CN104701722B - A kind of method for mid-infrared laser device hoisting power - Google Patents
A kind of method for mid-infrared laser device hoisting power Download PDFInfo
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- CN104701722B CN104701722B CN201510080081.5A CN201510080081A CN104701722B CN 104701722 B CN104701722 B CN 104701722B CN 201510080081 A CN201510080081 A CN 201510080081A CN 104701722 B CN104701722 B CN 104701722B
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Abstract
The invention discloses a kind of method for mid-infrared laser device hoisting power, when the laser is run, the power detection device monitors laser output power in real time, when the laser output power is more than critical power point, and the status register is in first state at this time, the power detection device transmits the first action signal to the transmission device, the quarter wave plate is removed light path by the transmission device, the Faraday rotator is moved into light path at the same time, the status register is placed in the second state at this time；When laser output power is less than critical power point, and the status register is in the second state at this time, the power detection device transmits the second action signal to the transmission device, the Faraday rotator is removed light path by the transmission device, the quarter wave plate is moved into light path at the same time, the status register returns to first state at this time.
Description
Technical field
The present invention relates to laser technology field, more particularly to a kind of method for infrared laser hoisting power.
Background technology
The wave band of 2~5um is not only the minimum air infrared window of decay, and also covers in this wave band numerous
The absworption peak of atom and molecule, so the laser of the wave band has spy in spectroscopy, remote sensing, military affairs, medical treatment environmental protection, communication aspects
Different important function.Infrared band is in the service band of most of medical detectors in 2~5um, is surveyed in laser guidance, remote sensing
The military field such as control, the laser radar of eye-safe, photoelectronic warfare has important application.It can be used for remote sensing in civil field
Sensing, air pollution control are learned, it can be also used for laser surgey of new generation, blood is condensed rapidly, and surgical wound surface is small, hemostasis
Property is good.Therefore the laser of the middle infrared band of research and development output peak power, excellent light quality quality is for national security and its people
Economic construction tool is of great significance.
In superpower laser, the pumping spectrum of laser diode and the absorption spectrum of solid state gain medium can be realized
Match somebody with somebody, but with the notable reinforcement of pumping optical power density in medium, fuel factor problem also highlights in laser operation.Laser
Hot conduction can form thermal gradient in laser medium in device, produce thermal stress, cause thermally induced birefringence, phase distortion, hot polymerization
Phenomena such as Jiao, thermal lens, seriously affect the output power and beam quality of laser.At present, more by being put in laser resonance intracavitary
Quarter wave plate or Faraday rotator are put with to compensate hot depolarization loss, but since compensation of the quarter wave plate to hot depolarization is with swashing
Luminous power increases, it lifts effect and gradually weakens, and compensation of the Faraday rotator to hot depolarization, is limited by Faraday rotator
Material property, at lower power compensation effect and unobvious relatively low in the transmitance of middle infrared wavelength section.Therefore, laser
The fuel factor of medium becomes the key factor that limitation mid-infrared laser device output energy and beam quality improve.
The content of the invention
It is excellent it is an object of the invention to solve at least the above and/or defect, and provide at least to will be described later
Point.
A further object of the invention is by a kind of method for mid-infrared laser device hoisting power, by for not
The compensation of different modes is carried out with operation power, the hot depolarization loss of mid-infrared laser device is greatly reduced, greatly improved
Its light light efficiency, optimizes beam quality.
In order to realize these purposes and further advantage according to the present invention, there is provided one kind is used for mid-infrared laser device and is lifted
The method of power, laser are generally mainly made of pumping source, coupler, gain media resonant cavity, of the present invention to swash
Light device is additionally provided with transmission compensation device and power detection device, and the transmission compensation device includes transmission device, passes through first
Adjusting bracket is fixed on the quarter wave plate of described transmission device one end and to be fixed on the transmission device by the second adjusting bracket another
The Faraday rotator at end, the power detection device is interior to be equipped with a status register；
Due to compensation of the quarter wave plate to hot depolarization, belong to and non-fully compensate, in the case where laser output power is less big
Compensation effect is good, and laser power lifting is obvious, but increases with laser power, it lifts effect and gradually weakens.And farad
Compensation of the circulator to hot depolarization, belongs to full remuneration, but is limited by the material of middle infrared band Faraday rotator at present
Expect characteristic, its transmitance is relatively low, therefore its compensation effect and unobvious, but the mistake lifted gradually in laser power at lower power
Cheng Zhong, its compensation effect are gradually lifted.There are a power points, quarter wave plate and farad during laser power is changed from small to big
Circulator is consistent to the compensation effect of hot depolarization, by testing to obtain this critical power point repeatedly, is written to transmission device
Control in program.
