CN114336249A - Raman laser for realizing wavelength precise tuning through temperature control - Google Patents
Raman laser for realizing wavelength precise tuning through temperature control Download PDFInfo
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- CN114336249A CN114336249A CN202011080539.4A CN202011080539A CN114336249A CN 114336249 A CN114336249 A CN 114336249A CN 202011080539 A CN202011080539 A CN 202011080539A CN 114336249 A CN114336249 A CN 114336249A
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Abstract
The invention provides a Raman laser for realizing fine tuning of output wavelength by adjusting gas temperature, which comprises: the pump laser is used for outputting pump laser with parallel light beams; the wavelength converter is used for converting the pump laser into Raman laser to be output, and Raman active gas is filled in the wavelength converter; a focusing lens for focusing the pump laser light into a wavelength converter; the temperature control module is used for controlling the temperature of the wavelength converter; and the gas pressure regulating device is used for controlling the density of the Raman active gas in the wavelength converter. The Raman laser provided by the invention can realize precise tuning on the output wavelength of the Raman laser through temperature.
Description
Technical Field
The invention belongs to the field of lasers, and particularly relates to a Raman laser for realizing wavelength precise tuning through temperature control.
Technical Field
Laser is a special light source, which has monochromaticity (single output wavelength), but at present, a single type of laser cannot generate all wavelengths, and in order to enrich the wavelength types and meet different wavelength requirements, the laser needs to convert the existing laser wavelength and generate the required wavelength through the wavelength conversion.
Stimulated Raman is an important laser frequency conversion method, and a great deal of research and application are made on the stimulated Raman laser frequency conversion technology at home and abroad. The wide range of adjustment of the raman conversion achieved is usually over several hundreds of wavenumbers, for example, the vibrational raman shift of a gas can reach thousands of wavenumbers, the rotational raman shift has at least several hundreds of wavenumbers, and the crystal raman shift also has several hundreds of wavenumbers. Current research is mainly focused on large span tuning of the wavelength, while in some applications a small and fine tuning of the wavelength of the output laser is required.
Disclosure of Invention
The invention relates to a laser frequency conversion device, which can realize fine adjustment of Raman laser wavelength through temperature change of a gas medium.
The technical scheme of the invention is as follows:
a Raman laser for realizing fine tuning of output wavelength through gas temperature regulation mainly comprises two parts: a pump laser source and a wavelength converter.
Specifically, the raman laser includes:
the pump laser is used for outputting pump laser with parallel light beams;
the wavelength converter is used for converting the pump laser into Raman laser to be output, and Raman active gas is filled in the wavelength converter;
a focusing lens for focusing the pump laser light into a wavelength converter;
the temperature control module is used for controlling the temperature of the wavelength converter;
and the gas pressure regulating device is used for controlling the density of the Raman active gas in the wavelength converter.
The focal length of the focusing lens is matched with the length of the Raman cell, for example, a one-meter Raman cell adopts a half-meter focusing lens;
based on the above scheme, preferably, the temperature control module comprises a temperature controller and a temperature controller power supply; the temperature controller is in large-area contact with the pipe wall of the wavelength converter in a winding, sleeving or bolt fixing mode; the temperature controller power supply supplies power to the temperature controller;
the air pressure adjusting device comprises an air pressure gauge and an air pressure charging and discharging valve; the gas pressure gauge is used for reading the gas pressure in the wavelength converter; the air pressure charging and discharging valve is used for controlling charging and discharging of air in the wavelength converter.
Based on the above scheme, preferably, the temperature control mode of the temperature control module is electric temperature control or flowing liquid temperature control.
Based on the above scheme, preferably, the electric temperature control mode is electric heating or semiconductor refrigeration; the temperature of the flowing liquid is controlled by heating or cooling through a liquid flowing medium.
The temperature controller and the temperature controller power supply can realize the control of the temperature rise of the wavelength converter and the cooling of the wavelength converter, and the temperature control is a device with adjustable temperature.
Based on the above solution, preferably, as shown in fig. 1 of the accompanying drawings: the wavelength converter comprises a Raman pool, and the central axis of the Raman pool along the length direction is coincident with the central axis of the pump laser beam; and a first Raman pool window and a second Raman pool window are respectively arranged at two ends of the Raman pool along the transmission direction of the light beam. The central axis of the first Raman pool window and the central axis of the second Raman pool window are ensured to be coincident with the central axis of the pump laser beam; two connecting pipelines are welded at two sides of the Raman pool and are respectively connected with a barometer and a gas charging and discharging valve.
Based on the scheme, preferably, the Raman cell is a hollow tubular container; the Raman cell can bear high pressure, and the pressure range is 0.01-5.00 MPa.
A pumping laser antireflection film is plated on the surface of the first Raman cell window; and the surface of the Raman cell window II is plated with pump laser and a Raman laser antireflection film.
