CN103647215A - Narrow-line-width high-power external cavity laser - Google Patents

Abstract

A narrow-linewidth high-power external cavity laser, with light holes processed on both side walls of the box, an optical amplification chip in the middle of the bottom of the box, and a second collimating mirror on the left side of the light amplification chip at the bottom of the box. Diffraction grating is set on the left side of the second collimating mirror at the bottom of the box, and a piezoelectric transducer is set on the left end of the bottom of the box. A first collimating mirror is set in the direction, a cylindrical lens is set in the light exit direction on the right side of the first collimating mirror at the bottom of the box, and a top cover is set on the top of the box. Since the present invention adopts an optical amplifier chip to generate and amplify the laser, and combines the laser amplifier system and the laser system, the volume of the system used to generate high-power laser is greatly reduced, the reliability and stability of the laser are improved, and the laser power is reduced. Product Cost. The invention can be applied in technical fields such as atom cooling and long-distance optical information transmission.

Description

Narrow linewidth high power external cavity laser

technical field

The invention belongs to the technical field of lasers, and in particular relates to an optical amplifier chip laser device.

Background technique

Lasers are widely used in the fields of quantum frequency standards, atomic physics, fundamental physics, and biomedicine. Especially in the fields of long-distance optical fiber communication, laser cooling and trapping of atoms, and fountain clocks, it is required that the laser can output laser with high power and stable center frequency, which requires that the laser can not only generate high-power laser but also have a relatively high frequency. Good stability and reliability.

The output laser power of the traditional laser is low, so it can only generate low-power laser through the laser first, and then realize the amplification of the laser power through the optical amplifier system, which requires the laser system to be used in conjunction with the optical amplifier system, which is virtually Increasing the number of optical components used not only increases the system cost, but also increases the complexity of the system and the workload of operators, which reduces the reliability and stability of the system to a certain extent.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned lasers, and provide a narrow linewidth and high-power external cavity laser with miniaturization, low cost and good reliability.

The technical solution adopted to solve the above technical problems is as follows: light holes are processed on the left and right side walls of the box body, an optical amplification chip is arranged in the middle of the bottom of the box body, and a second standard is set on the left side of the light amplification chip at the bottom of the box body in the direction of light emission. Straight mirror, the second collimating mirror at the bottom of the cabinet is provided with a diffraction grating in the light exit direction on the left side, a piezoelectric transducer is provided at the left end of the bottom of the cabinet, and a total reflection mirror is provided on the right end of the piezoelectric transducer. A first collimating mirror is arranged on the right side of the light amplification chip at the bottom in the light emitting direction, a cylindrical lens is arranged on the right side of the first collimating mirror at the bottom of the cabinet, and a top cover is arranged on the top of the cabinet.

The first collimating mirror and the second collimating mirror of the present invention are double-convex lenses, and the curvature radius of the left convex surface and the right convex surface of the double-convex lens is 3-6 mm, and 12-18 layers of zirconium dioxide or zirconium dioxide are vacuum-deposited on the mirror surface of the double-convex lens. Silica AR coating. The diffraction grating of the present invention has a bandwidth of 100 GHz, a groove density of 400-600 l/mm or a transmittance of 85%-95%. The relative permittivity of the piezoelectric transducer of the present invention is 1600, the mechanical quality factor is 80, the electromechanical coupling coefficient is 0.35, and the piezoelectric strain constant is 300. The total reflection mirror of the present invention is a plane mirror, and 2 to 8 layers of aluminum oxide and silicon dioxide total reflection films are alternately evaporated in vacuum on the mirror surface of the total reflection mirror. The cylindrical lens of the present invention is a plano-convex mirror, the left end face of the plano-convex mirror is a plane, the right end face is a convex surface, the radius of curvature of the convex surface is 14-18 mm, and 10-16 layers of zirconium dioxide or dioxane are vacuum deposited on the mirror surface of the cylindrical lens. Silicon oxide AR coating.

The first collimating mirror and the second collimating mirror of the present invention are double-convex lenses, and the curvature radius of the left convex surface and the right convex surface of the double-convex lens is optimally 4.5 mm, and vacuum evaporation of 14 layers of zirconium dioxide is optimal on the mirror surface of the double-convex lens or silica AR coating. Diffraction grating of the present invention is: bandwidth is 100GHz, groove line density is the best 500l/mm or transmittance is 90%, the relative permittivity of piezoelectric transducer of the present invention is 1600, and mechanical quality factor is 80, The electromechanical coupling coefficient is 0.35, and the piezoelectric strain constant is 300. The total reflection mirror of the present invention is a plane mirror, and the vacuum alternate evaporation on the mirror surface of the total reflection mirror preferably has 4 layers of aluminum oxide and silicon dioxide total reflection films. The cylindrical lens of the present invention is a plano-convex mirror, the left end face of the plano-convex mirror is a plane, and the right end face is a convex surface. Silicon oxide AR coating.

