CN218298011U - Femtosecond folding BOXCARS signal generating device - Google Patents
Femtosecond folding BOXCARS signal generating device Download PDFInfo
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Abstract
A femtosecond folding BOXCARS signal generating device belongs to the technical field of nonlinear spectrum. The utility model provides a vibration energy level that current light path system arouses not adjustable, and can't realize the problem of the evolution of a plurality of time dimension detection sample vibration energy level along with time. The system comprises a first plane mirror, a second plane mirror, a first diaphragm, a dichroic mirror, a beam splitter, a third plane mirror, a second diaphragm, a fourth plane mirror, a fifth plane mirror, a sixth plane mirror, a seventh plane mirror, an eighth plane mirror, a ninth plane mirror, a tenth plane mirror, an eleventh plane mirror, a twelfth plane mirror, a third diaphragm, a thirteenth plane mirror, a fourteenth plane mirror, a fourth diaphragm, a fifteenth plane mirror and a sixteenth plane mirror; different vibration energy levels of the sample are excited by changing the wavelength of the pump light. The utility model is suitable for a non-linear spectrum technical field.
Description
Technical Field
The utility model belongs to the technical field of the nonlinear optical spectrum, concretely relates to foldable BOXCARS signal's of femto second production device of compact multidimensional time resolution.
Background
The femtosecond CARS has the characteristics of strong signal, high sensitivity, small fluorescence interference and the like, has high space-time resolution, and can remarkably improve the accuracy and reliability of detection, so that the femtosecond CARS is widely applied to the fields of coherent control chemical reaction, biological microscopic imaging, combustion temperature measurement, detection of dynamic information of molecules in femtosecond level and the like. Throughout the research work at home and abroad, it can be known that the CARS spectrum technology is developing towards a better signal noise processing technology, a higher temporal resolution and spatial resolution, and a wider application. Although some optical path systems obtain abundant spectral line information, the operability of experiments and the difficulty of optical path adjustment limit the application of the CARS technology. Among them, the folded BOXCARS optical path system is a typical representative. The folded BOXCARS optical path system has high spatial resolution, extremely high degree of freedom in the optical path adjusting process and capability of improving the signal-to-noise ratio, and is a CARS spectral technology with strong operability and wide application. However, the light path system meeting the requirement of folding BOXCARS phase matching is complex to build, the light path adjustment difficulty is high, the experiment repeatability is low, the vibration energy level excited by the existing light path system is not adjustable, and the evolution of the vibration energy level of a plurality of time dimension detection samples along with time cannot be realized, so that a compact multi-dimensional time-resolved femtosecond folding BOXCARS signal generation device is necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the vibration energy level excited by the existing optical path system is not adjustable and the evolution of a plurality of time dimension detection sample vibration energy levels along with time can not be realized, and a femtosecond folding BOXCARS signal generating device is provided.
The utility model discloses a solve the technical scheme that above-mentioned technical problem took and be:
a femtosecond folded BOXCARS signal generating device, comprising a first plane mirror, a second plane mirror, a first diaphragm, a dichroic mirror, a beam splitter, a third plane mirror, a second diaphragm, a fourth plane mirror, a fifth plane mirror, a sixth plane mirror, a seventh plane mirror, an eighth plane mirror, a ninth plane mirror, a tenth plane mirror, an eleventh plane mirror, a twelfth plane mirror, a third diaphragm, a thirteenth plane mirror, a fourteenth plane mirror, a fourth diaphragm, a fifteenth plane mirror, a sixteenth plane mirror, wherein:
the first beam of femtosecond pulse laser and the second beam of femtosecond pulse laser respectively enter different positions of the first plane mirror;
the first beam of femtosecond pulse laser is reflected by the first plane mirror and then enters the second plane mirror;
the first beam of femtosecond pulse laser reflected by the second plane mirror vertically enters the center of the first diaphragm;
the light transmitted by the first diaphragm is incident to the dichroic mirror;
the first beam of femtosecond pulse laser transmitted by the dichroic mirror is incident to the beam splitter;
