CN104570327B - A kind of light filter of multi-strobe pattern high light beam quality - Google Patents

Abstract

The present invention provides an optical filter with multiple gating modes and high beam quality, comprising: a first dispersive element, used to diverge the initial beam into a divergent beam, and used to restore the gating beam; a second dispersive element, used to transform the converging the diverging beams into parallel beams and converging the gating beams; the filter element is used for gating the beams of required wavelengths for the parallel beams from the second dispersive element to obtain the gating beams, and The gating light beam is reflected to the second dispersive element; the controller is used to control the filter element to gating the light beam with the required wavelength; and the beam entrance and exit is used to control the initial light beam to enter the first The dispersive element and the gating beam used to control the restoration of the first dispersive element are output to the outside of the filter. The optical filter of the invention can perform second-order dispersion compensation, has four gating modes of long-pass, short-pass, band-pass and band-stop, and the wavelength is adjustable.

Description

A High Beam Quality Optical Filter with Multiple Gate Modes

technical field

The invention belongs to the field of optical spectrum control, measurement and analysis, and the field of optical fiber components, and relates to the fields of light beam filtering, light splitting, second-order dispersion compensation, etc., and in particular to a multi-selection mode high-beam quality optical filter.

Background technique

At present, the filter elements used in biochemical spectral analysis are mainly optical filters and monochromators, each of which has its own limitations. For optical filters, the wavelength selection of ordinary optical filters cannot be adjusted, and it is difficult to control the spectrum; in spectral analysis, it is necessary to prepare a variety of required optical filters, and frequent replacement of optical filters also increases the burden on spectral analysis. workload. Secondly; when the energy of the light source is strong, the filter is easily damaged or the use time is greatly reduced.

For a monochromator, its exit is a slit, which means that only band-pass light can be obtained, and long-pass or short-pass light cannot be obtained. Second, if the energy of the signal light is strong, the contrast of the light obtained by the monochromator will be low. In the rapid measurement of weak light signals, the photosensitive area of the detector is usually very small. For example, the radius of the photosensitive area of an avalanche photodiode (APD) is only tens of microns or even smaller. The commonly used monochromatic processed light is emitted by the slit , forming striped light spots, it is difficult to focus into a small light spot, which increases the difficulty of fast measurement in low light. In addition, it is difficult for the striped light spots emitted by the monochromator to be coupled into the optical fiber, which reduces the propagation efficiency of the beam.

In addition, the above-mentioned optical filter and monochromator will also cause the dispersion of the pulsed light to widen the pulse width.

Therefore, there is an urgent need for an optical filter device that is easy to focus, easy to control the spectrum, has high beam quality, and can perform dispersion compensation.

Contents of the invention

The purpose of the present invention is to provide a high beam quality for spectrum control, measurement and analysis, which can perform second-order dispersion compensation, has four gating modes of long pass, short pass, band pass and band stop, and has adjustable wavelength filtering The device can be widely used in signal detection and signal analysis in the field of biological and chemical analysis.

The optical filter with multi-gate mode and high beam quality of the present invention includes: a first dispersive element, used to diverge the initial beam into a divergent beam, and used to restore the gated beam; a second dispersive element, used to diverge the divergent beam converging the light beams into parallel light beams and converging the gating light beams; the filter element is used for gating the light beams of required wavelengths to obtain the gating light beams for the parallel light beams from the second dispersion element, and the The gating light beam is reflected to the second dispersive element; the controller is used to control the filter element to strobe the light beam with the required wavelength; and the beam inlet and outlet is used to control the initial light beam to enter the first dispersive element , and the gate light beam used to control the reduction of the first dispersive element is output to the outside of the filter.

Preferably, the first dispersion element and the second dispersion element constitute a dispersion element pair, and the dispersion element pair is a pair of isosceles prisms or a pair of gratings.

Preferably, the base angle of the isosceles prism is a Brewster's angle suitable for the gating wavelength, and is suitable for the initial beam is linearly polarized light.

Preferably, the size of the base angle of the isosceles prism is Brewster's angle suitable for the selected wavelength and the surface is coated with an anti-reflection coating suitable for the wavelength, which is suitable for the initial beam is non-linearly polarized light.

