795nm fiber laser
Through the design of all-fiber devices, the combination of seed modules, amplification modules and frequency multiplication modules is used to achieve a 795nm laser output with high output power, narrow line width and low noise, solving the difficulty of existing lasers to match the 87Rb atom D1 absorption line. Problem, and has the advantages of long life and high polarization.
Patent Information
- Application Number
- CN202322815607.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-19
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2033-10-19
AI Technical Summary
Existing 795nm lasers are difficult to output fiber lasers with high output power, narrow line width and low noise, and are particularly difficult to achieve a compressed light field that matches the 87Rb atom D1 absorption line.
The all-fiber device is adopted, and the secondary amplification and frequency doubling of seed light is achieved through the combination of seed modules, amplification modules and frequency doubling modules, and the output of 795nm laser is output. The design includes an outer cavity diode laser as a seed module, the primary and secondary amplification modules are centered on gain fiber and pump light sources, and the frequency doubling module uses periodically polarized lithium niobate ridge waveguide crystals.
Achieve a 795nm laser output with high output power, narrow line width and low noise, meeting the compressed light field requirements matching the 87Rb atom D1 absorption line, and adopts a fully polarized fiber structure with a long service life and high output polarization. compact.
Smart Images
Figure CN222483961U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of laser technology, in particular to a 795nm optical fiber laser. Background Art
[0002] 87Rb atoms have a Λ-type energy level structure and are an ideal quantum information storage medium. The wavelength of their D1 absorption line is around 795nm. With the deepening of scientific research, people not only require lasers to have high output power, narrow linewidth and good beam quality, but also require lasers to have very low intensity noise and phase noise, so as to facilitate the generation of non-classical light fields, especially compressed state light fields. The compressed state is a quantum correlation, and its compressed light can be used to construct entangled states, perform quantum teleportation, construct Schrodinger cat states in quantum networks, and perform quantum non-destructive measurements. The compressed state light field noise is lower than the standard shot noise limit and is used in optical precision measurement. Therefore, preparing the compressed state light field corresponding to the atomic absorption line and storing the quantum state of the light field in the atomic ensemble is the key to realizing the quantum information network. The preparation of a 795nm laser that matches the D1 absorption line of the 87Rb atom is an important research topic. Utility Model Content
[0003] Based on this, an embodiment of the utility model provides a 795nm fiber laser, which includes a seed module, an amplification module and a frequency doubling module; the seed module is used to output seed light; the amplification module is used to amplify the seed light; the frequency doubling module is used to make the seed light a 795nm laser after frequency doubling and amplification.
[0004] Preferably, the seed module comprises an external cavity diode laser; the external cavity diode laser outputs the seed light.
[0005] Preferably, the amplification module includes a primary amplification module and a secondary amplification module; the primary amplification module is used to gain the seed light; the secondary amplification module is used to amplify the seed light after gain according to an external pump light source; the frequency doubling module is used to make the seed light a 795nm laser after frequency doubling amplification.
[0006] Preferably, the first-stage amplification module includes an isolator, a pump stripper and a gain fiber; the isolator is used to isolate the reverse part of the seed light; the pump stripper is used to strip the residual pump light of the seed light; and the gain fiber is used to amplify the seed light in the first stage.
[0007] Preferably, the secondary amplification module includes a beam combiner, a pump light source and a filter; the pump light source is used to output a 940nm pump light; the beam combiner is used to combine the seed light after the primary amplification and the 940nm pump light into the seed light for secondary amplification; the frequency doubling module is used to frequency doubling the seed light after the secondary amplification into a 795nm laser.
[0008] Preferably, the secondary amplification module includes an amplification coupler; the amplification coupler is used for splitting and purifying the seed light after secondary amplification.
[0009] Preferably, the frequency doubling module comprises a periodically poled lithium niobate ridge waveguide crystal; the periodically poled lithium niobate ridge waveguide crystal is used for frequency doubling and amplification, and the seed light is 795nm laser.
[0010] Preferably, the frequency doubling module includes a 1560 collimator and a 780 collimator; the 1560 collimator is connected to the input of the periodically poled lithium niobate ridge waveguide crystal; the 780 collimator is connected to the output of the periodically poled lithium niobate ridge waveguide crystal.
