CN204101448U - A kind of spectrum beam splitting measurement mechanism for Supercontinuum source - Google Patents
A kind of spectrum beam splitting measurement mechanism for Supercontinuum source Download PDFInfo
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- CN204101448U CN204101448U CN201420561904.7U CN201420561904U CN204101448U CN 204101448 U CN204101448 U CN 204101448U CN 201420561904 U CN201420561904 U CN 201420561904U CN 204101448 U CN204101448 U CN 204101448U
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Abstract
A kind of spectrum beam splitting measurement mechanism for Supercontinuum source, use three optical fiber collimators and a long wave pass filter or short wave pass filter, the super continuum light spectrum that Supercontinuum source is exported by tail optical fiber is collimated by an optical fiber collimator, and then be incident on long wave pass filter or short wave pass filter, be divided into long wave and shortwave two parts by long wave pass filter or short wave pass filter transmission or reflection according to the cutoff wavelength of long wave pass filter or short wave pass filter, transmission or the two-way light reflected is each respectively is again coupled in determinand through an optical fiber collimator, adopt two of corresponding range spectrometers to measure the transmitted spectrum of determinand respectively more respectively simultaneously.The utility model achieves and uses grating spectrograph to carry out the seamless measurement of ultra broadband in the whole spectral range of Supercontinuum source simultaneously.Device of the present utility model does not need to regulate light path to change different narrow band pass filters before every measurement, both time saving and energy saving, reduces cost, turn increases stability and the reliability of device.
Description
Technical field
The utility model relates to a kind of spectrum beam splitting measuring method and device.Particularly relate to and a kind ofly utilize bulk optics device super continuum light to be composed length wave component to carry out beam splitting so that carry out the spectrum beam splitting measurement mechanism for Supercontinuum source measured in whole spectral range simultaneously.
Background technology
The transmitting procedure of light pulse in nonlinear medium, not only be subject to the impact of the multiple nonlinear effects such as such as Self-phase modulation (SPM), Cross-phase Modulation (XPM), four-wave mixing (FWM), stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS), be also subject to the impact of Dispersion of Media characteristic.Under the acting in conjunction of nonlinear effect and dispersion, new frequency component is produced.For enough strong pulse, its spectrum can be more than broadened hundreds of nanometer, and this phenomenon is referred to as the generation of super continuum light spectrum.
Supercontinuum source can export ultra-wide spectrum laser, and it to have on the field of high request low-coherence light source or spectral analysis in biology, medical science, physics, national defence and industry etc. and has important application.In spectroscopy applications, because Supercontinuum source can export the pole wide spectral more than an even several octave, thus a Supercontinuum source just can substitute before the narrow-band light source of several different-waveband, enormously simplify the complexity of system source.
But from the viewpoint of spectral measurement, the equipment that present stage mainly uses is grating spectrograph.Relative to the spectral bandwidth of Supercontinuum source, the range of grating spectrograph is very limited, about being generally an octave, such as: the range of two kinds of conventional grating spectrographs is respectively 600-1700nm and 1200-2400nm.Particularly close to 2 micron wavebands of middle infrared, market almost only have range be that this kind of spectrometer of 1200-2400nm is available.
According to grating equation
known, rudimentary diffraction of long wavelength light signal overlaps completely by corresponding senior diffraction of short-wavelength light signal, cannot separate.Such as: wavelength is that the light of 2100nm enters to inject in grating spectrograph, its first-order diffraction can be the second-order diffraction of 1050nm light with wavelength, wavelength be 700nm light three order diffractions and by that analogy more senior the diffraction light of short wavelength overlap completely.Even if the light that its consequence is in fact not 2100nm enters spectrometer and only has the above-mentioned short-wavelength light mentioned to enter into spectrometer, spectrometer also can show and recorded the light signal that wavelength is 2100nm, thus causes measuring error.
Further, existing Supercontinuum source uses the Yb dosed optical fiber mode-locked laser being operated in 1 micron waveband as seed light source mostly, and after amplifying, pumped nonlinear optical fiber produces super continuum light spectrum.The light intensity of the shortwave part that this makes super continuum light compose especially 1 micron waveband is better than long wavelength part.In addition the shortwave part of super continuum light spectrum has been significantly shorter than the short-wavelength limit 1200nm of spectrometer range.Final result is that the long wavelength part of measurement result, especially at 2 micron wavebands, above-mentioned measuring error has been typically further exacerbated under the outrange of 1 stronger micron waveband light signal and spectrometer to use both acting in conjunction.
