Narrow-band tunable dye laser

Abstract

The utility model discloses a narrow-band tunable dye laser, which comprises a shell, and a first beam splitter, a first beam expanding and shaping lens group, a resonant cavity, a diaphragm, a first dye cell, a beam expanding and collimating lens group, a second dye cell, a delay shaping assembly, a second beam splitter and a second beam expanding and shaping lens group which are arranged in the shell. Three-stage amplification is adopted, the whole device occupies a small space under the condition that the same amplification power is ensured, and the problem that an existing dye laser is bloated in structure is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of dye lasers and relates to a narrowband tunable dye laser. Background Art

[0002] PLIF technology usually requires a dye laser with high repetition rate and adjustable high energy to reflect a rapidly changing flow field. Each substance to be measured has its corresponding stimulated fluorescence spectrum line. Therefore, for a laser of a certain wavelength, the narrower its line width, the higher the fluorescence intensity generated by the corresponding substance to be measured. Among them, the dye laser has the characteristics of tunability, large energy, high repetition rate, narrow line width, low threshold, and strong adaptability to pump light. The dye laser is a classic single-frequency pulsed tunable laser. The working principle of the dye laser is that a strong laser pulse excites a specific dye to generate a broadband fluorescence spectrum. The grating pair, as the core device, selects a specific spectrum line to generate a single-frequency pulsed laser in a set resonator. After further amplification, the single-frequency laser is output as a dye laser. The built-in grating pair can be precisely tuned to achieve a specific precise spectrum line.

[0003] However, when it is necessary to amplify the power of the light with the wavelength selected from the pump light, the existing structure of the dye laser is relatively bulky. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a narrowband tunable dye laser, which solves the problem of the bulky structure of the existing dye laser by optimizing the optical path structure and adopting three-stage amplification.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A narrowband tunable dye laser, comprising a housing, and a first beam splitter, a first beam expanding and shaping lens group, a resonant cavity, a diaphragm, a first dye cell, a beam expanding and collimating lens group, a second dye cell, a delay shaping component and a second beam expanding and shaping lens group which are all built in the housing. The housing is provided with a light inlet and a light outlet. The first beam splitter receives pump light from the light inlet and forms a first reflected light and a first transmitted light. The first reflected light sequentially passes through the first beam expanding and shaping lens group, the resonant cavity, the diaphragm, the first dye cell, the beam expanding and collimating lens group and the second dye cell and is emitted from the light outlet. The delay shaping component includes a second beam splitter and a plurality of reflectors. The first transmitted light enters the delay shaping component and is divided into a second reflected light and a second transmitted light by the second beam splitter. The second transmitted light sequentially passes through the complete delay shaping component and the second dye cell and is emitted from the light outlet. The second reflected light passes through the second beam expanding and shaping lens group, the first dye cell, the beam expanding and collimating lens group and the second dye cell and is emitted from the light outlet. The first reflected light, the second reflected light and the second transmitted light converge after passing through the second dye cell. Wherein, the resonant cavity is adapted to screen light of a target wavelength and amplify the power.

[0007] Further, a third dye cell, a broadening component, a grating, a first reflector and a second reflector are arranged in the resonant cavity. The resonant cavity is provided with an optical path outlet and an optical path inlet. The dye cell receives the first reflected light from the optical path inlet. The first reflected light sequentially passes through the broadening component, the grating and the first reflector. The grating, the first reflector and the second reflector are all connected with adjusting mechanisms. The first reflector is adapted to reflect the received light back to the grating along the original path. The first reflected light sequentially passes through the grating, the broadening component, the third dye cell and the second reflector to form resonance. A part of the first reflected light is reflected by the second reflector and another part passes through the second reflector. The broadening component is adapted to thicken the returned first reflected light.

[0008] Further, a third reflector and a fourth reflector are further included. The first reflected light sequentially passes through the first beam expanding and shaping lens group, the resonant cavity, the third reflector, the diaphragm, the fourth reflector, a reflector group, the first dye cell, the beam expanding and collimating lens group and the second dye cell and is emitted from the light outlet.

