CN105048273A - Method for reducing synchronization time jitter in synchronization time lens light source - Google Patents

Method for reducing synchronization time jitter in synchronization time lens light source Download PDF

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CN105048273A
CN105048273A CN201510385677.6A CN201510385677A CN105048273A CN 105048273 A CN105048273 A CN 105048273A CN 201510385677 A CN201510385677 A CN 201510385677A CN 105048273 A CN105048273 A CN 105048273A
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light source
time
mode
locked laser
pulse
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CN105048273B (en
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邱娉
王科
王凯
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Shenzhen University
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Abstract

The invention is applicable to the laser technology field, and provides a method for reducing synchronization time jitter in a synchronization time lens light source. The synchronization time lens light source comprises a time lens light source generating a first pulse sequence and a mode locked laser generating a second pulse sequence. The method includes carrying out optical delay compensation of (n-1)*c/fr between the output optical path of the time lens light source and the output optical path of the mode locked laser, so that the first light pulses of the first pulse sequence and the second pulse sequence reach an imaging sample at a same moment, wherein n is a natural number greater than one, fr is the output mode locked optic pulse repetition rate of the mode locked laser , and c is the light velocity in vacuum. The purpose of reducing synchronization time jitter is achieved by matching optical delay between the output laser pulses of the synchronization time lens light source and the mode locked laser. The synchronization time jitter is effective minimized, and method is applicable to imaging and other situations to obtain stable signals.

