CN108287024B - Femtosecond pulse carrier_envelop phase offset frequency measuring equipment - Google Patents
Femtosecond pulse carrier_envelop phase offset frequency measuring equipment Download PDFInfo
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- CN108287024B CN108287024B CN201810034303.3A CN201810034303A CN108287024B CN 108287024 B CN108287024 B CN 108287024B CN 201810034303 A CN201810034303 A CN 201810034303A CN 108287024 B CN108287024 B CN 108287024B
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- 230000010287 polarization Effects 0.000 claims abstract description 122
- 239000013307 optical fiber Substances 0.000 claims abstract description 120
- 230000005622 photoelectricity Effects 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 14
- 230000035559 beat frequency Effects 0.000 claims abstract description 7
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 230000001154 acute effect Effects 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims description 24
- 239000000835 fiber Substances 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 10
- 238000001228 spectrum Methods 0.000 claims description 7
- 239000004038 photonic crystal Substances 0.000 claims description 5
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 10
- 230000000644 propagated effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- XBJJRSFLZVLCSE-UHFFFAOYSA-N barium(2+);diborate Chemical compound [Ba+2].[Ba+2].[Ba+2].[O-]B([O-])[O-].[O-]B([O-])[O-] XBJJRSFLZVLCSE-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000007430 reference method Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- 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
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Lasers (AREA)
Abstract
The present invention provides a kind of femtosecond pulse carrier_envelop phase offset frequency measuring equipments, comprising: supercontinuum generation device is used to generate the supercontinum including the light near fundamental frequency light and first wave length；Frequency-doubling crystal is used to transmit the fundamental frequency light and the light near the first wave length is carried out frequency multiplication and projects frequency doubled light；First polarization maintaining optical fibre, the second polarization maintaining optical fibre and third polarization maintaining optical fibre, angle between the slow axis of second polarization maintaining optical fibre and the first polarization maintaining optical fibre and the slow axis of polarization maintaining optical fibre is acute angle, and the second polarization maintaining optical fibre is for keeping the fundamental frequency light in its fast axle and the frequency doubled light on slow axis synchronous in time；Polarization beam splitter prism is emitted the synchronous, frequency doubled light with identical polarization state and fundamental frequency light；Photoelectricity amplifies detector, is used to measure the frequency doubled light with identical polarization state and the carrier_envelop phase offset frequency signal after fundamental frequency light beat frequency.It is the negligible amounts of femtosecond pulse carrier_envelop phase offset frequency measuring equipment component of the invention, at low cost.
Description
Technical field
The present invention relates to carrier_envelop phase offset frequency measuring equipments, and in particular to a kind of femtosecond pulse carrier_envelop phase offset frequency
Rate measuring device.
Background technique
Femtosecond pulse shows as periodically equally spaced pulse in the time domain, is divided into the inverse of mode locking repetition rate therebetween.
It is optical carrier inside pulse, and outside pulse is the envelope of pulse, the phase between envelope and carrier wave is referred to as carrier envelope
Phase (Carrier-Envelop Phase, CEP).Since the group velocity of laser pulse in the medium and phase velocity angle value be not identical,
Cause envelope and the carrier-wave transmission speed of each laser pulse different, to make each laser pulse that there is different CEP.
The difference of two pulse CEP is defined as carrier_envelop phase offset (Carrier-Envelop Offset, CEO), the as variation of CEP
Amount.