[0009] Further, a third beam expanding and shaping lens group is further included. The third beam expanding and shaping lens group is arranged between the delay shaping component and the second dye cell.

[0010] Further, the housing includes a bottom plate, a back plate connected to the rear side of the bottom plate, and side plates connected to both sides of the bottom plate. The top of the housing and part or all of the front side are covered with a cover plate. The first beam splitter, the first beam expanding and shaping lens group, the resonant cavity, the aperture, the first dye cell, the beam expanding and collimating lens group, the second dye cell, the delay shaping assembly, the second beam splitter, and the second beam expanding and shaping lens group are all installed on the bottom plate. The light input port and the light output port are respectively arranged on the two side plates.

[0011] Further, the cover plate includes a top cover and a front cover which are rotatably connected.

[0012] Further, a telescopic mechanism for rotating and opening / closing the cover plate is installed on each side plate.

[0013] Further, a plurality of reinforcing plates are connected to the bottom of the bottom plate, and both ends of the reinforcing plates are connected to the side plates.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The dye laser of the present utility model includes a housing, and a first beam splitter, a first beam expanding and shaping lens group, a resonant cavity, an aperture, a first dye cell, a beam expanding and collimating lens group, a second dye cell, a delay shaping assembly, a second beam splitter, and a second beam expanding and shaping lens group which are all built in the housing. The pump light enters from the light input port of the housing and is incident on the first beam splitter. The first beam splitter reflects and transmits it into a first reflected light and a first transmitted light. The first reflected light is expanded and shaped by the first beam expanding and shaping lens group, screened and amplified by the wavelength of the resonant cavity, passes through the aperture, the first dye cell, the beam expanding and collimating lens group, and the second dye cell, and is emitted from the light output port. The aperture limits the size of the light beam. The first dye cell is continuously excited by the first reflected light to amplify the power. The beam expanding and collimating lens group expands the light beam of the first reflected light. The second dye cell is excited by the first reflected light to amplify the power again. After the first transmitted light enters the delay shaping assembly, under the action of the second beam splitter, the second reflected light is expanded and shaped by the second beam expanding and shaping lens group. The first dye cell is excited by the second reflected light to amplify the power of the second reflected light. The beam expanding and collimating lens group expands the second reflected light. The second dye cell is excited by the second reflected light to amplify the power of the second reflected light again. The second transmitted light passes through the second beam expanding and shaping lens group, the first dye cell, the beam expanding and collimating lens group, and the second dye cell, and is emitted from the light output port. Finally, the first reflected light, the second reflected light, and the second transmitted light converge. By optimizing the optical path structure and adopting three-stage amplification, while ensuring the same amplification power, the space occupied by the whole device is small, and the problem of the bloated structure of the existing dye laser is solved. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings, where:

[0017] Figure 1 It is a schematic layout diagram of a narrowband tunable dye laser according to an embodiment of the present utility model;

[0018] Figure 2 It is an axonometric view of a narrowband tunable dye laser according to an embodiment of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of a resonant cavity according to an embodiment of the present utility model.

[0020] Markings in the figure:

[0021] 10 - housing; 11 - light inlet; 12 - light outlet; 13 - bottom plate; 14 - side plate; 15 - back plate; 16 - cover plate; 161 - front cover; 162 - top cover; 17 - telescopic mechanism;

[0022] 20 - first beam splitter;

[0023] 30 - first beam expanding and shaping lens group;

[0024] 40 - resonant cavity; 41 - third dye cell; 42 - broadening component; 43 - grating; 44 - first reflector; 45 - second reflector;

[0025] 50 - aperture; 51 - third reflector; 52 - fourth reflector;

[0026] 60 - first dye cell;

[0027] 70 - beam expanding and collimating lens group;

[0028] 80 - second dye cell;

[0029] 90 - delay shaping component; 91 - second beam splitter; 92 - reflector;

[0030] 100 - second beam expanding and shaping lens group;

[0031] 110 - third beam expanding and shaping lens group;

[0032] 200 - pump light; 210 - first reflected light; 220 - first transmitted light; 221 - second reflected light; 222 - second transmitted light. Detailed implementation manners

[0033] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model, that is, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the detailed description of the embodiments of the present utility model provided in the drawings below is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0035] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0036] As described in the background art, when it is necessary to amplify the power of the light with the selected wavelength in the pump light, the existing dye lasers usually have a bulky structure, occupy a large space and are not easy to transport.

