CN115693358A - Wavelength-tunable single-frequency optical fiber amplifier with seed optical space coupling - Google Patents
Wavelength-tunable single-frequency optical fiber amplifier with seed optical space coupling Download PDFInfo
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- CN115693358A CN115693358A CN202211298188.3A CN202211298188A CN115693358A CN 115693358 A CN115693358 A CN 115693358A CN 202211298188 A CN202211298188 A CN 202211298188A CN 115693358 A CN115693358 A CN 115693358A
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Abstract
The invention relates to a seed optical space coupling wavelength tunable single-frequency optical fiber amplifier, belongs to the field of optics, and mainly solves the problem of narrow wavelength tuning bandwidth of a high-power single-frequency laser. The seed source adopts Yb with temperature tuning, namely a YAG non-planar circulator; in order to prevent the reverse spontaneous radiation of the gain fiber from damaging seed source devices, an optical isolator is added between the seed source and the fiber amplification system; in order to improve the coupling efficiency of the seed light to the optical fiber amplification system, the seed light coupling injection system adopts a combination of a convex lens and an aspheric lens, and the seed light is injected into a signal input fiber of the pump beam combiner; in order to improve the pump coupling efficiency of the optical fiber amplification system and obtain high-power output, the gain optical fiber adopts a double-cladding ytterbium-doped optical fiber. The laser can stably output 1031nm continuous single-frequency laser with the line width of more than 10W, the laser line width is less than or equal to 20kHz, and the wavelength tuning bandwidth is 0.4nm; the seed optical coupling efficiency is more than or equal to 60 percent, and the amplification gain of the optical fiber amplification system is 21dB.
Description
Technical Field
The invention belongs to the field of optics and laser design technology, and relates to a seed light space coupling wavelength tunable single-frequency optical fiber amplifier.
Background
With the increasing demand of the combat ability of the new generation of fighters, the laser ranging and tachometer is also developed towards a farther detection distance and a higher speed measurement requirement, so that the laser ranging and tachometer has higher requirements. The sensitivity of coherent detection can approach the quantum noise limit of the detector under certain conditions, ultra-long distance detection can be realized, the laser detection distance of the laser distance and speed measuring machine is expected to be increased to hundreds of kilometers, and high-precision speed measurement is realized.
The single-frequency laser is a core device of a coherent detection system, the solid laser can obtain wavelength tunable single-frequency laser with narrow line width and large bandwidth, and the optical fiber amplifier has the advantage of maintaining the single-frequency performance of the seed source.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a seed optical space coupling wavelength tunable single-frequency optical fiber amplifier.
Technical scheme
A seed light space coupling wavelength tunable single-frequency optical fiber amplifier is characterized by comprising a seed source, an optical isolator 8, a seed light coupling injection system and an optical fiber amplification system which are arranged along an optical path in sequence; the seed source comprises a first semiconductor laser 1, a first convex lens 2, a second convex lens 3, a non-planar circulator 4, a permanent magnet 5 and a dichroic mirror 7; laser light of the first semiconductor laser 1 enters the non-planar circulator 4 at an angle of 45 degrees through the first convex lens 2 and the second convex lens 3, is reflected and then is injected into the light isolator 8 through the dichroic mirror 7, wherein the non-planar circulator 4 is provided with a permanent magnet 5; the laser light passing through the optical isolator 8 passes through a seed light coupling injection system consisting of a third convex lens 9 and an aspheric lens 10 and then is injected into the optical fiber amplification system; the optical fiber amplification system comprises two identical semiconductor lasers, a pumping beam combiner 11, a double-cladding ytterbium-doped optical fiber 14 and a dichroic mirror 15; the laser of the seed optical coupling injection system is injected into a signal input fiber of a pump beam combiner 11, two semiconductor lasers are respectively connected with the pump input fiber of the pump beam combiner 11, an output fiber of the pump beam combiner 11 is connected with a double-cladding ytterbium-doped fiber 14, output laser of the double-cladding ytterbium-doped fiber 14 is incident to a dichroic mirror 15 at an angle of 45 degrees, and single-frequency laser with amplified power is obtained after the transmission of the dichroic mirror 15.