Based on the above solution, preferably, as shown in fig. 2 of the accompanying drawings: the Raman pool is divided into two parts, namely a Raman pool input end and a Raman pool output end; a photonic crystal fiber is arranged between the input end of the Raman cell and the output end of the Raman cell; two ends of the photonic crystal fiber are respectively connected with a fixed tube; the two fixing pipes are respectively communicated and fixed with the input end of the Raman pool and the output end of the Raman pool; the central axes of the two fixed pipes along the length direction are coincident with the central axis of the pump laser beam;
the focusing lens collects the pump laser into the photonic crystal fiber, and Raman laser output is generated after the pump laser passes through the photonic crystal fiber;
the air pressure adjusting device controls the density of Raman active gas in the photonic crystal fiber through the input end of the Raman cell and the output end of the Raman cell; the temperature control module is used for controlling the temperature of the photonic crystal fiber.
The photonic crystal fiber is designed to meet the requirements of low-loss transmission of pump laser wavelength and Raman laser wavelength through a band gap.
Based on the above scheme, preferably, the raman active gas comprises any one of nitrogen, oxygen and methane; the output wavelength range of the pump laser is wide and covers any one of ultraviolet light, visible light and infrared light.
Based on the above scheme, preferably, the air pressure adjusting device comprises an air bottle; the gas cylinder is used for supplying Raman active gas into the wavelength converter.
The process of realizing the Raman laser is as follows: as shown in fig. 1, after being output from one end, the pump laser is focused into a raman pool through a focusing lens, and raman laser output is directly generated; or as shown in fig. 2, the pump laser passes through the focusing lens and is collected in the hollow-core photonic crystal fiber at one end of the raman pool, and passes through the hollow-core photonic crystal fiber and is output out of the raman pool from the other end of the raman pool.
The gas temperature of the invention is changed through the temperature control module, and the specific realization process is as follows: the gas temperature is controlled by a temperature controller and a temperature controller power supply; the apparatus of fig. 1 and 2 is adapted to the above-mentioned method of adjusting the gas temperature.
The invention relates to a laser wavelength conversion method through a stimulated Raman scattering effect, which is characterized in that the laser wavelength conversion method is characterized in that the laser source which is different from pump laser is generated through a Raman medium by taking the existing finished laser (for example, solid Nd: YAG and laser with various wavelengths generated by methods of frequency doubling, frequency combining, parametric oscillation and the like) as a pump light source. The key technology is to realize the accurate tuning of the Raman conversion wavelength by changing the temperature of the Raman medium, wherein the physical principle is that the energy level population of molecules can change along with the change of the temperature, such as the density of methane gas and the same gas of 0.15001g/cm3The corresponding Raman shift from 150 deg.C to 250 deg.C under the condition can be from 2914.88cm-1To 2915.23cm-1Therefore, the output wavelength of the raman laser can be precisely tuned by temperature.
Advantageous effects
1. The invention has the advantages that (1) the wavelength conversion of the laser can be realized; (2) the wavelength of the Raman laser can be finely adjusted on the basis of great change of the laser wavelength; (3) the light conversion efficiency of the variable frequency laser can be improved by using methods such as photonic crystal fiber and the like in the design; (4) low cost and simple structure.
2. The invention firstly provides a method for micro-adjustment of frequency conversion and intermediate frequency shift of Raman laser, and the method realizes the fineness of Raman laser wavelength by changing the temperature of a Raman mediumAdjustment, typically with an accuracy of up to 10-2cm-1. The invention can realize the great adjustment of the laser wavelength, and simultaneously realize the micro-adjustment of the Raman frequency shift through the temperature control of the medium, and finally realize the accurate adjustment of the Raman laser wavelength.
3. The Raman frequency conversion laser can be applied to the field of laser frequency conversion and laser wavelength precise tuning, the design is to realize the large-range movement of wavelength of thousands of wave numbers after the output wavelength of the existing finished laser passes through a Raman cell, and meanwhile, the laser wavelength can be finely tuned in a tiny range within a plurality of wave numbers by controlling the temperature. The technology can be applied to the field of laser frequency conversion, and can be applied to some applications which are sensitive to small wavelength shifts, such as the spectral detection of some substances, for example, the fine tuning of the wavelength during the transmission of laser in the atmosphere can effectively avoid the absorption peak of water in the atmosphere, and the like.
Drawings
FIG. 1 is a schematic structural diagram of a Raman laser for realizing fine tuning of output wavelength through gas temperature regulation (scheme one);
fig. 2 is a schematic structural diagram of a hollow-core photonic crystal fiber additionally installed inside a raman pool 5 (scheme two);
the device names in the figure are as follows:
1. a pump laser; 2. a focusing lens; 3. a first Raman pool window; 4. a second Raman pool window; 5. a Raman pool; 6. a gas pressure gauge; 7. a pneumatic charging and discharging valve; 8. a temperature controller; 9. a temperature controller power supply; 10. a hollow core photonic crystal fiber; 11. fixing a first pipe; 12. a second fixing pipe; 13. air pressure charging and discharging valve.
Detailed Description
In order to describe the specific working process and the using method of the invention in detail, the specific embodiment of the invention is illustrated by combining the practical application situation.
