CN204128693U - A kind of wideband frequency modulation pulse laser Waveform testing device - Google Patents
A kind of wideband frequency modulation pulse laser Waveform testing device Download PDFInfo
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- CN204128693U CN204128693U CN201420652805.XU CN201420652805U CN204128693U CN 204128693 U CN204128693 U CN 204128693U CN 201420652805 U CN201420652805 U CN 201420652805U CN 204128693 U CN204128693 U CN 204128693U
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Abstract
The utility model provides a kind of proving installation of wideband frequency modulation pulse laser waveform.Tested frequency modulation on pulse collimated laser beam is successively through optical attenuator, lens, and the photoinduction face then impinging perpendicularly on photoelectric tube converts electric impulse signal to; Electric impulse signal outputs to the rf inputs of the straight light modulation modulator of based semiconductor laser instrument by cable; Electric impulse signal is modulated into light pulse signal and exports by straight light modulation modulator, and light pulse signal transfers to photodetector through coupling fiber and long-distance optical fiber, and the electric signal that photodetector exports enters oscillograph by cable.The utility model has high reliability, information can be transmitted by long-distance optical fiber, be convenient to utilize optical fibre time division multiplexing transmission technology to realize the integrated of a lot of beam optical path measuring system, effectively can reduce the operating cost of system, be specially adapted to the test of large-scale device of high power laser wideband frequency modulation burst length waveform.
Description
Technical field
The utility model belongs to high-power laser test technical field, is specifically related to a kind of proving installation being applicable to a lot of bundle large-scale device of high power laser wideband frequency modulation pulse laser waveform.
Background technology
In large-scale high-power laser driver, in order to suppress transverse stimulated Brillouin scattering effect and meet the requirement of Smoothing by Spectral Dispersion technology, pulse laser adopts wideband frequency modulation pulse, and its spectral composition is the comb δ function formula of discrete distribution.Impact on the one hand due to various dispersion element in high power laser system, the time response of each local (or point) in space on wideband frequency modulation pulsed light beam cross section is also inconsistent, also there are differences with the time response of unified light beam; On the other hand, due to spectrum relevance when frequency modulation on pulse has very strong, modulating appears in the faint unbalance pulse waveform that will cause of spectral component.Different from wideband frequency modulation pulse, narrow-band impulse due to spectral composition single, on its beam cross section, the time response of each local (or point) in space is consistent, and consistent with the time response of unified light beam.
At present, large-scale device of high power laser exports nanosecond pulsed waveform measuring method two kinds, one method adopts photoelectric tube and high bandwidth digital oscilloscope, this method is when in the face of wideband frequency modulation pulse, unified light beam can be received and obtain waveform, but be limited to the bandwidth sum dispersion that oscillograph passage can only measure single channel light beam and cable, at the same time in the face of multi beam number, during the large scale laser instrument of many diagnostic points, cable transmission is adopted to be unfavorable for long range propagation and the system integration of information, and because needs use multiple stage oscillograph to cause plant running with high costs, another kind method is by sampling by optical fiber and time-multiplexed optical transport technology and realizes the synchronous concentrated measurement of multiple laser pulse waveform in conjunction with ultrafast photoelectric detector and high bandwidth oscilloscope, namely the single passage of oscillograph can measure multichannel light beam simultaneously, this method is beneficial to long range propagation and the system integration of the information of realization, and significantly can reduce the operating cost of laser aid, but this method is when in the face of wideband frequency modulation pulse, because sampling by optical fiber mode is beam cross section local or some sampling, the shape information obtained accurately can not reflect the time response of unified light beam, therefore the range of application of above-mentioned two kinds of nanosecond pulsed waveform measuring methods is restricted.And in the face of device of high power laser wideband frequency modulation pulse waveform is measured, report relevant with it only has the patent of optical fiber and laser coupled sampling aspect, be local or some sampling, have no other report.As bored coupling sampling under light, the Chinese utility model patent (patent No.: ZL200720078801) that name is called " high power laser injection fiber coupling device "; As being coupled under Near-Field Radar Imaging directional light, the Chinese invention patent (patent No.: ZL200910215304.9) that name is called " a kind of fiber-optic coupling method for high-power laser test system ".
Summary of the invention
In order to overcome existing nanosecond pulsed waveform measuring method when the waveform measurement of the wideband frequency modulation pulse laser that a lot of bundle large scale laser instrument exports, can not realize the defect of the measurement of unified beam shape and Chief Information Officer Distance Transmission, the utility model provides a kind of proving installation of wideband frequency modulation pulse laser waveform simultaneously.
The proving installation of wideband frequency modulation pulse laser waveform of the present utility model comprises: tested frequency modulation on pulse collimated laser beam is successively through optical attenuator, lens, and the photoinduction face then impinging perpendicularly on photoelectric tube converts electric impulse signal to; Electric impulse signal outputs to the rf inputs of the straight light modulation modulator of based semiconductor laser instrument by cable; Electric impulse signal is modulated into light pulse signal and exports by straight light modulation modulator, and light pulse signal transfers to photodetector through coupling fiber and long-distance optical fiber, and the electric signal that photodetector exports enters oscillograph by cable.