Before the laser is opened, the quarter wave plate is located in laser optical path, and the Faraday rotator is located at laser light
Outside road；
When the laser is opened, the status register is in first state；
When the laser is run, the power detection device monitors laser output power in real time, if described
Laser output power is more than critical power point, and the status register is in first state, the power detection device at this time
The transmission device is given to transmit the first action signal, the quarter wave plate is removed light path by the transmission device, while by the method
Circulator is drawn to move into light path, the status register is placed in the second state at this time；If the laser output power is more than critical
Power points, and the status register is in the second state at this time, then transmission device does not move, to ensure that whole system is steady
Property；
If laser output power is less than critical power point, and the status register is in the second state, the work(at this time
Rate detection device transmits the second action signal to the transmission device, and the Faraday rotator is removed light by the transmission device
Road, while the quarter wave plate is moved into light path, the status register returns to first state at this time；If laser output power is small
In critical power point, and the status register is in first state at this time, then transmission device does not move, to ensure whole system
Stationarity.
Preferably, wherein, first action signal and the second action signal are high level signal respectively and low
One kind in level signal, low level signal and high level signal or rising edge signal and trailing edge signal.
Preferably, wherein, monitoring of the power detection device to laser output power, is the input electricity to pumping source
Stream is monitored, pumping source control signal is monitored or to exporting one kind or more during laser beam splitter power is monitored
Kind.
Preferably, wherein, the critical power point is measured by experiment, and method is as follows：
The quarter wave plate and the Faraday rotator are removed into light path, draw laser output power curve map；
The quarter wave plate is moved into light path, laser output power curve map at this time is drawn, so as to obtain 1/4 ripple
Piece is to laser power lifting curve figure；
The quarter wave plate is removed into light path and the Faraday rotator is moved into light path, draws laser output at this time
Power graph, so as to obtain the Faraday rotator to laser power lifting curve figure；
Laser power lifting curve figure and the Faraday rotator put forward laser power by the quarter wave plate
Rise curve map, obtain the quarter wave plate and the Faraday rotator power points equal to laser power lifting effect, to obtain the final product
To critical power point, by the pumping source input current value under this laser power, the pumping source current controling signal or institute
One or more of output laser beam splitter performance number is stated to be written in the control program of the power detection device.
The present invention includes at least following beneficial effect：
The present invention lifts laser power the equal critical power of effect by measuring quarter wave plate and Faraday rotator
Point, and be written into the control program of transmission device, the compensation of different modes is carried out for different operation power, greatly
Reduce the hot depolarization loss of mid-infrared laser device, effectively increase the output energy of laser, its light light efficiency greatly improved
Rate.The configuration of the present invention is simple, ingenious in design, stability is good, applied widely, can meet application demand very well.
The further advantage of the present invention, target and feature embody part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the structure diagram of one embodiment of the present of invention mid-infrared laser device；
Fig. 2 is the structure diagram that compensation device is driven in one embodiment of the present of invention；
Fig. 3 be one embodiment of the present of invention in when measuring critical power point, obtain respectively do not compensate, 1/4 ripple
Piece compensates and the curve map under Faraday rotator compensation condition；
Fig. 4 is not compensated under different pumping energies in one embodiment of the present of invention and carry out hot depolarization using the present invention
Output laser pulse energy under compensation condition.
In figure：1st, total reflective mirror, 2, transmission compensation device, 3, power detection device, the 4, first fiber coupling lens, 5, pumping
Source, 6, gain media, the 7, second fiber coupling lens, 8, the polarizer, 9, electro-optic Q-switched crystal, the 10, the 3rd fiber coupling lens,
11st, outgoing mirror, 21, quarter wave plate, the 22, first adjustment frame, 23, Faraday rotator, 24, second adjustment frame, 25, transmission device.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of other elements or its combination.
Figures 1 and 2 show that a kind of way of realization, the mid-infrared laser device include total reflective mirror 1, the according to the present invention
One fiber coupling lens 4, pumping source 5, gain media 6, the second fiber coupling lens 7, the polarizer 8, electro-optic Q-switched crystal the 9, the 3rd
Transmission compensation device 2 and power are additionally provided between fiber coupling lens 10 and outgoing mirror 11, wherein total reflective mirror 1 and outgoing mirror 11
Detection device 3, the transmission compensation device 2 include transmission device 25, are fixed on the transmission device by the first adjusting bracket 22
The quarter wave plate 21 of 25 one end and the Faraday rotator that 25 other end of transmission device is fixed on by the second adjusting bracket 24
23, the power detection device 3 is interior to be equipped with a status register；
Before the laser is opened, the quarter wave plate 21 is located in laser optical path, and the Faraday rotator 23 is positioned at sharp
Outside light light path；
When the laser is opened, the status register is in first state；
When the laser is run, the power detection device 3 monitors laser output power in real time, if described
Laser output power is more than critical power point, and the status register is in first state, the power detection device 3 at this time
The first action signal is transmitted to the transmission device 25, the quarter wave plate 21 is removed light path by the transmission device 25, at the same time will
The Faraday rotator 23 moves into light path, and the status register is placed in the second state at this time；If laser output power is less than
Critical power point, and the status register is in the second state at this time, the power detection device 3 gives the transmission device 25
Transmitting the second action signal, the Faraday rotator 23 is removed light path by the transmission device, while by the quarter wave plate 21
Light path is moved into, the status register returns to first state at this time.