Example 1
As shown in fig. 1, a raman laser that achieves fine tuning of the output wavelength by gas temperature adjustment generates a first-order stokes laser. YAG laser is used to pump methane to generate Raman laser with wavelength of 1543 nm.
According to fig. 1 of the drawings, the raman laser operates as follows:
the first step is as follows: focusing and inputting the pump laser into the Raman pool;
the second step is that: the temperature of methane gas in the Raman pool can be adjusted through the temperature control module;
the third step: and detecting the output Raman laser by adopting a wavelength meter, and setting a reasonable methane gas temperature according to the wavelength requirement.
For example: the density of methane is 0.15g/cm3The corresponding relationship between time temperature and Raman frequency shift is shown in the following table
Example 2
The fiber laser of IPG commercialization is adopted as a pump laser source, the wavelength of the fiber laser is 1070nm, the design scheme of FIG. 2 can focus and collect the IPG fiber laser into the hollow-core photonic crystal fiber, high-purity methane is filled in a Raman pool, the 1070nm wavelength laser can be converted into 2840nm, and the Raman wavelength can be finely tuned near 2840nm by adjusting the temperature of methane gas. For example, when the temperature range is-100 to 300 ℃, the tuning of the Raman laser wavelength at about 2831 to 2849nm can be realized.
Example 3
According to the design scheme of fig. 2, the hollow-core photonic crystal fiber is added into the raman pool to reduce the threshold of stimulated raman, and realize high-efficiency conversion of pump laser.
The implementation process of the scheme can be that 532nm laser is used as pump laser, high-purity nitrogen is filled in a Raman pool, the 532nm pump laser is collected into the hollow photonic crystal fiber through a focusing lens, the Raman laser wavelength can be finely tuned around 607nm through controlling the gas temperature, and the Raman laser wavelength can be tuned around 602-610 nm if the temperature range is-100 ℃.
Claims (9)
1. A raman laser, characterized in that the raman laser comprises:
the pump laser is used for outputting pump laser with parallel light beams;
the wavelength converter is used for converting the pump laser into Raman laser to be output, and Raman active gas is filled in the wavelength converter;
a focusing lens for focusing the pump laser light into a wavelength converter;
the temperature control module is used for controlling the temperature of the wavelength converter;
and the gas pressure regulating device is used for controlling the density of the Raman active gas in the wavelength converter.
2. Raman laser according to claim 1,
the temperature control module comprises a temperature controller and a temperature controller power supply; the temperature controller is in contact with the pipe wall of the wavelength converter in a winding, sleeving or bolt fixing mode; the temperature controller power supply supplies power to the temperature controller;
the air pressure adjusting device comprises an air pressure gauge and an air pressure charging and discharging valve; the gas pressure gauge is used for reading the gas pressure in the wavelength converter; the air pressure charging and discharging valve is used for controlling charging and discharging of air in the wavelength converter.
3. The raman laser according to claim 2, wherein the temperature control means of the temperature control module is an electrically controlled temperature or a temperature controlled by a flowing liquid.
4. A raman laser according to claim 3, wherein said electrical temperature control means is electrical heating or semiconductor cooling; the temperature of the flowing liquid is controlled by heating or cooling through a liquid flowing medium.
5. A raman laser according to claim 1, wherein said wavelength converter comprises a raman cell having a central axis along a length direction coincident with a central axis of said pump laser beam; and a first Raman pool window and a second Raman pool window are respectively arranged at two ends of the Raman pool along the transmission direction of the light beam.
6. A Raman laser according to claim 5, wherein: the Raman pool is a hollow tubular container; the Raman cell can bear high pressure, and the pressure range is 0.01-5 MPa;
a pumping laser antireflection film is plated on the surface of the first Raman cell window; and the surface of the Raman cell window II is plated with a pumping laser and a Raman laser antireflection film.
7. A Raman laser according to claim 5, wherein: the Raman pool is divided into two parts, namely a Raman pool input end and a Raman pool output end; a photonic crystal fiber is arranged between the input end of the Raman cell and the output end of the Raman cell; two ends of the photonic crystal fiber are respectively connected with a fixed tube; the two fixing pipes are respectively communicated and fixed with the input end of the Raman pool and the output end of the Raman pool; the central axes of the two fixed pipes along the length direction are coincident with the central axis of the pump laser beam;
the focusing lens collects the pump laser into the photonic crystal fiber, and Raman laser output is generated after the pump laser passes through the photonic crystal fiber;
the air pressure adjusting device controls the density of Raman active gas in the photonic crystal fiber through the input end of the Raman cell and the output end of the Raman cell; the temperature control module is used for controlling the temperature of the photonic crystal fiber.
8. A raman laser according to claim 1, wherein said raman active gas comprises any one of nitrogen, oxygen, methane; the pump laser includes any one of ultraviolet light, visible light, and infrared light.
9. The raman laser of claim 2, wherein the gas pressure regulating device comprises a gas cylinder; the gas cylinder is used for supplying Raman active gas into the wavelength converter.
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