CN100525104C - Method and system for generating electromagnetic pulse radiation with superwide band ignited by optical fiber laser - Google Patents
Method and system for generating electromagnetic pulse radiation with superwide band ignited by optical fiber laser Download PDFInfo
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- CN100525104C CN100525104C CNB2005100426039A CN200510042603A CN100525104C CN 100525104 C CN100525104 C CN 100525104C CN B2005100426039 A CNB2005100426039 A CN B2005100426039A CN 200510042603 A CN200510042603 A CN 200510042603A CN 100525104 C CN100525104 C CN 100525104C
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Abstract
The invention outputs a light source triggered an ultrashort laser pulse through an ultrashort pulse fiber laser; after amplifying, triggering a light guide switch applied an offset voltage; the offset power pulse is synchronized with the triggering light from the ultrashort pulse fiber laser, and the light guide switch output an ultrashort electric pulse, and sends it to an ultra wideband antenna to convert it from electric energy to electromagnetic energy; the ultra wideband antenna radiates in air and forms an ultra wideband electromagnetic pulse radiation. The invention is easy to produce picoseconds grade high voltage with a hundreds GHz output bandwidth.
Description
Technical field
The invention belongs to the super-broadband electromagnetic impulse radiation technical field, be mainly used in electronic countermeasures and target identification.Be specifically related to a kind of optical-fiber laser and trigger super-broadband electromagnetic impulse radiation formation method and realization system thereof.
Background technology
The ratio that super-broadband electromagnetic impulse typically refers to bandwidth and centre frequency promptly has greater than 25% electromagnetic wave
[(f
h-f
1)/(
fh+f
1)/2]>1/4
In the formula: f
hAnd f
1Represent electromagnetic upper and lower limit frequency respectively.Super-broadband electromagnetic impulse shows as the pulse that rising edge is extremely steep, the duration is extremely short in time domain, generally can reach ps (10
-12S) magnitude; On frequency domain, then has the utmost point broadband that reaches GHz even THz magnitude.Super-broadband electromagnetic impulse has extensive use in a lot of fields, and its special performance will have brought profound influence will for numerous areas such as electronic countermeasures, anti-stealth, ELECTROMAGNETIC WEAPON, penetrability attack weapon fuse, subsurface investigation, communication, medical imaging, industrial automation, Non-Destructive Testing, safety inspection, transportation, material estimation.
The super-broadband electromagnetic impulse technology generally adopts the high-speed switch technology, and high voltage electric energy is converted to radio-frequency electrical energy, obtains supershort electric pulse, by the ultra-wideband antenna spoke, obtains super-broadband electromagnetic impulse.Produce electromagnetic pulse high-speed switch commonly used electron tube switch and gas switch are arranged.The electron tube switch is generally exported at nanosecond order, is difficult to obtain the picosecond pulse.Shortcomings such as gas switch then has poor insulativity, and energy loss is big, and output stability is also relatively poor, and Practical Performance is not good.
Utilizing ultrashort laser pulse to trigger photoconductive switch generation super-broadband electromagnetic impulse is a kind of method of effective acquisition super-broadband electromagnetic impulse.In order to obtain the super-broadband electromagnetic impulse system that pulse duration is a picosecond magnitude in this way, and make output all reach practical requirement aspect repetition rate and the power output, its ultrashort pulse excitation source need satisfy following requirement:
(1) laser pulse width is narrow, below 1ns, preferably reaches ps even fs magnitude;
(2) repetition rate wants high, reach more than the kHz;
(3) have certain output energy, single pulse energy will reach more than the μ J;
(4) wavelength all can from 532nm to 1100nm;
(5) output stability will be got well, and it is high that integrated level is wanted.
At present, satisfying the available laser of above-mentioned requirements has: the laser of neodymium-doped yttrium-aluminum garnet (Nd:YAG), ti sapphire laser, dyestuff locked mode Q-switched laser etc.But the general integrated level of these class lasers is low, and heavy, bulky, mobility is poor, can only be used for the laboratory, poor practicability.
Summary of the invention
The object of the present invention is to provide a kind of formation method and fiber laser of super-broadband electromagnetic impulse radiation to trigger the super-broadband electromagnetic impulse radiation system, it has solved and has been difficult in the background technology obtain picosecond pulse or insulating properties and less stable, or technical problem bulky, the mobility difference.