[0011] Preferably, the frequency doubling module includes a frequency doubling coupler; the frequency doubling coupler is used for splitting and purifying the 795nm laser.
[0012] Preferably, the frequency doubling coupler is configured with an asymmetric fiber coupler splitting ratio.
[0013] Compared with the prior art, the 795 fiber laser of the utility model adopts an all-fiber device, uses an amplifier module to perform secondary amplification on the seed light and then frequency doubles to achieve the output of 795nm laser, and simultaneously adopts a full polarization-maintaining fiber structure, which has a long service life, high output polarization and a compact structure.
[0014] In view of the above-mentioned solution, the present invention provides an exemplary embodiment in detail by referring to the accompanying drawings below, so that other features and advantages of the embodiments of the present invention are also made clear. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.
[0016] Figure 1 Schematic diagram showing the structure of 795nm fiber laser
[0017] Figure 2Shows a schematic diagram of the development of a 795nm fiber laser;
[0018] Figure 3 It is a structural diagram of the amplification module;
[0019] Figure 4 This is a structural diagram of the frequency doubling module.
[0020] Figure annotation:
[0021] 1. Isolator
[0022] 2. Pump stripper
[0023] 3. Gain fiber
[0024] 4. Beam combiner
[0025] 5. Pump light source
[0026] 6. Filter
[0027] 7. Periodically polarized lithium niobate ridge waveguide crystal
[0028] 8. 1560 collimator
[0029] 9. 780 Collimator
[0030] 10. PM15 optical fiber
[0031] 11. PM780 optical fiber DETAILED DESCRIPTION
[0032] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the utility model. Instead, they are only examples of devices and methods consistent with some aspects of the utility model as detailed in the attached claims.
[0033] Figure 1 The schematic diagram of the structure of a 795nm fiber laser is shown. The 795nm fiber laser in the figure includes a seed module, an amplifier module and a frequency doubling module. The seed module is used to output seed light; the amplifier module is used to amplify the seed light at least one level; the frequency doubling module is used to make the seed light 795nm laser after frequency doubling and amplification.
[0034] The seed module includes an external cavity diode laser, which outputs seed light as an external laser source.
[0035] Figure 2The schematic diagram of the structure of the amplification module is shown. The amplification module in the figure includes a primary amplification module and a secondary amplification module. The primary amplification module is used for gain amplification of the seed light. The secondary amplification module is used for amplifying the seed light into a 795nm laser according to the external pump light beam combination.
[0036] Figure 3 The schematic diagram of the structure of the first-stage amplification module is shown. In the figure, the first-stage amplification module includes an isolator 1, a pump stripper 2, and a gain optical fiber 3.
[0037] The isolator 1 is a 1x2 optical fiber isolator 1, which isolates the reverse part of the seed light.
[0038] Preferably, the isolator 1 has an asymmetric fiber coupler splitting ratio, which may be 99:1, 98:2, 97:3 or other asymmetric splitting ratios.
[0039] The pump stripper 2 is used to strip the residual pump light of the seed light.
[0040] Among them, the gain fiber 3 is a rare earth doped special fiber such as erbium and ytterbium co-doped, which performs a first-stage amplification on the seed light.
[0041] Figure 3 The schematic diagram of the structure of the secondary amplification module is shown in FIG. The secondary amplification module in the figure includes a beam combiner 4, a pump light source, a filter 6 and an amplification coupler.
[0042] The pump light source is a multi-mode pump semiconductor laser with a central wavelength of 940nm.
[0043] Among them, one input end 5.1 of the beam combiner 4 inputs the output of the 940nm multi-mode pump semiconductor laser, the other input end 5.2 inputs the seed light after primary amplification, and the output end 5.3 outputs the seed light after secondary amplification.
[0044] The filter 6 is a 1x1 optical fiber device used for filtering the seed light.
[0045] Preferably, the filter 6 has an asymmetric fiber coupler splitting ratio, which may be 99:1, 98:2, 97:3 or other asymmetric splitting ratios.
[0046] Among them, the amplification coupler is a 1x2 fiber coupler, which is used to split and purify the seed light after secondary amplification.