Preferably, the filter element may be a light baffle modulator and a reflector, a transmissive spatial light modulator and a reflector, or a reflective spatial light modulator.

Preferably, the controller is used to control the wavelength of the light beam selected by the filter element.

Preferably, the light baffle modulator includes a first light baffle, a second light baffle, a first translation stage, a first rotation stage, and a second translation stage. The first light baffle is fixed on the first translation platform and can move horizontally in the direction perpendicular to the light beam; the second light baffle is fixed on the first rotating platform and can rotate on the horizontal plane; A translation platform and the first rotation platform are fixed on the second translation platform, and can move horizontally perpendicular to the beam direction.

Preferably, if the filter element is a transmissive spatial light modulator or a reflective spatial light modulator, the controller is used to control the spatial distribution of transmittance and reflectance of the spatial light modulator.

Preferably, the replaceable entrances and exits include a spatial light diaphragm type and a fiber optic coupling interface type, including a spatial light entrance diaphragm, an exit diaphragm, and a fiber optic light entrance coupling interface, and the exit coupling interface can be switched at will as required.

Compared with the existing filter device, the present invention has the following advantages:

1. The present invention adopts the dispersion element pair, and the resolution can be adjusted by adjusting the distance of the dispersion element pair, and the second-order dispersion compensation can be performed on the initial beam by changing the insertion amount of the dispersion element or adjusting the incident angle of the initial light, so as to reduce the intensity of the initial beam pulse width;

2. The present invention has four wavelength gating modes, which are easy to control the spectrum, and can be freely switched among the four gating modes of long pass, short pass, band pass and band stop, avoiding frequent replacement of filters in spectral measurement and analysis piece;

3. The present invention can be used for light filtering of high-power light sources, which provides a solution to the problem of short service life of ordinary filters under high power, and also provides a solution to the low resolution of monochromators under high power ;

4. Compared with the monochromator, the light spot with high beam quality obtained by the present invention is a circular spot, which is easy to focus and couple into the optical fiber;

5. The present invention is simple and easy to implement, and can perform integrated electric control of four gating modes, and can also perform simple control of a single mode according to user needs.

Description of drawings

Fig. 1 is the structural representation of the optical filter of multi-select mode high beam quality according to the present invention;

2 is a schematic structural view of a prism filter based on a light barrier modulator according to a first embodiment of the present invention;

3 is a schematic diagram of the position of the prism filter optical gating element and four gating modes based on the light barrier modulator according to the second embodiment of the present invention, (a) is the short-pass mode, (b) is Long-pass mode, (c) is a band-pass mode, (d) is a band-stop mode, and (e) is a structural schematic diagram of a gating element;

4 is a schematic structural diagram of a reflective grating filter based on a transmissive spatial light modulator according to a second embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a transmissive grating filter based on a reflective spatial light modulator according to a third embodiment of the present invention.

detailed description

The specific implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention should not be limited thereby.

Fig. 1 is the structural representation of the optical filter of multi-selection mode high beam quality according to the present invention, and this optical filter 10 comprises the first dispersive element 1, the second dispersive element 2, filter element 3, controller 4, beam inlet 5 and beam exit 6.

The first dispersive element 1 is used to diverge the initial light beam into a divergent light beam, and is used to restore the gate light beam from the second dispersive element 2 . The second dispersive element 2 is used for converging the diverging light beam from the first dispersive element 1 into a parallel light beam, and converging the gating light beam from the filter element. The first dispersion element 1 and the second dispersion element 2 form a dispersion element pair. The optical filter element 3 is used to gate the parallel light beam from the second dispersive element 2 to a light beam with a required wavelength to obtain the strobed light beam, and reflect the gated light beam to the second dispersive element 2 . The controller 4 is used to control the optical filter element 3 to select the light beam with the required wavelength. The beam entrance 5 is used to control the initial beam to enter the first dispersion element 1 . The beam exit 6 is used to control the gate beam restored by the first dispersion element 1 to exit the optical filter 10 .

