CN113314932A - 760nm high-stability all-fiber frequency-doubled laser - Google Patents
760nm high-stability all-fiber frequency-doubled laser Download PDFInfo
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Abstract
The invention relates to a 760nm high-stability all-fiber frequency-doubled laser, which comprises a seed light part, an amplification stage part, an output light part and a detection part. The seed light is 1520nm low-noise narrow linewidth laser, the linewidth is less than 1MHz, the side mode suppression ratio is better than 40dB, and the polarization extinction ratio is more than 20 dB. The amplification stage section includes a first stage pre-amplification section, a second stage main amplification section, and a third stage main amplification section. The seed light part is amplified by the amplification part, so that the optical power can be greatly improved to watt level on the basis of keeping the excellent characteristics of the seed light, the frequency multiplication is carried out on the output light part through the PPLN crystal, high-power laser with the power of more than 1W can be output after the 1520nm wavelength is converted, and the optical-optical conversion efficiency can be effectively improved. The all-fiber structure has stable output and low requirement on environment, the amplifying part greatly improves the output light power, and the all-fiber structure has the excellent characteristics of high power, narrow line width, low noise and the like.
Description
Technical Field
The invention belongs to the technical field of nonlinear optical fiber amplification, and particularly relates to a 760nm high-stability all-optical fiber frequency-doubled laser.
Background
The fiber laser plays more and more important roles in the field of lasers at present, and the 760nm all-fiber laser can be used for atmospheric laser radar detection, space cold atomic clock, oxygen concentration detection, scientific experiment and the like, and plays a vital role in the fields of national defense, space, medical treatment, scientific research and the like.
The Main Oscillation Power Amplification (MOPA) technology is to couple pump light and seed light and amplify the coupled pump light in a gain fiber, thereby achieving the purpose of outputting high power. The MOPA amplification technology is based on, high-quality laser with adjustable power can be realized, and output light of the laser has good light beam quality and good characteristics of time domain, frequency domain and the like. After seed light is amplified through MOPA technology, high-power and high-energy output can be realized, and high-power frequency doubling light output with good characteristics can be obtained after frequency doubling is carried out on the seed light through PPLN crystal.
Laser frequency doubling is a way to obtain other wavelengths by changing the laser frequency. There are many factors that affect the frequency doubling conversion efficiency, such as the fundamental frequency optical characteristics, the physical characteristics of the frequency doubling crystal material, the temperature, the angle, etc. In order to reduce laser loss and improve frequency doubling conversion efficiency, PPLN (periodically poled lithium niobate) is selected as a frequency doubling crystal, and higher optical-to-optical conversion efficiency can be realized by controlling the temperature of the PPLN, so that the purpose of high-efficiency output is achieved.
Most of the existing 760nm lasers are solid lasers, 760nm all-fiber lasers are only reported, 760nm fiber lasers capable of outputting optical power above watt level are not reported, and the solid lasers are far inferior to the fiber lasers in the aspects of conversion efficiency, vibration resistance, portability and the like. The technical difficulty of directly generating 760nm high-power output is extremely high, high-power 760nm laser output can be obtained through PPLN crystal frequency multiplication after the MOPA technology is used for amplification, and meanwhile, the excellent characteristics of low noise, narrow line width and the like of seed light are kept. Compared with solid laser output, the laser output obtained by the method has the advantages of light volume, light weight, good heat dissipation effect, higher stability, more compact space structure and longer service life, thereby being more beneficial to the fields of aerospace, military, radar detection and the like.
Disclosure of Invention
Based on the current 760nm laser acquisition mode, the solid laser has high requirements on stability, the light-light conversion efficiency is low, the output light power is unstable, the portability and the stability are not easy to realize, the output light power adjustability is poor, the output light power with the obtained 760nm wavelength is not ideal, and the like. The invention provides a 760nm high-stability all-fiber frequency-doubled laser.