the light reflected by the beam splitter is incident to the third plane mirror;
the light reflected by the third plane mirror is vertically incident to the center of the second diaphragm;
the light transmitted by the second diaphragm enters the fourth plane mirror;
the light reflected by the fourth plane mirror enters the fifth plane mirror and then is emitted out by the fifth plane mirror;
the light transmitted by the beam splitter is incident to a sixth plane mirror;
the light reflected by the sixth plane mirror is incident to the seventh plane mirror;
the light reflected by the seventh plane mirror enters the eighth plane mirror;
the light reflected by the eighth plane mirror enters the ninth plane mirror;
the light reflected by the ninth plane mirror is incident to the tenth plane mirror;
the light reflected by the tenth plane mirror enters the eleventh plane mirror and then exits through the eleventh plane mirror;
the second beam of femtosecond pulse laser is reflected by the first plane reflector and then enters the second plane reflector, and the first diaphragm is completely opened to enable the second beam of femtosecond pulse laser reflected by the second plane reflector to enter the dichroic mirror;
the second beam of femtosecond pulse laser reflected by the dichroic mirror is incident to the twelfth plane reflecting mirror;
the light reflected by the twelfth plane mirror vertically enters the center of the third diaphragm;
the light transmitted by the third diaphragm is incident to the thirteenth plane mirror;
the light reflected by the thirteenth plane mirror is incident to the fourteenth plane mirror;
the light reflected by the fourteenth plane mirror vertically enters the center of the fourth diaphragm;
the light transmitted by the fourth diaphragm is incident to the fifteenth plane mirror;
the light reflected by the fifteenth plane mirror enters the sixteenth plane mirror and then exits through the sixteenth plane mirror.
Further, the device also comprises a first translation platform and a second translation platform;
the eighth plane reflecting mirror and the ninth plane reflecting mirror are fixed on the first translation platform;
and the thirteenth plane reflecting mirror and the fourteenth plane reflecting mirror are fixed on the second translation platform.
Furthermore, the device also comprises an optical bread board, wherein the first plane mirror, the second plane mirror, the first diaphragm, the dichroic mirror, the beam splitter, the third plane mirror, the second diaphragm, the fourth plane mirror, the fifth plane mirror, the sixth plane mirror, the seventh plane mirror, the tenth plane mirror, the eleventh plane mirror, the twelfth plane mirror, the third diaphragm, the fourth diaphragm, the fifteenth plane mirror, the sixteenth plane mirror, the first translation stage and the second translation stage are all fixed on the optical bread board.
Furthermore, the aperture sizes of the first diaphragm, the second diaphragm, the third diaphragm and the fourth diaphragm are all 1 mm-3 mm.
Further, the starting wavelength of the dichroic mirror is 735nm.
The utility model has the advantages that:
the utility model discloses a change the frequency difference of the wavelength realization pump light stokes light of pump light, utilize the frequency difference of two bundles of light and the phase place matching relation that three bundles of light satisfied to realize arousing the purpose of the different vibration energy levels of sample, make the vibration energy level adjustable. The time delay between the Stokes light and the probe light and the time delay between the pump light and the Stokes light are utilized to achieve the purpose of time resolution, and then the evolution of the vibration energy level of the sample along with the time is detected from multiple time dimensions.
Moreover, the fixing device is arranged on the optical bread board, so that the whole system can move flexibly and be applied to more optical path structures.
Drawings
Fig. 1 is a schematic diagram of a femtosecond foldable BOXCARS signal generating device according to the present invention;
in the figure, 1, a first plane mirror; 2. a second planar mirror; 3. a first diaphragm; 4. a dichroic mirror; 5. a beam splitter; 6. a third plane mirror; 7. a second diaphragm; 8. a fourth plane mirror; 9. a fifth plane mirror; 10. a sixth plane mirror; 11. a seventh plane mirror; 12. an eighth plane mirror; 13. a ninth plane mirror; 14. a first translation stage; 15. a tenth plane mirror; 16. an eleventh plane mirror; 17. a twelfth plane mirror; 18. a third diaphragm; 19. a thirteenth plane mirror; 20. a fourteenth plane mirror; 21. a second translation stage; 22. a fourth diaphragm; 23. a fifteenth plane mirror; 24. a sixteenth plane mirror; 25. an optical bread board.