The first collimating mirror and the second collimating mirror of the present invention are double-convex lenses, and the curvature radius of the left convex surface and the right convex surface of the double-convex lens is the same, and 12 to 18 layers of zirconium dioxide or silicon dioxide are vacuum-deposited on the mirror surface of the double-convex lens. AR coating.

The first collimating mirror and the second collimating mirror of the present invention are double-convex lenses, and the radius of curvature of the left convex surface and the right convex surface of the second collimating mirror and the material and number of layers of the anti-reflection coating are the same as those of the first collimating mirror .

Since the present invention adopts an optical amplifier chip to generate and amplify laser light, and combines the laser amplifier system with the laser system, the volume of the system used to generate high-power laser is greatly reduced, the reliability and stability of the laser are improved, and the laser power is reduced. Product Cost. The invention has the advantages of simple structure, small volume, low product cost, good reliability and stability, etc., and can be applied in technical fields such as atom cooling and long-distance optical information transmission.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

Example 1

In Fig. 1, the narrow-linewidth high-power external-cavity laser of this embodiment consists of a cylindrical lens 1, a first collimating mirror 2, an optical amplification chip 3, a second collimating mirror 4, a diffraction grating 5, a total reflection mirror 6, a compression The electric transducer 7, the top cover 8, and the box body 9 are connected to form.

The left and right side walls of the box body 9 are processed with light holes, and the bottom center of the box body 9 is fixedly connected with a threaded fastening connector to install an optical amplifier chip 3. The optical amplifier chip 3 is a commodity sold on the market, and the model is EYP-TPA-0850-00500-3006-cmt03-000, produced by German EAGLEYARD company, the optical amplifier chip 3 generates laser light with a center wavelength of 850nm as the seed light, and the left side of the optical amplifier chip 3 at the bottom of the box 9 emits light In the direction, a second collimating mirror 4 is fixedly connected with a threaded fastening connector, and the second collimating mirror 4 is a double-convex lens. 14 layers of zirconium dioxide anti-reflection coatings are vacuum-deposited on the mirror surface. On the left side of the second collimating mirror 4 at the bottom of the box 9 in the direction of light emission, a diffraction grating 5 is fixedly connected with a threaded fastening connector. The rate is 90%. A piezoelectric transducer 7 is fixedly installed on the left end of the bottom of the box body 9 with a threaded fastening connector. The relative dielectric constant of the piezoelectric transducer 7 is 1600, the mechanical quality factor is 80, and the electromechanical coupling coefficient is 0.35. Strain constant 300. The piezoelectric transducer 7 is used to generate axial deformation. The right end surface of the piezoelectric transducer 7 is bonded with a total reflection mirror 6. The total reflection mirror 6 is a plane mirror. The vacuum on the mirror surface of the total reflection mirror 6 is alternately evaporated. Coated with 4 layers of aluminum oxide and silicon dioxide full reflection film. The optical amplifier chip 3 is connected to the power supply to generate laser light, which is used as seed light. The seed light is emitted from the left end of the optical amplifier chip 3, and is shaped into an elliptical beam through the second collimating mirror 4, and is incident on the diffraction grating 5. By changing The angle of the diffraction grating 5 is used to select the mode of the seed light. The seed light after mode selection is incident on the total reflection mirror 6, and the total reflection mirror 6 and the left laser emission end surface of the optical amplifier chip 3 form a laser resonant external cavity to obtain laser light with a narrow linewidth. The seed light is reflected by the total reflection mirror 6 according to the original optical path and enters the optical amplification chip 3 for amplification.

The first collimator mirror 2 is fixedly connected with the threaded fastening connector on the right side light exit direction of the light amplification chip 3 at the bottom of the casing 9, and the first collimator mirror 2 is a double-convex lens, and the left convex surface of the double-convex lens and The radius of curvature of the right convex surface is 4.5 mm, and 14 layers of zirconium dioxide anti-reflection coatings are vacuum-evaporated on the mirror surface of the first collimating mirror 2 . On the right side light exit direction of the first collimating mirror 2 at the bottom of the casing 9, a cylindrical lens 1 is fixedly connected with a threaded fastening connector, and the cylindrical lens 1 is a plano-convex lens. It is a convex surface, and the radius of curvature of the convex surface is 15 mm. On the mirror surface of the cylindrical lens 1, 14 layers of zirconia are vacuum-deposited. The material for making the cylindrical lens 1 is N-BK7. The top of the box body 9 is fixedly connected with a screw fastening connector Top cover 8, top cover 8 is processed with duralumin.