[0047] In some embodiments, the gain fiber 3 may be disposed behind the beam combiner 4 , and the seed light of the secondary amplification output by the beam combiner 4 is input into the gain fiber 3 for further amplification.
[0048] Figure 4The structural schematic diagram of the frequency doubling module is shown. The figure shows that the frequency doubling module includes PM15 optical fiber 10, 1560 collimator 8, periodically poled lithium niobate ridge waveguide crystal 7, 780 collimator 9, PM780 optical fiber 11, and a frequency doubling coupler.
[0049] The seed light of the secondary amplification passes through PM15 optical fiber 10 and 1560 collimator 8, and then enters the periodically polarized lithium niobate ridge waveguide crystal 7 for frequency doubling amplification, and then passes through 780 collimator 9 and PM780, and then outputs through the frequency doubling coupler. The frequency doubling coupler is used to split and purify the 795nm laser.
[0050] Preferably, the frequency doubling coupler is a 1x2 optical fiber coupler.
[0051] Preferably, the frequency doubling coupler has an asymmetric fiber coupler splitting ratio, which may be 99:1, 98:2, 97:3 or other asymmetric splitting ratios.
[0052] Based on this, the utility model 795 fiber laser adopts all-fiber devices, uses an amplifier module to perform secondary amplification on the seed light and then frequency doubles to achieve the output of 795nm laser, and uses a full polarization-maintaining fiber structure, which has a longer service life, higher output polarization, and a more compact structure.
[0053] Based on this understanding, the technical solution of the utility model can essentially or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of each embodiment of the utility model.
[0054] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A 795nm fiber laser, characterized in that: The fiber laser includes a seed module, an amplification module and a frequency doubling module; The seed module is used to output seed light; The amplification module is used to amplify the seed light; The frequency doubling module is used to make the seed light a 795nm laser after frequency doubling and amplification.
2. The 795nm fiber laser according to claim 1, characterized in that: The seed module includes an external cavity diode laser; The external cavity diode laser outputs the seed light.
3. The 795nm fiber laser according to claim 1, characterized in that: The amplification module includes a primary amplification module and a secondary amplification module; The first-stage amplification module is used to gain the seed light; The secondary amplification module is used to amplify the seed light after gain according to the external pump light source; the frequency doubling module is used to make the seed light a 795nm laser after frequency doubling amplification.
4. The 795nm fiber laser according to claim 3, characterized in that: The first-stage amplification module includes an isolator, a pump stripper and a gain optical fiber; The isolator is used to isolate the reverse part of the seed light; The pump stripper is used to strip residual pump light from the seed light; The gain optical fiber is used for first-stage amplification of the seed light.
5. The 795 nm fiber laser according to claim 3, characterized in that: The secondary amplification module includes a beam combiner, a pump light source and a filter; The pump light source is used to output 940nm pump light; The beam combiner is used to combine the seed light after primary amplification and the 940nm pump light into the seed light after secondary amplification; The frequency doubling module is used to frequency-double the seed light after secondary amplification to obtain a 795nm laser.
6. The 795 nm fiber laser according to claim 5, characterized in that: The secondary amplification module includes an amplification coupler; The amplifying coupler is used for splitting and purifying the seed light after secondary amplification.
7. The 795 nm fiber laser according to claim 1, characterized in that: The frequency doubling module includes a periodically poled lithium niobate ridge waveguide crystal; The periodically polarized lithium niobate ridge waveguide crystal is used for frequency doubling and amplification, and the seed light is 795nm laser.
8. The 795 nm fiber laser according to claim 7, characterized in that: The frequency doubling module includes a 1560 collimator and a 780 collimator; The 1560 collimator is connected to the input of the periodically poled lithium niobate ridge waveguide crystal; The 780 collimator is connected to the output of the periodically poled lithium niobate ridge waveguide crystal.
9. The 795 nm fiber laser according to claim 1, characterized in that: The frequency multiplication module includes a frequency multiplication coupler; The frequency doubling coupler is used for splitting and purifying the 795nm laser.
10. The 795 nm fiber laser according to claim 9, characterized in that: The frequency doubling coupler is configured with an asymmetric fiber coupler splitting ratio.