[0037] Based on this, the inventor created a narrowband tunable dye laser of the present application to solve the above technical problems.

[0038] The features and performance of the present utility model will be further described in detail below with reference to the embodiments.

[0039] Embodiment

[0040] Please refer to Figures 1 to 3, A narrowband tunable dye laser, comprising a housing 10, and a first beam splitter 20, a first beam expanding and shaping lens group 30, a resonant cavity 40, a diaphragm 50, a first dye cell 60, a beam expanding and collimating lens group 70, a second dye cell 80, a delay shaping assembly 90 and a second beam expanding and shaping lens group 100, all of which are built into the housing 10. The housing 10 is provided with a light input port 11 and a light output port 12. For example, the light input port 11 and the light output port 12 can be respectively arranged on both sides of the housing 10. For example, a plurality of feet can be arranged at the bottom of the housing 10, and anti-slip pads can be arranged at the bottoms of the feet.

[0041] The first beam splitter 20 receives the pump light 200 from the light input port 11 and forms a first reflected light 210 and a first transmitted light 220. The first reflected light 210 sequentially passes through the first beam expanding and shaping lens group 30, the resonant cavity 40, the diaphragm 50, the first dye cell 60, the beam expanding and collimating lens group 70 and the second dye cell 80 and is emitted from the light output port 12. The delay shaping assembly 90 includes a second beam splitter 91 and a plurality of reflectors 92. The first transmitted light 220 enters the delay shaping assembly 90 and is divided into a second reflected light 221 and a second transmitted light 222 by the second beam splitter 91. Here, that is to say, the plurality of reflectors are used to delay the light and change the direction of the light path. The second beam splitter 91 can be arranged between the plurality of reflectors, so as to divide the first transmitted light 220 into the second reflected light 221 and the second transmitted light 222. Here, the resonant cavity 40 can repeatedly oscillate and strengthen the first reflected light 210 to achieve power amplification, so as to strengthen the first reflected light 210.

[0042] The second transmitted light 222 sequentially passes through the complete delay shaping assembly 90 and the second dye cell 80 and is emitted from the light output port 12. The second reflected light 221 passes through the second beam expanding and shaping lens group 100, the first dye cell 60, the beam expanding and collimating lens group 70 and the second dye cell 80 and is emitted from the light output port 12. The first reflected light 210, the second reflected light 221 and the second transmitted light 222 converge after passing through the second dye cell 80; wherein, the resonant cavity 40 is adapted to screen the light of the target wavelength and amplify the power.

[0043] The dye laser of the present utility model includes a housing 10, and a first beam splitter 20, a first beam expanding and shaping lens group 30, a resonant cavity 40, a diaphragm 50, a first dye cell 60, a beam expanding and collimating lens group 70, a second dye cell 80, a delay shaping assembly 90, a second beam splitter 91 and a second beam expanding and shaping lens group 100, all of which are built into the housing 10. The pump light 200 enters from the light inlet 11 of the housing 10 and is incident on the first beam splitter 20. The first beam splitter 20 reflects and transmits it into a first reflected light 210 and a first transmitted light 220. The first reflected light 210 is expanded and shaped by the first beam expanding and shaping lens group 30, filtered by wavelength and amplified by the resonant cavity 40, passes through the diaphragm 50, the first dye cell 60, the beam expanding and collimating lens group 70 and the second dye cell 80, and is emitted from the light outlet 12. The diaphragm 50 limits the beam size. The first dye cell 60 is continuously excited by the first reflected light 210 to amplify the power. The beam expanding and collimating lens group 70 expands the beam of the first reflected light 210. The second dye cell 80 is excited by the first reflected light 210 to amplify the power again. After the first transmitted light 220 enters the delay shaping assembly 90, under the action of the second beam splitter 91, the second reflected light 221 is expanded and shaped by the second beam expanding and shaping lens group 100. The first dye cell 60 is excited by the second reflected light 221 to amplify the power of the second reflected light 221. The beam expanding and collimating lens group 70 expands the second reflected light 221. The second dye cell 80 is excited by the second reflected light 221 to amplify the power of the second reflected light 221 again. The second transmitted light 222 passes through the second beam expanding and shaping lens group 100, the first dye cell 60, the beam expanding and collimating lens group 70 and the second dye cell 80 and is emitted from the light outlet 12. Finally, the first reflected light 210, the second reflected light 221 and the second transmitted light 222 converge. By optimizing the optical path structure and adopting three-stage amplification, while ensuring the same amplification power, the space occupied by the whole device is small, and the problem of the bloated structure of the existing dye laser is solved.

