CN105738960B - Midsequent femtosecond pulse high precision displacement detection device - Google Patents
Midsequent femtosecond pulse high precision displacement detection device Download PDFInfo
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- CN105738960B CN105738960B CN201610084874.9A CN201610084874A CN105738960B CN 105738960 B CN105738960 B CN 105738960B CN 201610084874 A CN201610084874 A CN 201610084874A CN 105738960 B CN105738960 B CN 105738960B
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V7/00—Measuring gravitational fields or waves; Gravimetric prospecting or detecting
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
Midsequent femtosecond pulse high precision displacement detection device belongs to gravitational wave detection field, which includes：Measurement end, No.1 femtosecond lock phase repeater, No. two femtosecond lock phase repeaters and No. three femtosecond lock phase repeaters；Present invention employs pulse temporal locking-types to relay measurement structure, the cascade that phase repeater is locked by three femtoseconds is amplified the luminous power for measuring light, system light echo power is become by the biquadratic attenuation function for being tested distance for a square attenuation function, realizes the overlength distance dynamic displacement detection of outer solar system scale；The displacement that Subnano-class sensitivity is realized by optical delay line scanning detects；It is relatively independent between measurement end and three femtosecond lock phase repeaters, avoid intersatellite real-time Communication for Power remote away and high precision clock stationary problem.
Description
Technical field
The invention belongs to gravitational wave detection fields, relate generally to a kind of outer solar system scale overlength distance high-precision femtosecond and swash
Light pulse displacement detecting apparatus.
Background technology
For many years, gravitational wave detection is always the research hotspot of countries in the world, and the detection of gravitational wave is opposite to broad sense
Direct verification by prophesy and the Direct Test to its core concept, and to the quantization for inquiring into gravitational field and big unification
Model, research universe origin and evolution are of great significance.The detection of gravitational wave directly facilitates the birth of gravitational astronomy,
Traditional electromagnetic wave means to be replaced to observe universe with gravitational wave, this can be provided for us in the past can not largely
The information of acquisition further deepens to provide new approach to the understanding in universe for people.
Remote accurate displacement detection is the core technology of gravitational wave detection, and current detection method is based on laser interference more
Instrument.The ground gravitational waves such as the LIGO in the U.S., the GEO600 of Germany, the VIRGO of Italy and the TAMA300 of Japan, are surveyed
Tens kilometers of Cheng Keda；The spatial attractions wave detectors such as the LISA in the U.S., the NGO in Europe, ranging is up to millions of kilometers；China
More than one hundred million kilometers are up to deep spaces gravitational wave ranging such as the ASTROD of European collaborative, and the ranging of its follow-up work is more
Far, accurate displacement detection will be unfolded on outer solar system scale.
However, in above-mentioned deep space gravitational wave detection task, since ranging is remote, with current beam shaping technology, i.e.,
The beam divergence angle for making emergent light is only several microradians, and when reaching remote destination end, hot spot will also spread extremely bright
It is aobvious；Along with optical loss inevitable in light path, the light echo power of range-measurement system is acute in biquadratic relationship with tested distance
Strong attenuation, the light echo energy that system finally detects are only small part in emanated energy.For example, spatial attraction wave detects
System light echo energy in project LISA is only be emitted light energy 1/1010, the system light echo energy in ASTROD is only to be emitted
The 3/10 of light energy14.The too small signal-to-noise ratio that will lead to range-measurement system of light echo power is greatly lowered, and then measurement accuracy can not
It meet demand or even can not measure at all.