There are mainly two types of the methods of measurement CEO at present.One is T.Fuji et al. (T.Fuji, et al.New Journal
Of Physics 7,116 (2005)) propose the method (0-f scheme) from difference frequency, i.e., using oscillator generate quasi- octave
The spectrum of two sides carries out difference frequency, and is generated using fundamental frequency light and difference frequency optical sccond-harmonic generation and detect carrier_envelop phase offset frequency.From difference frequency
Method have certain requirement to the spectrum and pulsewidth of oscillator, spectrum is as wide as possible, and close to an octave, pulsewidth will be pressed
10 femtoseconds are reduced to hereinafter, being just able to achieve the detection of carrier_envelop phase offset signal.The Ti:Sapphire oscillator of only sub- 10 femtoseconds at present
It is able to satisfy this condition.Another kind is H.R.Telle et al. (H.R.Telle, et al.Applied Physics B:Lasers
And Optics 4,69 (1999)) propose self-reference method (f-2f scheme), utilize highly nonlinear optical fiber carry out spectrum expansion
Exhibition obtains the supercontinum more than an octave, the frequency doubled light and super continuum light after low frequency optical sccond-harmonic generation in supercontinum
Carrier_envelop phase offset frequency signal is obtained with the fundamental frequency light beat frequency of frequency with frequency doubled light in spectrum.
Self-reference technique (f-2f) is the general technology for measuring carrier_envelop phase offset frequency signal at present.F-2f optical path
It is space optical path structure, beat frequency measurement is carried out using the optical interference circuit that optical element builds two-way or single channel.It has following two
Disadvantage: first, f-2f optical path at least need 10 or more optical elements, the component used is more, it is at high cost, occupy
Space is big, its structure and optical path adjusting are complicated；Second, the mechanical shaking of the component in optical path introduces additional noise, unfavorable
In the long-term locking of carrier_envelop phase offset frequency signal.
Summary of the invention
For above-mentioned technical problem of the existing technology, the embodiment provides a kind of femtosecond pulse carrier wave packets
Network phase shifting frequencies measuring device, comprising:
Supercontinuum generation device, is used to generate supercontinum, and the supercontinum includes fundamental frequency light and
Light near one wavelength；
Frequency-doubling crystal is used to transmit the fundamental frequency light and the light near the first wave length is carried out frequency multiplication and is projected again
Frequency light, the frequency of the fundamental frequency light are equal to the frequency of the frequency doubled light；
First polarization maintaining optical fibre, the second polarization maintaining optical fibre and third polarization maintaining optical fibre, the both ends of second polarization maintaining optical fibre respectively with
First polarization maintaining optical fibre and third polarization maintaining optical fibre welding, the slow axis of second polarization maintaining optical fibre and first polarization maintaining optical fibre and
Angle between the slow axis of third polarization maintaining optical fibre is acute angle, and second polarization maintaining optical fibre is used to making fundamental frequency light in its fast axle and slow
Frequency doubled light on axis synchronizes in time；
Polarization beam splitter prism, incidence end are connected to the third polarization maintaining optical fibre, and are emitted and synchronize, have identical polarization state
Frequency doubled light and fundamental frequency light；
Photoelectricity amplifies detector, is used to measure the frequency doubled light with identical polarization state and the carrier wave packet after fundamental frequency light beat frequency
Network phase shifting frequencies signal.
Preferably, the angle between the slow axis of second polarization maintaining optical fibre and the slow axis of first polarization maintaining optical fibre is 43 °
Angle between~47 ° and the slow axis of the third polarization maintaining optical fibre is 43 °~47 °.
Preferably, the angle between the slow axis of second polarization maintaining optical fibre and the slow axis of first polarization maintaining optical fibre is
Angle between 44.5 °~45.5 ° and the slow axis of the third polarization maintaining optical fibre is 44.5 °~45.5 °.
Preferably, the angle between the slow axis of second polarization maintaining optical fibre and the slow axis of first polarization maintaining optical fibre be 45 °,
Angle between the slow axis of the third polarization maintaining optical fibre is 45 °.
It preferably, further include being connected between the supercontinuum generation device and the incidence end of the frequency-doubling crystal
Polarization maintaining optical fibre, and the polarization-maintaining being connected between the exit end of the polarization beam splitter prism and the incidence end of photoelectricity amplification detector
Optical fiber.