Detailed Description
The first specific implementation way is as follows: this embodiment will be described with reference to fig. 1. The femtosecond folding BOXCARS signal generation device according to the embodiment comprises a first plane mirror 1, a second plane mirror 2, a first diaphragm 3, a dichroic mirror 4, a beam splitter 5, a third plane mirror 6, a second diaphragm 7, a fourth plane mirror 8, a fifth plane mirror 9, a sixth plane mirror 10, a seventh plane mirror 11, an eighth plane mirror 12, a ninth plane mirror 13, a tenth plane mirror 15, an eleventh plane mirror 16, a twelfth plane mirror 17, a third diaphragm 18, a thirteenth plane mirror 19, a fourteenth plane mirror 20, a fourth diaphragm 22, a fifteenth plane mirror 23, and a sixteenth plane mirror 24, wherein:
the first beam of femtosecond pulse laser and the second beam of femtosecond pulse laser are respectively incident to different positions of the first plane mirror 1;
the first beam of femtosecond pulse laser is reflected by the first plane mirror 1 and then enters the second plane mirror 2;
the first beam of femtosecond pulse laser reflected by the second plane mirror 2 vertically enters the center of the first diaphragm 3;
the light transmitted through the first diaphragm 3 is incident to the dichroic mirror 4;
the first beam of femtosecond pulse laser transmitted by the dichroic mirror 4 is incident to the beam splitter 5;
the light reflected by the beam splitter 5 is incident on the third plane mirror 6;
the light reflected by the third plane mirror 6 is vertically incident to the center of the second diaphragm 7;
the light transmitted by the second diaphragm 7 is incident on the fourth plane mirror 8;
the light reflected by the fourth plane mirror 8 enters the fifth plane mirror 9 and then exits through the fifth plane mirror 9;
the light transmitted by the beam splitter 5 is incident on the sixth plane mirror 10;
the light reflected by the sixth plane mirror 10 is incident on the seventh plane mirror 11;
the light reflected by the seventh plane mirror 11 is incident on the eighth plane mirror 12;
the light reflected by the eighth plane mirror 12 is incident on the ninth plane mirror 13;
the light reflected by the ninth plane mirror 13 is incident on the tenth plane mirror 15;
the light reflected by the tenth plane mirror 15 enters the eleventh plane mirror 16 and exits through the eleventh plane mirror 16;
a second beam of femtosecond pulse laser is reflected by the first plane reflector 1 and then enters the second plane reflector 2, and the first diaphragm 3 is completely opened to enable the second beam of femtosecond pulse laser reflected by the second plane reflector 2 to enter the dichroic mirror 4;
the second beam of femtosecond pulse laser reflected by the dichroic mirror 4 is incident to the twelfth plane mirror 17;
the light reflected by the twelfth plane mirror 17 is vertically incident to the center of the third diaphragm 18;
the light transmitted through the third diaphragm 18 is incident on the thirteenth plane mirror 19;
the light reflected by the thirteenth plane mirror 19 is incident on the fourteenth plane mirror 20;
the light reflected by the fourteenth plane mirror 20 is vertically incident to the center of the fourth diaphragm 22;
the light transmitted through the fourth aperture 22 is incident on the fifteenth plane mirror 23;
the light reflected by the fifteenth plane mirror 23 enters the sixteenth plane mirror 24 and exits through the sixteenth plane mirror 24.
The utility model discloses a theory of operation does:
first, a first femtosecond pulse laser beam, which is a stokes beam and a probe beam, is incident on the center of the first plane mirror 1, a light beam reflected by the first plane mirror 1 is incident on the center of the second plane mirror 2, and the angle of the first plane mirror 1 is adjusted to pass the laser beam through the center of the first aperture 3. The femtosecond pulse laser passing through the center of the first diaphragm 3 can transmit the dichroic mirror 4 at a transmittance of more than 93% and be incident on the beam splitter 5 because its wavelength is more than 735nm. The femtosecond pulse laser is averagely divided into two beams by the beam splitter 5 of 50, and the transmitted femtosecond pulse laser is used as stokes light and enters the center of the sixth plane mirror 10; the reflected femtosecond pulse laser light is incident on the center of the third plane mirror 6 as a probe light. The light reflected by the third plane mirror 6 is vertically incident to the center of the second diaphragm 7, and the femtosecond pulse laser is made to vertically pass through the center of the second diaphragm 7 strictly by finely adjusting the angle of the second plane mirror 2 and is incident to the center of the fourth plane mirror 8. The light reflected by the fourth plane mirror 8 enters the edge of the fifth plane mirror 9 and exits through the fifth plane mirror 9.