In order to achieve the above object, the present invention provides a 760nm high-stability all-fiber frequency-doubled laser, which includes a seed light portion for outputting low-noise narrow-linewidth 1520nm seed light, an amplification stage portion for amplifying the seed light to watt level, and a light output and detection portion for converting 1520nm wavelength;
the seed light part comprises a 1520nm low-noise narrow-linewidth laser, the linewidth of the output seed light is less than 1MHz, the side mode suppression ratio is better than 40dB, the polarization extinction ratio is greater than 20dB, and the power is not lower than 10mW after being output by the polarization maintaining optical fiber;
the amplification stage part is arranged behind the seed light part and comprises a first-stage pre-amplification part, a second-stage main amplification part and a third-stage main amplification part;
the first-stage pre-amplification part comprises a polarization-maintaining isolator, a single-mode 976nm pump laser, a single-mode pump protector, a polarization-maintaining wavelength division multiplexer, an erbium-doped gain fiber and a first polarization-maintaining isolation filter which are sequentially arranged;
the second-stage main amplification part is arranged behind the first-stage pre-amplification part polarization-maintaining isolation filter, and comprises a first multimode 976nm pump laser, a first multimode pump protector, a second multimode 976nm pump laser, a second multimode pump protector, a first polarization-maintaining combiner, a first erbium and ytterbium co-doped gain fiber, a first pump filter and a second polarization-maintaining isolation filter which are sequentially arranged;
the third-stage main amplification part is arranged behind the second-stage main amplification part polarization-maintaining isolation filter, and comprises a third multimode 976nm pump laser, a third multimode pump protector, a fourth multimode 976nm pump laser, a fourth multimode pump protector, a second polarization-maintaining combiner, a second erbium and ytterbium co-doped gain fiber, a second pump filter and a third polarization-maintaining isolation filter which are sequentially arranged;
the light output part is arranged behind the amplification stage part and comprises a PPLN frequency doubling crystal and a light output detection device.
The all-fiber frequency-doubled laser consists of seed light, a rare earth ion-doped fiber serving as a gain medium and pump light injected to the end face of the gain fiber, and the pump light is coupled by a fiber beam combining device to replace an end face pump light mode.
The gain medium is composed of erbium-doped optical fibers and erbium-ytterbium co-doped optical fibers. The wavelength range of the absorbable pump source of the gain optical fiber doped with rare earth ions is 940-980 nm;
the wavelength division multiplexer and the optical fiber combiner are both optical fiber pumping/signal combiner, wherein the wavelength division multiplexer is a single-mode polarization-maintaining optical fiber, and the optical fiber combiner is a double-cladding polarization-maintaining optical fiber with the fiber core diameter not less than 10 mu m.
Optionally, the seed light part and the amplification stage part can be arranged in an optical fiber welding or flange butt joint mode, and the amplification stage part and the light output part can be arranged in an optical fiber welding or flange butt joint mode;
optionally, the light output section further comprises a beam detection device disposed behind the light output section.
Compared with the prior art for obtaining the 760nm laser, the invention has the beneficial effects that:
by combining the MOPA amplification technology and the frequency doubling technology, the low-noise narrow linewidth 760nm laser source with adjustable power range can be realized.
The high-power laser output of all-fiber 760nm watt level can be realized, and the linewidth is ensured to be less than 1MHz, the side mode suppression ratio is better than 40dB, and the polarization extinction ratio is more than 20 dB.
The MOPA amplifying and frequency doubling device has the advantages of simple structure, lower cost, high conversion efficiency and reliability, easy carrying of an all-fiber laser and high stability, and is the first choice of 760nm high-power lasers used in various fields.
Drawings
FIG. 1 is a schematic plan view of the apparatus of the present invention;
in the figure: 1-1520nm seed laser part, 2-amplification stage part, and 3-light output and detection part.
FIG. 2 is a schematic diagram of a portion of an amplification stage of the present invention;
in the figure: 4-polarization maintaining isolator, 5-single mode 976nm pump laser, 6-single mode pump protector, 7-polarization wavelength division multiplexer, 8-gain fiber, 9-polarization maintaining isolation filter, 10-first multimode 976nm pump laser, 11-first multimode pump protector, 12-second multimode 976nm pump laser, 13-second multimode pump protector, 14-first polarization maintaining combiner, 15-first erbium ytterbium co-doped gain fiber, 16-first pump filtering, 17-second polarization maintaining isolation filter, 18-third multimode 976nm pump laser, 19-third multimode pump protector, 20-fourth multimode 976nm pump laser, 21-fourth multimode pump protector, 22-second polarization maintaining combiner, 23-second erbium co-doped gain fiber, 24-second pump rejection, 25-third polarization maintaining isolation filter.