The process of obtaining the beam of the gate wavelength through the optical filter 10 will be described below. Firstly, the initial light beam is parallel incident into the first dispersive element 1 through the light beam entrance 5, and forms a divergent light beam after reflection, refraction or diffraction. Here, if the initial beam is spatially parallel light, the beam entrance 5 is the spatial light entrance diaphragm 5; if the initial beam is fiber light, the beam entrance 5 is the fiber light incident coupling interface 5.

Next, the divergent light beam is incident on the second dispersive element 2 and is reflected, refracted or diffracted by the second dispersive element 2 to form a parallel light beam. The cross-section of the parallel light beams is strip-shaped, and they are arranged sequentially in the order of wavelength in space. The parallel light beam is incident into the optical filter element 3 , and the controller 4 controls the optical filter element to select components of required wavelengths and reflect the light of this component (ie, the gate beam) back to the second dispersion element 2 .

The reflected beam (gate beam) forms a converging beam after being reflected, refracted or diffracted by the second dispersion element 2, and the converging gate beam is then reflected, refracted or diffracted by the first dispersion element 1 to form a parallel beam. The pass beam reverts to a parallel gate beam.

Finally, the parallel gating beam exits the optical filter 10 through the beam outlet 6 . Here, in the case of spatial light, the beam exit 6 is a spatial light exit diaphragm 6 to obtain a parallel beam with a circular spot and consistent with the incident light. In the case of fiber optic light, the beam exit 6 is a fiber optic output coupling interface 6 , and the gating beam is coupled into the optical fiber through the fiber optic output coupling interface 6 .

The above-mentioned entrance and exit of the spatial light diaphragm and the entrance and exit of the optical fiber coupling interface can be switched as required.

The first embodiment of the present invention will be described in detail below with reference to FIG. 2 and FIG. 3 .

2 is a schematic structural view of a prism filter based on a light barrier modulator according to the first embodiment of the present invention, and FIG. 3 is a gating element and a prism filter based on a light barrier modulator according to the first embodiment of the present invention. Schematic diagram of the positions of the filter elements in four gating modes, (a) is short-pass mode, (b) is long-pass mode, (c) is band-pass mode, (d) is band-stop mode, (e) is select Schematic diagram of the structure of the pass element.

As shown in Figure 2, the prism filter 20 based on the light barrier modulator includes: a first isosceles prism 11 and a second isosceles prism 12 (i.e. the first dispersion element and the second dispersion element), the light barrier modulator 13 , the controller 14 and the reflector 15, the light barrier modulator 13 and the reflector 15 constitute a filter element. The first isosceles prism 11 and the second isosceles prism 12 constitute a dispersion element pair (prism pair). FIG. 3( e ) is a schematic structural diagram of the gating element (ie, the light barrier modulator 13 and the controller 14 ). The light blocking plate modulator 13 includes a first light blocking plate 131, a second light blocking plate 132, a first translation stage 133, a first rotating stage 134 and a second translation stage 135, wherein the first light blocking plate 131 is fixed on the first translation stage 133 , the second light blocking plate 132 is fixed on the first rotating platform 134 , and the first translation platform 133 and the first rotating platform 134 are fixed on the second translation platform 135 . The controller 14 can move the positions of the first light blocking plate 131 and the second light blocking plate 132 by controlling the first translation stage 133, the first rotation stage 134 and the second translation stage 135, so that the selection of different types and wavelengths of light can be realized. Pass. In this embodiment, the translation stages 133, 135 or the rotation stage 134 include motors and guide rails. The controller 14 is, for example, a computer device loaded with control software/control modules. The controller 14 controls the movement of the translation platform and the rotation of the rotation platform by issuing commands to control the motors. The first moving stage 133 and the second translation stage 135 can move horizontally in a direction perpendicular to the light beam (that is, move horizontally within the plane where the drawing is located). The first rotating table 134 can rotate horizontally within the plane of the drawing. By moving the second translation stage 135, the first light blocking plate 131 and the second light blocking plate 132 can be moved simultaneously.