Next, the stokes light transmitted by the beam splitter 5 enters the center of the sixth plane mirror 10, and then enters the center of the seventh plane mirror 11 after being reflected by the sixth plane mirror 10. In fig. 1, the two-dimensional movement of the X and Y axes corresponds to the forward and backward movement and the left and right movement in the horizontal direction. By adjusting the movement of the first translation stage 14 in the Y direction, the light reflected by the seventh plane mirror 11 is incident on the center of the eighth plane mirror 12, and is reflected by the eighth plane mirror 12 to be incident on the center of the ninth plane mirror 13. By adjusting the movement of the first translation stage 14 in the X direction, the time delay between the stokes light and the detection light is satisfied, and the purpose of time resolution is achieved. The light reflected by the ninth plane mirror 13 enters the center of the tenth plane mirror 15, is reflected by the tenth plane mirror 15, enters the edge of the eleventh plane mirror 16, and exits through the eleventh plane mirror 16.
Finally, the second beam of femtosecond pulse laser as the pump light is made to enter a position about 10mm above the center of the first plane mirror 1, the light reflected by the first plane mirror 1 is made to enter a position about 10mm above the center of the second plane mirror 2, and the first diaphragm 3 is opened to make the femtosecond pulse laser enter the dichroic mirror 4. Since the wavelength of the pumping light is less than 735nm, the pumping light can be reflected to the center of the twelfth plane mirror 17 by the dichroic mirror 4 with a reflectivity of more than 98%, and then reflected by the twelfth plane mirror 17, so that the femtosecond pulse laser is vertically incident to the center of the third diaphragm 18 by adjusting the angle of the dichroic mirror 4. By adjusting the movement of the second translation stage 21 in the Y direction, the central light passing through the third diaphragm 18 is incident on the center of the thirteenth plane mirror 19, and is reflected by the thirteenth plane mirror 19 to be incident on the center of the fourteenth plane mirror 20. The time delay of the pump light and the Stokes light is met by adjusting the movement of the second translation stage 21 in the X direction, and the purpose of exciting different vibration energy levels of the sample is achieved. By reflection by the fourteenth plane mirror 20, the reflected light is made to enter the center of the fourth aperture 22 perpendicularly by adjusting the angle of the twelfth plane mirror 17. The light transmitted through the center of the fourth diaphragm 22 enters the center of the fifteenth plane mirror 23, is reflected by the fifteenth plane mirror 23, enters the edge of the sixteenth plane mirror 24, and finally exits through the sixteenth plane mirror 24.
By finely adjusting the angles of the two plane reflectors of the incident port of the optical path system, the spatial parallelism of the optical path system can be kept under the condition of laser incidence at different angles.
The above description of the working principle is only one possibility of the incident positions of the first femtosecond pulse laser beam and the second femtosecond pulse laser beam, and is not taken as a specific limitation on the incident positions of the two femtosecond pulse laser beams.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the apparatus further comprises a first translation stage 14 and a second translation stage 21;
the eighth plane mirror 12 and the ninth plane mirror 13 are fixed on the first translation stage 14;
the thirteenth plane mirror 19 and the fourteenth plane mirror 20 are fixed to the second translation stage 21.
The first translation stage 14 may control the movement of the eighth plane mirror 12 and the ninth plane mirror 13 in the Y-axis direction as a whole, that is, the movement in the left-right direction, or may control the movement of the eighth plane mirror 12 and the ninth plane mirror 13 in the X-direction as a whole, that is, the movement in the front-back direction. The first translation stage 14 is adjusted to make the femtosecond pulse laser incident on the center of the eighth plane mirror 12, and make the stokes light and the probe light have a time delay, so as to achieve the purpose of time resolution.