FIG. 3 is a schematic view of the light output and detection portion of the present invention;
in the figure: 26-wavelength conversion means, 27-detection means.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present invention can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present invention.
With the continuous development of laser technology, high-power fiber lasers continuously play a vital role in various fields such as aerospace, laser radar detection, medical treatment, military and the like. The requirements for lasers with wavelengths of 760nm in the fields of space cold atomic clocks, laser radar detection, biological medicine and the like are urgent, and solid lasers are not as good as fiber lasers in the fields of stability and aerospace. Therefore, the 760nm high-stability all-fiber frequency-doubled laser provided by the invention has the advantages of high stability, small occupied space, easiness in carrying, high light-light conversion efficiency, low cost and the like, and fully meets the use requirements in the aerospace field.
The all-fiber Main Oscillation Power (MOPA) amplification technology generally adopts a semiconductor laser to realize high-gain and high-power output through gain fiber amplification. The MOPA amplification technology can keep the seed characteristics unchanged, and the output laser has excellent polarization state, narrow line width and stable working wavelength.
The optical frequency doubling technology is also called as a second harmonic technology, the wave band of laser is expanded by the frequency doubling technology, and laser with shorter wavelength can be obtained, wherein the frequency doubling technology is a phenomenon that light wave with the frequency of 2 omega is generated after light wave with the frequency of omega is incident into a nonlinear crystal medium at a certain angle.
Referring to fig. 1, a 760nm high-stability all-fiber frequency-doubled laser includes a seed light portion 1, an amplifier portion 2, and a light output detection portion 3; the seed light part comprises a 1520nm low-noise narrow-linewidth laser, the linewidth is less than 1MHz, the side mode suppression ratio is better than 40dB, the polarization extinction ratio is greater than 20dB, and the power is not lower than 10mW after being output by a polarization maintaining optical fiber;
fig. 2 is a diagram of the amplification stage portion, which is disposed behind the seed light portion 1 and includes a first stage pre-amplification portion, a second stage main amplification portion, and a third stage main amplification portion;
the first-stage pre-amplification part comprises a polarization-maintaining isolator 4, a single-mode 976nm pump laser 5, a single-mode pump protector 6, a polarization-maintaining wavelength division multiplexer 7, an erbium-doped gain fiber 8 and a first polarization-maintaining isolation filter 9 which are sequentially arranged;
the second-stage main amplification part is arranged behind the first-stage pre-amplification part polarization-maintaining isolation filter 9 and comprises a first multi-mode 976nm pump laser 10, a first multi-mode pump protector 11, a second multi-mode 976nm pump laser 12, a second multi-mode pump protector 13, a first polarization-maintaining combiner 14, a first erbium and ytterbium co-doped gain fiber 15, a first pump filter 16 and a second polarization-maintaining isolation filter 17 which are sequentially arranged;
the third-stage main amplification part is arranged behind a second-stage main amplification part polarization-maintaining isolation filter 17 and comprises a third multi-mode 976nm pump laser 18, a third multi-mode pump protector 19, a fourth multi-mode 976nm pump laser 20, a fourth multi-mode pump protector 21, a second polarization-maintaining combiner 22, a second erbium and ytterbium co-doped gain fiber 23, a second pump filter 24 and a third polarization-maintaining isolation filter 25 which are sequentially arranged;
after the seed light part 1 is amplified by the amplification stage part 2, the output light characteristic is consistent with that of the seed light, and the output light power is not lower than watt level.
Fig. 3 shows the light output section 3, which is arranged behind the amplifier stage section 2. The light output part comprises a PPLN frequency doubling crystal 26 and a light output detection system 27, and after the wavelength is converted by the frequency doubling crystal, the line width is kept to be smaller than 1MHz, the side mode suppression ratio is better than 40dB, and the polarization extinction ratio is larger than 20dB, and the 760nm light output power is not lower than 1W.
