CN114284852B - Wide-spectrum low-coherence light source device with arbitrary time shaping capability - Google Patents
Wide-spectrum low-coherence light source device with arbitrary time shaping capability Download PDFInfo
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- CN114284852B CN114284852B CN202111454877.4A CN202111454877A CN114284852B CN 114284852 B CN114284852 B CN 114284852B CN 202111454877 A CN202111454877 A CN 202111454877A CN 114284852 B CN114284852 B CN 114284852B
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- 238000007493 shaping process Methods 0.000 title claims abstract description 49
- 238000001228 spectrum Methods 0.000 title claims abstract description 34
- 239000013078 crystal Substances 0.000 claims abstract description 19
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 3
- 230000008878 coupling Effects 0.000 claims description 2
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- 238000001514 detection method Methods 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 4
- 230000003595 spectral effect Effects 0.000 description 6
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- 239000006096 absorbing agent Substances 0.000 description 1
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A wide-spectrum low-coherence light source with arbitrary time shaping capability comprises a pumping source, a wide spectrum to be shaped, an input collimator, a parametric crystal, a small hole and an output collimator; the pump source is a light source system with arbitrary time shaping capability, and the output of the pump source is incident to the parametric crystal; the wide spectrum to be shaped is used as signal light to be incident into the parametric crystal after passing through the collimator, and the optical parametric amplification process is carried out under the action of the pumping light, and the arbitrary time shaping of the wide spectrum low coherence continuous light source is realized through the time waveform control of the pumping light. In the optical parametric amplification process, the gain in the optical coupling process of the pump light and the signal is related to the pump light intensity, so that the time waveform distribution of the signal is determined by the pump light intensity distribution by performing time waveform shaping on the pump light and the unsaturated signal, namely, performing time waveform shaping on the signal, and outputting a broad spectrum shaping pulse after passing through the output collimator in the duration of the pump light.
Description
Technical Field
The invention belongs to the field of high-power laser and optical communication, and particularly relates to a wide-spectrum low-coherence light source device with arbitrary time shaping capability.
Background
The existing time shaping of the broad spectrum low coherence light encounters the problems of high frequency modulation in the time domain caused by spectral component deficiency or Fabry-Perot (FP) filter effect and the like. Since the broadband low-coherence light source has the main advantage of having time low-coherence characteristics, the influence of the shaping process on the time coherence of the light source must be considered, so that the low-coherence characteristics of the light source are ensured not to be excessively reduced or even eliminated due to shaping, and meanwhile, the time domain waveform obtained by shaping is ensured to be smooth.
The current mature arbitrary time shaping scheme is to use an electro-optic modulator for shaping, such as a pockels cell electro-optic modulation, mach-zehnder (MZ) interferometric electro-opticModulation, etc., the principle of which is diffraction or interference of light. Because diffraction or interference effects are related to wavelengths, the shaping process can cause the loss of spectral components of a broad spectrum, and the better time domain shaping of the broadband light source cannot be ensured. The method based on the saturable absorber disclosed in the patent publication No. CN 109149347B can realize the time shaping without spectral loss, and has low pulse contrast and large DC back due to the limited depth of the modulator of the saturable absorbing materialResulting in a poor signal-to-noise ratio.
In contrast, based on the parametric amplification process, the pump light which can be flexibly shaped is utilized to be incident on the parametric crystal together with the wide spectrum, and compared with the traditional electro-optic modulation, the invention can avoid spectrum deletion; compared with the saturable absorption scheme, the high-contrast time shaping and good signal to noise ratio can be obtained because of the high gain, and meanwhile, the output energy is greatly improved.
Disclosure of Invention
The invention aims to solve the problem of time domain high-frequency modulation caused by spectral component deficiency or FP filtering effect and the like in the conventional wide-spectrum time shaping, and provides a wide-spectrum low-coherence light source device with arbitrary time shaping capability.
The technical device of the device is as follows:
the wide-spectrum low-coherence light source device with arbitrary time shaping capability is characterized by comprising a pumping source, an input collimator and a parametric crystal; the pump light output by the pump source is incident on the parametric crystal to form a pump light spot; the broad spectrum to be shaped is collimated by the input collimator and then is incident on the parametric crystal to form a broad spectrum light spot, the broad spectrum light spot is overlapped with the pumping light spot, the broad spectrum acts on the parametric crystal and then outputs a broad spectrum shaping pulse beam, and the pumping light amplifies the broad spectrum signal light with corresponding frequency and generates idler frequency light and then outputs a broad spectrum shaping pulse beam.
Further, the device also comprises a small hole and an output collimator, and the broad spectrum shaping pulse beam is coupled and output through the small hole and the output collimator in sequence.