Description

A kind of method of shake lock in time reduced in lens light source lock in time
Technical field
The invention belongs to laser technology field, particularly relate to a kind of method of shake lock in time reduced in lens light source lock in time.
Background technology
Time lens compression is a kind of mode producing ultrashort pulse.Time lens apply quadratic phase modulation to input light in time-domain, are similar to space lens and modulate in light addition of wavefronts quadratic phase.In an experiment, quadratic phase modulation can drive electro-optic phase modulator to realize by a sinusoidal drive signals.After dispersion compensation, can to practice midwifery raw infrared lasers sequence from continuous wave (CW) laser straight.Adopt the such as technology such as time lens-ring or soliton self-frequency sh, even can produce femtosecond pulse by time lens light source.
The repetition rate of the laser pulse that mode-locked laser exports is determined by Resonant Intake System, and the repetition rate of time lens light source is determined by electric drive signal completely.Therefore, derive from the condition of mode-locked laser at this electric drive signal under, time lens light source has the ability being synchronized to mode-locked laser.Experiment proves, time lens light source can be synchronized to based on optical fiber and solid-state femtosecond or psec mode-locked laser.On this basis, psec lens lock in time light source has become the ideal chose of coherent Raman scattering (CRS) imaging.CRS imaging needs the vibrational transition in dichromatism psec synchronous lasing light emitter detection biological or chemical sample usually.In CRS imaging experiment, lock in time, lens light source obtained multiple application, as single-frequency coherent anti-stokes raman scattering (CARS) and stimulated Raman scattering (SRS) imaging, spectrum SRS imagings etc., image taking speed can reach frame of video speed.
Shake lock in time is the key parameter of the net synchronization capability weighed between flow image velocimetry.In CRS imaging, it is violent that large time jitter can cause picture signal to change, and this is totally unfavorable to imaging, says nothing of the quantitative analysis of image.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of shake lock in time reduced in lens light source lock in time, aim to provide a kind of by match time lens light source and mode-locked laser between optical delay reach and reduce shake lock in time.
The present invention realizes like this, a kind of method of shake lock in time reduced in lens light source lock in time, described lock in time, lens light source comprised for generation of the time lens light source of the first pulse train and the mode-locked laser for generation of the second pulse train, described mode-locked laser also produces electric pulse for driving described time lens light source, and before the synchronization, the 1st light pulse in described first pulse train and the n-th light pulse in described second pulse train arrive Imaged samples at synchronization;
Described method comprises the steps:
Between the output light path and the output light path of described mode-locked laser of described time lens light source, the optical delay carrying out (n-1) * c/fr compensates, and the 1st light pulse in the in described first pulse train the 1st light pulse and described second pulse train is arrived at synchronization;
Wherein, n be greater than 1 natural number, fr is the output locked mode optical pulse repetition rate of mode-locked laser, and c is the light velocity in vacuum.
Further, described optical delay compensates and is specially:
The output light path of described mode-locked laser is increased the Free Space Optics delay that length is (n-1) * c/fr.
Further, described matching process comprises:
The Free Space Optics being (n-1) * c/fr by described lens light source output light path reduction lock in time length postpones.
Further, described mode-locked laser comprises any one in solid mode-locked laser, optical fiber mode locked laser, dye mode-locking laser.
The present invention compared with prior art, beneficial effect is: by the optical delay between match synchronization time lens light source and mode-locked laser output laser pulse, reach the object reducing shake lock in time, effectively can reduce shake lock in time, in the application such as imaging, obtain stabilization signal.
Accompanying drawing explanation
Fig. 1 be prior art provide lock in time lens light source simplified block diagram.
Fig. 2 a be the analog computation that Numerical Experiment provides lock in time lens light source output spectrum figure;
Fig. 2 b be Numerical Experiment provide lock in time lens light source compression after time-activity curve figure.
Fig. 3 is three kinds of typical analog case comparison diagrams that Numerical Experiment provides.
Fig. 4 is the function changing relation figure that lock in time, shake was shaken with the mode-locked laser intrinsic time that Numerical Experiment provides.
Fig. 5 is that the difference that Numerical Experiment provides postpones the function changing relation figure of situation shake lower lock in time with the shake of mode-locked laser intrinsic time.
Fig. 6 a is the situation that the do not postpone function changing relation figure that lower lock in time, shake was shaken with the mode-locked laser intrinsic time that Numerical Experiment provides.
Fig. 6 b and Fig. 6 c is the situation comparison diagram corresponded respectively to without delay and delay 8 pulses that Numerical Experiment provides respectively.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Lock in time, lens light source was suitable for multiple coherent Raman scattering (CRS) imaging applications, and image taking speed can reach frame of video speed.CRS imaging needs the pulse of two wavelength, mode-locked laser and lock in time lens light source a wavelength is provided respectively separately, two wavelength pulse actings in conjunction could imaging in sample.In lock in time lens light source, shake lock in time between time lens light source and mode-locked laser is a key parameter for estimating net synchronization capability.The present invention proposes a kind of method reducing shake lock in time.Result of study shows, due to lock in time lens light source and mode-locked laser output laser pulse between there is optical delay, lock in time, shake was shaken close to the intrinsic time of mode-locked laser, and lock in time, the further reduction of shake can be realized by the optical delay between match synchronization time lens light source and mode-locked laser.
In an experiment, can shake by measuring lock in time with the mode frequently produced, and measured value relies on different mode-locked lasers and changes.In invention, shown by numerical simulation, due to lock in time lens light source and mode-locked laser between optical delay, lock in time, shake was shaken close to the intrinsic time of mode-locked laser.Mode-locked laser can be the mode-locked laser of arbitrary form, comprises solid mode-locked laser, optical fiber mode locked laser, dye mode-locking laser etc.
As shown in Figure 1, be one typical lock in time lens light source simplified block diagram.The laser pulse (such as, 80MHz) that mode-locked laser exports converts radio frequency (RF) electric pulse of identical repetition rate to, is then divided into two-way.One route one arrowband RF filters filter is to obtain the sine wave of 10GHz to drive phase-modulator, and another road (80MHz) drives Mach-Zehnder intensity modulator (MZ), directly produce the synchronizable optical pulse of 80-MHz from continuous light.By time lens light source being exported pulse compression to picosecond magnitude after dispersion compensator (DC) dispersion compensation, be applicable to CRS imaging.Because all radio frequency (RF) drive singal directly produce from mode-locked laser, therefore can realize synchronous.