In long distance laser ranging field, such as 2002, the Journal of Geodynamics third phases of volume 34 delivered
Article《Asynchronous laser transponders for precise interplanetary ranging and
time transfer》；For another example 2010, photoelectric project the 5th phase of volume 37 published an article《Asynchronous response laser ranging technique》,
The pulse power of range-measurement system is amplified using asynchronous transponder at tested end so that system light echo power is by by ranging
From biquadratic attenuation function become for a square attenuation function, significantly extend system ranging.But this method is amplified
There are time domain delay and the nonsynchronous problems of clock compared with former pulse train for pulse train, it is impossible in the same of amplification pulse power
When retain the time-domain information of former pulse signal, can only be compensated by other means, range accuracy is caused to be difficult to break through millimeter
Magnitude.And this method needs realizing high precision clock synchronization and real-time Communication for Power between two remote measurement ends.
In gravitational wave detection field, such as 2003, Physical Review D the 12nd phases of volume 67 published an article
《Implementation of time-delay interferometry for LISA》；For another example 2012, Journal of
Geodesy the 12nd phases of volume 86 publish an article《Intersatellite laser ranging instrument for the
GRACE follow-on mission》, two-way laser interference displacement detection method is proposed, is swashed by the subordinate at tested end
The main laser at light device conjunction measuring end measures, and ranging can reach five gigameters.But two-way interferometer is still
The ranging demand of more than one hundred million kilometers of the deep spaces such as ASTROD gravitational wave detection task can not be met, and this method is needed apart from remote two
Realize that real-time Communication for Power is synchronous with high precision clock between a measurement end, this is difficult to realize on more than one hundred million kilometers of distance scale
's.
In recent years, with the development of femtosecond laser technology, femtosecond pulse distance measuring method has progressed into the visual field of people.Its
Main advantage is that pulse energy is concentrated very much, and high peak power can be reached in moment.Compared to interferometry and double
To the continuous waves measuring method such as interferometry, under identical laser average power, system light echo power can improve multiple
Even more than ten magnitudes, thus measured more suitable for overlength distance.In addition, based on the distance measuring method of femtosecond laser compared to tradition
For pulse ranging method, higher precision can be reached.
In femtosecond laser ranging field, such as 2010, Nature Photonics the 10th phases of volume 4 published an article《Time-
of-flight measurement with femtosecond light pulses》；For another example 2012, Acta Physica Sinica the 61st
It rolled up for the 24th phase to publish an article《Arbitrarily long absolute distance measurement based on femtosecond laser balance optical cross-correlation》, propose a kind of needle
To the balance optical cross-correlation method of femtosecond pulse, locked by measuring the time domain between pulse and reference pulse, realize and receive
The range accuracy of rice magnitude.But in overlength distance measurement, this method is still insufficient for the survey of deep space gravitational wave detection task
Journey demand, and with the increase of tested distance, measurement error linearly increases, and can not meet the essence of spatial attraction wave detection mission
Degree demand.In addition, in overlength distance measurement, since the two-way time for measuring light is very long, measuring system greatly affected
Dynamic characteristic so that this method can only measure static object, can not complete dynamic and measure.
In conclusion lacking a kind of outer solar system scale based on femtosecond laser in gravitational wave detection field at present surpasses long distance
From high precision displacement detection device.
Invention content
The present invention for above device precision is relatively low, ranging needs to be further improved, dynamic object cannot be measured and away from
From the problems such as real-time Communication for Power is synchronous with high precision clock is difficult to realize between remote measurement end, proposes and devise a kind of relaying
Formula femtosecond pulse high precision displacement detection device.Pulse temporal locking-type relaying measurement structure is employed, realizes outer solar system
The overlength distance dynamic displacement detection of scale, detectivity can reach sub-nanometer magnitude, while avoid remote away
Intersatellite real-time Communication for Power and high precision clock stationary problem.
The purpose of the present invention is achieved through the following technical solutions：
A kind of midsequent femtosecond pulse high precision displacement detection device includes measurement end, No.1 femtosecond lock phase repeater, two
Number femtosecond lock phase repeater and No. three femtoseconds lock phase repeaters, constitute pulse temporal locking-type relaying measurement structure；The survey
The output light for measuring end is directed toward the input terminal of No.1 femtosecond lock phase repeater, and the output light of No.1 femtosecond lock phase repeater is directed toward No. two
Femtosecond locks the input terminal of phase repeater, and the output light of No. two femtosecond lock phase repeaters is directed toward the input of No. three femtosecond lock phase repeaters
End, the output light of No. three femtosecond lock phase repeaters are directed toward measurement end.