Example 2

On the left side light exit direction of the light amplification chip 3 at the bottom of the casing 9, a second collimating mirror 4 is fixedly connected with a threaded fastening connector, and the second collimating mirror 4 is a double-convex lens, and the left convex surface of the double-convex lens and The radius of curvature of the right convex surface is 3 mm, and 12 layers of zirconium dioxide anti-reflection coatings are vacuum-evaporated on the mirror surface of the second collimating mirror 4 . On the left side of the second collimating mirror 4 at the bottom of the box 9 in the direction of light emission, a diffraction grating 5 is fixedly connected with a threaded fastening connector. The rate is 85%. A total reflection mirror 6 is glued on the right end surface of the piezoelectric transducer 7. The total reflection mirror 6 is a plane mirror. Two layers of aluminum oxide and silicon dioxide are alternately vacuum-evaporated on the mirror surface of the total reflection mirror 6. Full reflection film.

The first collimator mirror 2 is fixedly connected with the threaded fastening connector on the right side light exit direction of the light amplification chip 3 at the bottom of the casing 9, and the first collimator mirror 2 is a double-convex lens, and the left convex surface of the double-convex lens and The radius of curvature of the right convex surface is 4 mm, and 12 layers of zirconium dioxide anti-reflection coatings are vacuum-evaporated on the mirror surface of the first collimating mirror 2 . On the right side light exit direction of the first collimating mirror 2 at the bottom of the casing 9, a cylindrical lens 1 is fixedly connected with a threaded fastening connector, and the cylindrical lens 1 is a plano-convex lens. It is a convex surface, and the radius of curvature of the convex surface is 14. The mirror surface of the cylindrical lens 1 is vacuum-evaporated with 10 layers of zirconium dioxide anti-reflection coating.

Other components and the coupling relationship of the components are the same as in Embodiment 1.

Example 3

On the left side light exit direction of the light amplification chip 3 at the bottom of the casing 9, a second collimating mirror 4 is fixedly connected with a threaded fastening connector, and the second collimating mirror 4 is a double-convex lens, and the left convex surface of the double-convex lens and The radius of curvature of the right convex surface is 6 mm, and 18 layers of zirconium dioxide anti-reflection coatings are vacuum-evaporated on the mirror surface of the second collimating mirror 4 . On the left side of the second collimating mirror 4 at the bottom of the box 9 in the direction of light emission, a diffraction grating 5 is fixedly connected with a screw fastening connector. The rate is 95%. A total reflection mirror 6 is glued on the right end surface of the piezoelectric transducer 7, the total reflection mirror 6 is a plane mirror, and 8 layers of aluminum oxide and silicon dioxide are alternately vacuum-evaporated on the mirror surface of the total reflection mirror 6 Full reflection film.

The first collimator mirror 2 is fixedly connected with the threaded fastening connector on the right side light exit direction of the light amplification chip 3 at the bottom of the casing 9, and the first collimator mirror 2 is a double-convex lens, and the left convex surface of the double-convex lens and The radius of curvature of the right convex surface is 6 mm, and 18 layers of zirconium dioxide anti-reflection coatings are vacuum-evaporated on the mirror surface of the first collimating mirror 2 . On the right side light exit direction of the first collimating mirror 2 at the bottom of the casing 9, a cylindrical lens 1 is fixedly connected with a threaded fastening connector, and the cylindrical lens 1 is a plano-convex lens. It is a convex surface, and the radius of curvature of the convex surface is 18mm. The mirror surface of the cylindrical lens 1 is vacuum-evaporated with 16 layers of zirconium dioxide anti-reflection coating.

Other components and the coupling relationship of the components are the same as in Embodiment 1.

Example 4

In the above embodiments 1-3, the anti-reflection film vacuum-evaporated on the mirror surfaces of the first collimator mirror 2 and the second collimator mirror 4 is silicon dioxide, and the number of layers of the anti-reflection film is the same as that of the corresponding embodiment same. The anti-reflection film vacuum-evaporated on the mirror surface of the cylindrical lens 1 is a silicon dioxide anti-reflection film, and the number of vacuum-evaporated layers is the same as that in the corresponding embodiment. Other components and the coupling relationship of the components are the same as in Embodiment 1.

