CN104064942A - Dual-repetition-frequency short-pulse laser system - Google Patents
Dual-repetition-frequency short-pulse laser system Download PDFInfo
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- CN104064942A CN104064942A CN201410247146.6A CN201410247146A CN104064942A CN 104064942 A CN104064942 A CN 104064942A CN 201410247146 A CN201410247146 A CN 201410247146A CN 104064942 A CN104064942 A CN 104064942A
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Abstract
The invention discloses a dual-repetition-frequency short-pulse laser system. The system comprises an optical resonant cavity, a dual-refraction device, a pump source, a gain medium, a mode locking device and a coupling output device, wherein two mutually orthogonal polarization principle states are formed by virtue of an optical dual-refraction effect in the dual-refraction device, and the two polarization principle states have different transmission speeds; two short-pulse sequences are formed in the optical resonant cavity, and the polarization states of the two short-pulse sequences are corresponding to the two polarization principle states respectively, thus forming different pulse repetition frequencies.
Description
Technical field
The present invention relates to laser technology field, relate in particular to a kind of dual complex frequency short pulse laser system.
Background technology
Short-pulse laser can be exported the light pulse sequence with a certain fixedly repetition rate conventionally, and its repetition rate is transmitted the needed Time dependent of one-period in optical cavity by light pulse.Constant when the length of optical cavity, the transmission speed of light in optical cavity is fixedly time, and the repetition rate of its fundamental frequency pulse is one and determines and unique value.Two of short-pulse laser outputs of international reports and the method for above repetitive frequency pulsed sequence mainly contain following several at present: 1, in optical cavity, add the device with filter effect, as filter, uneven doped fiber or draw filter difficult to understand etc. due to what Polarization Dependent Loss device caused gains, these filters make laser realize short pulse sequence output in different central wavelength, due to effect of dispersion, the group velocity of different centre wavelength light pulse sequences is different, so repetition rate is different; 2, optical cavity has two or more resonance directions or path, and the repetition rate that institute's output optical pulse sequence is arrived is different.
The present invention proposes to add birefringence device in optical cavity, the light vibrating in optical cavity is repeatedly by birefringence device, optical birefringence effect accumulation in birefringence device forms two mutually orthogonal principal state of polarization (psp), two principal state of polarization (psp) have different transmission speeds, in optical cavity, form respectively corresponding two principal state of polarization (psp) of its polarization state of two short pulse sequences, therefore two short pulse sequences have different repetition rates.Adopting two repetitive frequency lasers of realizing is in this way distinct with adopting the pulse laser of nonlinear polarization rotation locked mode.In the dual complex frequency laser optical resonant cavity of employing nonlinear polarization rotation locked mode, comprise birefringence device (as polarization maintaining optical fibre) and Polarization Dependent Loss device (isolator as relevant in polarization), utilize drawing of its formation filter effect difficult to understand to form dual complex frequency short pulse output.But in the laser system that the present invention proposes, only comprise birefringence device, do not comprise the device of Polarization Dependent Loss, can not form and draw filter effect difficult to understand.
The laser system that two of this outputs have a short pulse sequence of different repetition rates can replace the laser of two complex controls, realizes the systems such as the range measurement of light asynchronous-sampling, pump probe.
Summary of the invention
In one example, described a kind of dual complex frequency short pulse laser system, it is characterized in that, comprise optical cavity, birefringence device, pumping source, gain media, locked mode device and coupling output device, locked mode device makes to produce passive mode locking short pulse sequence in optical cavity; The light vibrating in optical cavity is repeatedly by birefringence device, optical birefringence effect accumulation in birefringence device forms two mutually orthogonal principal state of polarization (psp), two principal state of polarization (psp) have different transmission speeds, respectively corresponding two principal state of polarization (psp) of its polarization state of two short pulse sequences that form in optical cavity, thus different pulse repetition frequencys formed; In optical cavity, do not comprise the device with Polarization Dependent Loss.
In one example, described dual complex frequency short pulse laser system, is characterized in that, optical cavity comprises Linear-Cavity, refrative cavity, annular chamber and figure of eight chamber.