The structure of the measurement end is：The laser that local femto-second laser is sent out passes through No.1 quarter-wave plate and No.1
It is divided into two beams after polarization spectroscope；Wherein through Beam directive after No. two quarter-wave plates and No.1 beam-expanding collimation device
No.1 femtosecond locks phase repeater；Another beam reflected light directive one after ten No. three quarter-wave plates and right-angle prism speculum
Number corner cube reflector, after being reflected again by right-angle prism speculum, No. two corner cube reflectors, ten No. three quarter-wave plates,
No.1 polarization spectroscope, half wave plate and No. two polarization spectroscope directives locally balance photoelectric detection unit；Meanwhile from three
The laser that number femtosecond lock phase repeater launches is by No. two beam-expanding collimation devices, ten No. two quarter-wave plates and No. two polarizations
Also directive locally balances photoelectric detection unit after spectroscope；No.1 corner cube reflector is fixed in precision displacement table, accurate displacement
Platform is located on precise linear guide；The output terminal of local balance photoelectric detection unit is connected to the input terminal of local control unit,
The output terminal of local control unit is connected to precision displacement table.
The structure of No.1 femtosecond lock phase repeater is：The laser that No.1 femto-second laser is sent out by No. four four/
It is divided into two beams after one wave plate and No. three polarization spectroscopes；Wherein through Beam is expanded by No. five quarter-wave plates and No. four
No. two femtosecond lock phase repeaters of directive, another beam reflected light are emitted directly toward No.1 balance photoelectric detection unit after collimator；Meanwhile
The laser launched from measurement end is inclined by No. three beam-expanding collimation devices, No. three quarter-wave plates, No.1 speculum and No. three
It shakes after spectroscope also directive No.1 balance photoelectric detection unit；The output terminal of No.1 balance photoelectric detection unit is connected to No.1 control
The input terminal of unit processed, the output terminal of No.1 control unit are connected to No.1 femto-second laser.
The structure of No. two femtoseconds lock phase repeater is：The laser that No. two femto-second lasers are sent out by No. seven four/
It is divided into two beams after one wave plate and No. five polarization spectroscopes；Wherein through Beam is expanded by No. eight quarter-wave plates and No. six
No. three femtosecond lock phase repeaters of directive after collimator, another beam reflected light No. two balance light of directive after No. four polarization spectroscopes
Electric probe unit；Meanwhile from the No.1 femtosecond laser that launches of lock phase repeater by No. five beam-expanding collimation devices, No. six four points
One of also No. two balance photoelectric detection units of directive after wave plate and No. four polarization spectroscopes；No. two balance the defeated of photoelectric detection unit
Outlet is connected to the input terminal of No. two control units, and the output terminal of No. two control units is connected to No. two femto-second lasers.
The structure of No. three femtoseconds lock phase repeater is：The laser that No. three femto-second lasers are sent out by No. ten four/
It is divided into two beams after one wave plate and No. six polarization spectroscopes；Wherein through Beam is by ride on Bus No. 11 quarter-wave plate and No. eight expansions
Directive measurement end after beam collimator, another beam reflected light are emitted directly toward No. three balance photoelectric detection units；Meanwhile from No. two femtoseconds
The laser that lock phase repeater launches is by No. seven beam-expanding collimation devices, No. nine quarter-wave plates, No. two speculums and No. six
Also directive three balances photoelectric detection units after polarization spectroscope；The output terminal of No. three balance photoelectric detection units is connected to No. three
The input terminal of control unit, the output terminal of No. three control units are connected to No. three femto-second lasers.