Technical solution of the present invention is:
A kind of formation method of super-broadband electromagnetic impulse radiation, its special character is: this method may further comprise the steps
1) produce ultrashort laser pulse and trigger light source: the ultrashort laser pulse that produces picosecond or femtosecond pulse duration by ultrashort pulse fiber laser 1 triggers light source;
2) ultrashort laser pulse is amplified to the satisfied energy requirement that triggers: ultrashort laser pulse obtains to satisfy the ultrashort laser pulse of photoconductive switch 4 activation threshold values after fiber amplifier 2 amplifies;
3) trigger the photoconductive switch 4 that is added with bias voltage: the ultrashort laser pulse through amplifying triggers the photoconductive switch 4 that is added with bias voltage; The bias supply pulse of the bias voltage device 3 of generation bias voltage and the triggering phototiming of ultrashort pulse fiber laser 1;
4) photoconductive switch 4 output supershort electric pulses;
5) supershort electric pulse is converted to ultrashort electromagnetic pulse: supershort electric pulse is delivered to ultra-wideband antenna 5 and is converted to super-broadband electromagnetic impulse;
6) form super-broadband electromagnetic impulse radiation: ultra-wideband antenna 5 forms super-broadband electromagnetic impulse radiation in space radiation.
Above-mentioned photoconductive switch 4 added bias voltages can be DC power supply or high-voltage pulse power source.
The pulsewidth of above-mentioned high-voltage pulse power source can be the microsecond magnitude to the millisecond magnitude.
A kind of realization fiber laser triggers the super-broadband electromagnetic impulse radiation system, comprise ultrashort pulse fiber laser 1, its special character is: the output of described ultrashort pulse fiber laser 1 is connected to fiber amplifier 2 through optical fiber, the output of described fiber amplifier 2 is coupled to photoconductive switch 4 through optical fiber, described photoconductive switch 4 is connected with bias voltage device 3, and the output of described photoconductive switch 4 connects ultra-wideband antenna 5.
Above-mentioned ultrashort pulse fiber laser 1 is good with the Yb dosed optical fiber femto-second laser that adopts annular chamber or " 8 " word cavity configuration.
Above-mentioned fiber amplifier 2 is good to adopt double-cladding fiber amplifier.
Above-mentioned photoconductive switch 4 is good to adopt body shape photoconductive switch.
The bias supply of above-mentioned bias voltage device 3 can adopt DC power supply;
When the bias supply of above-mentioned bias voltage device 3 adopted high-voltage pulse power source, described bias voltage device 3 all was connected with sync control device 6 with ultrashort pulse fiber laser 1.
The present invention has the following advantages:
1. utilize ultrashort laser pulse to trigger photoconductive switch and produce super-broadband electromagnetic impulse, can satisfy the index requests such as coupling, system dimension of whole system bandwidth, antenna and switch.Have output high conformity, advantage that output jitter is little simultaneously, be easy to realize the array radiating system.
2. the employing photoconductive switch is easy to produce the picosecond high electric field pulse.
3. because the electrical pulse time that photoconductive switch produced shake is little, be about several psecs, wobble variation is very little for the electric pulse of hundred picosecond pulsewidths.Because different photoconductive switchs has good output consistency, therefore after photoconductive switch is made array, just can control the coherence of output electric pulse indirectly by the phase place of controlling each switch triggering light pulse again.This may for relevant synthetic the providing of realizing a plurality of electromagnetic pulses.
4. adopt fiber-optical ultrashort pulse laser to trigger light source as photoconductive switch.Femtosecond Yb dosed optical fiber oscillator output is carried out power amplification with the double clad ytterbium doped optical fiber amplifier, make light energy output reach the requirement of photoconductive switch triggering energy, can carry out work with interface sites and triggering mode flexibly, volume is little, integrated degree of changing into height.
5. the present invention can realize all solid state ultra broadband electromagnetic radiation system, produces super-broadband electromagnetic impulse, can be applicable to fields such as electronic countermeasures, ULTRA-WIDEBAND RADAR target acquisition.
6. Shu Chu electromagnetic pulse bandwidth, its frequency band can reach hundred GHz to THz scopes.
7. use the full-optical-fiber laser structure, working stability is reliable, need not debug, and thermal diffusivity is good.
8. entire system of the present invention is simple and compact for structure, is easy to integratedly, helps realizing miniaturization, the easy of super-broadband electromagnetic impulse radiation system.
9. the electromagnetic pulse of institute of the system radiation of the present invention's development will have slow attenuation characteristic, can be with the form of three-dimensional pulse structure, similar orphan equally propagates concentration of energy forward at the space regional area and in the decay mode slower than inverse square law, thereby can realize remote transmission.
Description of drawings
Accompanying drawing is a structural representation of the present invention.
Drawing reference numeral explanation: 1-ultrashort pulse fiber laser, 2-fiber amplifier, 3-bias voltage device, 4-photoconductive switch, 4,5-ultra-wideband antenna, 6-sync control device.