The seed light is combined by the polarization-maintaining isolator 4 and the single-mode 976nm pump laser 5 passing through the single-mode pump protector 6 through the polarization-maintaining wavelength division multiplexer 7, is pre-amplified by the erbium-doped gain fiber 8, and enters the second-stage main amplifying part after being filtered by the first polarization-maintaining isolation filter 9;
after the seed light after the first-stage pre-amplification is combined with the first multimode 976nm pump laser passing through the first multimode pump protector 11 and the second multimode 976nm pump light 12 passing through the second multimode pump protector 13 by the first polarization maintaining beam combiner 14, the seed light is amplified in the first erbium and ytterbium co-doped gain fiber 15, and then the second-stage main amplification unabsorbed pump light is filtered by the first pump filtering 16 and the second polarization maintaining isolation filter 17 in sequence and enters the third-stage main amplification part;
after the seed light after the second-stage main amplification is combined with the third multimode 976nm pump laser 18 passing through the third multimode pump protector 19 and the fourth multimode 976nm pump laser 20 passing through the fourth multimode pump protector 21 by the second polarization maintaining beam combiner 22, the second-stage main amplification is performed in the second erbium and ytterbium co-doped gain fiber 23, and then the second-stage main amplified unabsorbed pump light is filtered by the second pump filtering 24 and the third polarization maintaining isolation filter 25 in sequence and enters the light output part 3.
This arrangement is one of all devices, but the arrangement is not limited to this.
Example (b):
referring to fig. 1, a diode laser with 1520nm and output optical power of 10mW is used as seed light, the line width is less than 1MHz, the side mode suppression ratio is better than 40dB, and the polarization extinction ratio is greater than 20 dB. The seed light is amplified by the amplification stage part, the power of the seed light can be amplified to more than 2W on the basis of ensuring the characteristics of the seed light, and the pumping protection device protects the pumping light from being damaged by the nonlinear effect and the self-excitation radiation effect.
The watt-level seed light amplified by the amplification stage part is subjected to frequency multiplication through the PPLN frequency multiplication crystal. After passing through PPLN frequency doubling crystal, 760nm high power light output above 1W can be generated.
The invention relates to a method for obtaining low-noise narrow linewidth 760nm high-power laser by amplifying and frequency doubling low-power seed light, which reduces the requirement on the power of the seed light under the conditions of reducing the cost and simplifying the structure as much as possible compared with the existing 760nm laser, and enables the seed light to be amplified at least more than once by means of MOPA (metal oxide arrester) amplification pumping, so that the light output power is greatly improved on the premise of keeping the low-noise narrow linewidth of the seed light, the 760nm wavelength high-power laser is output after passing through a frequency doubling crystal, and the high-power laser has extremely high light-light conversion efficiency. The seed light part is amplified by the amplification part, the optical power can be greatly improved to watt level on the basis of keeping the excellent characteristics of the seed light, the line width is less than 1MHz, the side mode suppression ratio is better than 40dB, the polarization extinction ratio is greater than 20dB, the frequency multiplication is carried out on the output light part through a PPLN crystal, the 1520nm wavelength is converted, the high-power laser with the power of more than 1W can be output, and the optical-optical conversion efficiency can be effectively improved. The all-fiber structure has stable output, simple structure, small space occupancy rate and low requirement on environment, the amplifying part greatly improves the output light power, has the excellent characteristics of high power, narrow line width, low noise and the like, and has the excellent characteristics of high adjustability, high reliability and the like, and can be applied to the fields of aerospace, military, medical treatment and the like with extremely high requirement on environment.