Similar with the experimental provision of reality, in numerical simulation, suppose that the repetition rate of the laser pulse that mode-locked laser exports is 80MHz.125th rd harmonic signal of the repetition rate (10GHz) of this 80MHz is filtered to drive the video stretching of phase-modulator by 50 megahertzes (3-dB bandwidth) band pass filter.Phase-modulation performs in the time domain, and the electric field of light modulated is provided by following formula:
E(t)＝E 0exp{iπV ppcos[ω(t)t]/2V π}-----(1)
Wherein, E 0the amplitude of continuous light, V ppbe 10-GHz radiofrequency signal P-to-P voltage, V πthat phase-modulator reaches π phase shift driving voltage.Here, there is intrinsic time shake in the laser pulse exported due to mode-locked laser, the frequency of driving voltage ω is no longer constant in 10GHz.On the contrary, it is the function of time, represents with ω (t).V pp/ V πselection gist be match with experimental result, as Fig. 2 (a), be that the RF of 10GHz driven in an experiment.After MZ, light output is the pulse train of 80Hz, 70-ps, has Gaussian pulse shape.Compressed pulse widths after dispersion compensation is 1.7ps, as Fig. 2 (b), similar with experimental result.
In Numerical Experiment, in order to calculate lock in time lens light source and mode-locked laser export laser pulse lock in time shake (σ syn), the intrinsic time shake (σ of the laser pulse that the mode-locked laser adopting white Gaussian noise simulation to have different root mean square (RMS) value exports mL).Here, it is emphasized that lock in time lens light source and the laser pulse that exports of mode-locked laser between have optical delay, be due to various components and parts, comprise that RF cable and optical fiber etc. introduces.In experiment, the laser pulse that lock in time, lens light source exported postpones for 112.5ns, in other words, is exactly that laser pulse that lock in time, lens light source exported compares with the laser pulse that mode-locked laser exports and has been delayed by 9 light pulses.In numerical simulation, consider exist between two synchronous laser pulse sequence and there is not the situation of optical delay.
The numerical simulation result of shake lock in time
A. there is light delay between two laser pulse sequence:
First the situation that there is light delay is considered.Fig. 3 shows three typical analog case, supposes σ mL=200fs, the laser pulse that lock in time, lens light source exported has been delayed by 9 pulses.Square and circle represent mode-locked laser and lock in time lens light source output laser pulse the relative position (relative to non-jitter) of peak value.In other words, they are shaken for measure time.Therefore, jitter sigma lock in time between two laser pulse strings can be calculated syn., Fig. 4 shows σ synwith σ mLfunction changing relation.Each data point (square) is identical σ mLthe mean value calculated for continuous ten times, error bars shows standard deviation.Very clearly can find out σ synalong with σ mLchange, σ synaverage specific σ mLlarge 20%-25%.This extra time jitter is derived from the time jitter of lens light source lock in time.
Because experimental provision is different, lock in time, the output of lens light source may can not be delayed by 9 pulses.Therefore, the different delay and different σ is calculated mLσ under condition syn, as shown in Figure 5.Each data point remains ten mean values run continuously.For σ different in a large number mLif lens light source exported and was delayed by two light pulses or more, so time jitter σ lock in time synlarge change would not be there is or almost independent of the change of optical delay.But, if lock in time, lens light source exported an only delay light pulse, and larger Late phase ratio (>=2 optical pulse), σ synwill 10% be reduced.
B. optical delay is not had between two laser pulse sequence:
Do not have the situation of optical delay between following consideration two laser pulse sequence, the n-th (n is positive integer) pulse that namely lock in time, lens light source exported and the n-th pulse that mode-locked laser exports arrive in time simultaneously.In an experiment, this can by introducing extra delay in the output of locked laser, or by lock in time lens light source light path or circuits shortens (such as, using shorter radio frequency cable and optical fiber) realize.Fig. 6 (a) shows σ synwith σ mLfunction changing relation.Optical delay is not had, σ between two laser pulses synbeing only 1/3 of those larger delays, is original intrinsic time jitter sigma mL40%.This can easily understand, if compare the peak [Fig. 6 (b) and 6 (c)] of two synchronization bursts.Drive singal due to lens lock in time source produces from mode-locked laser, the time [Fig. 6 (b)] that the mode-locked laser that the time fluctuation that lock in time, lens light source exported is followed exports. consequently, and relative time jitter sigma synvery little.If have very large optical delay between two laser pulses, because the intrinsic time shake of mode locked laser is independently, so correlation [Fig. 6 (c)] would not be had again between lens light source output lock in time and mode-locked laser.These results show, reduce lock in time shake effective means be coupling two laser pulse sequence between optical delay.
Supposing that mode-locked laser exports pulse recurrence rate is fr, first laser pulse that lock in time, lens light source exported overlaps with n-th (n>1) individual laser pulse that mode-locked laser exports, then in order to match synchronization time lens light source and mode-locked laser export the delay of pulse, first pulse making them export overlaps in time, then mode-locked laser exports should increase the Free Space Optics that length is (n-1) * c/fr and postpone, and wherein c is the light velocity in vacuum.Or equivalence, lens light source should reduce the Free Space Optics that length is (n-1) c/fr and postponed lock in time.
Such as when in sync between lens light source export first laser pulse overlap with the 10th light pulse that mode-locked laser exports, when mode-locked laser repetition rate is 80MHz, mode-locked laser output light path should increase the free space light path of 33.75m length, can synchronization acquisition time lens light source export first laser pulse overlap in time with first laser pulse that mode-locked laser exports.The increase of free space light path can be realized by polygonal mirror multiple reflections.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. one kind reduces the method for shake lock in time in lens light source lock in time, it is characterized in that, described lock in time, lens light source comprised for generation of the time lens light source of the first pulse train and the mode-locked laser for generation of the second pulse train, described mode-locked laser also produces electric pulse for driving described time lens light source, and before the synchronization, the 1st light pulse in described first pulse train and the n-th light pulse in described second pulse train arrive Imaged samples at synchronization;
Described method comprises the steps:
Between the output light path and the output light path of described mode-locked laser of described time lens light source, the optical delay carrying out (n-1) * c/fr compensates, and the 1st light pulse in the in described first pulse train the 1st light pulse and described second pulse train is arrived at synchronization;
Wherein, n be greater than 1 natural number, fr is the output locked mode optical pulse repetition rate of mode-locked laser, and c is the light velocity in vacuum.
2. the method for claim 1, is characterized in that, described optical delay compensates and is specially:
The output light path of described mode-locked laser is increased the Free Space Optics delay that length is (n-1) * c/fr.
3. the method for claim 1, is characterized in that, described matching process comprises:
The Free Space Optics being (n-1) * c/fr by described lens light source output light path reduction lock in time length postpones.
4. the method for claim 1, is characterized in that, described mode-locked laser comprise in solid mode-locked laser, optical fiber mode locked laser, dye mode-locking laser any one.
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