The diameter of the small hole is larger than the diameter of the collimated broad spectrum beam.
The small hole can avoid the interference of pump light and idler frequency light, and the broad-spectrum shaping pulse light beam is coupled and output through the small hole and the output collimator in sequence.
The pump source is a light source system with flexible time domain waveform regulation and control capability, and the output pump light accords with phase matching with a wide spectrum to be shaped.
The broad spectrum to be shaped is output by a broad spectrum source with the bandwidth of hundred nanometers.
The working process of the wide-spectrum low-coherence light source device with arbitrary time shaping capability is as follows:
the pump source and the broad spectrum of the collimator are irradiated on the reference crystal together to act, the pump light can amplify the broad spectrum signal light with corresponding frequency and generate idler frequency light, the action is carried out for time shaping, and the collimator receives the broad spectrum shaping pulse through the small hole.
Compared with the prior art, the invention has the following beneficial effects:
the method solves the problem of high-frequency modulation in a time domain caused by spectral component deficiency or FP filtering effect and the like in the conventional wide-spectrum time shaping, can obtain a wide spectrum output by arbitrary time shaping, can avoid spectral deficiency in the parametric amplification process, can realize arbitrary time shaping of the wide spectrum by adjusting the time waveform of the pumping light, and can obtain the wide spectrum output by large-contrast time shaping and has better signal to noise ratio.
Drawings
FIG. 1 is a schematic diagram of a wide spectrum low coherence light source device with arbitrary time shaping capability
FIG. 2 is a schematic diagram showing the light intensity distribution of the input pumping light and seed light and the amplified signal light
Detailed description of the preferred embodiments
The invention is described below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a schematic structural diagram of a broad spectrum low coherence light source device with arbitrary time shaping capability according to the present invention, and as can be seen from the figure, the broad spectrum low coherence light source device with arbitrary time shaping capability according to the present invention includes a pump source 1, a broad spectrum light to be shaped 2, an input collimator 3, a parametric crystal 4, an aperture 5 and an output collimator 6; the pump light output by the pump source 1 is incident on the parametric crystal 4 to form a pump light spot; the wide spectrum to be shaped (2 is collimated by the input collimator 3 and then is incident on the parametric crystal 4 to form a wide spectrum light spot, the wide spectrum light spot is overlapped with the pump light spot, the wide spectrum acts on the parametric crystal 4 to perform time shaping with the pump light, the pump light amplifies the wide spectrum signal light with corresponding frequency and generates idler frequency light, then a wide spectrum shaping pulse beam is output, the small hole 5 can avoid the interference of the pump light and the idler frequency light, and the wide spectrum shaping pulse beam is sequentially coupled and output by the small hole 5 and the output collimator 6.
The pump source 1 is a light source system with flexible time domain waveform regulation and control capability, and the output pump light accords with phase matching with a wide spectrum to be shaped.
The wide spectrum 2 to be shaped is output by a wide spectrum source system with the bandwidth of hundred nanometers.
The diameter of the aperture 5 is larger than the diameter of the collimated broad spectrum beam.
Examples
In this embodiment, the pump source 1 is a single-frequency narrowband laser with a central wavelength of 526.5nm and an energy of 82.4mJ, and the pump source 1 uses an electro-optical modulator in combination with an arbitrary waveform generator to perform time domain modulation on continuous laser, so that the pump source has high-precision time domain waveform control capability, and the control precision can reach 40ps. The pump source outputs trapezoidal pulses with the pulse width of 9ns and the front low and the back high respectively.
The center wavelength of the wide spectrum 2 to be shaped is 1053nm, and the energy is 1 x 10 -6 J, square wave signal with 9ns pulse width.
The input collimator 3 is provided with a tail fiber, and the bottom width of an output light spot after collimation is about 300 mu m;
the parametric crystal 4 is exemplified by an LBO crystal.
The small hole 5 is used for preventing reflected pump light and idle frequency light generated in the parametric process from interfering a detection result;
the output collimator 6 is matched with the input collimator 3, so that the coupling receiving of the output light is realized. Fig. 2 is a graph of pump light, input light, and output normalized waveform light, and the result shows that by adjusting the time waveform of the pump light, arbitrary time shaping of a broad spectrum can be achieved, a broad spectrum of a large-contrast time shaped output is obtained, and a better signal-to-noise ratio is achieved.