Photoelectric tube output electric pulse signal power in the proving installation of wideband frequency modulation pulse laser waveform of the present utility model is less than straight light modulation modulator and inputs 1 dB compression point; Straight light modulation modulators modulate band is wider than photoelectric tube responsive bandwidth; Photoelectric tube output impedance and the input impedance of straight light modulation modulator meet matches impedances principle.
The proving installation of wideband frequency modulation pulse laser waveform of the present utility model has high reliability, information can be transmitted by long-distance optical fiber, be convenient to utilize optical fibre time division multiplexing transmission technology to realize the integrated of a lot of beam optical path measuring system, effectively can reduce the operating cost of system, be specially adapted to the test of large-scale device of high power laser wideband frequency modulation burst length waveform.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the proving installation of wideband frequency modulation pulse laser waveform of the present utility model;
In Fig. 1,1. optical attenuator, 2. lens, 3. photoelectric tube, 4. straight light modulation modulator, 5. variable fibre optic attenuator, 6. photodetector, 7. oscillograph.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, but protection domain of the present utility model should not be limited with this.
In Fig. 1, tested high power wideband frequency modulation pulse collimated laser beam is successively through optical attenuator 1, lens 2 are assembled, and unified beam orthogonal is incident and be full of photoelectric tube 3 photoinduction face, output electric pulse inputs to straight light modulation modulator 4 rf inputs as modulation signal by high speed cable, straight light modulation modulator 4 exports narrow-band impulse laser, its waveform is consistent with tested wideband frequency modulation pulse laser waveform, and be transmitted through the fiber to variable fibre optic attenuator 5, after decay, narrow band light pulse inputs to photodetector 6 by optical fiber, output electric pulse signal enters oscillograph 7 by cable again.Straight light modulation modulator 4 inputs modulation signal power and is less than it and inputs 1 dB compression point; Straight light modulation modulator 4 modulation band-width is greater than photoelectric tube 3 responsive bandwidth; Photoelectric tube 3 output terminal impedance and straight light modulation modulator 4 are modulated input impedance and are matched; Variable fibre optic attenuator 5 decay after Output optical power be less than photodetector 6 saturation power; Photodetector 6 output impedance and oscillograph 7 channel impedance match.
Technical solution of the present utility model is based on following principle:
With tested wideband frequency modulation pulse collimated laser beam bore for D=50mm, 1Hz, 1053nm, 3ns square wave; Lens 2 focal length is=300mm; The photoelectric tube 3 photoinduction face bore used is d=10mm, bandwidth: 6G, output impedance:; Straight light modulation modulator 4:DFB laser instrument, output wavelength: 1330nm, modulation band-width >10G, modulation input impedance:; The model of photodetector 6: Newfocus 1554B, bandwidth 12G, CW saturation power: 1mW, output impedance:; Cable bandwidth: 18G; Oscillograph 7 bandwidth: 8G, input impedance:, for example is illustrated.
First, according to tested wideband frequency modulation pulse collimated laser beam bore, lens 2 focal length and the distance h between photoelectric tube 3 photoinduction face caliber size determination lens 2 and photoelectric tube 3 light-sensitive surface;
Incident parallel light bore is D, and lens 2 emergent light arbitrary section bore is:, in order to ensure that unified incident light all enters photoelectric tube 3 photoinduction face, at photoinduction face place, beam cross section bore must meet; On the other hand in order to ensure that incident beam is full of photoelectric tube 3 photoinduction face as much as possible, must close to photoinduction face caliber size at photoinduction face place beam cross section bore, due to d=10mm in this example, when, distance then between lens 2 and photoelectric tube 3 light-sensitive surface is:, therefore.
The maximum amplitude value that point value determines incident light pulse output electric pulse signal after photoelectric tube 3 opto-electronic conversion is compressed according to input 1 dB of straight light modulation modulator 4;
Input 1 dB compression point and be defined as modulator radio-frequency head input peak power.In this example, the input 1 dB compression point value of straight light modulation modulator 4 is: 20dbm, that is, the modulation input impedance faced by, then the range value that the power input of 100mW is corresponding is, therefore, photoelectric tube 3 spiking output range value is 2.24V.
Determine whether add variable fibre optic attenuator 5 between straight light modulation modulator 4 and photodetector 6 according to the Output optical power of straight light modulation modulator 4 and the saturation power of photodetector 6;
In the present embodiment, straight light modulation modulator 4 is under bias current 100mA, and it exports continuous light power >8mW, and under bias current 75mA, it exports continuous light power ~ 4.9mW, and the CW saturation power of photodetector 6 is: 1mW.Therefore variable fibre optic attenuator 5 is added.