At present, when applying Supercontinuum source and carrying out spectroscopy applications, the main method solved the problem adopts corresponding narrow band pass filter to leach corresponding spectral component according to the wave band of application.But the inferior position of this method is also apparent.On the one hand, the spectral component be in narrow band pass filter rejection zone will be lost completely, can not apply.This is the significant wastage spectral width of Supercontinuum source not only, also weakens its advantage compared with traditional narrow light source.On the other hand, in order to meet the demand of ultra-wideband detection, such scheme must need several narrow band pass filter, not only increases the cost of device, and each narrow band pass filter of changing all needs to readjust light path, wastes time and energy.
Such as: in the application utilizing Supercontinuum source measuring optical fiber grating, if two fiber gratings having centre wavelength to be respectively 1.5 microns and 2 microns need to measure.Two narrow band pass filters needing reserve centre wavelength to be respectively 1.5 microns and 2 microns according to above-mentioned solution are measured at twice, and each measure before all need to readjust light path.
Summary of the invention
Technical problem to be solved in the utility model is, there is provided a kind of whole wave band of Supercontinuum source that can make full use of to measure in real time, do not need to regulate light path to change different narrow band pass filters before every measurement, and the stability of device and the spectrum beam splitting measurement mechanism for Supercontinuum source of reliability can be increased.
The technical scheme that the utility model adopts is: a kind of spectrum beam splitting measurement mechanism for Supercontinuum source, include the first optical fiber collimator, second optical fiber collimator, 3rd optical fiber collimator and long wave pass filter or short wave pass filter, the light incident side of the first described optical fiber collimator is by Fiber connection Supercontinuum source, described long wave pass filter or short wave pass filter are arranged on the output light path of described first optical fiber collimator, described second optical fiber collimator is arranged on the reflected light path of described long wave pass filter or short wave pass filter, described 3rd optical fiber collimator is arranged on the transmitted light path of described long wave pass filter or short wave pass filter, the light output end of the second described optical fiber collimator connects the first determinand, the light output end of the 3rd described optical fiber collimator connects the second determinand, the light output end of described first determinand connects the first spectrometer, the light output end of described second determinand connects the second spectrometer.
The cutoff wavelength of described long wave pass filter or short wave pass filter is greater than the range short-wavelength limit for the second spectrometer or the first spectrometer of measuring long wavelength part spectrum when using long wave pass filter or short wave pass filter respectively.
A kind of spectrum beam splitting measurement mechanism for Supercontinuum source of the present utility model, not only takes full advantage of the whole spectral bandwidth of Supercontinuum source, makes the spectrum simultaneously measuring different-waveband determinand become possibility; Achieve and use grating spectrograph to carry out the seamless measurement of ultra broadband in the whole spectral range of Supercontinuum source simultaneously.Device of the present utility model is used also not need to regulate light path to change different narrow band pass filters before every measurement, both time saving and energy saving, reduce cost, turn increase stability and the reliability of device.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model;
Fig. 2 is the result that the first testing fiber grating measuring of the first spectrometer to 1.5 micron wavebands obtains;
Fig. 3 is the result that the second testing fiber grating measuring of the second spectrometer to 2 micron wavebands obtains.
In figure
1: the first optical fiber collimator 2: the second optical fiber collimator
3: the three optical fiber collimators 4: long wave pass filter or short wave pass filter
5: the first determinand 6: the second determinands
7: the first spectrometer 8: the second spectrometers
9: Supercontinuum source 10: optical fiber
Embodiment
Below in conjunction with embodiment and accompanying drawing, a kind of spectrum beam splitting measurement mechanism for Supercontinuum source of the present utility model is described in detail.
A kind of spectrum beam splitting measurement mechanism for Supercontinuum source of the present utility model, be divided into length ripple two parts to apply respectively super continuum light spectrum by bulk optics device, can be implemented in the whole spectral range of Supercontinuum source and use grating spectrograph to carry out this target of the seamless measurement of ultra broadband simultaneously.