Embodiment
The photoconductive switch (being called for short PCSS) that adopts ultrashort laser pulse to trigger is very effective super-broadband electromagnetic impulse source, it is little, in light weight that it has a volume, advantages such as high radiant power, and easy of integration for switch arrays are used as the great-power electromagnetic radiation source, this is extremely useful at the solid-state super-broadband electromagnetic impulse source side of development high power face.
The operation principle of photoconductive switch mainly is to utilize the photoconductive effect of semi-conducting material.Utilize ultrashort laser pulse to trigger the photoconductive switch that applies bias voltage, make material internal produce non equilibrium carrier, increase the conductivity of semi-conducting material in moment; Switch closure after light disappears, photo-generated carrier is very fast by compound, and then photoconductive switch will be exported supershort electric pulse.The amplitude of electric pulse is relevant with added bias voltage and light intensity, and the width of pulse is then similar to the light pulse that triggers.When triggering photoconductive switch with nanosecond, picosecond laser respectively, its output also will then produce super-broadband electromagnetic impulse by ultra-wideband antenna for the electric pulse of nanosecond and psec width, and frequency band corresponding can reach GHz even arrive the THz magnitude.
It is ultrashort pulse fiber laser that the present invention triggers the laser that photoconductive switch adopts, characteristics such as volume is little, integrated level height that it has.The femtosecond Yb dosed optical fiber oscillator of developing at present, the laser pulse wavelength of output are near the 1050-1064nm, and about pulse duration 200 psecs, repetition rate reaches 20MHz, and output stability is good.For, the double clad ytterbium doped optical fiber amplifier is set, pulse energy can be amplified to μ J magnitude.
Referring to accompanying drawing, performing step of the present invention is as follows:
1. produce and trigger light source: adopt the ultrashort laser pulse of ultrashort pulse fiber laser 1 output picosecond or femtosecond pulse duration to trigger light source.Ultrashort pulse fiber laser 1 can adopt the Yb dosed optical fiber femto-second laser of annular chamber or " 8 " word cavity configuration.
2. ultrashort laser pulse is amplified to satisfy and triggers energy requirement: ultrashort laser pulse is connected to fiber amplifier 2 by optical fiber, obtains to satisfy the ultrashort laser pulse of photoconductive switch 4 activation threshold values after amplifying.Fiber amplifier 2 can adopt double-cladding fiber amplifier 2.
3. the ultrashort laser pulse through amplifying triggers the photoconductive switch 4 that is added with bias voltage: photoconductive switch 4 is added with bias voltage device 3, and the ultrashort laser pulse through amplifying is by Optical Fiber Transmission and be coupled to photoconductive switch 4, triggers the photoconductive switch 4 that is added with bias voltage.Photoconductive switch 4 can adopt body shape (Bulk) photoconductive switch, to obtain higher peak power.The voltage endurance of body shape photoconductive switch is good, and the output peak power of single switch can reach the MW level.The bias supply of photoconductive switch 4 is a bias voltage device 3, generally adopts DC power supply.If need higher peak power, then can adopt high-voltage pulse power source, be the bias supply pulse of guaranteeing bias voltage device 3 and the triggering phototiming of ultrashort pulse fiber laser 1, bias voltage device 3 all is connected with sync control device 6 with ultrashort pulse fiber laser 1.The pulsewidth of high-voltage pulse can be from the microsecond magnitude to the millisecond magnitude, and it can satisfy the electromagnetic pulse that produces the psec width fully.
4. photoconductive switch 4 is exported supershort electric pulses;
5. supershort electric pulse is converted to ultrashort electromagnetic pulse: supershort electric pulse is delivered to ultra-wideband antenna 5, and ultra-wideband antenna 5 converts electrical energy into electromagnetic energy.
6. formation super-broadband electromagnetic impulse radiation: ultra-wideband antenna 5 forms super-broadband electromagnetic impulse radiation in space radiation.
Claims (8)
1. the formation method of a super-broadband electromagnetic impulse radiation, it is characterized in that: this method may further comprise the steps
1) produce ultrashort laser pulse and trigger light source: the ultrashort laser pulse that produces picosecond or femtosecond pulse duration by ultrashort pulse fiber laser (1) triggers light source;
2) ultrashort laser pulse is amplified to the satisfied energy requirement that triggers: ultrashort laser pulse obtains to satisfy the ultrashort laser pulse of photoconductive switch (4) activation threshold value after fiber amplifier (2) amplifies;
3) trigger the photoconductive switch (4) that is added with bias voltage: the ultrashort laser pulse through amplifying triggers the photoconductive switch (4) that is added with bias voltage; The bias supply pulse of the bias voltage device (3) of generation bias voltage and the triggering phototiming of ultrashort pulse fiber laser (1);
4) photoconductive switch (4) output supershort electric pulse;
5) supershort electric pulse is converted to ultrashort electromagnetic pulse: supershort electric pulse is delivered to ultra-wideband antenna (5) and is converted to super-broadband electromagnetic impulse;
6) form super-broadband electromagnetic impulse radiation: ultra-wideband antenna (5) forms super-broadband electromagnetic impulse radiation in space radiation.