The second translation stage 21 can control the movement of the thirteenth plane mirror 19 and the fourteenth plane mirror 20 in the Y axis direction as a whole, that is, the left-right direction, and can also control the movement of the thirteenth plane mirror 19 and the fourteenth plane mirror 20 in the X direction as a whole, that is, the front-back direction. The second translation stage 21 is adjusted to make the femtosecond pulse laser incident to the center of the thirteenth plane mirror 19, and make the pump light and the stokes light have time delay, so as to achieve the purpose of exciting different vibration energy levels of the sample.
The third concrete implementation mode: the second embodiment is different from the first embodiment in that: the device also comprises an optical bread board 25, wherein the first plane mirror 1, the second plane mirror 2, the first diaphragm 3, the dichroic mirror 4, the beam splitter 5, the third plane mirror 6, the second diaphragm 7, the fourth plane mirror 8, the fifth plane mirror 9, the sixth plane mirror 10, the seventh plane mirror 11, the tenth plane mirror 15, the eleventh plane mirror 16, the twelfth plane mirror 17, the third diaphragm 18, the fourth diaphragm 22, the fifteenth plane mirror 23, the sixteenth plane mirror 24, the first translation stage 14 and the second translation stage 21 are all fixed on the optical bread board 25.
By fixing the device on a movable small bread board, the whole system can be kept compact and can be flexibly moved, thereby being applied to more optical path structures.
The fourth concrete implementation mode: the third difference between the present embodiment and the specific embodiment is that: the aperture sizes of the first diaphragm 3, the second diaphragm 7, the third diaphragm 18 and the fourth diaphragm 22 are all 1 mm-3 mm.
The embodiment adjusts the energy and collimation of the incident light by controlling the size of the incident light spot, and when the size of the light spot is 1 mm-3 mm, the generated foldable BOXCARS signal is relatively stable.
The fifth concrete implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the dichroic mirror 4 has an initial wavelength of 735nm.
When the wavelength of the femtosecond pulse laser is greater than 735nm and is incident on the dichroic mirror 4, the transmittance of the laser beam may be greater than 93%, and when the wavelength of the femtosecond pulse laser is less than 735nm and is incident on the dichroic mirror 4, the transmittance of the laser beam may be greater than 98%, so that beam splitting of the pump light, the stokes light, and the probe light may be well achieved.
The sixth specific implementation mode: the fifth embodiment is different from the fifth embodiment in that: the front surface of the beam splitter 5 is plated with a beam splitting film for an incident wavelength range of 700-1100nm, the rear surface is plated with a beam splitting film for an incident wavelength range of 700-1100nm, and the beam splitting ratio (R: T) when the incident angle is 45 degrees is 50, so that stokes light and detection light can be averagely split, time delay between the stokes light and the detection light is realized, and the purpose of time resolution is achieved.
The above description of the present invention is not intended to limit the embodiments of the present invention. It is obvious to a person skilled in the art that, on the basis of the above description, other variations and modifications can be made, which are not exhaustive of all the embodiments, and all the obvious variations and modifications which are encompassed by the present invention are within the scope of the present invention.
