CN214044330U - Single-tube blue-light semiconductor laser external cavity device - Google Patents
Single-tube blue-light semiconductor laser external cavity device Download PDFInfo
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- CN214044330U CN214044330U CN202022895855.9U CN202022895855U CN214044330U CN 214044330 U CN214044330 U CN 214044330U CN 202022895855 U CN202022895855 U CN 202022895855U CN 214044330 U CN214044330 U CN 214044330U
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Abstract
The utility model discloses a single tube blue light semiconductor laser exocoel device belongs to semiconductor laser technical field. The laser diode comprises a blue light diode base with a water cooling device, a blue light diode, an angle-adjustable plane mirror fixing seat, an angle-adjustable grating fixing seat, a blazed grating, a plane mirror, an aspheric collimating mirror, a cylindrical lens, a focusing lens and an optical fiber, wherein a laser diode interface is arranged on one side of the blue light diode base, the blue light diode is fixed in the base through the interface, the aspheric collimating mirror is fixed on the right side of the blue light diode, a circuit board is arranged on the other side of the blue light diode base and used for connecting the blue light diode and a power supply, the problem that the direction of an output light beam of the Littrow type ECDL changes along with the rotation of the grating can be effectively solved, the initial distance between the plane mirror and the grating is reduced, the transverse displacement of the output light beam can be reduced, and the mode-hop-free tuning range is enlarged.
Description
Technical Field
The utility model belongs to the technical field of semiconductor laser, specifically be a single tube blue light semiconductor laser exocoel device.
Technical Field
The single-tube blue-light semiconductor laser external cavity feedback is that a part of output light of the LD is fed back to the LD through frequency-selecting elements (such as blazed gratings, fiber gratings, volume Bragg gratings, interference filters and the like) outside an LD cavity of the single-tube blue-light semiconductor laser, and the performance of the LD is improved through the interaction of a feedback light field and a light field in the LD cavity, so that the stability of the output wavelength of the laser can be improved, and the working characteristics of no mode-hopping tuning, narrow line width, single longitudinal mode output and the like can be realized. The external cavity semiconductor laser is more attractive than a free running LD due to the improvement of frequency stability, tunability and spectral purity, the line width of a single-mode LD is generally 10-30MHz, the output line width of an ECDL (external cavity semiconductor laser) of the external cavity semiconductor laser with an external grating forming the external cavity can be reduced to be below 1MHz, and the external cavity semiconductor laser is widely used for the fields of isotope movement or hyperfine structure constant determination, sensing, high-resolution spectroscopy, atomic physics and the like.
The currently commonly used ECDL is mainly of a Littrow structure, emitted light of a semiconductor laser of the Littrow structure is collimated by a lens and enters a grating, and after the light passes through a grating mode selection, first-order diffracted light returns along an incident light path and is injected into an LD active region as feedback light, so that the gain of the selected mode in an inner cavity of the laser is amplified, and the mode competition is favored. However, the variation of the output beam with the wavelength tuning is a disadvantage of the Littrow structure, the quality of the output light spot is poor, and the output line width of the blue diode increases with the increase of the temperature, so that improvement is needed.
Disclosure of Invention
An object of the utility model is to provide a single tube blue light semiconductor laser exocoel device to the problem that the output beam that proposes changes, the light beam quality is poor along with wavelength tuning in solving above-mentioned technical background.
In order to achieve the above object, the patent of the utility model provides a following technical scheme: a single-tube blue-light semiconductor laser external cavity device comprises an aspheric collimating mirror, a blue-light diode base, a grating fixing seat, a plane mirror fixing seat, a blazed grating, a column lens a, a column lens b, a focusing lens and a coupling optical fiber, wherein a laser diode interface is arranged on one side of the blue-light diode base, the blue-light diode is fixed in the blue-light diode base through the interface, the aspheric collimating mirror is fixed on the right side of the blue-light diode, a circuit board is arranged on the other side of the blue-light diode base and used for connecting the blue-light diode with a power supply, and round holes are chiseled in the top, the bottom and the left side of the blue-light diode base and used for communicating an external water cooler; the blazed grating is fixed on the upper side of the grating fixing seat; the plane mirror is fixed on the upper side of the plane mirror fixing seat; after being collimated by the aspherical mirror, light beams emitted by the blue light diode are compressed in line width by the blazed grating, are reflected by the plane mirror, are shaped by the cylindrical lens a and the cylindrical lens b, are focused by the focusing lens, and are finally coupled into the coupling optical fiber.