The invention has the characteristics that and advantageous effect：
(1) pulse temporal locking-type relaying measurement structure is employed, locks the cascade of phase repeater to surveying by multiple femtoseconds
The luminous power of amount light is amplified, and system light echo power is become by the biquadratic attenuation function of distance for a square attenuation function,
Feedback control is carried out to reference signal light path by optical delay line scanning, realizes the overlength distance dynamic bit of outer solar system scale
Detection is moved, detectivity can reach sub-nanometer magnitude.
(2) it is relatively independent between measurement end and three femtosecond lock phase repeaters, avoid intersatellite reality remote away
Shi Tongxin and high precision clock stationary problem.
Description of the drawings
Fig. 1 is the General allocation structure schematic diagram of the present invention.
Fig. 2 is the device of the invention structure diagram.
Piece number explanation in figure：1 measurement end, 2 No.1 femtoseconds lock phase repeater, 3 No. two femtoseconds lock phase repeaters, 4 No. three fly
Second lock phase repeater, 5 precise linear guides, 6 precision displacement tables, 7 No. two corner cube reflectors, 8 right-angle prism speculums, 90 three
Number quarter-wave plate, 10 No.1 polarization spectroscopes, 11 No. two quarter-wave plates, 12 No. three beam-expanding collimation devices, 13 No. three four
/ mono- wave plate, 14 No.1 femto-second lasers, 15 No.1 control units, 16 No. four quarter-wave plates, 17 No. three polarization spectros
Mirror, 18 No.1s balance photoelectric detection unit, 19 No. five quarter-wave plates, 20 No. four beam-expanding collimation devices, 21 No. five beam-expanding collimations
Device, 22 No. six quarter-wave plates, 23 No. four polarization spectroscopes, 24 No. two balance photoelectric detection units, 25 No. two control units,
26 No. two femto-second lasers, 27 No. seven quarter-wave plates, 28 No. five polarization spectroscopes, 29 No. eight quarter-wave plates, 30 6
Number beam-expanding collimation device, 31 No. seven beam-expanding collimation devices, 32 No. nine quarter-wave plates, 33 No. three femto-second lasers, 34 No. three controls
Unit, 35 No. ten quarter-wave plates, 36 No. six polarization spectroscopes, 37 No. three balance photoelectric detection units, 38 ride on Bus No. 11s four are divided
One of wave plate, 39 No. eight beam-expanding collimation devices, 40 No. two beam-expanding collimation devices, 410 No. two quarter-wave plates, 42 No. two polarization point
Light microscopic, 43 local balance photoelectric detection units, 44 local control units, 45 No.1 corner cube reflectors, 46 local femto-second lasers,
47 No.1 quarter-wave plates, 48 half wave plates, 49 No.1 beam-expanding collimation devices, 50 No. two speculums, 52 No.1 speculums.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
The midsequent femtosecond pulse high precision displacement detection device of the present embodiment, Fig. 1 are its General allocation structure schematic diagram,
Fig. 2 is its apparatus structure schematic diagram, which includes measurement end 1,2, No. two femtosecond locks of No.1 femtosecond lock phase repeater mutually relay
Device 3 and No. three femtosecond lock phase repeaters 4, constitute pulse temporal locking-type relaying measurement structure；The output light of the measurement end 1
The input terminal of No.1 femtosecond lock phase repeater 2 is directed toward, the output light of No.1 femtosecond lock phase repeater 2 is directed toward in No. two femtosecond lock phases
After the input terminal of device 3, the output light of No. two femtoseconds lock phase repeaters 3 is directed toward the input terminal of No. three femtoseconds lock phase repeaters 4, No. three
The output light of femtosecond lock phase repeater 4 is directed toward measurement end 1.