In addition, among Fig. 2, d ₁ is the insertion amount of the first isosceles prism 11, and d ₂ is the insertion amount of the second isosceles prism 12, and L is the adjacent position of the first isosceles prism 11 and the second isosceles prism 12. distance of parallel planes. By adjusting L, the resolution can be adjusted. Give the first isosceles prism 11 an appropriate insertion amount d ₁ , select an appropriate L, and adjust the insertion amount d ₂ of the second isosceles prism 12 to realize second-order dispersion. Regulation of compensation. For continuous light, there is no need for dispersion compensation, just select an appropriate resolution; for pulsed light, if there is a requirement for pulse width, the dispersion can be changed from positive to negative, from small to large by adjusting L and _d2 , thereby minimizing the pulse width of the light pulse.

The implementation process of the dispersion-compensable prism filter based on the light barrier modulator according to the first embodiment of the present invention will be described in detail below.

As shown in FIG. 2 , the base angles of the first isosceles prism 11 and the second isosceles prism 12 are Brewster's angles suitable for the gating wavelength, and are suitable for linearly polarized initial light beams. The surface of the prism can also be coated with an anti-reflection coating suitable for this wavelength. And the prisms are placed antiparallel to the bottom surfaces, L is the distance between adjacent parallel surfaces of the first isosceles prism 11 and the second isosceles prism 12 . Give the first isosceles prism 11 an appropriate insertion amount d ₁ , select an appropriate L, and by adjusting the insertion amount d ₂ of the second isosceles prism 12, the dispersion can be changed from positive to negative, from small to large, so that The pulse width of the light pulse is minimized.

(1) Realization of short-pass filtering

As shown in Figure 3 (a), move the first translation stage 133 so that the first light blocking plate 131 is close to the second light blocking plate 132, and move the second translation stage 135 to the long-wave side so that the outside of the second light blocking plate 132 ( The side away from the first light blocking plate 131) is located at the cut-off wavelength position of the gate wavelength, which makes the part of the wavelength below the cut-off wavelength be screened out. For example, the spectral range of the initial light is 550-650nm, and the required spectral range is the short-pass part of 600nm. Two translation stages 135 to the 650nm side, so that the outside of the second light blocking plate 132 (the side away from the first light blocking plate 131) is located at 600nm, the part with a wavelength greater than 600nm is blocked by the second light blocking plate 132, and the part below 600nm was screened out.

(2) Realization of long-pass filtering

As shown in Figure 3 (b), move the first translation stage 133 so that the first light blocking plate 131 is close to the second light blocking plate 132, and move the second translation stage 135 to the short-wave side so that the outside of the first light blocking plate 131 ( The side away from the second light blocking plate 132) is located at the cut-off wavelength position of the gate wavelength, which makes the part of the wavelength above the cut-off wavelength be screened out. For example, the spectral range of the initial light is 550-650nm, and the required spectral range is the part of the 600nm long pass. The second translation stage 135 makes the second light baffle 132 move to the 650nm side, so that the outside of the first light baffle 131 (the side away from the second light baffle 132) is located at 600nm, and the part with a wavelength less than 600nm is covered by the first light baffle. 131, the part above 600nm is screened out.

(3) Realization of bandpass filtering

As shown in Figure 3 (c), move the first translation stage 133 so that a slit is formed between the first light blocking plate 131 and the second light blocking plate 132, and determine the width of the slit according to the bandwidth of the required gate wavelength . The second translation stage 135 is moved so that the central position of the slit is located at the central wavelength position of the gate wavelength, so that the bandpass wavelength is screened out. For example, the spectral range of the initial light is 550-650nm, and the required spectral range is the band-pass part of 595-605nm. As mentioned above, the first translation stage 133 is moved, and the first light-blocking plate 131 and the second light-blocking plate 131 are formed according to the band-passing part. A slit is formed between the optical plates 132, and the second translation stage 135 is moved so that the center of the slit is located at the 600nm position, and the width of the slit is gated with a wavelength bandwidth of 10nm. Pass light (that is, the 595-605nm bandpass part).