Preferably, further include positioned at the frequency-doubling crystal exit end and photoelectricity amplification detector incidence end optical path it
Between bandpass optical filter, the central wavelength of the bandpass optical filter is identical as the wavelength of the fundamental frequency light, for by the fundamental frequency
Light near the wavelength of light is separated.
Preferably, the bandpass optical filter is located at the exit end of the polarization beam splitter prism and entering for photoelectricity amplification detector
It penetrates between end.
Preferably, the wave-length coverage of the supercontinum is 650-1550 nanometers, and the wavelength of the frequency doubled light is received for 761
Rice, the bandpass optical filter are used to transmit 730-770 nanometers of light.
Preferably, the supercontinuum generation device includes:
Femto second optical fiber laser is used to generate femtosecond pulse；
Photonic crystal fiber is used to the femtosecond pulse carrying out frequency expansion to export the supercontinum.
Preferably, the frequency-doubling crystal is periodically poled lithium niobate crystal or BBO Crystal.
The negligible amounts of femtosecond pulse carrier_envelop phase offset frequency measuring equipment component of the invention, at low cost, saving
Space, and all optical fibre structure is realized, the stability and reliability of measurement are substantially increased, signal-to-noise ratio is improved.
Detailed description of the invention
Embodiments of the present invention is further illustrated referring to the drawings, in which:
Fig. 1 is that the structure of the femtosecond pulse carrier_envelop phase offset frequency measuring equipment of one embodiment according to the present invention is shown
It is intended to.
Fig. 2 is the super continuum light spectrogram that supercontinuum generation device shown in FIG. 1 generates.
Fig. 3 is the welding process schematic diagram of polarization maintaining optical fibre shown in FIG. 1.
Fig. 4 is the schematic diagram of the compensation of delay principle of polarization maintaining optical fibre shown in FIG. 1.
Fig. 5 is that the structure of the femtosecond pulse carrier_envelop phase offset frequency measuring equipment of second embodiment according to the present invention is shown
It is intended to.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, pass through below in conjunction with attached drawing specific real
Applying example, the present invention is described in more detail.
Fig. 1 is that the structure of the femtosecond pulse carrier_envelop phase offset frequency measuring equipment of one embodiment according to the present invention is shown
It is intended to.As shown in Figure 1, femtosecond pulse carrier_envelop phase offset frequency measuring equipment 10 includes supercontinuum generation device 1, period
Poled lithium Niobate (PPLN) 2, be connected to PPLN2 exit end the first polarization maintaining optical fibre 13, molten with the first polarization maintaining optical fibre 13
The second polarization maintaining optical fibre 3 for connecing is put with the third polarization maintaining optical fibre 14, polarization beam splitter prism 4 and photoelectricity of 13 welding of the second polarization maintaining optical fibre
Big detector 6.
Supercontinuum generation device 1 includes a femto second optical fiber laser and photonic crystal fiber.Femtosecond fiber laser
Oscillator in device is all -fiber oscillator based on semiconductor saturable absorbing mirror, is amplified by two-stage chirped pulse amplification device
Later, using prism to compressing.The output power of femto second optical fiber laser is 3 watts or so, the central wavelength of femtosecond pulse
It is 1035 nanometers, pulse width is about 100 femtoseconds, repetition rate is about 70MHz.Femtosecond pulse is coupled into photonic crystal fiber
In, the nonlinear effect based on photonic crystal fiber generates the supercontinum more than an octave.
Fig. 2 is the super continuum light spectrogram that supercontinuum generation device shown in FIG. 1 generates.As shown in Fig. 2, femtosecond pulse
Central wavelength be 1035 nanometers, the frequency range of supercontinum is 650-1550 nanometers comprising near 1522 nanometers
Fundamental frequency light near light and 761 nanometers.
PPLN 2 is a kind of nonlinear crystal for capableing of frequency multiplication, for transmiting supercontinum and will be in supercontinum
Optical sccond-harmonic generation near 1522 nanometers is to generate the frequency doubled light near 761 nanometers.Due to biography of the light in PPLN 2 of different wave length
Speed difference is broadcast, causes fundamental frequency light that there is certain delay (such as 0.3 picosecond) compared to frequency doubled light.
