CN113594832B - Laser diode pumping axial alkali metal vapor laser and laser generation method - Google Patents
Laser diode pumping axial alkali metal vapor laser and laser generation method Download PDFInfo
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- CN113594832B CN113594832B CN202110860587.3A CN202110860587A CN113594832B CN 113594832 B CN113594832 B CN 113594832B CN 202110860587 A CN202110860587 A CN 202110860587A CN 113594832 B CN113594832 B CN 113594832B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/031—Metal vapour lasers, e.g. metal vapour generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/036—Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering, replenishing; Means for circulating the gas, e.g. for equalising the pressure within the tube
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094049—Guiding of the pump light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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Abstract
The invention discloses a laser diode pumping axial alkali metal vapor laser and a laser generation method, wherein the laser diode pumping axial alkali metal vapor laser comprises: a circulating flow path structure comprising: an alkali metal evaporation collector; the circulating flow channel is communicated with the alkali metal evaporation collector and comprises a first flow channel, a second flow channel and a core flow channel area which are communicated; the temperature control ring and the driving device are positioned between the first flow passage and the second flow passage; a pumping structure, comprising: a laser diode; the aspheric focusing lens is arranged in the core runner area; and a resonant cavity, an optical axis of which is coaxial with an axial direction of the core flow channel region; the direction of the laser output by the resonant cavity is collinear with the focus of the pump light, and the flowing direction of the alkali metal vapor in the core flow channel area is the same as or opposite to the direction of the laser.
Description
Technical Field
The invention relates to a laser technology, in particular to a laser diode pumping axial alkali metal vapor laser and a laser generation method.
Background
A Laser Diode Pumped Alkali metal vapor Laser (DPAL) is a new type of optical pumping gas Laser that has been proposed in recent years. The gain medium is an alkali metal (mainly potassium (K), rubidium (Rb), cesium (Cs)) in a vapor state. K. The energy level transition structures of gain media in the Rb and Cs laser diode pumping alkali metal vapor laser are the same. Fig. 1 is a schematic diagram of energy level transitions of a gain medium in DPAL. As shown in FIG. 1, n is an outermost electron position of an alkali metal atomAnd n corresponding to K, Rb and Cs is 4, 5 and 6 respectively in the number of the electron layers. nS1/2Is the ground state energy level, nP1/2And nP3/2An excited state energy level that is cleaved for the outermost electron spin-orbit interaction. The D2 and D1 lines correspond to the pumping and lasing transitions of the gain medium, respectively.
DPAL has more than 95% of quantum efficiency, the gain medium is gas, the optical uniformity is good, the heat can be dissipated in a flowing mode, high-power and high-beam-quality laser output is expected to be achieved, and the DPAL has wide application prospects in the aspects of laser processing, laser energy transfer, photoelectric countermeasure, laser weapons and the like.
The flow of the gain medium to solve the heat dissipation problem is the main technical means for realizing high power output by the DPAL. The technical means employed by the related DPAL are all lateral flow, i.e. the flow direction of the gain medium is perpendicular to the optical axis of the laser. Fig. 2 is a schematic view of a cross-flow DPAL. As shown in fig. 2, the gas flow is in the direction u, while the laser is in the direction L, perpendicular to the gas flow direction. The technical route of the gain medium transverse flow is beneficial to obtaining large gain volume and high power-weight ratio (power/volume), and is suitable for developing ultra-high power DPAL to meet the application requirements of laser weapons and the like. However, the beam quality is low, the laser output of the fundamental mode is difficult to realize, and the laser processing method is not suitable for application such as laser processing and laser cutting.
Disclosure of Invention
It is therefore an object of the present invention to provide an axial alkali metal vapor laser using a laser diode pump and a laser generating method, which are aimed at least partially solving at least one of the above-mentioned problems.
To achieve the above object, as a first aspect of the present invention, there is provided a laser diode pumped axial alkali metal vapor laser comprising: a circulating flow path structure comprising: an alkali metal evaporation collector for generating or collecting alkali metal vapor; the circulating flow channel is filled with pre-filled buffer gas, is communicated with the alkali metal evaporation collector and is used for enabling the generated alkali metal steam to circularly flow and comprises a first flow channel, a second flow channel and a core flow channel area which are communicated; a temperature control ring for controlling the temperature of the alkali metal vapor in the core flowpath region, and a drive means located between the first and second flowpaths for driving the alkali metal vapor to circulate in the recirculation flowpath; a pumping structure, comprising: a laser diode for providing pump light; the aspheric focusing lens is arranged in the core runner area and used for focusing the pumping light incident on the aspheric focusing lens, so that the number of particles of the alkali metal vapor in the core runner area is reversed, and laser is generated; the optical axis of the resonant cavity is coaxial with the axial direction of the core flow channel region, and the laser generated by the alkali metal steam excited by the pump light in the core flow channel region is output after being oscillated by the resonant cavity; the direction of the laser output by the resonant cavity is collinear with the focus of the pump light, and the flowing direction of the alkali metal vapor in the core flow channel region is the same as or opposite to the direction of the laser.