[0044] In another embodiment, a third dye cell 41, a broadening component 42, a grating 43, a first reflector 44 and a second reflector 45 are disposed in the resonant cavity 40. The resonant cavity 40 is provided with an optical path outlet and an optical path inlet. The dye cell receives the first reflected light 210 from the optical path inlet. The first reflected light 210 sequentially passes through the broadening component 42, the grating 43 and the first reflector 44. Adjusting mechanisms are connected to the grating 43, the first reflector 44 and the second reflector 45. The first reflector 44 is adapted to reflect the received light back to the grating 43 along the original path. The first reflected light 210 sequentially passes through the grating 43, the broadening component 42, the third dye cell 41 and the second reflector 45 to form resonance. A part of the first reflected light 210 is reflected by the second reflector 45 and another part passes through the second reflector 45. The broadening component 42 is adapted to thicken the returned first reflected light 210. The first reflected light 210 enters from the optical path inlet, generates excitation light after passing through the third dye cell 41. The excitation light is wavelength-screened by the grating 43, then enters the first reflector 44 to reflect the light back to the grating 43 along the original path, thickens the light beam again through the broadening component 42, is excited again by the third dye cell 41, and then part of the light is reflected back by the second reflector 45 to form oscillation, so as to enhance and screen the power of the first reflected light 210. With such a setting, the structure is simple.

[0045] In another embodiment, the dye laser further includes a third reflector 51 and a fourth reflector 52. The first reflected light 210 sequentially passes through the first beam expanding and shaping lens group 30, the resonant cavity 40, the third reflector 51, the aperture 50, the fourth reflector 52, the mirror group, the first dye cell 60, the beam expanding and collimating lens group 70 and the second dye cell 80 and exits from the light outlet 12. For example, the aperture 50 can be adjustable to facilitate the regulation of the beam size.

[0046] In another embodiment, the dye laser further includes a third beam expanding and shaping lens group 110. The third beam expanding and shaping lens group 110 is disposed between the delay shaping component 90 and the second dye cell 80. With such a setting, the second transmitted light 222 can be beam-expanded and shaped, which is convenient for the subsequent convergence of three lights.

[0047] In another embodiment, the housing 10 includes a bottom plate 13, a back plate 15 connected to the rear side of the bottom plate 13, and side plates 14 connected to both sides of the bottom plate 13. The top of the housing 10 and part or all of the front side are covered with a cover plate 16. The first beam splitter 20, the first beam expanding and shaping lens group 30, the resonant cavity 40, the aperture 50, the first dye cell 60, the beam expanding and collimating lens group 70, the second dye cell 80, the delay shaping assembly 90, the second beam splitter 91, and the second beam expanding and shaping lens group 100 are all installed on the bottom plate 13. The light input port 11 and the light output port 12 are respectively arranged on the two side plates 14. With such an arrangement, it is convenient to adjust the components on the bottom plate 13 when the cover plate 16 is opened. Preferably, the cover plate 16 includes a top cover 162 and a front cover 161 that are rotatably connected to each other.

[0048] In another embodiment, a telescopic mechanism 17 for rotating and opening / closing the cover plate 16 is installed on each side plate 14. With such an arrangement, it is convenient to open and close the cover plate 16 through the telescopic mechanism 17, and the opening and closing are simple. For example, the telescopic mechanism 17 can be a cylinder or a hydraulic cylinder.