The both ends of second polarization maintaining optical fibre 3 respectively with 14 welding of the first polarization maintaining optical fibre 13 and third polarization maintaining optical fibre.Fig. 3 is Fig. 1
Shown in polarization maintaining optical fibre welding process schematic diagram, three figures below the arrow of Fig. 3 are the first polarization maintaining optical fibre 13, second respectively
The end view drawing that polarization maintaining optical fibre 3 and third polarization maintaining optical fibre 14 are seen along optical propagation direction, slow axis are shown in dotted line.As shown in figure 3,
Welding at 45 ° between the slow axis of first polarization maintaining optical fibre 13 and the slow axis of the second polarization maintaining optical fibre 3, the slow axis of the second polarization maintaining optical fibre 3 with
Welding at 45 ° between the slow axis of third polarization maintaining optical fibre 14.
Fig. 4 is the schematic diagram of the compensation of delay principle of polarization maintaining optical fibre shown in FIG. 1, in order to clearly show compensation of delay original
Reason, Fig. 4 illustrate only the fundamental frequency light in frequency doubled light and supercontinum, and wherein the left side is on the slow axis of the first polarization maintaining optical fibre 13
Frequency doubled light and fundamental frequency light, centre are frequency doubled light and fundamental frequency light on the slow axis and fast axle of the second polarization maintaining optical fibre 3, and the right is third guarantor
Frequency doubled light and fundamental frequency light on the slow axis and fast axle of polarisation fibre 14.Light on the slow axis of first polarization maintaining optical fibre 13 enters second simultaneously
The slow axis and fast axle (perpendicular to slow axis) of polarization maintaining optical fibre 3 are propagated, using the light principle different with the spread speed of slow axis in fast axle,
Second polarization maintaining optical fibre 3 makes the light on its slow axis than 0.3 picosecond of light delay in fast axle, thus in the fast axle of the second polarization maintaining optical fibre 3
Fundamental frequency light and the frequency doubled light on slow axis it is synchronous in time.Frequency doubled light and fundamental frequency light after compensation of delay are incident to third
In polarization maintaining optical fibre 14, wherein a part of frequency doubled light and fundamental frequency light in the fast axle of the first polarization maintaining optical fibre 13 is in third polarization maintaining optical fibre
It is propagated in 14 fast axle, another part is propagated on the slow axis of third polarization maintaining optical fibre 14；The slow axis of same first polarization maintaining optical fibre 13
On frequency doubled light and a part of fundamental frequency light is propagated in the fast axle of third polarization maintaining optical fibre 14, another part is in third polarization maintaining optical fibre
It is propagated on 14 slow axis, thus with frequency doubled light and fundamental frequency light synchronous on the time on the slow axis of third polarization maintaining optical fibre 14, and fastly
Also with frequency doubled light and fundamental frequency light synchronous on the time on axis.Frequency doubled light and fundamental frequency light are in slow axis and fast axle as seen from Figure 4
On all some be overlapped, this intersection may be used to beat frequency.
Polarization beam splitter prism 4 filters the light in fast axle, the light on reservation slow axis, synchronizes to be emitted, has identical polarization
The frequency doubled light and fundamental frequency light of state are to carry out beat frequency.
Photoelectricity amplifies the silicon avalanche photodetector that 6 selection work wavelength of detector is 400-1000 nanometers to detect carrier wave
Envelope phase shifting frequencies signal.