As a second aspect of the present invention, there is also provided a method of lasing a laser diode pumped axial alkali metal vapor laser as described above, comprising: generating alkali metal vapor by using an alkali metal evaporation collector and flowing into the first flow channel; the alkali metal vapor entering the first flow channel flows into the core flow channel area through the second flow channel under the driving of the driving device; controlling the temperature of the alkali metal vapor entering the core flow channel region with a temperature control loop; focusing the pump light by using an aspheric focusing lens, so that the number of particles of the alkali metal steam in the core runner area is reversed, and laser is generated; oscillating and outputting the laser light in a resonant cavity; the direction of the laser output by the resonant cavity is collinear with the focus of the pump light, and the flow direction of the alkali metal vapor in the core flow channel region is the same as or opposite to the direction of the laser.
According to the technical scheme, the laser diode pumping axial alkali metal vapor laser and the laser generation method have one or part of the following beneficial effects:
(1) according to the laser diode pumping axial alkali metal vapor laser, the direction of the laser output by the resonant cavity is collinear with the focus of the pump light, the flowing direction of the alkali metal vapor in the core runner region is the same as or opposite to the direction of the laser, so that parameters of the pump light, such as line width, power density distribution and the like, and all parameters of hydromechanics parameters of a gain medium, such as alkali metal flow rate, thermodynamic parameters, such as temperature, density, pressure intensity, flow rate and the like, are symmetrically distributed by taking the optical axis of the resonant cavity as a symmetric central axis, namely are radially symmetric, and the laser diode pumping axial alkali metal vapor laser is beneficial to obtaining better beam quality and realizing laser output of a fundamental mode.
(2) The laser diode pumping axial alkali metal vapor laser is provided with pre-filled buffer gas in a circulating flow channel, and the buffer gas can enable the alkali metal vapor to better absorb pumping light, so that population inversion is generated.
Drawings
FIG. 1 is a schematic diagram of energy level transitions of a gain medium in a DPAL;
FIG. 2 is a schematic illustration of a cross-flow DPAL;
FIG. 3 is a diagram of a laser diode pumped axial alkali metal vapor laser apparatus of the present invention;
FIG. 4a is a state of the shutter of the inventive laser diode pumped axial alkali metal vapor laser opened;
fig. 4b shows the shutter of the inventive laser diode pumped axial alkali metal vapor laser in the closed position.
Description of the reference numerals
1 temperature control ring
2 upstream flow path
3 downstream flow channel
4 heat exchanger
5 alkali metal evaporation collector
6 blower
7 baffle
8 aspheric focusing lens
9 total reflection lens
10 laser output lens
11 sub-core flow channel region
12Y-shaped pipeline
Detailed Description
In the process of implementing the invention, the design in the alkali metal vapor laser leads the direction of the laser output by the resonant cavity to be collinear with the focus of the pump light, leads the flowing direction of the alkali metal vapor in the core runner region to be the same as or opposite to the direction of the laser, can output the laser with better quality, and can realize the laser output of the fundamental mode.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings in combination with the embodiments.
According to an embodiment of the present invention, there is provided a laser diode pumped axial alkali metal vapor laser, comprising: a circulating flow path structure comprising: an alkali metal evaporation collector for generating or collecting alkali metal vapor; a circulating flow passage filled with pre-filled buffer gas, communicated with the alkali metal evaporation collector and used for circulating the generated alkali metal vapor, and comprising a first flow passage (namely a downstream flow passage), a second flow passage (namely an upstream flow passage) and a core flow passage area which are communicated; a temperature control ring for controlling the temperature of the alkali metal vapor in the core flow channel region, and a drive device located between the first flow channel and the second flow channel for driving the alkali metal vapor to circulate in the circulation flow channel; a pumping structure, comprising: a laser diode for providing pump light; the aspheric focusing lens is arranged in the core runner area and used for focusing the pumping light incident on the aspheric focusing lens, so that the number of particles of the alkali metal steam in the core runner area is reversed, and laser is generated; the optical axis of the resonant cavity is coaxial (collinear or parallel) with the axial direction of the core flow channel region, and the laser generated by the alkali metal steam excited by the pump light in the core flow channel region is output after being oscillated by the resonant cavity; the direction of the laser output by the resonant cavity is collinear with the focus of the pump light, and the flowing direction of the alkali metal vapor in the core flow channel area is the same as or opposite to the direction of the laser.
