Multi-wavelength tunable solid laser and tuning method

Abstract

The invention discloses a multi-wavelength tunable solid laser and a tuning method, the multi-wavelength tunable solid laser comprises a stimulated radiation mechanism, a rotating mechanism arranged at the inner side of the stimulated radiation mechanism and an opening and closing mechanism arranged at one side of the rotating mechanism, the stimulated radiation mechanism comprises a resonant cavity and lens groups arranged at the two ends of the resonant cavity, the gain crystal is arranged in the resonant cavity; the gain crystal and the rotating mechanism are arranged in the middle of the lens group; the rotating mechanism comprises a rotating support and a rotating piece arranged on the rotating support. The rotating piece can swing on the rotating frame in a reciprocating mode to form any inclination angle. The driven part surrounds the pore-forming pile structure, the driving part is used for driving the driven part to be opened and closed and finely tuning the wavelength, and the output wavelength of the laser is more accurately positioned on the target wavelength by accurately controlling the size of the pore diameter, so that the wavelength stability and accuracy of the whole laser system are improved.

Description

Technical Field

[0001] The invention relates to the field of tunable solid-state lasers, and in particular to a multi-wavelength tunable solid-state laser and a tuning method. Background Art

[0002] As laser technology continues to develop, multi-wavelength tunable solid-state lasers, as an advanced light source device, have attracted extensive research attention with their unique performance and application prospects. This type of laser can continuously change its output wavelength within a certain range, thus showing great application potential in many fields such as spectroscopy, photochemistry, medicine, biology, integrated optics, pollution monitoring, semiconductor material processing, optical device characteristic evaluation, optical integrated circuit testing, quantum optical information processing and communication. Most traditional lasers can only emit lasers with fixed wavelengths, which limits their use in complex applications that require multiple wavelength light sources. Tunable lasers achieve continuous or discrete adjustment of laser wavelengths through a series of technical means, thereby greatly expanding the application range of lasers. Among them, multi-wavelength tunable solid-state lasers combine the stability of solid-state lasers and the flexibility of tunable lasers, becoming an important direction for the development of laser technology. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and provides a multi-wavelength tunable solid-state laser and a tuning method.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a multi-wavelength tunable solid-state laser, comprising: a stimulated radiation mechanism, a rotating mechanism arranged inside the stimulated radiation mechanism, and an opening and closing mechanism arranged on one side of the rotating mechanism,

[0005] The stimulated radiation mechanism includes: a resonant cavity, lens groups arranged at both ends of the resonant cavity, and a gain crystal arranged inside the resonant cavity; the gain crystal and the rotating mechanism are both arranged in the middle of the lens group;

[0006] The rotating mechanism includes: a rotating bracket and a rotating member arranged on the rotating bracket; the rotating member can swing back and forth on the rotating bracket at any tilt angle to tune the output wavelength of the laser;

[0007] The opening and closing mechanism includes: an active member and a driven member meshing with the active member; the driven member surrounds the hole-forming pile structure, and the active member is used to drive the opening and closing of the driven member to finely tune the wavelength.

[0008] In a preferred embodiment of the present invention, the lens group includes a total reflection mirror and a half reflection mirror, and the gain crystal is a barium fluoride crystal, and the gain crystal is used to amplify the optical signal.

[0009] In a preferred embodiment of the present invention, the rotating mechanism is arranged close to the semi-reflecting mirror, the barium fluoride crystal is arranged close to the total reflecting mirror, and the opening and closing mechanism is arranged on a side of the rotating mechanism close to the semi-reflecting mirror.

[0010] In a preferred embodiment of the present invention, the rotating bracket includes a main fixing frame and a sub-fixing frame arranged on the other side of the rotating member, the main fixing frame and the sub-fixing frame are both fixedly connected to the resonant cavity, the main fixing frame and the sub-fixing frame are both slidably connected to the rotating member, and a conical hole is provided at the connection between the sub-fixing frame and the rotating member.