In one example, described dual complex frequency short pulse laser system, it is characterized in that, birefringence device is the optics with birefringence effect, and the size of its double refractive inde has determined the maximum of the difference of two short pulse sequence repetition rates that dual complex frequency short pulse laser system produces.If the chamber in optical cavity is long, be L, refractive index n in chamber, vacuum light speed c, light is l through the path of birefringence device, birefringence △ n, the poor maximum △ f=△ nlc/n of two short pulse sequence repetition rates that can realize
2l
2.
In one example, described dual complex frequency short pulse laser system, it is characterized in that, gain media comprises semiconductor, crystal, rare earth material doped-glass and the rare earth material doped fiber with the level structure matching with pumping source emission spectra, and the device with non-linear Raman scattering effect, non-linear parameter gain.
In one example, described dual complex frequency short pulse laser system, it is characterized in that, locked mode device is semiconductor device, photon crystal device, topological insulator, carbon nano-tube material and the grapheme material that has saturated absorption, realizes passive mode locking.
In one example, described dual complex frequency short pulse laser system, is characterized in that, coupling output device outputs to a part of light of fixed proportion in optical cavity outside optical cavity, in remainder light splitting back light resonant cavity, coupling output device comprises fiber coupler and beam splitter.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is a kind of block diagram of dual complex frequency short pulse laser system, and wherein 1 is pumping source, the 2nd, and gain media, the 3rd, locked mode device, the 4th, birefringence device, the 5th, coupling output device, the 6th, optical cavity;
Fig. 2 is a kind of instance graph of dual complex frequency short pulse laser system;
Fig. 3 is the spectrogram of the short pulse sequence of exported two repetition rates;
Fig. 4 is the spectrogram of the short pulse sequence of exported two repetition rates;
Fig. 5 is the autocorrelator trace of the short pulse sequence of exported two repetition rates;
Embodiment
The system diagram of present embodiment as shown in Figure 2.Wavelength is that the semiconductor laser of 980nm sends pump light, through 980/1550 wavelength division multiplexer, is coupled in 3 meters of long Er-doped fibers.Isolator guarantees the one direction transmission of light.Carbon nano-tube locked mode device has saturated absorption, can realize passive mode locking.Polarization Controller is used for regulating polarisation of light in optical cavity.The polarization maintaining optical fibre of 0.4 meter is birefringence device, when pulse train is transmitted therein, form two mutually orthogonal principal state of polarization (psp), two principal state of polarization (psp) have different transmission speeds, two respectively corresponding two principal state of polarization (psp) of pulse train, form different pulse repetition frequencys.Fiber coupler outputs to 40% light outside optical cavity, and 60% optical coupling enters in optical cavity.The light of exporting enters polarization beam splitter prism after Polarization Controller, is divided into the output light of horizontal polarization direction and vertical polarization.In chamber, the length of monomode fiber is about 8.2 meters.
When pumping light power reaches 20 milliwatt, laser can self mode locking, when pumping light power reaches 30 milliwatt, regulates the polarization state of Polarization Controller in optical cavity can realize two short pulse sequences outputs, when pumping light power is dropped to 24 milliwatt, two short pulse sequences are fundamental frequency.By regulating the Polarization Controller outside chamber, can make output of the horizontal polarization direction along polarization beam splitter prism of two short pulse sequences, along its vertical polarization, export, thereby prove this two short pulse sequence polarized orthogonals for one.Fig. 3, Fig. 4, Fig. 5 are respectively spectrogram, spectrogram and the autocorrelator trace of produced two polarization direction short pulse sequences.As can be seen from Figure 3, the repetition rate of these two short pulse sequences is poor is 86Hz.As can be seen from Figure 4, its spectral width is respectively 2.4nm and 2.2nm.As can be seen from Figure 5, its pulse duration is respectively 1.16ps and 1.27ps (supposing that its pulse shape is hyperbolic secant).If optical cavity inner fiber total length is L, refractive index n, light velocity c, polarization maintaining optical fibre length is l, birefringence △ n, the poor maximum △ f=△ nlc/n of two short pulse sequence repetition rates that can realize
2l
2, be 160Hz as calculated.
The foregoing is only the preferred embodiment of the present invention, but protection range of the present invention is not limited to this.Any those skilled in the art, in technical scope disclosed by the invention, all can carry out suitable change or variation to it, and this change or change and all should be encompassed in protection scope of the present invention within.