The direction of the laser output by the resonant cavity is collinear with the focus of the pump light, and the flowing direction of the alkali metal vapor in the core runner region is the same as or opposite to the direction of the laser, so that parameters of the pump light, such as line width, power density distribution and the like, and all parameters of the hydromechanics parameters of the gain medium, such as alkali metal flow rate, thermodynamic parameters, such as temperature, density, pressure intensity, flow rate and the like of the alkali metal gas, are symmetrically distributed by taking the optical axis as a symmetric central axis, namely, the radial symmetry is favorable for obtaining better beam quality, and the laser output of a fundamental mode is realized. The laser diode pumping axial alkali metal vapor laser is also filled with pre-filled buffer gas such as helium, so that the absorption line width of a gain medium (alkali metal vapor) can be increased to better absorb pump light.
According to an embodiment of the present invention, the circulation flow path structure further includes: a heat exchanger disposed on the first flow passage for controlling the temperature of the alkali metal vapor in the first flow passage; the Y-shaped pipeline is arranged between the first flow channel and the alkali metal evaporation collector and comprises two first ports communicated with the first flow channel and a second port communicated with the alkali metal evaporation collector; the baffle is arranged on the first flow passage and positioned between the two first ports of the Y-shaped pipeline, and can be switched between an opening state and a closing state; wherein when the damper is opened, the alkali metal vapor circulates in the circulation flow path through the first flow path; when the baffle plate is closed, the alkali metal vapor in the first flow passage flows through the Y-shaped pipe and is condensed and recycled to the alkali metal evaporation collector.
When the baffle is opened, the heat exchanger keeps the gas in the downstream flow passage in a high-temperature state, namely, the temperature of the alkali metal steam in the downstream flow passage is kept lower than about 10 ℃ of the core flow passage area, when the baffle is closed, the heat of the alkali metal steam in the downstream flow passage can be dissipated through the heat exchanger along with the flowing of the gas, so that the temperature of the alkali metal steam in the downstream flow passage is reduced, the alkali metal steam enters the alkali metal evaporation collector after being condensed near the Y-shaped pipe, and the collection of the alkali metal steam is completed.
According to the embodiment of the invention, the number of the circulating flow channel structures is at least one, and the circulating flow channel structures are arranged in parallel corresponding to the same resonant cavity, so that the laser output efficiency is improved.
According to an embodiment of the present invention, the number of the second flow channels in each circulation flow channel structure is one or two; when the number of the second flow channels is one, the number of the aspheric focusing lenses is a pair, and the aspheric focusing lenses are respectively arranged at two ends of the core flow channel area; when the number of the second flow channels is two, the core flow channel area is divided into two sub-core flow channel areas which are respectively communicated with the two second flow channels, the number of the aspheric focusing lenses is one pair and is respectively arranged at two ends of the core flow channel area, the number of the aspheric focusing lenses is two pairs, and one pair of the aspheric focusing lenses is arranged at two ends of one sub-core flow channel area.
When there are two upstream flow channels, the alkali metal vapor in each sub-core flow channel region flows in the axial direction toward each other.
According to the embodiment of the invention, the resonant cavity comprises a total reflection lens and a laser output lens which are respectively positioned at two sides of the core flow channel area and are arranged in a collinear way.
According to an embodiment of the present invention, the alkali metal vapor is Cs vapor, Rb vapor, K vapor.
According to an embodiment of the invention, the driving device is a fan.
According to an embodiment of the invention, the flow velocity of the fan is greater than 100 m/s. The fan power is big, and the gas velocity of flow is fast, and the heat-sinking capability is strong, reduces the thermal deposition, and then can improve laser power.
According to an embodiment of the invention, the first flow channel, the second flow channel and the core flow channel region are stainless steel flow channels.