[0011] In a preferred embodiment of the present invention, the rotating member includes a rotating plate, rotating balls arranged on both sides of the rotating plate, and a rotating rod arranged on one side of the spherical surface of one of the rotating balls; the rotating ball is arranged in a hemispherical shape, and the rotating ball is slidably connected to the main fixing frame and the auxiliary fixing frame respectively, and the rotating plate is an Iceland spar birefringent filter.

[0012] In a preferred embodiment of the present invention, the rotating rod is bent in an inclined Z shape, one end of the rotating rod is fixedly connected to the arc surface of the rotating ball, and the other end is fixedly connected to the first motor, the first motor is fixedly connected to a motor frame, and the motor frame is fixedly connected to the resonant cavity.

[0013] In a preferred embodiment of the present invention, the active component includes a driving gear and a ring gear meshing with the driving gear; a second motor is fixedly connected to one side of the driving gear, the second motor is fixedly connected to the rotating plate, and the ring gear is provided with teeth for meshing on both inner and outer sides of the circumference.

[0014] In a preferred embodiment of the present invention, the driven member includes a driven gear and a triangular plate meshing with the driven gear; teeth are provided at the bottom of the triangular plate, the transmission wheel is rotatably connected to the rotating plate, the triangular plate is slidably connected to the rotating plate, a plurality of triangular plates are provided and combined into a square, and a gap is formed in the middle of the combined square during the movement of the triangular plates, and the gap opens and closes as the triangular plates move.

[0015] A laser tuning method comprises the following steps:

[0016] S1: The pump light inputs the light energy from the outside of the resonant cavity to the inside of the resonant cavity, thereby irradiating the gain crystal to induce stimulated radiation;

[0017] S2: The gain crystal that induces stimulated emission releases more and more photons that reflect back and forth in the resonant cavity, while the rotating plate rotates a certain angle to make a preliminary adjustment to the wavelength of the transmitted light;

[0018] S3: During the initial adjustment, the opening and closing mechanism rotates to form a hole of a certain aperture to enhance the light of a specific wavelength;

[0019] S4: The enhanced light is emitted through a half mirror to form a laser.

[0020] In a preferred embodiment of the present invention, in S2, the side lobes and secondary peaks in the output spectrum can be reduced by allowing the light reflected back and forth to pass through a rotating plate at a certain angle.

[0021] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0022] (1) The present invention provides a multi-wavelength tunable solid-state laser and a tuning method. By using a rotating plate and an opening and closing mechanism in coordination with each other, and by combining a birefringent filter, i.e., an Iceland spar birefringent filter, with the opening and closing mechanism, a preliminary wavelength selection and tuning is first performed, and then the wavelength tuning effect is further optimized to achieve a higher tuning accuracy. Compared with the prior art, the output wavelength of the laser is more accurately positioned at the target wavelength by precisely controlling the size of the aperture, thereby improving the wavelength stability and accuracy of the entire laser system.

[0023] (2) The present invention provides a multi-wavelength tunable solid-state laser and a tuning method. By using a rotating plate, an active element and a driven element in coordination with each other, the Brewster angle of the incident light is changed by changing the angle of the rotating plate, thereby changing the wavelength of the transmitted light. The refractive index and the incident angle of the light of the Iceland spar birefringent filter determine the propagation path and phase difference of the light wave in the crystal, thereby affecting the wavelength of the transmitted light. By adjusting the aperture size, it is directly determined which wavelengths of light can pass smoothly. Smaller-sized micropores can limit the passage of longer wavelengths of light and allow shorter wavelengths of light to pass through, thereby achieving the enhancement or weakening of specific wavelengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 is a three-dimensional structural diagram of a preferred embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the opening and closing mechanism structure of a preferred embodiment of the present invention;

[0027] In the figure: 1. stimulated radiation mechanism; 2. rotating mechanism; 3. opening and closing mechanism; 4. resonant cavity; 5. lens group; 6. main fixed frame; 7. auxiliary fixed frame; 8. rotating plate; 9. driving gear; 10. ring gear; 11. driven gear; 12. triangular plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0032] As shown in the figure, a multi-wavelength tunable solid laser includes: a stimulated radiation mechanism, a rotating mechanism arranged inside the stimulated radiation mechanism, and an opening and closing mechanism arranged on one side of the rotating mechanism.