2. the formation method of super-broadband electromagnetic impulse radiation according to claim 1, it is characterized in that: the added bias voltage of described photoconductive switch (4) is DC power supply or high-voltage pulse power source.
3. the formation method of super-broadband electromagnetic impulse radiation according to claim 1 and 2 is characterized in that: the pulsewidth of described high-voltage pulse power source is that the microsecond magnitude is to a millisecond magnitude.
4. a fiber laser of realizing the described method of claim 1 triggers the super-broadband electromagnetic impulse radiation system, comprise ultrashort pulse fiber laser (1), it is characterized in that: the output of described ultrashort pulse fiber laser (1) is connected to fiber amplifier (2) through optical fiber, the output of described fiber amplifier (2) is coupled to photoconductive switch (4) through optical fiber, described photoconductive switch (4) is connected with bias voltage device (3), and the output of described photoconductive switch (4) connects ultra-wideband antenna (5).
5. fiber laser according to claim 4 triggers the super-broadband electromagnetic impulse radiation system, it is characterized in that: described ultrashort pulse fiber laser (1) is the Yb dosed optical fiber femto-second laser of annular chamber or " 8 " word cavity configuration.
6. trigger the super-broadband electromagnetic impulse radiation system according to claim 4 or 5 described fiber lasers, it is characterized in that: described fiber amplifier (2) is a double-cladding fiber amplifier.
7. fiber laser according to claim 6 triggers the super-broadband electromagnetic impulse radiation system, and it is characterized in that: described photoconductive switch (4) is a body shape photoconductive switch.
8. fiber laser according to claim 7 triggers the super-broadband electromagnetic impulse radiation system, and it is characterized in that: the bias supply of described bias voltage device (3) is a DC power supply; Or the bias supply of described bias voltage device (3) is high-voltage pulse power source, and described bias voltage device (3) all is connected with sync control device (6) with ultrashort pulse fiber laser (1).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100561866C (en) * | 2006-12-30 | 2009-11-18 | 中国科学院电工研究所 | Multi-channel laser-triggered vacuum edge flashing switch |
| CN103219968B (en) * | 2013-03-21 | 2016-06-22 | 电子科技大学 | A kind of high-power ultra-wideband signal generation device |
| CN104008292B (en) * | 2014-05-28 | 2017-03-08 | 中国舰船研究设计中心 | Broad-band antenna super-broadband electromagnetic impulse response prediction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0143446A2 (en) * | 1983-11-24 | 1985-06-05 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Device for the production of short, high intensity electromagnetic radiation pulses in the wavelength region under 100 nm |
| RU2175154C2 (en) * | 1999-11-15 | 2001-10-20 | Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики | Electromagnetic pulse generator |
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2005
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0143446A2 (en) * | 1983-11-24 | 1985-06-05 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Device for the production of short, high intensity electromagnetic radiation pulses in the wavelength region under 100 nm |
| RU2175154C2 (en) * | 1999-11-15 | 2001-10-20 | Российский Федеральный Ядерный Центр - Всероссийский Научно-Исследовательский Институт Экспериментальной Физики | Electromagnetic pulse generator |
Non-Patent Citations (2)
| Title |
|---|
| THz射线产生技术及应用最新进展. 赵尚弘，陈国夫，赵卫，王屹山，于连君.激光技术，第24卷第6期. 2000 * |
| Ultra-Wideband Electromagnetic Radiation from GaAsPhotoconductive Switches. 施卫，贾婉丽，纪卫莉.半导体学报，第26卷第1期. 2005 * |
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Effective date of registration: 20160118 Address after: 710000 Shaanxi province high tech Zone, the new industrial park, West Avenue, building No. 204, arc room, room 60, No. Patentee after: Shaanxi optoelectronic integrated circuit pilot Technology Research Institute Co.,Ltd. Address before: 710000, 323 floor, 17 floor, information tower, new industrial park, hi tech Zone, Shaanxi, Xi'an, three Patentee before: XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICSOF CAS Effective date of registration: 20160118 Address after: 710000, 323 floor, 17 floor, information tower, new industrial park, hi tech Zone, Shaanxi, Xi'an, three Patentee after: XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICSOF CAS Address before: 710068 No. 234 Youyi West Road, Shaanxi, Xi'an Patentee before: XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICS, CHINESE ACADEMY OF SCIENCES |
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