In the measurement end 1：The linearly polarized light that local femto-second laser 46 is sent out passes through No.1 quarter-wave plate 47
After become circularly polarized light, wavelength X 1550nm；Pulse recurrence frequency f is 100MHz；Pulse period T is 10-8s；Pulse width
W is 10fs.The light beam is divided into two beams after No.1 polarization spectroscope 10；The P light being transmitted is denoted as S as measuring signal Ama,
Become circularly polarized light, and the directive one after the beam-expanding collimation of No.1 beam-expanding collimation device 49 after No. two quarter-wave plates 11
Number femtosecond lock phase repeater 2；The S light reflected is denoted as S as local reference signalr, by ten No. three quarter-wave plates 9
After become circularly polarized light, and No.1 corner cube reflector 45 is reflexed to through right-angle prism speculum 8, again by straight after being reflected again
Become P light after 8, No. two corner cube reflectors 7 of angle prism speculum and ten No. three quarter-wave plates 9, and pass through No.1 polarization point
Become S light after light microscopic 10 and half wave plate 48, finally by the locally balance photodetection of No. two 42 directives of polarization spectroscope
Unit 43；Meanwhile the circularly polarized light launched from No. three femtoseconds lock phase repeaters 4 is denoted as S as heliogramb, by two
Become P light, and the also directive after No. two polarization spectroscopes 42 after number beam-expanding collimation device 40 and ten No. two quarter-wave plates 41
Local balance photoelectric detection unit 43；No.1 corner cube reflector 45 is fixed in precision displacement table 49, and precision displacement table 49 is located at
On precise linear guide 5；The feedback signal that local balance photoelectric detection unit 43 generates is exported to local control unit 44, local
The control signal that control unit 44 generates is exported to precision displacement table 6, by controlling its displacement, in a manner that optical delay line scans
Feedback control is carried out to the light path of heliogram so that SrAnd Sb, that is, SmaAnd SbPulse precise overlay and mutual in the time domain
Lock.
In No.1 femtosecond lock phase repeater 2：The linearly polarized light that No.1 femto-second laser 14 is sent out passes through No. four four
Become circularly polarized light, wavelength X after/mono- wave plate 161For 1550nm；Pulse recurrence frequency f1About 100MHz；Pulse period T1
About 10-8s；Pulse width w1For 10fs.The light beam is divided into two beams after No. three polarization spectroscopes 17；The P light conducts being transmitted
Measuring signal B, is denoted as Smb, become circularly polarized light after No. five quarter-wave plates 19, and pass through No. four beam-expanding collimation devices 20
Beam-expanding collimation after No. two femtoseconds of directive lock phase repeaters 3；The S light reflected is used as with reference to signal A, is denoted as Sra, it is emitted directly toward
No.1 balances photoelectric detection unit 18；Meanwhile the circularly polarized light S launched from measurement end 1maBy No. three beam-expanding collimation devices 12
With become P light, and also directive one after No.1 speculum 51 and No. three polarization spectroscopes 17 after No. three quarter-wave plates 13
Number balance photoelectric detection unit 18；The feedback signal that No.1 balance photoelectric detection unit 18 generates is exported to No.1 control unit
15, the control signal that No.1 control unit 15 generates is exported to No.1 femto-second laser 14, to its pulse recurrence frequency f1It carries out
Feedback control so that SmaAnd Sra, that is, SmaAnd SmbPulse precise overlay and interlock in the time domain.
In No. two femtoseconds lock phase repeater 3：The linearly polarized light that No. two femto-second lasers 26 are sent out passes through No. seven four
Become circularly polarized light, wavelength X after/mono- wave plate 272For 1550nm；Pulse recurrence frequency f2About 100MHz；Pulse period T2
About 10-8s；Pulse width w2For 10fs.The light beam is divided into two beams after No. five polarization spectroscopes 28；The P light conducts being transmitted
Measuring signal C, is denoted as Smc, become circularly polarized light after No. eight quarter-wave plates 29, and pass through No. six beam-expanding collimation devices 30
Beam-expanding collimation after No. three femtoseconds of directive lock phase repeaters 4；The S light reflected is used as with reference to signal B, is denoted as Srb, by No. four
No. two balance photoelectric detection units 24 of directive after polarization spectroscope 23；Meanwhile launched from No.1 femtosecond lock phase repeater 2
Circularly polarized light SmbBecome P light after No. five beam-expanding collimation devices 21 and No. six quarter-wave plates 22, and pass through No. four polarizations point
Also directive two balances photoelectric detection units 24 after light microscopic 23；The feedback signal output that No. two balance photoelectric detection units 24 generate
To No. two control units 25, the control signal that No. two control units 25 generate is exported to No. two femto-second lasers 26, to its pulse
Repetition rate f2Carry out feedback control so that SmbAnd Srb, that is, SmbAnd SmcPulse precise overlay and interlock in the time domain.