[0033] The stimulated radiation mechanism includes: a resonant cavity, lens groups arranged at both ends of the resonant cavity, and a gain crystal arranged inside the resonant cavity; the gain crystal and the rotating mechanism are both arranged in the middle of the lens group;

[0034] In a preferred embodiment of the present invention, the lens group includes a total reflection mirror and a half reflection mirror, and the gain crystal is a barium fluoride crystal, and the gain crystal is used to amplify the optical signal.

[0035] In a preferred embodiment of the present invention, the rotating mechanism is arranged close to the semi-reflecting mirror, the barium fluoride crystal is arranged close to the total reflecting mirror, and the opening and closing mechanism is arranged on a side of the rotating mechanism close to the semi-reflecting mirror.

[0036] It should be noted that the lens group includes a total reflection mirror and a half reflection mirror, which are respectively arranged at both ends of the resonant cavity, and the gain crystal is placed between the total reflection mirror and the half reflection mirror to form a resonant cavity, wherein the gain crystal is specifically a barium fluoride crystal, and the rotating mechanism is also arranged inside the resonant cavity, and the rotating mechanism is arranged between the barium fluoride crystal and the half reflection mirror. After the pump light is injected from the outside of the resonant cavity, the pump light excites the barium fluoride crystal to generate light, and the light is reflected back and forth between the total reflection mirror and the half reflection mirror. During the reflection process, preliminary wavelength tuning is performed through the rotating mechanism, and fine tuning is performed through an opening and closing mechanism with a certain aperture.

[0037] The rotating mechanism includes: a rotating bracket and a rotating member arranged on the rotating bracket; the rotating member can swing back and forth on the rotating bracket at any tilt angle to tune the output wavelength of the laser;

[0038] In a preferred embodiment of the present invention, the rotating bracket includes a main fixing frame and a sub-fixing frame arranged on the other side of the rotating member, the main fixing frame and the sub-fixing frame are both fixedly connected to the resonant cavity, the main fixing frame and the sub-fixing frame are both slidably connected to the rotating member, and a conical hole is provided at the connection between the sub-fixing frame and the rotating member.

[0039] In a preferred embodiment of the present invention, the rotating member includes a rotating plate, rotating balls arranged on both sides of the rotating plate, and a rotating rod arranged on one side of the spherical surface of one of the rotating balls; the rotating ball is arranged in a hemispherical shape, and the rotating ball is slidably connected to the main fixing frame and the auxiliary fixing frame respectively, and the rotating plate is an Iceland spar birefringent filter.

[0040] In a preferred embodiment of the present invention, the rotating rod is bent in an inclined Z shape, one end of the rotating rod is fixedly connected to the arc surface of the rotating ball, and the other end is fixedly connected to the first motor, the first motor is fixedly connected to a motor frame, and the motor frame is fixedly connected to the resonant cavity.

