CN103196570B - Measuring device of ultrafast optical pulse time wave form - Google Patents
Measuring device of ultrafast optical pulse time wave form Download PDFInfo
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- CN103196570B CN103196570B CN201310103586.XA CN201310103586A CN103196570B CN 103196570 B CN103196570 B CN 103196570B CN 201310103586 A CN201310103586 A CN 201310103586A CN 103196570 B CN103196570 B CN 103196570B
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- gaas
- optical waveguide
- pump light
- flashlight
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Abstract
A measuring device of an ultrafast optical pulse time wave form achieves a breakthrough of an existing and traditional streak camera based on photovoltaic conversion and provides time resolution with picosecond magnitude, a measurable time span with hundreds of picosecond magnitude and a measurable dynamic range of 10<3>-10<5> at the same time. The device mainly comprises an optical waveguide unit, a pump light system and a reading system of a high dynamic range, wherein a functional layer of the optical waveguide unit adopts an Al<0.24>Ga<0.76>As /GaAs/Al<0.24>Ga<0.76>As/GaAs/Al <0.24>Ga<0.76>As structure. Two GaAs sandwich layers form two arms of a MZ interferometer. The measuring device has the biggest advantages of solving the technical problems that the prior art is hard to provide with a big dynamic range, time resolution and a measurable time span at the same time, and stability and reliability of vacuum devices are bad.
Description
Technical field
The present invention relates to ultrafast pulse to measure, particularly a kind of measurement mechanism of ultrafast optical pulse time wave form.
Background technology
The part compositions such as traditional streak camera is managed mutually primarily of striped, high tension circuit, trigger-delay circuit, image capturing system and application software.Its principle of work is: flashlight scioptics focus on slit place and form image, then on photocathode, carry out opto-electronic conversion, thus define the electron beam of space distribution, then accelerates through accelerating net, focuses on the focus electrode and is fed into deflection system.After accelerated electron beam enters deflection system, the scanning voltage linear decrease from high to low that external circuit controls, the deflection angle of electron beam constantly changes under scanning voltage effect, expands to space distribution in time.Realize light signal to be converted into electric signal and to measure.But traditional streak camera is based on electronic deflection technology, between the electronics of high-speed motion, namely mutual repulsion is subject to the restriction of space charge effect, and along with the increase of signal light intensity, the pulse of record has broadening phenomenon, while acquisition high time resolution, dynamic range is also restricted.
At first technology 1 [Tian Jinshou, Wang Tao, full light solid streak camera, patent of invention, publication number: 102364396A] and first technology 2 [John E.Heebner, Method For Ultrafast Optical DeflectionEnabling Optical Recording Serrated or Grated Lighted Illumination, Patent No:US7587103B2] temporal resolution of ps magnitude can be reached, there is high dynamic range simultaneously.But Measuring Time span can be difficult to break through 100ps, and need to plate wedge array gold film on optical waveguide top layer, complex operation, coating technique requires strict, and the effect of plated film directly has influence on the temporal resolution can surveying flashlight, dynamic range.And simple based on the full striations camera structure of Ma Zehede interference technique and guide technology, while there is high time resolution and high dynamic range, Measuring Time span also can be improved, have a wide range of applications in ultrafast diagnostic techniques field.
Summary of the invention
The object of the present invention is to provide a kind of ultrafast optical pulse time wave form measurement mechanism, this device has high dynamic range, high temporal resolution and the high feature of the time span that can measure.
Technical solution of the present invention is as follows:
A kind of ultrafast optical pulse time wave form measurement mechanism, mainly comprise: pump light system, the read-out system of optical waveguide cellular system and high dynamic range, wherein the structure of optical waveguide is
Al
0.24ga
0.76as/GaAs/Al
0.24ga
0.76as/GaAs/Al
0.24ga
0.76as/GaAs substrate, two-layer GaAs sandwich layer forms the two arms that MZ interferes.Pump light vertical direction is incident, in optical waveguide, linear light spot is focused into by coupling column lens, flashlight glancing incidence is to optical waveguide, and two-layer GaAs sandwich layer is the optical channel of flashlight, and the optical direction inciding pump light in optical waveguide and flashlight has certain angle.When the whole pulse of flashlight is filled in ducting layer, do not have the place of pump light photograph in optical waveguide core layer, the initial phase difference of the two arms of MZ is (2k+1) * π (k is integer), and flashlight light intensity after MZ interferes is zero, is in delustring state; Have the place of pump light photograph, due to optical non-linear effect, the relative index of refraction of MZ two arms can change, and controls the energy density of pump light, makes the flashlight exported interfere superposition, strengthens after MZ interferes.Through post lens focus to the flashlight in optical waveguide, because the optical direction of pump light and flashlight exists an angle, pump light is radiated at the different time sheet of flashlight, the pulse front edge part of flashlight and trailing edge portion interfere enhancing in a moment different time, thus are converted in spatial domain by the waveform in time domain and measure.