In No. three femtoseconds lock phase repeater 4：The linearly polarized light that No. three femto-second lasers 33 are sent out passes through No. ten four
Become circularly polarized light, wavelength X after/mono- wave plate 353For 1550nm；Pulse recurrence frequency f3About 100MHz；Pulse period T3
About 10-8s；Pulse width w3For 10fs.The light beam is divided into two beams after No. six polarization spectroscopes 36；The P light conducts being transmitted
Heliogram is denoted as Sb, become circularly polarized light after ride on Bus No. 11 quarter-wave plate 38, and pass through No. eight beam-expanding collimation devices 39
Beam-expanding collimation after directive measurement end 1；The S light reflected is used as with reference to signal C, is denoted as Src, it is emitted directly toward No. three balance photoelectricity
Probe unit 37；Meanwhile the circularly polarized light S launched from No. two femtosecond lock phase repeaters 3mcBy No. seven beam-expanding collimation devices 31
With become P light, and also directive three after No. two speculums 50 and No. six polarization spectroscopes 36 after No. nine quarter-wave plates 32
Number balance photoelectric detection unit 37；The feedback signal that No. three balance photoelectric detection units 37 generate is exported to No. three control units
34, the control signal that No. three control units 34 generate is exported to No. three femto-second lasers 33, to its pulse recurrence frequency f3It carries out
Feedback control so that SmcAnd Src, that is, SmcAnd SbPulse precise overlay and interlock in the time domain.
Work as SbAnd SrAfter having locked, if generating relative displacement Δ D between measurement end 1 and No. two femtosecond lock phase repeaters 3,
It will lead to S in measurement end 1bAnd SrDeviation is generated in the time domain；Local control unit 44 generates the control signal of approximate DC, control
Precision displacement table 6 processed changes reference signal light path, until SbAnd SrPulse train relock, then precision displacement table 6 generate
Displacement is tested displacement：
Wherein, feedback voltage U=2.05mV, c are the light velocity in vacuum, and feedback signal sensitivity k is 3mV/fs, then detects
Displacement D for 102.5nm, Allan variance is in sub-nanometer level.
Claims (1)
1. a kind of midsequent femtosecond pulse high precision displacement detection device, it is characterised in that：Include measurement end (1), No.1 femtosecond
Phase repeater (2), No. two femtosecond lock phase repeaters (3) and No. three femtosecond lock phase repeaters (4) are locked, constitute pulse temporal locking
Formula relays measurement structure；The output light of the measurement end (1) is directed toward the input terminal of No.1 femtosecond lock phase repeater (2), and No.1 flies
The output light of second lock phase repeater (2) is directed toward the input terminal of No. two femtoseconds lock phase repeaters (3), and No. two femtoseconds lock phase repeaters
(3) output light is directed toward the input terminal of No. three femtosecond lock phase repeaters (4), and the output light of No. three femtosecond lock phase repeaters (4) refers to
To measurement end (1)；
The structure of the measurement end (1) is：The laser that local femto-second laser (46) sends out passes through No.1 quarter-wave plate
(47) and after No.1 polarization spectroscope (10) it is divided into two beams；Wherein through Beam passes through No. two quarter-wave plates (11) and one
Number beam-expanding collimation device (49) directive No.1 femtosecond lock phase repeater (2) afterwards；Another beam reflected light passes through ten No. three quarter-waves
Piece (9) and right-angle prism speculum (8) directive No.1 corner cube reflector (45) afterwards, again by right-angle prism speculum after being reflected
(8), No. two corner cube reflectors (7), ten No. three quarter-wave plates (9), No.1 polarization spectroscope (10), half wave plate
(48) and No. two polarization spectroscope (42) directives locally balance photoelectric detection unit (43)；Meanwhile it is mutually relayed from No. three femtosecond locks