Preferably, the single-tube blue-light semiconductor laser external cavity device adopts a plane mirror-grating external cavity structure, the problem that the direction of an output light beam of the Littrow type ECDL is changed along with the rotation of the grating can be effectively solved, the initial distance between the plane mirror and the grating is reduced, the transverse displacement of the output light beam can be reduced, and the mode-hopping-free tuning range can be enlarged.
Preferably, the blue light diode base adopt the better copper product material of heat dispersion, the upside and the downside of base are equipped with water pipe connection for connect outside water-cooled generator, inside chisel has circular passageway to rivers form the return circuit wherein, reach the effect of continuously cooling, thereby greatly reduced the influence of temperature variation to blue laser output linewidth.
Preferably, the plane mirror fixing seat or the grating fixing seat is a design structure with an adjustable rotation angle, and is provided with an angle fine adjustment knob so as to accurately adjust the Littrow angle.
Preferably, an antireflection film is plated at the light emitting end of the LD tube core of the blue light diode to improve the external cavity feedback efficiency and further improve the output power of the ECDL.
Preferably, in order to further optimize the quality of the output light beam of the ECDL system, the single-tube blue-light semiconductor laser external cavity device compresses the fast axis and the slow axis of the light spot by using two cylindrical lenses, and couples the compressed light spot into the coupling optical fiber by using the focusing lens for homogenization.
The utility model has the advantages that: the adoption of a plane mirror-grating external cavity structure can effectively solve the problem that the direction of an output beam of the Littrow-type ECDL changes along with the rotation of the grating, reduce the initial distance between the plane mirror and the grating, reduce the transverse displacement of the output beam and enlarge the mode-hopping-free tuning range.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention;
FIG. 2 is a schematic view of the structure of the "plane mirror-blazed grating" of the present invention;
fig. 3 is a front view of the blue light diode base of the present invention;
fig. 4 is a front view of the plane mirror-grating fixing base of the present invention;
FIG. 5 is a cross-sectional view of the internal structure of a blue-light diode.
In the figure: 1 is a water pipe; 2 is an aspheric collimating lens; 3 is a blue light diode; 4 is a circuit board; 5 is a blue light diode base; 6 is a grating fixing seat; 7 is a plane mirror; 8 is a plane mirror fixing seat; 9 is a blazed grating; 10 is a cylindrical lens a; 11 is a cylindrical lens b; 12 is a focusing lens; 13 is a coupling fiber; 14 is a water flow channel; 15 is a blue light diode interface; 16 is a water cooling machine; 17 is a grating-plane mirror fixing frame; 18 is a rotating layer; 19 is a fixed layer; 20 is an angle fine adjustment knob; 21 is a scale; 22 is a metal pipe cap; 23 is a metal tube seat; 24 is an LD die; and 25 is a pin.
Detailed description of the preferred embodiments
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention:
referring to fig. 1 and 3, the overall structure of the single-tube blue-light semiconductor laser external cavity device includes an aspheric collimating mirror 2, a blue-light diode 3, a blue-light diode base 5, a grating fixing base 6, a plane mirror 7, a plane mirror fixing base 8, a blazed grating 9, a cylindrical lens a10, a cylindrical lens b11, a focusing lens 12, and a coupling fiber 13. A laser diode interface 15 is arranged on one side of the blue-light two-machine tube base 5, the blue-light diode 3 is fixed in the blue-light diode base 5 through the interface, the aspheric collimating lens 2 is fixed on the right side of the blue-light diode 3, a circuit board is arranged on the other side of the blue-light diode base 5 and used for connecting the blue-light diode 3 with a power supply, and round holes are chiseled in the top, the bottom and the left side of the blue-light diode base 5 and used for being communicated with an external water cooler 16; the blazed grating 9 is fixed on the upper side of the grating fixing seat 6; the plane mirror 7 is fixed on the upper side of the plane mirror fixing seat 8; the light beam emitted by the blue light diode 3 is collimated by the aspherical mirror 2, the line width is compressed by the blazed grating 6, the light beam is reflected by the plane mirror 7, the light beam is shaped by the cylindrical lens a10 and the cylindrical lens b11, and the light beam is focused by the focusing lens 12 and is finally coupled into the coupling optical fiber 13.
Referring to fig. 2, the "plane mirror-grating" external cavity structure includes a blue light diode 3, an aspheric collimating mirror 2, a plane mirror 7, and a blazed grating 9, wherein laser light is divided into two diffracted lights after passing through the blazed grating 9, wherein the first-order diffracted light returns to the blue light diode 3 to form external cavity feedback, and the zero-order diffracted light is used as output light.