[0049] In another embodiment, a plurality of reinforcing plates are connected to the bottom of the bottom plate 13, and both ends of the reinforcing plates are connected to the side plates 14. With such an arrangement, the structural strength of the bottom plate 13 can be effectively improved.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, and improvements made by those skilled in the art within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A narrow-band tunable dye laser, characterized in that: The invention comprises a shell, and a first beam splitter, a first beam expansion and shaping lens group, a resonant cavity, an aperture, a first dye pool, a beam expansion collimator lens group, a second dye pool, a time delay shaping component and a second beam expansion and shaping lens group, all of which are built into the shell. The shell is provided with a light inlet and a light outlet. The first beam splitter receives pump light from the light inlet and forms a first reflected light and a first transmitted light. The first reflected light sequentially passes through the first beam expansion and shaping lens group, the resonant cavity, the aperture, the first dye pool, the beam expansion collimator lens group and the second dye pool and is emitted from the light outlet. The time delay shaping component comprises a second beam splitter. A beam mirror and a plurality of reflectors, the first transmitted light enters the delay shaping component and is divided into a second reflected light and a second transmitted light by the second beam splitter, the second transmitted light passes through the complete delay shaping component and the second dye pool in sequence and is emitted from the light outlet, the second reflected light passes through the second beam expansion shaping mirror group, the first dye pool, the beam expansion collimating mirror group and the second dye pool and is emitted from the light outlet, the first reflected light, the second reflected light and the second transmitted light merge after passing through the second dye pool; wherein the resonant cavity is suitable for screening light of a target wavelength and amplifying the power.

2. A narrow-band tunable dye laser according to claim 1, characterized in that: A third dye pool, a widening component, a grating, a first reflector and a second reflector are arranged in the resonant cavity. The resonant cavity is provided with an optical path exit and an optical path entrance. The dye pool receives the first reflected light from the optical path entrance. The first reflected light passes through the widening component, the grating and the first reflector in sequence. The grating, the first reflector and the second reflector are all connected with an adjustment mechanism. The first reflector is suitable for reflecting the received light along the original path to the grating. The first reflected light passes through the grating, the widening component, the third dye pool and the second reflector in sequence to form resonance. Part of the first reflected light is reflected from the second reflector and another part passes through the second reflector. The widening component is suitable for thickening the returned first reflected light.

3. A narrow-band tunable dye laser according to claim 1, characterized in that: It also includes a third reflector and a fourth reflector, and the first reflected light passes through the first beam expansion and shaping mirror group, the resonant cavity, the third reflector, the aperture, the fourth reflector, the reflector group, the first dye pool, the beam expansion collimating mirror group and the second dye pool in sequence and is emitted from the light outlet.

4. A narrow-band tunable dye laser according to claim 1, characterized in that: It also includes a third beam expansion and shaping mirror group, which is arranged between the time delay shaping component and the second dye pool.

5. A narrow-band tunable dye laser according to any one of claims 1 to 4, characterized in that: The shell includes a bottom plate, a back plate connected to the rear side of the bottom plate, and side plates connected to both sides of the bottom plate. The top of the shell and part or all of the front side are covered with a cover plate. The first beam splitter, the first beam expansion and shaping lens group, the resonant cavity, the aperture, the first dye pool, the beam expansion collimating lens group, the second dye pool, the delay shaping component, the second beam splitter and the second beam expansion and shaping lens group are all installed on the bottom plate, and the light inlet and the light outlet are respectively arranged on the two side plates.

6. A narrow-band tunable dye laser according to claim 5, characterized in that: The cover plate comprises a top cover and a front cover which are rotatably connected to each other.

7. A narrow-band tunable dye laser according to claim 6, characterized in that: A telescopic mechanism for rotating and opening and closing the cover is installed on each side plate.

8. The narrow-band tunable dye laser according to claim 5, characterized in that: A plurality of reinforcing plates are connected to the bottom of the bottom plate, and two ends of the reinforcing plates are connected to the side plates.

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