The laser that device (4) launches is by No. two beam-expanding collimation devices (40), ten No. two quarter-wave plates (41) and No. two polarizations point
Also directive locally balances photoelectric detection unit (43) after light microscopic (42)；No.1 corner cube reflector (45) is fixed on precision displacement table
(49) on, precision displacement table (49) is on precise linear guide (5)；The output terminal of local balance photoelectric detection unit (43) connects
The input terminal of local control unit (44) is connected to, the output terminal of local control unit (44) is connected to precision displacement table (6)；
The structure of No.1 femtosecond lock phase repeater (2) is：The laser that No.1 femto-second laser (14) is sent out passes through No. four four
It is divided into two beams after/mono- wave plate (16) and No. three polarization spectroscopes (17)；Wherein through Beam passes through No. five quarter-waves
No. two femtosecond lock phase repeaters (3) of directive, another beam reflected light are emitted directly toward one afterwards for piece (19) and No. four beam-expanding collimation devices (20)
Number balance photoelectric detection unit (18)；Meanwhile the laser launched from measurement end (1) by No. three beam-expanding collimation devices (12),
Also directive No.1 balance photoelectricity is visited after No. three quarter-wave plates (13), No.1 speculum (51) and No. three polarization spectroscopes (17)
Survey unit (18)；The output terminal of No.1 balance photoelectric detection unit (18) is connected to the input terminals of No.1 control unit (15), and one
The output terminal of number control unit (15) is connected to No.1 femto-second laser (14)；
The structure of No. two femtoseconds lock phase repeater (3) is：The laser that No. two femto-second lasers (26) send out passes through No. seven four
It is divided into two beams after/mono- wave plate (27) and No. five polarization spectroscopes (28)；Wherein through Beam passes through No. eight quarter-waves
No. three femtosecond lock phase repeaters (4) of directive, another beam reflected light are inclined by No. four afterwards for piece (29) and No. six beam-expanding collimation devices (30)
Shaking, directive two balances photoelectric detection units (24) to spectroscope (23) afterwards；Meanwhile emitted from No.1 femtosecond lock phase repeater (2)
The laser come is also penetrated after No. five beam-expanding collimation devices (21), No. six quarter-wave plates (22) and No. four polarization spectroscopes (23)
To No. two balance photoelectric detection units (24)；The output terminal of No. two balance photoelectric detection units (24) is connected to No. two control units
(25) input terminal, the output terminal of No. two control units (25) are connected to No. two femto-second lasers (26)；
The structure of No. three femtoseconds lock phase repeater (4) is：The laser that No. three femto-second lasers (33) send out passes through No. ten four
It is divided into two beams after/mono- wave plate (35) and No. six polarization spectroscopes (36)；Wherein through Beam passes through ride on Bus No. 11 a quarter
Directive measurement end (1), another beam reflected light are emitted directly toward No. three balance photoelectricity afterwards for wave plate (38) and No. eight beam-expanding collimation devices (39)
Probe unit (37)；Meanwhile the laser launched from No. two femtosecond lock phase repeaters (3) passes through No. seven beam-expanding collimation devices
(31), also directive three balances after No. nine quarter-wave plates (32), No. two speculums (50) and No. six polarization spectroscopes (36)
Photoelectric detection unit (37)；The output terminal of No. three balance photoelectric detection units (37) is connected to the input of No. three control units (34)
End, the output terminal of No. three control units (34) are connected to No. three femto-second lasers (33).
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