[0041] It should be noted that the main fixing frame and the auxiliary fixing frame are arranged in an eight-shaped arrangement, and the main fixing frame and the auxiliary fixing frame rotating parts are arranged between the main fixing frame and the auxiliary fixing frame, and the main fixing frame, the rotating part and the auxiliary fixing frame are arranged in this sliding connection, and the sliding connection parts in contact therein are all hemispherical and hemispherical grooves are arranged for sliding connection, and hemispherical grooves are provided at the connection between the main fixing frame and the auxiliary fixing frame and the rotating part, and two rotating balls are fixedly connected to the two side surfaces of the rotating plate, and the rotating balls are slidably connected to the hemispherical grooves. The rotating plate is set at a certain angle when it is initially set, and a conical hole is provided on the side of the auxiliary fixing frame, and the conical hole passes through the hemispherical groove. One end of the rotating rod is connected to the rotating ball The first motor is fixedly connected, and the other end is fixedly connected to the first motor. The motor frame is fixedly connected to the bottom of the first motor. The motor frame is fixedly connected to the resonant cavity. The rotating rod is set in a Z shape and is tilted. The tilt angle of the rotating rod is consistent with the taper of the conical hole, and the rotating rod rotates in accordance with the conical hole when rotating. In this way, the first motor rotates, and the rotating plate is driven to rotate by the rotating rod. The rotating plate is not tilted, and the rotating rod is also tilted, so that the rotating plate swings at any angle with its own center as the center during the rotation process, and the rotating plate is an Iceland spar birefringent filter. The Iceland spar filter itself is a birefringent material with different refractive indices for two orthogonal polarized lights (o light and e light). When light passes through the BRF, the o light and the e light will propagate at different speeds, thereby generating an optical path difference, which varies with the wavelength and is affected by the angle of the incident light. By rotating the rotating plate, the angle between the incident light and the optical axis of the rotating plate can be changed, thereby affecting the optical path difference between the o light and the e light. When the optical path difference meets the interference condition of a certain wavelength, the light of that wavelength will be strengthened or weakened, thereby achieving wavelength tuning. By gradually adjusting the angle between the incident light and the BRF optical axis, the change in the output spectrum can be observed. When rotated to a certain angle, the light of a specific wavelength will meet the interference condition and be selected, thereby achieving preliminary wavelength tuning.

[0042] The opening and closing mechanism includes: an active member and a driven member meshing with the active member; the driven member surrounds the hole-forming pile structure, and the active member is used to drive the opening and closing of the driven member to finely tune the wavelength.

[0043] In a preferred embodiment of the present invention, the active component includes a driving gear and a ring gear meshing with the driving gear; a second motor is fixedly connected to one side of the driving gear, the second motor is fixedly connected to the rotating plate, and the ring gear is provided with teeth for meshing on both inner and outer sides of the circumference.

[0044] In a preferred embodiment of the present invention, the driven member includes a driven gear and a triangular plate meshing with the driven gear; teeth are provided at the bottom of the triangular plate, the transmission wheel is rotatably connected to the rotating plate, the triangular plate is slidably connected to the rotating plate, a plurality of triangular plates are provided and combined into a square, and a gap is formed in the middle of the combined square during the movement of the triangular plates, and the gap opens and closes as the triangular plates move.

[0045] The gears are connected to the front and rear of the gears, and the two gears are connected to the front and rear of the gears are connected to the rear of the gears, and the two gears are connected to the front and rear of the gears, and the ...

[0046] A laser tuning method comprises the following steps:

[0047] S1: The pump light inputs the light energy from the outside of the resonant cavity to the inside of the resonant cavity, thereby irradiating the gain crystal to induce stimulated radiation;

[0048] S2: The gain crystal that induces stimulated emission releases more and more photons that reflect back and forth in the resonant cavity, while the rotating plate rotates a certain angle to make a preliminary adjustment to the wavelength of the transmitted light;

[0049] S3: During the initial adjustment, the opening and closing mechanism rotates to form a hole of a certain aperture to enhance the light of a specific wavelength;

[0050] S4: The enhanced light is emitted through a half mirror to form a laser.

[0051] In a preferred embodiment of the present invention, in S2, the side lobes and secondary peaks in the output spectrum can be reduced by allowing the light reflected back and forth to pass through a rotating plate at a certain angle.

[0052] It should be noted that the enhancement of light of a specific wavelength means that when light passes through an aperture birefringent filter, light of different wavelengths will experience different degrees of refraction and diffraction due to the size and shape of the microholes. Light of longer wavelengths is more easily diffracted by the edges of the holes, while light of shorter wavelengths is more likely to pass through the center area of ​​the holes. By adjusting the size of the aperture, the diffraction effect of the microholes on the light waves is changed, thereby affecting the transmittance of light of different wavelengths. Smaller apertures may tend to allow shorter wavelengths of light to pass through, while larger apertures may allow a wider range of wavelengths to pass through.