Claims (6)
1. this patent has proposed a kind of dual complex frequency short pulse laser system, it is characterized in that, comprise optical cavity, birefringence device, pumping source, gain media, locked mode device and coupling output device, locked mode device makes to produce passive mode locking short pulse sequence in optical cavity; The light vibrating in optical cavity is repeatedly by birefringence device, optical birefringence effect accumulation in birefringence device forms two mutually orthogonal principal state of polarization (psp), two principal state of polarization (psp) have different transmission speeds, respectively corresponding two principal state of polarization (psp) of its polarization state of two short pulse sequences that form in optical cavity, thus different pulse repetition frequencys formed; In optical cavity, do not comprise the device with Polarization Dependent Loss.
2. dual complex frequency short pulse laser system according to claim 1, is characterized in that, optical cavity comprises Linear-Cavity, refrative cavity, annular chamber and figure of eight chamber.
3. dual complex frequency short pulse laser system according to claim 1, it is characterized in that, birefringence device is the optics with birefringence effect, and the size of its double refractive inde has determined the maximum of the difference of two short pulse sequence repetition rates that dual complex frequency short pulse laser system produces.
4. dual complex frequency short pulse laser system according to claim 1, it is characterized in that, gain media comprises semiconductor, crystal, rare earth material doped-glass and the rare earth material doped fiber with the level structure matching with pumping source emission spectra, and the device with non-linear Raman scattering effect, non-linear parameter gain.
5. dual complex frequency short pulse laser system according to claim 1, it is characterized in that, locked mode device is semiconductor device, photon crystal device, topological insulator, carbon nano-tube material and the grapheme material that has saturated absorption, realizes passive mode locking.
6. dual complex frequency short pulse laser system according to claim 1, it is characterized in that, coupling output device outputs to a part of light of fixed proportion in optical cavity outside optical cavity, and in remainder light splitting back light resonant cavity, coupling output device comprises fiber coupler and beam splitter.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107069407A (en) * | 2017-01-16 | 2017-08-18 | 大恒新纪元科技股份有限公司 | The dual complex frequency femto-second laser of cross-polarization |
| CN108736302A (en) * | 2018-07-31 | 2018-11-02 | 中国工程物理研究院激光聚变研究中心 | A kind of off-axis eight journeys laser amplification device and design method based on birefringece crystal |
| CN109792130A (en) * | 2016-09-28 | 2019-05-21 | 弗劳恩霍夫应用研究促进协会 | Short pulse laser system |
| CN110299666A (en) * | 2019-06-11 | 2019-10-01 | 上海交通大学 | A kind of anthropomorphic algorithm for mode locking automatic under a variety of pulse conditions |
| CN114039266A (en) * | 2021-11-05 | 2022-02-11 | 重庆两江卫星移动通信有限公司 | Q-switched fiber laser based on all-fiber structure filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109792130A (en) * | 2016-09-28 | 2019-05-21 | 弗劳恩霍夫应用研究促进协会 | Short pulse laser system |
| CN107069407A (en) * | 2017-01-16 | 2017-08-18 | 大恒新纪元科技股份有限公司 | The dual complex frequency femto-second laser of cross-polarization |
| CN108736302A (en) * | 2018-07-31 | 2018-11-02 | 中国工程物理研究院激光聚变研究中心 | A kind of off-axis eight journeys laser amplification device and design method based on birefringece crystal |
| CN108736302B (en) * | 2018-07-31 | 2023-06-06 | 中国工程物理研究院激光聚变研究中心 | Off-axis eight-pass laser amplification device based on birefringent crystal and design method |
| CN110299666A (en) * | 2019-06-11 | 2019-10-01 | 上海交通大学 | A kind of anthropomorphic algorithm for mode locking automatic under a variety of pulse conditions |
| CN110299666B (en) * | 2019-06-11 | 2020-11-10 | 上海交通大学 | Anthropomorphic method for automatic mode locking under various pulse states |
| CN114039266A (en) * | 2021-11-05 | 2022-02-11 | 重庆两江卫星移动通信有限公司 | Q-switched fiber laser based on all-fiber structure filter |
| CN114039266B (en) * | 2021-11-05 | 2024-03-22 | 重庆两江卫星移动通信有限公司 | Q-switched fiber laser based on all-fiber structure filter |
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| CN104064942B (en) | 2018-03-16 |
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