Described pump light system is short pulse pump light system, and the wavelength of pump light is 776nm ~ 874nm, and energy density is 50uJ/cm
2~ 300uJ/cm
2.
The photon energy of described flashlight is less than the bandwidth of GaAs.
The described angle inciding the optical direction of pump light linear light spot in optical waveguide and flashlight is 5 degree ~ 60 degree.
Described read-out system is high dynamic range, high-resolution linear array detector.
Of the present invention have advantage to be:
1, the present invention has abandoned the electron-beam deflection system that the traditional streak camera based on image converter tube technology adopts, adopt and changed by the relative index of refraction of pump light control photo-generated carrier induction light waveguide two sandwich layers, again in conjunction with MZ interference technique, the measurement of the waveform in time domain is reproduced in spatial domain, thus eliminates traditional streak camera and cannot possess the bottleneck factor of high temporal resolution and high dynamic range and the existence of space charge effect simultaneously.
2, the device that the present invention develops can provide the time span surveyed and 10 of the temporal resolution simultaneously with picosecond magnitude, hundred picosecond magnitudes
3-10
5can measurement dynamic range.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of the novel ultrafast optical pulse time wave form measurement mechanism of the present invention.
In figure:
The flashlight of 1-glancing incidence; 2-post lens; The pump light of 3-vertical incidence; 4-through the pump light of post lens focus and the angle of the flashlight direction of propagation; 5-by the hot spot of post lens focus to the pump light in optical waveguide; 12-high-resolution linear array detector; 14-for pump light focus on post lens; 15-optical waveguide.
Fig. 2 is the enlarged drawing of optical waveguide (15) structure in Fig. 1.
In figure:
6-Al
0.24ga
0.76as; 7-GaAs, one of interferometer, horse pool; 8-Al
0.24ga
0.76as;
9-GaAs, horse pool interferometer another; 10-Al
0.24ga
0.76as; 11-post lens; 13-substrate GaAs;
Embodiment
Below in conjunction with embodiment and accompanying drawing, apparatus of the present invention are further described, but should limit the scope of the invention with this.
First refer to Fig. 1, as seen from the figure, the measurement mechanism of ultrafast optical pulse time wave form of the present invention.In optical waveguide, two waveguide core layer form Ma Zehede (MZ) interferometer, and the two arms of MZ interferometer is 7 in Fig. 1 and 9 respectively.The initial phase difference of the two arms of MZ is (2k+1) * π (k is integer), does not add the pump light 3 of vertical incidence, and when flashlight 1 is by MZ interferometer, reach delustring state, exit end does not have flashlight outgoing.When adding pump light 3, the pump light 5 focused on through post lens 14 impinges perpendicularly in optical waveguide, and meanwhile, the whole optical pulse time waveform of flashlight 1 is flatly injected into the two arms of the MZ interferometer in optical waveguide.Due to nonlinear effect, pump light induces two sandwich layer relatives index of refraction to change, and namely the relative index of refraction of the two arms 7 and 9 of MZ interferometer changes, and controls the energy density of pump light, and make the flashlight exported interfere superposition, output intensity increases.Because the direction of propagation of pump light and flashlight exists an angle, pump light is radiated at the different time sheet of flashlight, and the pulse front edge part of flashlight and trailing edge portion interfere enhancing in a moment different time.The time domain waveform of flashlight is converted into the waveform in spatial domain, then is converged by post lens 11, is detected by high-resolution linear array detector 12.
The course of work of the present invention is as follows:
Two sandwich layer GaAs structures of optical waveguide form the two arms of horse pool interferometer, and flashlight flatly incides in optical waveguide, and when the whole burst length, waveform was filled in optical waveguide, pump light passes through post Lens Coupling in optical waveguide.The angle of the hot spot of pump light and the direction of propagation of flashlight is between 5 ° ~ 60 °, the initial phase difference of the two arms of MZ is (2k+1) * π (k is integer), does not have the place of pump light photograph, when flashlight is by MZ interferometer, reach delustring state, exit end does not have flashlight outgoing.When having pump light to shine, due to nonlinear effect, pump light induces two sandwich layer relatives index of refraction to change, namely the relative index of refraction of the two arms GaAs of MZ interferometer changes, control the energy density of pump light, make the flashlight exported interfere superposition, output intensity increases.Because the direction of propagation of pump light and flashlight exists an angle, pump light is radiated at the different time sheet of flashlight, the pulse front edge part of flashlight and trailing edge portion interfere enhancing in a moment different time, thus are converted in spatial domain by the waveform in time domain and measure.