In this scheme, due to compensation of the quarter wave plate 21 to hot depolarization, belong to and non-fully compensate, in laser output work
Compensation effect is good in the case that rate is less big, and laser power lifting is obvious, but increases with laser power, it lifts effect
Gradually weaken.And compensation of the Faraday rotator 23 to hot depolarization, belong to full remuneration, but infrared band in being limited by present
The material property of Faraday rotator, its transmitance is relatively low, therefore its compensation effect and unobvious, but in laser at lower power
During power is lifted gradually, its compensation effect is gradually lifted.There is a power during laser power is changed from small to big
Point, quarter wave plate 21 is consistent to the compensation effect of hot depolarization with Faraday rotator 23, by testing to obtain this critical power repeatedly
Point, is written in the control program of transmission device.
In such scheme, first action signal and the second action signal include a variety of ways of realization, example respectively
Such as, the first action signal and the action signal can be high level signal and low level signal, low level signal and height respectively
One kind in level signal or rising edge signal and trailing edge signal.
In such scheme, monitoring of the power detection device 3 to laser output power includes a variety of implementations, example
Such as, monitoring of the power detection device 3 to laser output power is that the input current of pumping source 5 is monitored, to pumping
5 control signal of source is monitored or to exporting the one or more during laser beam splitter power is monitored.
In such scheme, the critical power point can be measured by experiment, and Fig. 3 shows a kind of its way of realization：
The quarter wave plate 21 and the Faraday rotator 23 are removed into light path, draw laser output power curve map,
That is the non-compensated curve in Fig. 3；
The quarter wave plate 21 is moved into light path, draws laser output power curve map at this time, so as to obtain described 1/4
Wave plate 21 is to laser power lifting curve figure；
The quarter wave plate 21 is removed into light path and the Faraday rotator 23 is moved into light path, draws laser at this time
Output power curve figure, so as to obtain the Faraday rotator 23 to laser power lifting curve figure；
By the quarter wave plate 21 to laser power lifting curve figure and the Faraday rotator 23 to laser work(
Rate lifting curve figure, obtains the quarter wave plate 21 work(equal to laser power lifting effect with the Faraday rotator 23
Rate point, that is, obtain critical power point 86w, by the pumping source input current value under this laser power, pumping source current controling signal
Or one or more of output laser beam splitter performance number is written in the control program of the power detection device 3.
By Fig. 3 it can also be seen that compensation of the quarter wave plate to hot depolarization increases with laser power, it is gradual that it lifts effect
Weaken.And compensation of the Faraday rotator to hot depolarization, at lower power compensation effect and unobvious, but in laser power gradually
During gradually being lifted, its compensation effect is gradually lifted.
Fig. 4 shows that under different pump pulse energy laser is not compensating and compensation method situation of the present invention respectively
The pulsed laser energy of lower output, it can be seen that method using the present invention carries out thermal depolarization compensation to laser and significantly reduces
The loss of laser, improves the output energy of laser.In the case where pump energy is 200J, laser exports arteries and veins before and after compensation
It is respectively 347mJ and 462mJ to rush energy, improves 33.14%.
Number of devices and treatment scale described herein are the explanations for simplifying the present invention.The a kind of of the present invention is used
Application, modifications and variations in the method for mid-infrared laser device hoisting power are apparent to one skilled in the art
's.
As described above, according to the present invention, effect phase is lifted to laser power by measuring quarter wave plate and Faraday rotator
Deng critical power point, and be written into the control program of transmission device, different modes carried out for different operation power
Compensation, greatly reduce mid-infrared laser device hot depolarization loss, effectively increase the output energy of laser, significantly carry
Its high light light efficiency.The configuration of the present invention is simple, ingenious in design, stability is good, applied widely, can meet to apply need very well
Ask.
Although embodiment of the present invention is disclosed as above, it is not limited in listed fortune in specification and embodiment
With it can be applied to various suitable the field of the invention completely, can be easily real for those skilled in the art
Now other modification, therefore under the universal limited without departing substantially from claim and equivalency range, the present invention is not limited to
Specific details and shown here as the legend with description.