Referring to fig. 4, the flat mirror and the grating fixing base include a grating-flat mirror fixing frame 17, a rotating layer 18, a fixing layer 19, an angle fine adjustment knob 20, and a scale 21. The grating-plane mirror fixing frame is fixed on the rotating layer, and the angles of the plane mirror and the grating can be accurately controlled by adjusting the angle fine adjustment knob 20 and rotating the rotating layer 18.
Referring to fig. 5, the internal structure of the blue light diode includes a metal cap 22, a metal tube seat 23, an LD tube core 24, and a lead 25, and an antireflection film is plated on one side of a light emitting port of the LD tube core 24, so that the external cavity feedback efficiency can be greatly improved.
The single-tube blue-light semiconductor laser external cavity device adopts an external cavity structure of the plane mirror 7-blazed grating 9, can effectively solve the problem that the direction of an output light beam of the Littrow type ECDL changes along with the rotation of the blazed grating 9, reduces the initial distance between the plane mirror 7 and the blazed grating 9, can reduce the transverse displacement of the output light beam, and can also increase the mode hopping-free tuning range.
Blue light diode base 5 adopt the better copper product material of heat dispersion, the upside and the downside of base 5 are equipped with water pipe connection for connect outside water-cooled generator 16, inside chisel has circular passageway, so that rivers form the return circuit wherein, reach the effect of continuously cooling, thereby greatly reduced the influence of temperature variation to blue laser output linewidth.
The plane mirror 7 fixing seats are designed with adjustable rotation angles and are provided with angle fine adjustment knobs, so that the Littrow angle can be accurately adjusted.
And the light-emitting end of the LD tube core of the blue light diode 3 is plated with an antireflection film so as to improve the external cavity feedback efficiency and further improve the output power of the ECDL system.
The single-tube blue-light semiconductor laser external cavity device adopts two cylindrical lenses, namely
Cylindrical lens a10 and cylindrical lens b11 compress the fast axis and slow axis directions of the spot, respectively, and couple it into the coupling fiber 13 with the focusing lens 12 for homogenization.
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (6)
1. The single-tube blue-light semiconductor laser external cavity device is characterized by comprising a blue-light diode base with a water cooling device, a blue-light diode, an angle-adjustable plane mirror fixing base, an angle-adjustable grating fixing base, a blazed grating, a plane mirror, an aspheric collimating mirror, a cylindrical lens, a focusing lens and a coupling optical fiber, wherein a laser diode interface is arranged on one side of the blue-light diode base; the blazed grating is fixed on the upper side of the grating fixing seat; the plane mirror is fixed on the upper side of the plane mirror fixing seat; and light beams emitted by the blue light diode pass through the aspheric collimating mirror, then are compressed by the blazed grating to be wide, are reflected by the plane mirror, are shaped by the cylindrical lens and are focused by the focusing lens, and finally are coupled into the coupling optical fiber.
2. The single-tube blue-light semiconductor laser external cavity device according to claim 1, wherein said single-tube blue-light semiconductor laser external cavity device adopts a plane mirror and grating external cavity structure.
3. The external cavity device of a single-tube blue-light semiconductor laser as claimed in claim 2, wherein the blue-light diode base is made of copper material, water pipe connectors are arranged on the upper side and the lower side of the base for connecting with an external water cooling machine, and a circular channel is chiseled inside the base.
4. The single-tube blue-light semiconductor laser external cavity device according to claim 3, wherein the plane mirror fixing seats are both of design structures with adjustable rotation angles, and are provided with angle fine adjustment knobs so as to accurately adjust the Littrow angle.
5. The external cavity device of a single-tube blue-light semiconductor laser as claimed in claim 4, wherein an anti-reflection film is coated on a light emitting end of the LD die of the blue light diode.
6. The single-tube blue-light semiconductor laser external cavity device according to claim 5, wherein the single-tube blue-light semiconductor laser external cavity device compresses the light spots in the fast axis direction and the slow axis direction respectively by using two cylindrical lenses, and couples the compressed light spots into the coupling optical fiber for homogenization by using the focusing lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022895855.9U CN214044330U (en) | 2020-12-07 | 2020-12-07 | Single-tube blue-light semiconductor laser external cavity device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022895855.9U CN214044330U (en) | 2020-12-07 | 2020-12-07 | Single-tube blue-light semiconductor laser external cavity device |
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| CN214044330U true CN214044330U (en) | 2021-08-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114813050A (en) * | 2022-04-14 | 2022-07-29 | 华中科技大学 | Multimode blue light single tube laser mode measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114813050A (en) * | 2022-04-14 | 2022-07-29 | 华中科技大学 | Multimode blue light single tube laser mode measuring device |
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