Claims (1)
1. the measurement mechanism of a ultrafast optical pulse time wave form, it is characterized in that the formation of this device: in the light path of flashlight, set gradually the first post lens (2), gallium arsenide optical waveguide, second post lens (11) and high-resolution linear array detector (12), second post lens (14) are set directly over gallium arsenide optical waveguide, pump light (3) is focused into one article of linear light spot (5) through the 3rd post lens (14) and impinges perpendicularly in described optical waveguide, described linear light spot (5) and linear signal light the angle of optical direction be θ, the formation of described gallium arsenide optical waveguide is gallium aluminium arsenic/gallium arsenide/gallium aluminium arsenic/gallium arsenide/gallium aluminium arsenic/gallium arsenide substrate (6, 7, 8, 9, 10, 13), be specially Al
0.24ga
0.76as/GaAs/Al
0.24ga
0.76as/GaAs/Al
0.24ga
0.76as/GaAs, wherein two-layer GaAs forms the sandwich layer (7,9) of two optical waveguides, three layers of Al
0.24ga
0.76as forms the covering (6,8,10) of two optical waveguides respectively, and two GaAs sandwich layers are two-arm (7,9) of Ma Zehede (MZ) interferometer,
The wavelength coverage of described pump light (3) is between 776nm ~ 874nm, and energy density is at 50uJ/cm
2~ 300uJ/cm
2between, the angle theta of described pump light and the optical direction of flashlight is 5 ° ~ 60 °.
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| CN201310103586.XA CN103196570B (en) | 2013-03-27 | 2013-03-27 | Measuring device of ultrafast optical pulse time wave form |
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| CN201310103586.XA CN103196570B (en) | 2013-03-27 | 2013-03-27 | Measuring device of ultrafast optical pulse time wave form |
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| CN103196570A CN103196570A (en) | 2013-07-10 |
| CN103196570B true CN103196570B (en) | 2015-05-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837241A (en) * | 2014-03-26 | 2014-06-04 | 中国工程物理研究院激光聚变研究中心 | Laser pulse waveform meter |
| CN104280140A (en) * | 2014-10-09 | 2015-01-14 | 中国科学院上海光学精密机械研究所 | Measurement device for time waveform and signal to noise ratio of single ultrafast pulse |
| CN106444346B (en) * | 2016-10-31 | 2018-12-14 | 中国科学院西安光学精密机械研究所 | A kind of sub- femtosecond time resolution streak camera of Terahertz driving |
| CN106918395B (en) * | 2017-03-28 | 2019-01-22 | 中国工程物理研究院激光聚变研究中心 | A method of diagnosis ultrashort pulse focousing field spatial and temporal distributions characteristic |
| CN109632705A (en) * | 2019-01-15 | 2019-04-16 | 西安文理学院 | Single-shot femtosecond time resolution absorption spectrum measuring apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886331A (en) * | 1988-03-17 | 1989-12-12 | Environmental Research Institute Of Michigan | Thermo-optically induced waveguide |
| CN1150479A (en) * | 1995-02-07 | 1997-05-21 | Ldt激光展示技术公司 | Combination splitting device composed of strip waveguides and uses thereof |
| CN1635417A (en) * | 2003-12-25 | 2005-07-06 | 电子科技大学 | An integrated optical M-Z structural module converter |
| CN102353465A (en) * | 2011-09-30 | 2012-02-15 | 湖南大学 | Time pulse width measurement system for ultrashort pulses in different spatial positions and measurement method thereof |
| CN102364396A (en) * | 2011-10-24 | 2012-02-29 | 中国科学院西安光学精密机械研究所 | All-optical solid streak camera |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7587103B2 (en) * | 2007-07-09 | 2009-09-08 | Lawrence Livermore National Security, Llc | Method for ultrafast optical deflection enabling optical recording via serrated or graded light illumination |
-
2013
- 2013-03-27 CN CN201310103586.XA patent/CN103196570B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886331A (en) * | 1988-03-17 | 1989-12-12 | Environmental Research Institute Of Michigan | Thermo-optically induced waveguide |
| CN1150479A (en) * | 1995-02-07 | 1997-05-21 | Ldt激光展示技术公司 | Combination splitting device composed of strip waveguides and uses thereof |
| CN1635417A (en) * | 2003-12-25 | 2005-07-06 | 电子科技大学 | An integrated optical M-Z structural module converter |
| CN102353465A (en) * | 2011-09-30 | 2012-02-15 | 湖南大学 | Time pulse width measurement system for ultrashort pulses in different spatial positions and measurement method thereof |
| CN102364396A (en) * | 2011-10-24 | 2012-02-29 | 中国科学院西安光学精密机械研究所 | All-optical solid streak camera |
Non-Patent Citations (1)
| Title |
|---|
| Solid-state ultrafast all-optical streak camera enabling high-dynamic-range picosecond recording;Chris H. Sarantos 等;《OPTICS LETTERS》;20100501;第35卷(第9期);第1389-1390页 * |
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