Claims (7)
1. The wide-spectrum low-coherence light source device with arbitrary time shaping capability is characterized by comprising a pumping source (1), an input collimator (3) and a parametric crystal (4); the pump light output by the pump source (1) is incident on the parametric crystal (4) to form a pump light spot; the broad spectrum (2) to be shaped is collimated by the input collimator (3) and then is incident on the parametric crystal (4) to form a broad spectrum light spot, the broad spectrum light spot is overlapped with the pumping light spot, the broad spectrum acts on the parametric crystal (4) and performs time shaping with the pumping light, and the pumping light amplifies the broad spectrum with corresponding frequency and generates idler frequency light and then outputs a broad spectrum shaping pulse beam.
2. The broad spectrum low coherence light source device with arbitrary time shaping capability according to claim 1, further comprising an aperture (5) and an output collimator (6), wherein the broad spectrum shaped pulse beam is coupled out sequentially through the aperture (5) and the output collimator (6).
3. The broad spectrum low coherence light source device with arbitrary time shaping capability according to claim 2, wherein the output collimator (6) is matched with the input collimator (3) to realize coupling receiving of output light.
4. The broad spectrum low coherence light source device with arbitrary time shaping capability according to claim 2, wherein: the small hole (5) is used for preventing reflected pump light and idle frequency light generated by a parametric process from interfering a detection result.
5. The broad spectrum low coherence light source device with arbitrary time shaping capability according to claim 2 or 4, characterized in that: the diameter of the small hole (5) is larger than that of the collimated broad spectrum beam.
6. The broad spectrum low coherence light source device with arbitrary time shaping capability according to any one of claims 1-4, wherein: the pump source (1) is a light source with flexible time domain waveform regulation capability, and the output pump light accords with phase matching with a wide spectrum to be shaped.
7. The broad spectrum low coherence light source device with arbitrary time shaping capability according to any one of claims 1-4, wherein: the wide spectrum (2) to be shaped is output by a wide spectrum source with the bandwidth of hundred nanometers.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2376412A1 (en) * | 1999-06-15 | 2000-12-21 | Commissariat A L'energie Atomique | Method and device for programmable shaping of a time profile for quasi-monochromatic optical pulses |
| CN106654841A (en) * | 2016-12-24 | 2017-05-10 | 天津大学 | Light-light synchronous amplification-based time domain shaping method and device |
| WO2017160653A1 (en) * | 2016-03-14 | 2017-09-21 | Lawrence Livermore National Security, Llc | Arbitrary pulse shaping with picosecond resolution over multiple-nanosecond records |
| CN107394574A (en) * | 2017-06-28 | 2017-11-24 | 天津大学 | Light phototiming amplification suppresses spectral red shift light spectrum reshaping method and device |
| CN108281877A (en) * | 2018-03-14 | 2018-07-13 | 成都师范学院 | Chirped laser pulse frequency spectrum shaping system based on spectrum angle dispersion |
| CN109149347A (en) * | 2018-09-11 | 2019-01-04 | 中国科学院上海光学精密机械研究所 | Wide range optical time domain apparatus for shaping |
| CN109802294A (en) * | 2019-03-25 | 2019-05-24 | 中国工程物理研究院上海激光等离子体研究所 | A kind of Low coherence pulse generating device of any time shaping and light spectrum reshaping |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017107073A (en) * | 2015-12-10 | 2017-06-15 | キヤノン株式会社 | Light source device and information acquisition device using the same |
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- 2021-12-01 CN CN202111454877.4A patent/CN114284852B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2376412A1 (en) * | 1999-06-15 | 2000-12-21 | Commissariat A L'energie Atomique | Method and device for programmable shaping of a time profile for quasi-monochromatic optical pulses |
| WO2017160653A1 (en) * | 2016-03-14 | 2017-09-21 | Lawrence Livermore National Security, Llc | Arbitrary pulse shaping with picosecond resolution over multiple-nanosecond records |
| CN106654841A (en) * | 2016-12-24 | 2017-05-10 | 天津大学 | Light-light synchronous amplification-based time domain shaping method and device |
| CN107394574A (en) * | 2017-06-28 | 2017-11-24 | 天津大学 | Light phototiming amplification suppresses spectral red shift light spectrum reshaping method and device |
| CN108281877A (en) * | 2018-03-14 | 2018-07-13 | 成都师范学院 | Chirped laser pulse frequency spectrum shaping system based on spectrum angle dispersion |
| CN109149347A (en) * | 2018-09-11 | 2019-01-04 | 中国科学院上海光学精密机械研究所 | Wide range optical time domain apparatus for shaping |
| CN109802294A (en) * | 2019-03-25 | 2019-05-24 | 中国工程物理研究院上海激光等离子体研究所 | A kind of Low coherence pulse generating device of any time shaping and light spectrum reshaping |
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