As shown in Figure 1, a kind of spectrum beam splitting measurement mechanism for Supercontinuum source of the present utility model, include the first optical fiber collimator 1, second optical fiber collimator 2, 3rd optical fiber collimator 3 and long wave pass filter or short wave pass filter 4, the light incident side of the first described optical fiber collimator 1 connects Supercontinuum source 9 by optical fiber 10, described long wave pass filter or short wave pass filter 4 are arranged on the output light path of described first optical fiber collimator 1, and, the output light path of described long wave pass filter or short wave pass filter 4 and the first described optical fiber collimator 1, and the output light path of the reflected light path of long wave pass filter or short wave pass filter 4 and the first described optical fiber collimator 1 to need and filbtercharacteristic can arrange and has a certain degree according to measuring, as the output light path of the first optical fiber collimator with the incident angles of 20 degree on long wave pass filter or short wave pass filter 4, namely the reflected light path of long wave pass filter or short wave pass filter 4 and the output light path of the first described optical fiber collimator 1 are 40 degree of angles.
Described second optical fiber collimator 2 is arranged on the reflected light path of described long wave pass filter or short wave pass filter 4, described 3rd optical fiber collimator 3 is arranged on the transmitted light path of described long wave pass filter or short wave pass filter 4, the light output end of the second described optical fiber collimator 2 connects the first determinand 5, the light output end of the 3rd described optical fiber collimator 3 connects the second determinand 6, the light output end of described first determinand 5 connects the first spectrometer 7, and the light output end of described second determinand 6 connects the second spectrometer 8.The cutoff wavelength of described long wave pass filter or short wave pass filter 4 is greater than the range short-wavelength limit for the second spectrometer 8 or the first spectrometer 7 of measuring long wavelength part spectrum when using long wave pass filter or short wave pass filter 4 respectively.
The Supercontinuum source output spectrum bandwidth that the utility model uses in a particular embodiment is 800-2100nm, collimated light is become through the first reflective optical fiber collimator after super continuum light spectrum is exported by tail optical fiber, and with the incident angles of 20 degree on long wave pass filter.The cutoff wavelength of long wave pass filter is 1700nm, is greater than the short-wavelength limit 1200nm measuring long wavelength part grating spectrograph range used.Like this, the ultra-wide spectrum that Supercontinuum source exports will be that boundary is divided into two bundles with 1700nm, and the part of 800-1700nm will be reflected onto in the second optical fiber collimator, and the part of 1700-2100nm will be transmitted through in the 3rd optical fiber collimator.Two-beam is coupled in optical fiber by the second optical fiber collimator and the 3rd optical fiber collimator respectively, transfers to the first determinand and the second determinand.Finally, measure the transmitted spectrum of the first determinand and the second determinand with two spectrometers that range is 600-1700nm and 1200-2400nm respectively simultaneously, result as shown in Figures 2 and 3 can be obtained respectively.First determinand and the second determinand are respectively the fiber grating of 1.5 microns and 2 micron wavebands, can read the parameters such as centre wavelength, reflectivity and the bandwidth of the two from figure.The first determinand wherein and the second determinand can be the printing opacity objects such as fiber grating, bulk crystals, biological tissue's thin slice.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, above-mentioned the utility model embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (2)
1. the spectrum beam splitting measurement mechanism for Supercontinuum source, include the first optical fiber collimator (1), second optical fiber collimator (2), 3rd optical fiber collimator (3) and long wave pass filter or short wave pass filter (4), it is characterized in that, the light incident side of described the first optical fiber collimator (1) connects Supercontinuum source (9) by optical fiber (10), described long wave pass filter or short wave pass filter (4) are arranged on the output light path of described first optical fiber collimator (1), described second optical fiber collimator (2) is arranged on the reflected light path of described long wave pass filter or short wave pass filter (4), described 3rd optical fiber collimator (3) is arranged on the transmitted light path of described long wave pass filter or short wave pass filter (4), the light output end of described the second optical fiber collimator (2) connects the first determinand (5), the light output end of the 3rd described optical fiber collimator (3) connects the second determinand (6), the light output end of described first determinand (5) connects the first spectrometer (7), the light output end of described second determinand (6) connects the second spectrometer (8).
2. a kind of spectrum beam splitting measurement mechanism for Supercontinuum source according to claim 1, it is characterized in that, the cutoff wavelength of described long wave pass filter or short wave pass filter (4) is greater than the range short-wavelength limit for the second spectrometer (8) or the first spectrometer (7) of measuring long wavelength part spectrum when using long wave pass filter or short wave pass filter (4) respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237141A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Spectral splitting measurement method and device for supercontinuum source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104237141A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Spectral splitting measurement method and device for supercontinuum source |
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