And a temperature control device 6 is arranged on the non-planar circulator 4.
When the seed source and the optical isolator 8, the seed optical coupling injection system and the optical fiber amplification system which are arranged along the optical path in sequence output the 1031nm single-frequency laser with amplified power, the parameter composition of each component is as follows: 945nm semiconductor laser 1, convex lens 2 with focal length of 150mm, convex lens 3 with focal length of 100mm, yb YAG non-planar circulator 4, 945/1031nm dichroic mirror 7, 1031nm optical isolator 8, convex lens 9 with focal length of 50mm, aspheric lens 10 with focal length of 6mm, pump beam combiner 11, 976nm semiconductor laser 12, 976nm semiconductor laser 13, double-clad ytterbium-doped fiber 14 and 976/1031nm dichroic mirror 15.
The laser linewidth of the 1031nm single-frequency laser is less than or equal to 20kHz, and the wavelength tuning bandwidth is 0.4nm.
The optical coupling efficiency of the seeds is more than or equal to 60 percent.
The amplification gain of the optical fiber amplification system is 21dB.
Advantageous effects
The invention provides a seed optical space coupling wavelength tunable single-frequency optical fiber amplifier, which mainly solves the problem of narrow wavelength tuning bandwidth of a high-power single-frequency laser. In order to obtain tunable single-frequency seed light with narrow line width and large bandwidth, a seed source adopts a Yb-YAG non-planar circulator with tuned temperature; in order to prevent the seed source device from being damaged by the reverse spontaneous radiation of the gain fiber, an optical isolator is added between the seed source and the fiber amplification system; in order to improve the coupling efficiency of the seed light to the optical fiber amplifying system, the seed light coupling and injecting system adopts a combination of a convex lens and an aspheric lens, and the seed light is injected into a signal input fiber of the pumping beam combiner; in order to improve the pump coupling efficiency of the optical fiber amplification system and obtain high-power output, the gain optical fiber adopts a double-cladding ytterbium-doped optical fiber.
The invention provides a design method for carrying out optical fiber amplification by solid single-frequency laser. In order to obtain tunable single-frequency seed light with narrow line width and large bandwidth, a seed source adopts a semiconductor laser with 945nm central wavelength to pump Yb, namely a YAG non-planar circulator with tuned temperature; in order to prevent the reverse spontaneous radiation of the gain fiber from damaging seed source devices, an optical isolator is added between the seed source and the fiber amplification system; in order to improve the coupling efficiency of the seed light to the amplifying system, the seed light coupling and injecting system adopts a combination of a convex lens and an aspheric lens, wherein the aspheric lens has higher numerical aperture and stronger light gathering capability compared with a common lens and is the key for improving the coupling efficiency; in order to improve the pump coupling efficiency, the gain fiber adopts a double-cladding ytterbium-doped fiber, and the pump light can be coupled into an inner cladding with the mode field diameter being much larger than that of the fiber core, so that the pump coupling efficiency of the fiber is greatly improved.
The laser can stably output 1031nm continuous single-frequency laser with the line width of less than or equal to 20kHz and the wavelength tuning bandwidth of 0.4nm, wherein the output power of the laser is more than 10W; the optical coupling efficiency of the seed is more than or equal to 60 percent, and the amplification gain of the optical fiber amplification system is 21dB.
Drawings
FIG. 1 is a schematic diagram of an optical path of a seed optical space coupling wavelength tunable single-frequency fiber amplifier, in which 1,2,3,4,5,6,7 constitute a seed source; 9,10 constitute a seed optical coupling injection system; 11,12,13,14,15 constitute a fiber amplifier system.