(4) Realization of band-stop filtering

As shown in Figure 3 (d), move the first translation stage 133 so that the distance between the first light baffle 131 and the second light baffle 132 is far enough that the first light baffle 131 will not block the light. Translate the stage 135 so that the center position of the light blocking plate 132 is located at the center wavelength of the band stop, and rotate the first rotary table 134 by a certain angle, so that the light of part of the wavelength is blocked by the second light blocking plate 132, which screens out the band stop wavelength . For example, the spectral range of the initial light is 550-650nm, and the part of 595-605nm needs to be filtered out. A light blocking plate 131 is moved to a position where it will not block light, and the second translation stage 135 is moved so that the center position of the light blocking plate 132 is located at 600nm, and the first rotating table 134 is rotated by a certain angle, so that the light of the 595-605nm part is captured by the second The second light blocking plate 132 blocks, which screens out light with wavelengths of 550-595nm and 605nm-650nm.

The second and third embodiments of the present invention will be described in detail below with reference to FIG. 4 and FIG. 5 .

FIG. 4 is a schematic structural diagram of a reflective grating filter 40 based on a transmissive spatial light modulator according to a second embodiment of the present invention. The optical filter 40 includes a first reflective grating 21 and a second reflective grating 22 (i.e. a first dispersive element and a second dispersive element), and the first reflective grating 21 and the second reflective grating 22 form a pair of dispersive elements (reflective grating pair ). The diffraction planes of the reflective grating pair are parallel to each other. The initial beam passes through the first reflective grating 21 and the second reflective grating 22 to form a strip-shaped spatially distributed beam. The optical filter 40 also includes a transmissive spatial light modulation element 23 and a reflective mirror 231 constituting an optical filter element. After passing through the first reflective grating and the second reflective grating, the light beam forming a strip-shaped spatial distribution passes through the transmissive spatial light modulation element 23 . The optical filter 40 also includes a controller 24, the controller 24 can realize the gating of different types and wavelengths of light by controlling the transmittance distribution of the transmissive spatial light modulation element 23 in the light transmission area. In this embodiment, the transmissive spatial light modulator 23 and the controller 24 may be integrated, such as a commercially available transmissive spatial light modulator.

In FIG. 4 , θ is the incident angle of the initial light on the first reflective grating 21 , and L is the distance between the parallel planes of the first reflective grating 21 and the second reflective grating 22 . By adjusting L, the resolution can be adjusted. By selecting an appropriate L and adjusting the incident angle θ of the initial light on the first reflective grating 21 , the control of the second-order dispersion compensation can be realized. For continuous light, there is no need to perform dispersion compensation, as long as an appropriate resolution is selected. For pulsed light, if there is a requirement for pulse width, the dispersion can be changed from positive to negative, from small to large, by adjusting L and θ. Thereby the pulse width of the light pulse is reduced to a minimum.

The implementation process of the reflective grating dispersion compensation filter based on the transmissive spatial light modulator in the second embodiment of the present invention will be described below.

As shown in Figure 4, the diffraction planes of the first reflective grating 21 and the second reflective grating 22 are parallel to each other, and the initial beam forms a strip-shaped spatially distributed beam after passing through the first reflective grating and the second reflective grating, and θ is the first An incident angle of a reflective grating 21 , L is the distance between the parallel planes of the first reflective grating 21 and the second reflective grating 22 . By adjusting L, the resolution can be adjusted. By selecting an appropriate L, by adjusting the incident angle θ of the initial light on the first reflective grating 21, the dispersion can be changed from positive to negative, from small to large, so as to minimize the pulse width of the light pulse.

The controller 24 controls the transmittance distribution of the transmissive spatial light modulation element 23 in the light transmission region, for example, by controlling the electric field distribution of the transmissive spatial light modulation element 23 . For example, adjust the transmittance of the area larger than 500nm to 0 to achieve 500nm short-pass filtering; similarly, adjust the transmittance of the area less than 500nm to 0 to achieve 500nm long-pass filtering Light; adjust the transmittance of the area on both sides of 480nm-500nm to 0 to achieve 480nm-500nm band-pass filter; adjust the transmittance of 480nm-500nm area to 0 to achieve 480nm-500nm band-stop filter Light.