[0053] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A multi-wavelength tunable solid-state laser, comprising: A stimulated radiation mechanism, a rotating mechanism arranged inside the stimulated radiation mechanism, and an opening and closing mechanism arranged on one side of the rotating mechanism, characterized in that: The stimulated radiation mechanism comprises: a resonant cavity, a lens group arranged at both ends of the resonant cavity, and a gain crystal arranged inside the resonant cavity; the gain crystal and the rotating mechanism are both arranged in the middle of the lens group; The rotating mechanism comprises: a rotating bracket and a rotating member arranged on the rotating bracket; the rotating member can swing back and forth on the rotating bracket at any tilt angle to tune the output wavelength of the laser; The opening and closing mechanism comprises: an active member and a driven member meshed with the active member; the driven member surrounds the hole-forming pile structure, and the active member is used to drive the opening and closing of the driven member to finely tune the wavelength.

2. The multi-wavelength tunable solid-state laser according to claim 1, characterized in that: The lens group includes a total reflection mirror and a half reflection mirror, the gain crystal is a barium fluoride crystal, and the gain crystal is used to amplify the optical signal.

3. The multi-wavelength tunable solid-state laser according to claim 2, characterized in that: The rotating mechanism is arranged close to the semi-reflecting mirror, the barium fluoride crystal is arranged close to the total reflecting mirror, and the opening and closing mechanism is arranged on a side of the rotating mechanism close to the semi-reflecting mirror.

4. The multi-wavelength tunable solid-state laser according to claim 1, characterized in that: The rotating bracket includes a main fixing frame and a secondary fixing frame arranged on the other side of the rotating member, the main fixing frame and the secondary fixing frame are both fixedly connected to the resonant cavity, the main fixing frame and the secondary fixing frame are both slidably connected to the rotating member, and a conical hole is provided at the connection between the secondary fixing frame and the rotating member.

5. The multi-wavelength tunable solid-state laser according to claim 1, characterized in that: The rotating member includes a rotating plate, rotating balls arranged on both sides of the rotating plate, and a rotating rod arranged on one side of the spherical surface of one of the rotating balls; the rotating ball is arranged in a hemispherical shape, and the rotating ball is slidably connected to the main fixing frame and the auxiliary fixing frame respectively, and the rotating plate is an Iceland spar birefringent filter.

6. The multi-wavelength tunable solid-state laser according to claim 5, characterized in that: The rotating rod is bent in an inclined Z shape, one end of the rotating rod is fixedly connected to the arc surface of the rotating ball, and the other end is fixedly connected to a first motor, a motor frame is fixedly connected to the first motor, and the motor frame is fixedly connected to the resonant cavity.

7. The multi-wavelength tunable solid-state laser according to claim 5, characterized in that: The active component includes a driving gear and a gear ring meshing with the driving gear; a second motor is fixedly connected to one side of the driving gear, the second motor is fixedly connected to the rotating plate, and the gear ring is provided with teeth for meshing on both inner and outer sides of the circumference.

8. The multi-wavelength tunable solid-state laser according to claim 1, characterized in that: The driven member includes a driven gear and a triangular plate meshing with the driven gear; teeth are provided at the bottom of the triangular plate, the transmission wheel is rotatably connected to the rotating plate, the triangular plate is slidably connected to the rotating plate, a plurality of triangular plates are provided and combined into a square, and a gap is formed in the middle of the combined square during the movement of the triangular plate, and the gap opens and closes as the triangular plate moves.

9. A laser tuning method, based on the multi-wavelength tunable solid-state laser tuning method according to claims 1-8, characterized in that: The following steps are involved: S1: The pump light inputs the light energy from the outside of the resonant cavity to the inside of the resonant cavity, thereby irradiating the gain crystal to induce stimulated radiation; S2: The gain crystal that induces stimulated emission releases more and more photons that reflect back and forth in the resonant cavity, while the rotating plate rotates a certain angle to make a preliminary adjustment to the wavelength of the transmitted light; S3: During the initial adjustment, the opening and closing mechanism rotates to form a hole of a certain aperture to enhance the light of a specific wavelength; S4: The enhanced light is emitted through a half mirror to form a laser.

10. A laser tuning method according to claim 9, characterized in that: In S2, the side lobes and secondary peaks in the output spectrum can be reduced by the light reflected back and forth passing through the rotating plate at a certain angle.

Images