In the figure: 1-945nm semiconductor laser; a convex lens with the focal length of 2-150 mm and a convex lens with the focal length of 3-100 mm; 4-Yb is YAG non-planar circulator; 5-permanent magnets; 6-temperature control device; 7-945/1031nm dichroscope; an 8-1031nm optical isolator; a 9-focal length 50mm convex lens; 10-focal length 6mm aspheric lens; 11-a pump combiner; 12. 13-976nm semiconductor laser; 14-double clad ytterbium doped fiber; 15-976/1031nm dichroic mirror.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the scheme of the seed light space coupling wavelength tunable single-frequency optical fiber amplifier is as follows:
the single-frequency optical fiber amplifier consists of a seed source, an optical isolator, a seed optical coupling injection system and an optical fiber amplification system.
The seed light is obtained by pumping Yb YAG non-planar circulator by a 945nm semiconductor laser, the pumping light is injected into an input and output coupling surface of the Yb YAG non-planar circulator by adopting a coupling lens group of 1.5. The Yb/YAG non-planar circulator is subjected to accurate temperature regulation and control by a temperature control device, and the output of the wavelength tunable 1031nm single-frequency laser is realized.
And an optical isolator is adopted to prevent the reverse spontaneous radiation of the gain fiber from damaging the seed source device.
The optical fiber amplification system consists of a pumping beam combiner, a 976nm semiconductor laser, a double-cladding ytterbium-doped optical fiber and a 976/1031nm dichroic mirror.
The seed light coupling and injecting system consists of a convex lens and an aspheric lens and injects seed light into a signal input fiber of the pumping beam combiner efficiently.
The output fiber of the 976nm semiconductor laser is coupled with the pump input fiber of the pump combiner in a fusion mode, and the output fiber of the pump combiner is coupled with the ytterbium-doped fiber in a fusion mode.
And filtering the 1031nm single-frequency amplified laser by using a 976/1031nm dichroic mirror.
The installation and implementation steps are as follows:
the seed source system comprises the following implementation steps:
(1) Installing Yb, namely a YAG non-planar circulator 4 and a temperature control device 6, supplying power to the temperature control device 6, and realizing temperature control and temperature adjustment of the non-planar circulator 4;
(2) Installing and adjusting the orientation of a 945nm semiconductor laser 1, installing a convex lens 2 with the focal length of 150mm and a convex lens 3 with the focal length of 100mm to collimate and focus 945nm pump light output by the 945nm semiconductor laser 1, so that the pump light is incident on an input and output coupling surface of a Yb/YAG non-planar circulator 4 at an incident angle of 45 degrees;
(3) A permanent magnet 5 is arranged at the Nd, namely YAG non-planar circulator to supply power to the 945nm semiconductor laser 1, and then 1031nm single-frequency laser can be output; the 945/1031nm dichroic mirror 7 is attached and its orientation is adjusted so that the output laser light is incident at 45 ° to the 945/1031nm dichroic mirror 7, obtaining 1031nm single-frequency laser light (i.e., seed light).
2, a 1031nm optical isolator 8 is installed and oriented so that seed light passes through the 1031nm optical isolator 8 perpendicularly.
3, mounting a convex lens 9 with a focal length of 50mm and an aspheric lens 10 with a focal length of 6mm, and collimating and focusing the seed light laser;
and 4, installing a pump beam combiner 11, adjusting the position and the orientation of a signal input fiber of the pump beam combiner 11, and injecting the seed light into the signal input fiber of the pump beam combiner 11.
And 5, welding the output fibers of the 976nm semiconductor lasers 12 and 13 with the pump input fiber of the pump combiner 11, welding the output fiber of the pump combiner 11 with the double-clad ytterbium-doped fiber 14, and combining the step 4 to realize that the signal light and the pump light are simultaneously coupled and enter the double-clad ytterbium-doped fiber 14.