Claims (5)
1. A femtosecond folded BOXCARS signal generation device, which is characterized by comprising a first plane mirror (1), a second plane mirror (2), a first diaphragm (3), a dichroic mirror (4), a beam splitter (5), a third plane mirror (6), a second diaphragm (7), a fourth plane mirror (8), a fifth plane mirror (9), a sixth plane mirror (10), a seventh plane mirror (11), an eighth plane mirror (12), a ninth plane mirror (13), a tenth plane mirror (15), an eleventh plane mirror (16), a twelfth plane mirror (17), a third diaphragm (18), a thirteenth plane mirror (19), a fourteenth plane mirror (20), a fourth diaphragm (22), a fifteenth plane mirror (23) and a sixteenth plane mirror (24), wherein:
the first beam of femtosecond pulse laser and the second beam of femtosecond pulse laser are respectively incident to different positions of the first plane mirror (1);
the first beam of femtosecond pulse laser is reflected by the first plane reflector (1) and then enters the second plane reflector (2);
the first beam of femtosecond pulse laser reflected by the second plane reflector (2) vertically enters the center of the first diaphragm (3);
the light transmitted by the first diaphragm (3) is incident to the dichroic mirror (4);
the first beam of femtosecond pulse laser transmitted by the dichroic mirror (4) is incident to the beam splitter (5);
the light reflected by the beam splitter (5) is incident on a third plane mirror (6);
the light reflected by the third plane mirror (6) is vertically incident to the center of the second diaphragm (7);
the light transmitted by the second diaphragm (7) enters a fourth plane reflector (8);
the light reflected by the fourth plane reflector (8) enters the fifth plane reflector (9) and is emitted by the fifth plane reflector (9);
the light transmitted by the beam splitter (5) enters a sixth plane mirror (10);
the light reflected by the sixth plane mirror (10) is incident on a seventh plane mirror (11);
the light reflected by the seventh plane mirror (11) enters the eighth plane mirror (12);
the light reflected by the eighth plane mirror (12) is incident on a ninth plane mirror (13);
the light reflected by the ninth plane mirror (13) is incident on the tenth plane mirror (15);
the light reflected by the tenth plane reflector (15) enters the eleventh plane reflector (16) and is emitted by the eleventh plane reflector (16);
a second beam of femtosecond pulse laser is reflected by the first plane reflector (1) and then enters the second plane reflector (2), and the first diaphragm (3) is completely opened to enable the second beam of femtosecond pulse laser reflected by the second plane reflector (2) to enter the dichroic mirror (4);
the second beam of femtosecond pulse laser reflected by the dichroic mirror (4) is incident to a twelfth plane reflecting mirror (17);
the light reflected by the twelfth plane mirror (17) is vertically incident to the center of the third diaphragm (18);
the light transmitted by the third diaphragm (18) is incident to a thirteenth plane mirror (19);
the light reflected by the thirteenth plane mirror (19) is incident on the fourteenth plane mirror (20);
the light reflected by the fourteenth plane mirror (20) is vertically incident to the center of the fourth diaphragm (22);
the light transmitted by the fourth diaphragm (22) enters a fifteenth plane mirror (23);
the light reflected by the fifteenth plane mirror (23) enters the sixteenth plane mirror (24) and exits through the sixteenth plane mirror (24).
2. A femtosecond folded BOXCARS signal generation device according to claim 1, further comprising a first translation stage (14) and a second translation stage (21);
the eighth plane reflecting mirror (12) and the ninth plane reflecting mirror (13) are fixed on the first translation platform (14);
the thirteenth plane reflecting mirror (19) and the fourteenth plane reflecting mirror (20) are fixed on the second translation platform (21).
3. A femtosecond folded BOXCARS signal generation device according to claim 2, characterized in that the device further comprises an optical bread board (25), and the first plane mirror (1), the second plane mirror (2), the first diaphragm (3), the dichroic mirror (4), the beam splitter (5), the third plane mirror (6), the second diaphragm (7), the fourth plane mirror (8), the fifth plane mirror (9), the sixth plane mirror (10), the seventh plane mirror (11), the tenth plane mirror (15), the eleventh plane mirror (16), the twelfth plane mirror (17), the third diaphragm (18), the fourth diaphragm (22), the fifteenth plane mirror (23), the sixteenth plane mirror (24), the first translation stage (14) and the second translation stage (21) are all fixed on the optical bread board (25).
4. A femtosecond folded BOXCARS signal generation device according to claim 3, wherein the aperture sizes of the first diaphragm (3), the second diaphragm (7), the third diaphragm (18) and the fourth diaphragm (22) are all 1 mm-3 mm.
5. A femtosecond folded BOXCARS signal generation device according to claim 4, wherein the starting wavelength of the dichroic mirror (4) is 735nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222390548.4U CN218298011U (en) | 2022-09-08 | 2022-09-08 | Femtosecond folding BOXCARS signal generating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222390548.4U CN218298011U (en) | 2022-09-08 | 2022-09-08 | Femtosecond folding BOXCARS signal generating device |
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| CN218298011U true CN218298011U (en) | 2023-01-13 |
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| CN202222390548.4U Expired - Fee Related CN218298011U (en) | 2022-09-08 | 2022-09-08 | Femtosecond folding BOXCARS signal generating device |
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2022
- 2022-09-08 CN CN202222390548.4U patent/CN218298011U/en not_active Expired - Fee Related
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Granted publication date: 20230113 |