It is protected in femtosecond pulse carrier_envelop phase offset frequency measuring equipment 10 of the invention using the second polarization maintaining optical fibre 3 and first
The welding at an acute angle of the slow axis of polarisation fibre 13, make frequency doubled light in the fundamental frequency light and slow axis in the fast axle of the second polarization maintaining optical fibre 3 when
Between it is upper synchronize, realize compensation of delay.The slow axis welding at an acute angle of the second polarization maintaining optical fibre 3 and third polarization maintaining optical fibre 14 is recycled,
So that the frequency doubled light of frequency doubled light and fundamental frequency light on the frequency doubled light and fundamental frequency phototiming, fast axle on the slow axis of third polarization maintaining optical fibre 14
With fundamental frequency phototiming.Reduce the quantity of component, it is at low cost, while complicated, accurate optical path adjusting process is omitted.
Referring again to shown in Fig. 1, femtosecond pulse carrier_envelop phase offset frequency measuring equipment 10 further include be connected to it is super continuous
Optical fiber 12 between spectrum generation device 1 and the incidence end of PPLN 2, the exit end and photoelectricity for being connected to polarization beam splitter prism 4 are put
Optical fiber 16 between the incidence end of big detector 6.It is thus achieved that all optical fibre structure, is omitted complicated optical path adjusting process,
Substantially increase the stability of measuring device.
In the above-described embodiments, the slow axis of the second polarization maintaining optical fibre 3 and the first polarization maintaining optical fibre 13 and third polarization maintaining optical fibre 14
The angle of slow axis is all 45 °, so that the slow axis of frequency doubled light and fundamental frequency light in the second polarization maintaining optical fibre 3 and the light component phase in fast axle
Deng and light component on the slow axis and fast axle of third polarization maintaining optical fibre 14 it is equal so that carrier_envelop phase offset frequency signal is strong
Degree is maximum, to improve signal-to-noise ratio.Therefore, the second polarization maintaining optical fibre 3 and the first polarization maintaining optical fibre 13, third polarization maintaining optical fibre 14 it is molten
In termination process so that the angle between the slow axis of the second polarization maintaining optical fibre 3 and the slow axis of the first polarization maintaining optical fibre 13 be 43 °~47 ° and
Angle between the slow axis of third polarization maintaining optical fibre 14 is 43 °~47 °, preferably in 44.5 °~45.5 °, more preferably 45 °.
Fig. 5 is that the structure of the femtosecond pulse carrier_envelop phase offset frequency measuring equipment of second embodiment according to the present invention is shown
It is intended to.It is essentially identical with Fig. 1, and difference is, femtosecond pulse carrier_envelop phase offset frequency measuring equipment 20 further includes band logical filter
Wave device 25 is connected with optical fiber 215, exit end between the incidence end of bandpass filter 25 and the exit end of polarization beam splitter prism 24
Optical fiber 216 is connected between the incidence end of photoelectricity amplification detector 26.The central wavelength of bandpass filter 25 and fundamental frequency light
Wavelength is identical, for separating 730-770 nanometers of light, the light of other wavelength is avoided to be incident on photoelectricity amplification detector 26
In, reduce the influence to beat signal, improves signal-to-noise ratio.
In other embodiments of the invention, bandpass filter 25 is connected to PPLN 22 and second by polarization maintaining optical fibre and protects
Between polarisation fibre 23, or it is connected between the second polarization maintaining optical fibre 23 and polarization beam splitter prism 24.
According to other embodiments of the invention, optical fiber 12, optical fiber 16, optical fiber 213, optical fiber 215, optical fiber 216 are all polarization-maintaining
Optical fiber, it is ensured that the polarization state of femtosecond laser is constant, improves the reliability of measurement.
In other embodiments of the invention, polarization beam splitter prism filters the light on slow axis, the light in reservation fast axle.
Photoelectricity amplification detector is not limited to silicon avalanche photodetector, in other embodiments of the invention, may be used also
To be other photodetectors, as long as the wavelength of the range covering frequency doubled light of its operation wavelength.
In other embodiments of the invention, it selects erbium doped fiber laser as supercontinuum generation source, selects inclined
Barium borate crystal is as frequency-doubling crystal.
Although the present invention has been described by means of preferred embodiments, the present invention is not limited to described here
Embodiment, without departing from the present invention further include made various changes and variation.