FIG. 5 is a schematic structural diagram of a transmissive grating filter 50 based on a reflective spatial light modulator according to a third embodiment of the present invention. The filter 50 includes a first transmission grating 31 and a second transmission grating 32 (i.e. a first dispersion element and a second dispersion element), and the first transmission grating 31 and the second transmission grating 32 form a pair of dispersion elements (transmission grating pair) . The diffraction planes of the transmission grating pair are parallel to each other. The initial beam passes through the first transmission grating 31 and the second transmission grating 32 to form a strip-shaped spatially distributed beam. The optical filter 50 also includes a reflective spatial light modulation element 33 constituting an optical filter element. After passing through the first transmission grating and the second transmission grating, the light beam forming a strip-shaped spatial distribution passes through the reflective spatial light modulation element 33 . The filter 40 also includes a controller 34 . The controller 34 can realize the gating of different types and wavelengths of light by controlling the reflectivity distribution of the reflective spatial light modulation element 33 in the incident area. In this embodiment, the reflective spatial light modulator 33 and the controller 34 may be integrated, such as a commercially available reflective spatial light modulator.

In FIG. 5 , θ is the incident angle of the initial light on the first transmission grating 31 , and L is the distance between the parallel planes of the first transmission grating 31 and the second transmission grating 32 . By adjusting L, the resolution can be adjusted. By selecting an appropriate L, by adjusting the incident angle θ of the initial light on the first transmission grating 31 , the control of the second-order dispersion compensation can be realized. For continuous light, there is no need to perform dispersion compensation, as long as an appropriate resolution is selected. For pulsed light, if there is a requirement for pulse width, the dispersion can be changed from positive to negative, from small to large, by adjusting L and θ. Thereby the pulse width of the light pulse is reduced to a minimum.

The implementation process of the transmissive grating dispersion compensation filter based on the reflective spatial light modulator according to the third embodiment of the present invention will be described below.

As shown in Figure 5, the diffraction planes of the first transmission grating 31 and the second transmission grating 32 are parallel to each other, and the initial light beam forms a strip-shaped spatially distributed light beam after passing through the first transmission grating and the second transmission grating, and θ is the initial light beam at the An incident angle of the transmission grating 31 , L is the distance between the parallel planes of the first transmission grating 31 and the second transmission grating 32 . By adjusting L, the resolution can be adjusted. By selecting an appropriate L, by adjusting the incident angle θ of the initial light on the first transmission grating 31, the dispersion can be changed from positive to negative, from small to large, thereby minimizing the pulse width of the light pulse.

The controller 34 controls the reflectance distribution of the reflective spatial light modulation element 33 in the light incident region, for example, by controlling the electric field distribution of the reflective spatial light modulation element 33 . For example, adjusting the reflectance of the area larger than 500nm of the beam incident area to 0 can realize 500nm short-pass filtering; similarly, adjusting the reflectance of the area smaller than 500nm to 0 can realize 500nm long-pass filtering; Adjust the reflectivity of the area on both sides of 480nm-500nm to 0 to realize 480nm-500nm band-pass filter; adjust the reflectance of 480nm-500nm area to 0 to realize 480nm-500nm band-stop filter.

In the above-mentioned embodiments, although the first embodiment is a combination of a prism pair and a baffle modulator, and the second and third embodiments are a combination of a grating pair and a spatial light modulator, those skilled in the art can also implement a prism pair The combination with the spatial light modulator, or the combination of the grating pair and the light barrier modulator can achieve the same technical effect.

In addition, it should be noted that after the optical filter of the present invention is installed for the first time, it is necessary to carry out filter calibration, that is, to perform calibration according to whether dispersion compensation is required, required resolution, and the position of the gating element. The specific correction method is as follows.

First, the position of the initial incident light should be fixed to ensure that it enters the filter from one position each time; then, the distance L between the first dispersive element 1 and the second dispersive element 2 is determined according to the required resolution, that is to say , while achieving the optimum resolution, it is necessary to ensure that the beam dispersion can be compensated by changing the insertion amount of the dispersion element or changing the incident angle; the position of the filter element is corrected, for example, when the filter element is a light baffle, it needs to be corrected For the position of the light-baffle modulator (including the light-baffle, translation stage and rotation stage) in each gating mode, when the filter element is a spatial light modulation element, it is necessary to correct the wavelength and position of each micro-region in the light incident area. Finally, by storing these position information in the controller, the control of the gating wavelength can be realized.