Claims (4)
- A kind of 1. method for mid-infrared laser device hoisting power, it is characterised in that the total reflective mirror of the laser and first Transmission compensation device and power detection device are provided between fiber coupling lens,The transmission compensation device includes:Transmission device；The quarter wave plate of described transmission device one end is fixed on by the first adjusting bracket；And the Faraday rotator of the transmission device other end is fixed on by the second adjusting bracket；A status register is equipped with the power detection device；Before the laser is opened, the quarter wave plate is located in laser optical path, and the Faraday rotator is located at laser optical path Outside；When the laser is opened, the status register is in first state；When the laser is run, the power detection device monitors laser output power in real time, when the laser Output power is more than critical power point, and the status register is in first state at this time, and the power detection device is to institute To state transmission device and transmit the first action signal, the quarter wave plate is removed light path by the transmission device, while by the faraday Circulator moves into light path, and the status register is placed in the second state at this time；When laser output power is less than critical power point, and The status register is in the second state at this time, and the power detection device transmits the second action letter to the transmission device Number, the Faraday rotator is removed light path by the transmission device, while the quarter wave plate is moved into light path, described at this time Status register returns to first state.
- 2. it is used for the method for mid-infrared laser device hoisting power as claimed in claim 1, it is characterised in that first action Signal and the second action signal be respectively high level signal and low level signal, low level signal and high level signal or One kind in rising edge signal and trailing edge signal.
- 3. it is used for the method for mid-infrared laser device hoisting power as claimed in claim 1, it is characterised in that the power detection Monitoring of the device to laser output power, is that the input current of pumping source is monitored, pumping source control signal is supervised One or more in surveying or being monitored to output laser beam splitter power.
- 4. it is used for the method for mid-infrared laser device hoisting power as claimed in claim 3, it is characterised in that the critical power Point, is measured, method is as follows by experiment：The quarter wave plate and the Faraday rotator are removed into light path, draw laser output power curve map；The quarter wave plate is moved into light path, laser output power curve map at this time is drawn, so as to obtain the quarter wave plate pair Laser power lifting curve figure；The quarter wave plate is removed into light path and the Faraday rotator is moved into light path, draws laser output power at this time Curve map, so as to obtain the Faraday rotator to laser power lifting curve figure；Laser power lifting curve figure and the Faraday rotator lift laser power by the quarter wave plate bent Line chart, obtains the quarter wave plate and the Faraday rotator power points equal to laser power lifting effect, that is, is faced Boundary's power points, by the pumping source input current value under this laser power, the pumping source control signal or output laser beam splitter work( One or more of rate value is written in the control program of the power detection device.
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| CN104701722B true CN104701722B (en) | 2018-04-17 |
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| US5640406A (en) * | 1993-11-05 | 1997-06-17 | Trw Inc. | Birefringence compensated laser architecture |
| CN1825721A (en) * | 2005-02-22 | 2006-08-30 | 中国科学院福建物质结构研究所 | High-power high-quality solid laser |
| CN1829011A (en) * | 2006-04-12 | 2006-09-06 | 中国科学院上海光学精密机械研究所 | Thermal depolarization compensation resonant cavity of high power E-O Q-switch solid laser |
| CN102593696A (en) * | 2012-03-01 | 2012-07-18 | 长春理工大学 | Birefringent compensating resonant cavity with double wave plates |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3585891B2 (en) * | 2002-02-01 | 2004-11-04 | 独立行政法人 科学技術振興機構 | Laser element |
-
2015
- 2015-02-14 CN CN201510080081.5A patent/CN104701722B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2037064A (en) * | 1978-12-15 | 1980-07-02 | Commw Of Australia | Lasers |
| US5640406A (en) * | 1993-11-05 | 1997-06-17 | Trw Inc. | Birefringence compensated laser architecture |
| CN1825721A (en) * | 2005-02-22 | 2006-08-30 | 中国科学院福建物质结构研究所 | High-power high-quality solid laser |
| CN1829011A (en) * | 2006-04-12 | 2006-09-06 | 中国科学院上海光学精密机械研究所 | Thermal depolarization compensation resonant cavity of high power E-O Q-switch solid laser |
| CN102593696A (en) * | 2012-03-01 | 2012-07-18 | 长春理工大学 | Birefringent compensating resonant cavity with double wave plates |
Non-Patent Citations (1)
| Title |
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| 高能电光调Q Cr，Tm，Ho:YAG激光器;杨杰等;《激光与红外》;20130228;第43卷(第2（2013）期);第167-170页 * |
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