Claims (10)
1. a kind of femtosecond pulse carrier_envelop phase offset frequency measuring equipment characterized by comprising
Supercontinuum generation device, is used to generate supercontinum, and the supercontinum includes fundamental frequency light and first wave
Light near long；
Frequency-doubling crystal is used to transmit the fundamental frequency light and the light near the first wave length is carried out frequency multiplication and projects frequency multiplication
Light, the frequency of the fundamental frequency light are equal to the frequency of the frequency doubled light；
First polarization maintaining optical fibre, the second polarization maintaining optical fibre and third polarization maintaining optical fibre, it is brilliant that first polarization maintaining optical fibre is connected to the frequency multiplication
The exit end of body, the both ends of second polarization maintaining optical fibre respectively with first polarization maintaining optical fibre and third polarization maintaining optical fibre welding, institute
The angle stated between the slow axis of the second polarization maintaining optical fibre and first polarization maintaining optical fibre and the slow axis of third polarization maintaining optical fibre is acute angle, institute
The second polarization maintaining optical fibre is stated for keeping the fundamental frequency light in its fast axle and the frequency doubled light on slow axis synchronous in time；
Polarization beam splitter prism, incidence end are connected to the third polarization maintaining optical fibre, and are emitted synchronous times with identical polarization state
Frequency light and fundamental frequency light；
Photoelectricity amplifies detector, is used to measure the frequency doubled light with identical polarization state and the carrier envelope phase after fundamental frequency light beat frequency
Move frequency signal.
2. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to claim 1, which is characterized in that described second
Angle between the slow axis of polarization maintaining optical fibre and the slow axis of first polarization maintaining optical fibre is 43 °~47 ° and the third polarization maintaining optical fibre
Slow axis between angle be 43 °~47 °.
3. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to claim 2, which is characterized in that described second
Angle between the slow axis of polarization maintaining optical fibre and the slow axis of first polarization maintaining optical fibre is 44.5 °~45.5 ° and the third polarization-maintaining
Angle between the slow axis of optical fiber is 44.5 °~45.5 °.
4. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to claim 3, which is characterized in that described second
Angle between the slow axis of polarization maintaining optical fibre and the slow axis of first polarization maintaining optical fibre is 45 °, slow with the third polarization maintaining optical fibre
Angle between axis is 45 °.
5. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to claim 1, which is characterized in that further include connecting
The polarization maintaining optical fibre between the supercontinuum generation device and the incidence end of the frequency-doubling crystal is connect, and is connected to described
Polarization maintaining optical fibre between the incidence end of exit end and photoelectricity the amplification detector of polarization beam splitter prism.
6. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to any one of claim 1 to 5, feature exist
In, further include positioned at the frequency-doubling crystal exit end and photoelectricity amplification detector incidence end optical path between bandpass filter
Device, the central wavelength of the bandpass optical filter is identical as the wavelength of the fundamental frequency light, for will be near the wavelength of the fundamental frequency light
Light separate.
7. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to claim 6, which is characterized in that the band logical
Optical filter is located between the exit end of the polarization beam splitter prism and the incidence end of photoelectricity amplification detector.
8. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to claim 6, which is characterized in that the super company
The wave-length coverage of continuous spectrum is 650-1550 nanometers, and the wavelength of the frequency doubled light is 761 nanometers, and the bandpass optical filter is for saturating
Penetrate 730-770 nanometers of light.
9. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to any one of claim 1 to 5, feature exist
In the supercontinuum generation device includes:
Femto second optical fiber laser is used to generate femtosecond pulse；
Photonic crystal fiber is used to the femtosecond pulse carrying out frequency expansion to export the supercontinum.
10. femtosecond pulse carrier_envelop phase offset frequency measuring equipment according to any one of claim 1 to 5, feature
It is, the frequency-doubling crystal is periodically poled lithium niobate crystal or BBO Crystal.
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