Although the present invention has been described above with reference to specific embodiments, it will be appreciated by those skilled in the art that many modifications are possible in the arrangement and details of the invention disclosed within the principle and scope of the invention. The scope of the invention is to be determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (6)
1. A760 nm high-stability all-fiber frequency-doubled laser is characterized in that: comprises a seed light part (1) for outputting seed light with low noise and narrow line width of 1520nm, an amplification stage part (2) for amplifying the seed light to watt level, and a light output and detection part (3) for converting the wavelength of 1520 nm;
the amplification stage part (2) is arranged behind the seed light part (1) and comprises a first-stage pre-amplification part, a second-stage main amplification part and a third-stage main amplification part;
the first-stage pre-amplification part comprises a polarization-maintaining isolator (4), a single-mode 976nm pump laser (5), a single-mode pump protector (6), a polarization-maintaining wavelength division multiplexer (7), an erbium-doped gain fiber (8) and a first polarization-maintaining isolation filter (9);
the second-stage main amplification part is arranged behind the first-stage pre-amplification part polarization-maintaining isolation filter (9), and comprises a first multi-mode 976nm pump laser (10), a first multi-mode pump protector (11), a second multi-mode 976nm pump laser (12), a second multi-mode pump protector (13), a first polarization-maintaining combiner (14), a first erbium and ytterbium co-doped gain fiber (15), a first pump filter (16) and a second polarization-maintaining isolation filter (17);
the third-stage main amplification part is arranged behind a second-stage main amplification part polarization-maintaining isolation filter (17), and comprises a third multi-mode 976nm pump laser (18), a third multi-mode pump protector (19), a fourth multi-mode 976nm pump laser (20), a fourth multi-mode pump protector (21), a second polarization-maintaining combiner (22), a second erbium and ytterbium co-doped gain fiber (23), a second pump filter (24) and a third polarization-maintaining isolation filter (25);
the seed light is combined with a single-mode 976nm pump laser (5) passing through a single-mode pump protector (6) through a polarization-preserving isolator (4) through a polarization-preserving wavelength division multiplexer (7), is pre-amplified through an erbium-doped gain fiber (8), and enters a second-stage main amplifying part after being filtered by a first polarization-preserving isolation filter (9);
after being amplified in a first erbium ytterbium co-doped gain fiber (15), the seed light which is pre-amplified by the first stage, a first multimode 976nm pump laser (10) which is pumped by a first multimode pump protector (11) and a second multimode 976nm pump laser (12) which is pumped by a second multimode pump protector (13) are combined through a first polarization maintaining beam combiner (14), and then, a second-stage main amplification unabsorbed pump light is filtered through a first pump filtering (16) and a second polarization maintaining isolation filter (17) in sequence and enters a third-stage main amplification part;
after the seed light subjected to the second-stage main amplification is combined with third multimode 976nm pump laser (18) passing through a third multimode pump protector (19) and fourth multimode 976nm pump laser (20) passing through a fourth multimode pump protector (21) through a second polarization-maintaining combiner (22), second-stage main amplification is performed in a second erbium ytterbium co-doped gain fiber (23), and then second-stage main amplification unabsorbed pump light is filtered by a second pump filtering (24) and a third polarization-maintaining isolation filter (25) in sequence and enters an optical output part (3);
the optical output part (3) is arranged behind the amplification stage part (2) and comprises a PPLN frequency doubling crystal (26) and an optical output detection device (27) which are sequentially connected.
2. The 760nm high-stability all-fiber frequency-doubled laser as claimed in claim 1, wherein the seed light portion (1) is 1520nm low-noise narrow linewidth laser, linewidth is less than 1MHz, side-mode suppression ratio is better than 40dB, polarization extinction ratio is greater than 20dB, and power is not less than 10mW after being output by the polarization maintaining fiber.
3. The low-noise narrow-linewidth all-fiber 760nm high-power laser device as claimed in claim 1, wherein the polarization-maintaining wavelength division multiplexer (7), the first polarization-maintaining beam combiner (14) and the second polarization-maintaining beam combiner (22) are all fiber pump/signal beam combiners, the transmission fiber of the polarization-maintaining wavelength division multiplexer (7) is a single-mode polarization-maintaining fiber, and the transmission fiber of the first polarization-maintaining beam combiner (14) and the second polarization-maintaining beam combiner (22) is a double-clad polarization-maintaining fiber with a fiber core diameter not less than 10 μm.
4. The low-noise narrow-linewidth all-fiber 760nm high power laser of claim 1 wherein the erbium-doped gain fibers (8), the first (15) and second (23) ytterbium-co-doped gain fibers all can absorb pump sources in the 940-980nm wavelength range.
5. The low-noise narrow-linewidth all-fiber 760nm high-power laser as claimed in claim 1, wherein said PPLN (periodically poled lithium niobate) frequency doubling crystal (26) is used for wavelength conversion.
6. The low-noise narrow-linewidth all-fiber 760nm high-power laser as claimed in any one of claims 1-5, wherein said seed light portion, said amplifier stage portion and said light output portion are fused together by polarization maintaining fibers.
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