According to an embodiment of the present invention, there is also provided a method of lasing with the above laser diode pumped axial alkali metal vapor laser, including:
generating alkali metal vapor by using an alkali metal evaporation collector and flowing into the first flow channel; the alkali metal vapor entering the first flow channel flows into the core flow channel area through the second flow channel under the driving of the driving device; controlling the temperature of the alkali metal vapor entering the core runner zone by a temperature control loop; focusing the pump light by using an aspheric focusing lens, so that the number of particles of the alkali metal vapor in the core runner area is reversed, and laser is generated; oscillating and outputting laser in the resonant cavity; the first flow channel, the second flow channel and the core flow channel area are filled with pre-filled buffer gas, the direction of laser output by the resonant cavity is collinear with the focus of pump light focusing, and the flowing direction of alkali metal vapor in the core flow channel area is the same as or opposite to the direction of the laser.
According to an embodiment of the present invention, the method for generating laser light by using the above laser diode pumped axial alkali metal vapor laser further comprises: when the laser diode pumping axial alkali metal vapor laser works, the baffle is opened, so that the alkali metal vapor is subjected to temperature control through the heat exchanger and then flows through the first flow channel to circulate in the circulating flow channel; when the laser diode pump axial alkali metal vapor laser stops working, the baffle plate is closed, so that the alkali metal vapor is condensed and recycled to the alkali metal evaporation collector after flowing through the Y-shaped pipeline after the temperature of the alkali metal vapor is controlled by the heat exchanger.
The technical solution of the present invention will be described in detail below with reference to specific examples. It should be noted that the following specific examples are only for illustration and are not intended to limit the invention.
Example 1
Fig. 3 is a diagram of a laser diode pumped axial alkali metal vapor laser apparatus of the present invention. As shown in fig. 3, the laser diode pumped axial alkali metal vapor laser circulation flow channel structure of the present invention includes: an alkali metal evaporation collector 5 for generating or collecting alkali metal vapor; the circulating flow channel is communicated with the alkali metal evaporation collector 5 and is used for enabling the generated alkali metal steam to flow circularly, and comprises a downstream flow channel 3, an upstream flow channel 2 and a core flow channel area which are communicated; a temperature control ring 1 for controlling the temperature of the alkali metal vapor in the core flow channel region; a fan 6 located between the downstream flow channel 3 and the upstream flow channel 2 and used for driving the alkali metal vapor to circularly flow in the circulating flow channel; a laser diode for providing pump light; the aspheric focusing lens 8 is arranged in the core runner area and used for focusing the pump light incident on the aspheric focusing lens 8, so that the number of particles of the alkali metal vapor in the core runner area is reversed, and laser is generated; the optical axis of the resonant cavity is coaxial with the axial direction of the core flow channel region, and the laser generated by the alkali metal steam excited by the pump light in the core flow channel region is output after being oscillated by the resonant cavity; the direction of the laser output by the resonant cavity is collinear with the focus of the pump light, and the flowing direction of the alkali metal vapor in the core flow channel area is the same as or opposite to the direction of the laser. A heat exchanger 4 disposed downstream for controlling the temperature of the alkali metal vapor in the downstream flow channel 3; a Y-shaped pipeline 12 arranged between the downstream flow channel 3 and the alkali metal evaporation collector 5 and comprising two first ports communicated with the downstream flow channel 3 and a second port communicated with the alkali metal evaporation collector 5; the baffle 7 is disposed on the downstream flow channel and between the two first ports of the Y-shaped pipe 12, and can be switched between an open state and a closed state, and fig. 4a shows a state where the baffle of the laser diode pumping axial alkali metal vapor laser of the present invention is open. Fig. 4b shows the shutter of the inventive laser diode pumped axial alkali metal vapor laser in the closed position. When the baffle 7 is opened as shown in FIG. 4a, the alkali metal vapor circulates in the circulation flow path through the downstream flow path 3, and when the baffle is closed, the alkali metal vapor in the downstream flow path 3 is condensed and recovered to the alkali metal evaporation collector 5 through the Y-shaped pipe 12 as shown in FIG. 4 b. The number of the upstream flow channels 2 is two, the core flow channel area is divided into two sub-core flow channel areas 11 which are respectively communicated with the two upstream flow channels 2, and the two pairs of aspheric focusing lenses 8 of the upstream flow channels 2 are respectively arranged at two ends of the sub-core flow channel areas 11.