The working principle of the present invention is as follows:

The optical amplifier chip 3 is connected to the power supply to generate laser light, which is used as seed light. The seed light is emitted from the left end of the optical amplifier chip 3, and is shaped into an elliptical beam through the second collimating mirror 4, and is incident on the diffraction grating 5. By changing The angle of the diffraction grating 5 is used to select the mode of the seed light. The seed light after mode selection is incident on the total reflection mirror 6, and the total reflection mirror 6 and the left laser emission end surface of the optical amplifier chip 3 form a laser resonant external cavity to obtain laser light with a narrow linewidth. The seed light is reflected by the total reflection mirror 6 according to the original optical path and enters the optical amplification chip 3 for amplification. The amplified laser light exits from the right end of the optical amplification chip 3, and is shaped into a laser beam with an elliptical cross-section by the first collimating mirror 2, and then shaped into a circular laser beam with a circular cross-section by the cylindrical lens 1. 9 side exit holes shoot out.

Claims (5)

1. A narrow-linewidth high-power external cavity laser, characterized in that: light holes are processed on the left and right side walls of the box (9), and an optical amplifier chip (3) is arranged in the middle of the bottom of the box (9). (9) The bottom light amplifier chip (3) is provided with a second collimator mirror (4) in the left light exit direction, and the second collimator mirror (4) at the bottom of the box (9) is provided with a diffraction grating in the left light exit direction (5), the left end of the bottom of the box (9) is provided with a piezoelectric transducer (7), the right end of the piezoelectric transducer (7) is provided with a total reflection mirror (6), and the light at the bottom of the box (9) is amplified The first collimating mirror (2) is installed on the right side of the chip (3) in the direction of light emission, and the first collimator (2) at the bottom of the box (9) is provided with a cylindrical lens (1) in the direction of light emission on the right side, and the box ( 9) is provided with a top cover (8). 2. The narrow-linewidth high-power external cavity laser according to claim 1, characterized in that: the first collimating mirror (2) and the second collimating mirror (4) are double-convex lenses, and the left convex surface of the double-convex lens and the radius of curvature of the right convex surface is 3-6 mm, and 12-18 layers of zirconium dioxide or silicon dioxide anti-reflection coatings are vacuum-deposited on the mirror surface of the biconvex lens; the diffraction grating (5) is: a bandwidth of 100 GHz, a groove The density is 400-600l/mm or the transmittance is 85%-95%; the relative permittivity of the piezoelectric transducer (7) is 1600, the mechanical quality factor is 80, the electromechanical coupling coefficient is 0.35, and the piezoelectric The strain constant is 300; the total reflection mirror (6) is a flat mirror, and 2 to 8 layers of aluminum oxide and silicon dioxide total reflection films are alternately vacuum-evaporated on the mirror surface of the total reflection mirror (6); the column The lens (1) is a plano-convex mirror, the left end face of the plano-convex mirror is flat, the right end face is convex, and the radius of curvature of the convex face is 14-18mm, and 10-16 layers of zirconium dioxide are vacuum-deposited on the mirror surface of the cylindrical lens (1) or silica AR coating. 3. The narrow-linewidth high-power external cavity laser according to claim 1, characterized in that: the first collimating mirror (2) and the second collimating mirror (4) are double-convex lenses, and the left convex surface of the double-convex lens and the radius of curvature of the right convex surface is 4.5mm, and 14 layers of zirconium dioxide or silicon dioxide anti-reflection coatings are vacuum-evaporated on the mirror surface of the double-convex lens; the diffraction grating (5) described is: the bandwidth is 100GHz, and the groove density is 500l /mm or a transmittance of 90%; the relative permittivity of the piezoelectric transducer (7) is 1600, the mechanical quality factor is 80, the electromechanical coupling coefficient is 0.35, and the piezoelectric strain constant is 300; the full The reflecting mirror (6) is a flat mirror, and 4 layers of aluminum oxide and silicon dioxide total reflection films are alternately vacuum-evaporated on the mirror surface of the total reflecting mirror (6); the cylindrical lens (1) is a plano-convex mirror, flat The left end surface of the convex mirror is flat, the right end surface is convex, and the radius of curvature of the convex surface is 15 mm. On the mirror surface of the cylindrical lens (1), 14 layers of zirconium dioxide or silicon dioxide anti-reflection coatings are vacuum-evaporated. 4. The narrow-linewidth high-power external cavity laser according to claim 2, characterized in that: the first collimating mirror (2) and the second collimating mirror (4) are double-convex lenses, and the left convex surface of the double-convex lens The radius of curvature is the same as that of the right convex surface, and 12 to 18 layers of zirconium dioxide or silicon dioxide anti-reflection coatings are vacuum-deposited on the mirror surface of the double-convex lens. 5. The narrow-linewidth high-power external cavity laser according to claim 2, characterized in that: the first collimating mirror (2) and the second collimating mirror (4) are biconvex lenses, and the second collimating mirror The radius of curvature of the left convex surface and the right convex surface of (4) and the material and number of layers of the coated anti-reflection coating are the same as those of the first collimating mirror (2).

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