The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the implementation scope of the present invention. Anyone with ordinary knowledge in the technical field may make various changes and modifications without departing from the spirit and scope of the present invention, and the protection scope of the present invention shall be determined by the protection scope defined in the claims.

Claims (10)

1. a kind of light filter of multi-strobe pattern high light beam quality, its special type is, including：

First dispersion element, being used for dissipating incipient beam of light is divergent beams, and for reduction gating light beam；

Second dispersion element, for being converged to collimated light beam by described divergent beams and will gate beam convergence；

Filter element, for the described collimated light beam from described second dispersion element, the light beam of wavelength needed for gating obtains Described gating light beam, and described gating light beam is reflexed to described second dispersion element；Described filter element is modulated for light barrier Device, the described plate modulator that is in the light includes：

First light barrier and the second light barrier, for gating the light of required wavelength；

First translation stage, is used for fixing the first light barrier, with the position of mobile first light barrier；

First turntable, is used for fixing the second light barrier, to rotate the angle of the second light barrier；And

Second translation stage, is used for fixing the first translation stage and the first turntable, with mobile described first light barrier and described second The position of light barrier；

Controller, for controlling the light beam of wavelength needed for described filter element gating；And

Light beam gateway, for controlling described incipient beam of light to be incident to described first dispersion element and being used for controlling described The described gating beam exit of one dispersion element reduction is to described light filter.

2. the light filter of multi-strobe pattern high light beam quality according to claim 1 is it is characterised in that described first dispersion Element constitutes dispersion element pair with described second dispersion element, and described dispersion element is to for waiting girdle prism pair, or grating pair.

3. the light filter of multi-strobe pattern high light beam quality according to claim 2 is it is characterised in that described wait girdle prism To base angle size be suitable for gating wavelength Brewster angle.

4. the light filter of multi-strobe pattern high light beam quality according to claim 2 is it is characterised in that described wait girdle prism To surface be coated be suitable for gating wavelength anti-reflection film.

5. the light filter of multi-strobe pattern high light beam quality according to claim 2 is it is characterised in that described grating is to bag Include reflective gratings to and transmission-type grating pair, the diffraction plane of described grating pair is parallel to each other.

6. the light filter of multi-strobe pattern high light beam quality according to claim 1 is it is characterised in that described light barrier is adjusted Device processed manually controls or carries out Electronic control by controller.

7. the light filter of multi-strobe pattern high light beam quality according to claim 1 is it is characterised in that needed for described gating The gated mode of the light beam of wavelength includes long logical, short logical, band logical and band four kinds of gated mode of resistance.

8. the light filter of multi-strobe pattern high light beam quality according to claim 1 is it is characterised in that described light beam comes in and goes out Mouth is changeable gateway, including spatial light diaphragm formula gateway and optical fiber optical coupling interface type gateway；Described spatial light light Late formula gateway is spatial light incidence diaphragm, outgoing diaphragm；Described optical fiber optical coupling interface type gateway is optical fiber light incidence coupling Splice grafting mouth, outgoing coupling interface, can root between described spatial light diaphragm formula gateway and optical fiber optical coupling interface type gateway Switch over according to needs.

9. the light filter of multi-strobe pattern high light beam quality according to claim 2 is it is characterised in that described wait girdle prism To including the girdle prisms such as the first grade girdle prism and second, by setting the first grade girdle prism amount of being suitably inserting d₁, choose first Deng suitable distance L between the adjacent, parallel face of the girdle prisms such as girdle prism and second, adjust insertion d of the second grade girdle prism₂, The regulation and control that achievable 2nd order chromatic dispersion compensates.

10. the light filter of multi-strobe pattern high light beam quality according to claim 2 is it is characterised in that described grating pair Including the first grating and the second grating, by choosing suitable distance L between the first grating and the parallel surface of the second grating, adjust The regulation and control that initial light compensates in the incidence angle θ of the first grating, achievable 2nd order chromatic dispersion.