請求項7に記載の複数ビーム結合装置であって、
前記ビーム分割部によって生成された前記参照光は、周波数シフタを通ることなく、前記重ね合わせ部に到達する
複数ビーム結合装置。
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US14/368,559 US9325149B2 (en) | 2012-01-20 | 2013-01-17 | Multi-beam combining apparatus |
RU2014128306/28A RU2581513C2 (ru) | 2012-01-20 | 2013-01-17 | Устройство для совмещения нескольких лучей |
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