When the device is ready for operation, the circulating flow channel is filled with buffer gas in advance, the temperature control ring 1 and the heat exchanger 4 are opened to control the temperature, the core flow channel area 11 is controlled at the optimal temperature (Cs 120 ℃, Rb 150 ℃ and K200 ℃) generated by alkali metal vapor laser, and the temperature of the downstream flow channel 3 is lower than that of the core flow channel area by about 10 ℃. The fan 6 is turned on to cause the buffer gas to flow in the direction of the arrow in fig. 3. The alkali metal evaporation collector 5 is heated to generate alkali metal vapor, which is mixed with the buffer gas and flows together. When the device works, the baffle is taken away, pumping light is injected, and the number of particles of alkali metal vapor can be reversed in the core flow channel area, so that laser is generated. The generated heat is dissipated through the heat exchanger 4 as the gases (alkali metal vapor and buffer gas) flow. When the work is stopped, the baffle 7 is placed, and the gas passes through the Y-shaped pipeline 12. When the temperature is reduced, the alkali metal vapor can be condensed near the Y-shaped pipeline 12 and then flows into the alkali metal evaporation collector 5, and the collection of the alkali metal is completed. The temperature control loop, heat exchanger and fan are then turned off.
The material of the circulating flow channel is stainless steel, gas flows in the two sub-core flow channel regions 11 in opposite directions, and a window sheet is opened at the position where the pump light is incident, so that the pump light can be incident. The resonant cavity is composed of a total reflection lens 9 and a laser output lens 10, an aspheric focusing lens 8 is arranged in the stainless steel flow channel, a hole is formed in the center of the aspheric focusing lens, the generation of laser cannot be blocked, the aspheric focusing lens focuses pump light incident from the side surface on the axial direction, and the alkali metal vapor generates population inversion in a core flow channel area. The temperature control ring 1 is sleeved on two sides of the core runner area and used for controlling the temperature of the core runner area. A heat exchanger 4 is located in the downstream flow path for heat dissipation. The fan is positioned at the bottom of the flow channel to enable the gas to flow. An alkali metal evaporation collector is connected to the downstream flow path by a small Y-shaped pipe beside the downstream flow path for generating and collecting alkali metal vapor. The baffle is placed in the middle of the Y-shaped pipe in the downstream flow passage in the preparation and stop states and is pulled away in the working state. Under the structure, the pump light, the gas flow and the laser are in the same direction, and the gas flows oppositely in the axial direction in the core runner area, so that the high symmetry in the radial direction and the axial direction is obtained, good mode matching and rapid heat dissipation can be realized, and the output of the fundamental mode laser is further realized.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A laser diode pumped axial alkali metal vapor laser comprising:
a circulating flow path structure comprising:
an alkali metal evaporation collector for generating or collecting alkali metal vapor;
the circulating flow channel is filled with pre-filled buffer gas, is communicated with the alkali metal evaporation collector and is used for enabling the generated alkali metal steam to circularly flow and comprises a first flow channel, a second flow channel and a core flow channel area which are communicated;
a temperature control ring for controlling the temperature of the alkali metal vapor in the core flow channel region, an
A driving device, which is positioned between the first flow passage and the second flow passage and is used for driving the alkali metal vapor to circularly flow in the circulating flow passage;
a pumping structure, comprising:
a laser diode for providing pump light; and
the aspheric focusing lens is arranged in the core runner area and used for focusing the pumping light incident on the aspheric focusing lens, so that the number of particles of the alkali metal vapor in the core runner area is reversed, and laser is generated; and
the optical axis of the resonant cavity is coaxial with the axial direction of the core flow channel region, and laser generated by the alkali metal vapor in the core flow channel region through the excitation of the pump light is output after being oscillated by the resonant cavity;
the direction of the laser output by the resonant cavity is collinear with the focus of the pump light, and the flow direction of the alkali metal vapor in the core flow channel region is the same as or opposite to the direction of the laser;
wherein, circulation flow channel structure still includes:
a heat exchanger disposed in the first flow channel for controlling a temperature of the alkali metal vapor in the first flow channel;
the Y-shaped pipeline is arranged between the first flow channel and the alkali metal evaporation collector and comprises two first ports communicated with the first flow channel and a second port communicated with the alkali metal evaporation collector;
the baffle is arranged on the first flow channel, is positioned between the two first ports of the Y-shaped pipeline and can be switched between an opening state and a closing state;
wherein the alkali metal vapor circulates in the circulation flow passage through the first flow passage when the shutter is opened; when the baffle plate is closed, the alkali metal vapor in the first flow passage flows through the Y-shaped pipe and is condensed and recycled to the alkali metal evaporation collector.