According to above analysis, choose the distance h=250mm between lens 2 to photoelectric tube 3 light-sensitive surface, then on light-sensitive surface, spot size is, guarantees that unified light beam enters photoelectric tube 3 and is full of photoinduction face as far as possible; Modulation input impedance and photoelectric tube 3 output impedance of straight light modulation modulator 4 are, and meet impedance matching principle; Photodetector 6 output impedance and the input impedance of oscillograph 7 passage are, and also meet impedance matching principle; Straight light modulation modulator 4 band is wider than photoelectric tube 3 bandwidth.
In the present embodiment, to be decayed multiplying power, make photoelectric tube 3 output electric pulse range value 1.9V by selective light attenuator 1, input 1 dB being less than straight light modulation modulator 4 compresses point value; The bias current of straight light modulation modulator 4 is set to 75mA, variable fibre optic attenuator 5 light output is monitored with light power meter, and regulate variable fibre optic attenuator 5, selecting variable fibre optic attenuator 5 to export continuous light power is 0.75mW, be less than the CW saturation power of photodetector 6, then photodetector 6 exports electric signal and enters oscillograph 7 by cable, and wave-shape amplitude value is 0.93V.
Like this, 1053nm, 3ns incident broad band frequency modulation on pulse waveform, electric range value 1.9V, is undistortedly converted to 1330nm, 3ns narrow-band impulse waveform, and range value is 0.93V.Because optical fiber adopts single-mode fiber, can grow apart from undistorted ground transmitting optical signal, realize long distance far-end measuring.
Therefore, realizing wideband frequency modulation pulses switch by being combined with the directly modulation technology of based semiconductor laser instrument by photoelectric tube is that narrow-band impulse carries out waveform measurement, and utilize optical fiber to carry out Signal transmissions, unified beam shape can be overcome and measure the contradiction with measuring-signal long-distance transmissions, be convenient to a lot of beam optical path of large scale laser instrument and realize synchronously concentrating measuring by time-division multiplex technology.
Attenuator 1 adopts the heat absorbing glass of 1053nm, is furnished with the attenuator of differential declines multiplying power, and each attenuator all independently can pass in and out switching in the optical path; Lens 2 adopt optically transparent material to make; Described lens mirror holder all can horizontal, longitudinally regulate; Photoelectric tube 3 is placed on four-dimensional adjusting bracket, can horizontal stroke, longitudinal direction and angular adjustment.
Claims (4)
1. a wideband frequency modulation pulse laser Waveform testing device, is characterized in that: tested frequency modulation on pulse collimated laser beam is successively through optical attenuator (1), lens (2), and the photoinduction face then impinging perpendicularly on photoelectric tube (3) converts electric impulse signal to; Electric impulse signal outputs to the rf inputs of the straight light modulation modulator (4) of based semiconductor laser instrument by cable; Electric impulse signal is modulated into light pulse signal and exports by straight light modulation modulator (4), and light pulse signal transfers to photodetector (6) through coupling fiber and long-distance optical fiber, and the electric signal that photodetector (6) exports enters oscillograph (7) by cable.
2. wideband frequency modulation pulse laser Waveform testing device according to claim 1, is characterized in that: the electric impulse signal power that described photoelectric tube (3) exports is less than straight light modulation modulator (4) and inputs 1 dB compression point.
3. wideband frequency modulation pulse laser Waveform testing device according to claim 1, is characterized in that: described straight light modulation modulator (4) modulation band-width is greater than photoelectric tube (3) responsive bandwidth.
4. wideband frequency modulation pulse laser Waveform testing device according to claim 1, is characterized in that: (3) output impedance of described photoelectric tube and straight light modulation modulator (4) input impedance meet matches impedances principle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420652805.XU CN204128693U (en) | 2014-11-05 | 2014-11-05 | A kind of wideband frequency modulation pulse laser Waveform testing device |
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| CN201420652805.XU CN204128693U (en) | 2014-11-05 | 2014-11-05 | A kind of wideband frequency modulation pulse laser Waveform testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316205A (en) * | 2014-11-05 | 2015-01-28 | 中国工程物理研究院激光聚变研究中心 | Broadband frequency modulating pulse laser waveform testing device |
| CN112697284A (en) * | 2020-12-08 | 2021-04-23 | 中国人民解放军空军工程大学 | Remote laser light field pulse waveform distribution characteristic measurement system |
-
2014
- 2014-11-05 CN CN201420652805.XU patent/CN204128693U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316205A (en) * | 2014-11-05 | 2015-01-28 | 中国工程物理研究院激光聚变研究中心 | Broadband frequency modulating pulse laser waveform testing device |
| CN112697284A (en) * | 2020-12-08 | 2021-04-23 | 中国人民解放军空军工程大学 | Remote laser light field pulse waveform distribution characteristic measurement system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20191105 |