And 6, installing a 976/1031nm dichroic mirror 15 and adjusting the orientation of the dichroic mirror, so that the laser output by the optical fiber amplification system enters the 976/1031nm dichroic mirror 15 at an angle of 45 degrees, and finally obtaining the 1031nm single-frequency laser with amplified power.
Claims (6)
1. A seed light space coupling wavelength tunable single-frequency optical fiber amplifier is characterized by comprising a seed source, an optical isolator (8), a seed light coupling injection system and an optical fiber amplification system which are arranged along an optical path in sequence; the seed source comprises a first semiconductor laser (1), a first convex lens (2), a second convex lens (3), a non-planar circulator (4), a permanent magnet (5) and a dichroic mirror (7); laser of the first semiconductor laser 1 passes through a first convex lens (2) and a second convex lens (3), enters a non-planar circulator (4) at an angle of 45 degrees, is reflected and then passes through a dichroic mirror (7) and then is injected into a light isolator (8), wherein a permanent magnet (5) is arranged on the non-planar circulator (4); the laser light passing through the optical isolator (8) passes through a seed light coupling injection system composed of a third convex lens (9) and an aspheric lens (10) and then is injected into the optical fiber amplification system; the optical fiber amplification system comprises two identical semiconductor lasers, a pumping beam combiner (11), a double-cladding ytterbium-doped optical fiber (14) and a dichroic mirror (15); the laser of the seed optical coupling injection system is injected into a signal input fiber of a pump beam combiner (11), two semiconductor lasers are respectively connected with the pump input fiber of the pump beam combiner (11), an output fiber of the pump beam combiner (11) is connected with a double-cladding ytterbium-doped fiber (14), output laser of the double-cladding ytterbium-doped fiber (14) enters a dichroic mirror (15) at an angle of 45 degrees, and the dichroic mirror (15) transmits the output laser to obtain single-frequency laser with amplified power.
2. The seed optical spatial-coupled wavelength tunable single-frequency fiber amplifier of claim 1, wherein: and a temperature control device 6 is arranged on the non-planar circulator (4).
3. The seed optical spatial coupling wavelength tunable single-frequency fiber amplifier according to claim 1, wherein: when the seed source and the optical isolator (8), the seed optical coupling injection system and the optical fiber amplification system which are arranged along the optical path in sequence output the amplified 1031nm single-frequency laser, the parameter combination of each device is as follows: 945nm semiconductor laser (1), a convex lens (2) with the focal length of 150mm, a convex lens (3) with the focal length of 100mm, a Yb YAG non-planar circulator (4), a 945/1031nm dichroic mirror (7), an 1031nm optical isolator 8, a convex lens (9) with the focal length of 50mm, an aspheric lens (10) with the focal length of 6mm, a pumping beam combiner (11), a 976nm semiconductor laser (12), a 976nm semiconductor laser (13), a double-cladding ytterbium-doped optical fiber (14) and a 976/1031nm dichroic mirror (15).
4. The seed optical spatial-coupled wavelength tunable single-frequency fiber amplifier of claim 1, wherein: the laser linewidth of the 1031nm single-frequency laser is less than or equal to 20kHz, and the wavelength tuning bandwidth is 0.4nm.
5. The seed optical spatial coupling wavelength tunable single-frequency fiber amplifier according to claim 1, wherein: the light coupling efficiency of the seeds is more than or equal to 60 percent.
6. The seed optical spatial coupling wavelength tunable single-frequency fiber amplifier according to claim 1, wherein: the amplification gain of the optical fiber amplification system is 21dB.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117117612A (en) * | 2023-08-23 | 2023-11-24 | 华中科技大学 | Non-planar annular cavity laser for improving optical isolation and optical isolation improving method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117117612A (en) * | 2023-08-23 | 2023-11-24 | 华中科技大学 | Non-planar annular cavity laser for improving optical isolation and optical isolation improving method |
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