2. The laser diode pumped axial alkali metal vapor laser of claim 1, wherein the buffer gas is helium.
3. The laser diode pumped axial alkali metal vapor laser of claim 1, wherein the number of said circulating flow channel structures is at least one and is juxtaposed corresponding to the same said resonant cavity.
4. The laser diode pumped axial alkali metal vapor laser of claim 3, wherein the number of second flow channels in each of the circulating flow channel structures is one or two;
when the number of the second flow channels is one, the number of the aspheric focusing lenses is a pair, and the aspheric focusing lenses are respectively arranged at two ends of the core flow channel area;
when the number of the second flow channels is two, the core flow channel area is divided into two sub-core flow channel areas which are respectively communicated with the two second flow channels, the number of the aspheric focusing lenses is one pair and is respectively arranged at two ends of the core flow channel area, or the aspheric focusing lenses are two pairs, and one pair of the aspheric focusing lenses is arranged at two ends of one sub-core flow channel area.
5. The laser diode pumped axial alkali metal vapor laser of claim 1, wherein the alkali metal vapor is Cs vapor, Rb vapor, K vapor;
the first runner, the second runner, and the core runner region are stainless steel runners.
6. The laser diode pumped axial alkali metal vapor laser of claim 1, wherein the driving means is a fan.
7. The laser diode pumped axial alkali metal vapor laser of claim 6, wherein the flow velocity of the fan is greater than 100 m/s.
8. A method of lasing a laser diode pumped axial alkali metal vapor laser as claimed in any of claims 1 to 7 comprising:
generating alkali metal vapor by using an alkali metal evaporation collector and flowing into the first flow channel;
the alkali metal vapor entering the first flow channel flows into the core flow channel area through the second flow channel under the driving of the driving device;
controlling the temperature of the alkali metal vapor entering the core flow channel region with a temperature control loop;
focusing the pump light by using an aspheric focusing lens, so that the alkali metal vapor in the core runner area generates ion number reversal, and further generates laser;
oscillating and outputting the laser light in a resonant cavity;
the first flow channel, the second flow channel and the core flow channel area are filled with buffer gas in advance, the direction of the laser output by the resonant cavity is collinear with the focus of the pump light, and the flowing direction of the alkali metal vapor in the core flow channel area is the same as or opposite to the direction of the laser.
9. The method of claim 8, wherein the method further comprises:
when the laser diode pumping axial alkali metal vapor laser works, the baffle is opened, so that the alkali metal vapor is subjected to temperature control through the heat exchanger, then flows through the first flow channel and circulates in the circulating flow channel;
when the laser diode pumping axial alkali metal vapor laser stops working, the baffle plate is closed, so that the alkali metal vapor is subjected to temperature control by the heat exchanger, flows through the Y-shaped pipeline, is condensed and is recycled to the alkali metal evaporation collector.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022888A (en) * | 2012-12-21 | 2013-04-03 | 中国科学院长春光学精密机械与物理研究所 | Alkali metal steam laser of polarized optical pumping |
| CN105552693A (en) * | 2016-02-22 | 2016-05-04 | 中国科学院电子学研究所 | DPAL laser with local bidirectional alternative flowing gain medium |
| CN108039642A (en) * | 2017-11-07 | 2018-05-15 | 西南技术物理研究所 | A kind of continuous output alkali metal steam laser of dual wavelength |
| CN108039641A (en) * | 2017-11-07 | 2018-05-15 | 西南技术物理研究所 | A kind of alkali metal vapour laser of dual wavelength double modulation |
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| US9048617B2 (en) * | 2012-07-11 | 2015-06-02 | Logos Technologies, Llc | Metal vapor circulating system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022888A (en) * | 2012-12-21 | 2013-04-03 | 中国科学院长春光学精密机械与物理研究所 | Alkali metal steam laser of polarized optical pumping |
| CN105552693A (en) * | 2016-02-22 | 2016-05-04 | 中国科学院电子学研究所 | DPAL laser with local bidirectional alternative flowing gain medium |
| CN108039642A (en) * | 2017-11-07 | 2018-05-15 | 西南技术物理研究所 | A kind of continuous output alkali metal steam laser of dual wavelength |
| CN108039641A (en) * | 2017-11-07 | 2018-05-15 | 西南技术物理研究所 | A kind of alkali metal vapour laser of dual wavelength double modulation |
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