CN105514791B - The multiple laser aid and method for adjusting Q to generate adjustable series impulse of square wave pumping - Google Patents
The multiple laser aid and method for adjusting Q to generate adjustable series impulse of square wave pumping Download PDFInfo
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- CN105514791B CN105514791B CN201610035412.8A CN201610035412A CN105514791B CN 105514791 B CN105514791 B CN 105514791B CN 201610035412 A CN201610035412 A CN 201610035412A CN 105514791 B CN105514791 B CN 105514791B
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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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
- H01S3/094076—Pulsed or modulated pumping
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
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Abstract
Pumping the invention discloses a kind of square wave repeatedly adjusts Q to generate the laser aid and method of adjustable series impulse, is related to laser technology field.The device includes: to adjust Q unit and be coaxially sequentially arranged total reflection mirror, adjusting Q crystal, quarter-wave plate, polarizing film, pump arrangement and outgoing mirror in the laser beam propagation direction of described device.This method: pumping source is started to work, accumulate high level electronics, without pulsed laser output, when high level electron accumulation amount reaches preset value, start to adjusting Q crystal making alive, laser generation is formed in resonant cavity, make the high level electronics of accumulation to low energy order transition and discharges photon, exports first laser pulse；Since first pulsed laser output, a laser pulse is exported every time interval t, laser pulse train is formed, until pumping source stops working.The present invention, which realizes to be pumped with long pulse square wave, repeatedly adjusts Q to generate adjustable series impulse laser, avoids laser output parameters change and the damage of laser optical component.
Description
Technical field
The present invention relates to laser technology fields more particularly to a kind of pumping of square wave, and Q repeatedly to be adjusted to generate swashing for adjustable series impulse
Electro-optical device and method.
Background technique
Laser series impulse comprising certain amount laser pulse has extensively in the fields such as gas ions diagnosis and pulse laser lighting
General application, gas ions diagnosis and both application requirement laser pulse intervals of pulse laser lighting be -300 microsecond of 100 microsecond it
Between it is adjustable, and, laser used at present generates laser string using pumping pulse and the one-to-one method of Q impulse
Pulse, defect existing for this method: if adjusting the pulse number in laser series impulse and pulse spacing, it will make laser
Output parameter variation, result even in laser internal optics component damage.
Summary of the invention
The purpose of the present invention is to provide a kind of square waves to pump laser aid and the side for repeatedly adjusting Q to generate adjustable series impulse
Method, to solve foregoing problems existing in the prior art.
To achieve the goals above, the multiple laser aid for adjusting Q to generate adjustable series impulse of square wave pumping of the present invention,
The laser beam propagation direction of the laser aid is coaxially sequentially arranged total reflection mirror, adjusting Q crystal, quarter-wave plate, polarization
Piece, pump arrangement and outgoing mirror.
Preferably, described device further includes the tune Q circuit connecting with the adjusting Q crystal, and the tune Q circuit is outside resonant cavity
Position close to the adjusting Q crystal is fixed.
Preferably, side plating total reflection film of the total reflection mirror towards the Q-modulating device.
Preferably, the pump arrangement includes pumping source and laser crystal, and the pumping source includes pump cavity and is fixed on
Xenon flash lamp or laser diode in the pump cavity, the laser crystal are fixed on the pump cavity, and the laser is brilliant
The axial direction of body is identical as the laser beam propagation direction.
The laser aid for repeatedly adjusting Q to generate adjustable series impulse, which is pumped, the present invention is based on the square wave realizes that square wave pumping is multiple
Q is adjusted to generate the laser means of adjustable series impulse, which is characterized in that this method comprises:
Total reflection mirror and outgoing mirror form resonant cavity；
Setting adjusts Q circuit to adjusting Q crystal alive time interval t and alive number m；
Pumping source is started to work, accumulation high level electronics in the laser crystal in pump arrangement, no pulsed laser output,
When high level electron accumulation amount reaches preset value, start to adjusting Q crystal making alive, resonant cavity is interior to form laser generation, makes to accumulate
Tired high level electronics is to low energy order transition and discharges photon, exports first laser pulse；
Since first pulsed laser output, a laser pulse is exported after time interval t, forms laser arteries and veins
Punching string, until pumping source stops working.
Preferably, pumping source formed pump pulse duration in, can arbitrarily adjust alive time interval t and
Alive number M, the making alive number m is identical as the laser pulse number in the train of pulse of output, two neighboring laser
Pulse spacing between pulse is identical as one-to-one adjacent time interval t alive twice；
The pumping pulse that the pumping source is formed is the pumping of long pulse square wave.
Preferably, adjust Q circuit to the magnitude of adjusting Q crystal alive making alive time be 10-9s。
Preferably, first laser output of pulse signal, specifically:
S1, pumping source are started to work；
S2, not to adjusting Q crystal making alive, the photon generated in pump arrangement successively pass through polarizing film, quarter-wave plate,
After adjusting Q crystal, it is totally reflected mirror reflection and is successively passing through adjusting Q crystal and quarter-wave plate after backtracking, by polarizing film
Reflect resonant cavity；Without pulsed laser output；
S3, laser crystal constantly accumulates high level electronics until the accumulation of high level electronics reaches preset value, tune Q electricity
Road starts to apply voltage to adjusting Q crystal, makes the spontaneous radiation photon emitted from pump arrangement in 2 π of phase changing capacity
Enter laser crystal afterwards, lures high level electronics into low energy order transition and discharge photon, number of photons sharply increases, by resonant cavity
Feedback, photon in laser crystal it is round-trip several times, shine since pumping source and enter this section of laser crystal to spontaneous radiation photon
The electronics that time transits to energy level can all transit to lower energy level and release corresponding number of photon, form one and swash
Light giant-pulse simultaneously exports；
S4 adjusts Q circuit to stop applying voltage to adjusting Q crystal, repeats S2-S3；Adjacent time interval t phase alive twice
Deng.
Preferably, in the luminous pulse width of pumping source, adjust Q circuit to the alive time interval t of adjusting Q crystal and
Alive number M is adjustable.
Preferably, the voltage for adjusting Q circuit to add to adjusting Q crystal is high pressure.
The beneficial effects of the present invention are:
It is longer in the pumping light pulses duration of pumping source and consistent in the intensity for pumping the pump light in the time, adjust Q
Circuit adds a certain number of high-voltage pulses to adjusting Q crystal at a time interval, realizes one laser pulse train of output；The present invention
The method generates pulse number, arteries and veins by adjusting the number of Q high-voltage pulse and adjusting the time interval between Q high-voltage pulse
Punching is spaced the laser series impulse of equal continuously adjustable, since all tune Q high pressures were included within the duration of pumping pulse,
The fuel factor in laser crystal will not be changed when so being spaced between the pulse number and pulse for changing laser series impulse, in turn
Keep the damage of laser output parameters stablized and avoid laser optical component.
Realizing to be pumped with long pulse square wave through the invention repeatedly adjusts Q to generate adjustable series impulse laser, prevents because changing
Pulse number and pulse spacing in laser series impulse make laser crystal fuel factor change, and lead to laser output parameters
Change and laser optical component damages.By adjusting the number of Q signal and adjusting Q signal in pump pulse duration
Between time interval, realize adjust laser pulse train between laser pulse number and laser pulse included in when
Between be spaced, since all Q impulses appeared within the pumping source LED pulse duration, so the arteries and veins in train of pulse
The variation of laser crystal internal heat effect will not all be made by rushing number and pulse interval variation, to guarantee laser output-index
Stabilization and laser component safety.
Detailed description of the invention
Fig. 1 is the multiple laser device structure schematic diagram for adjusting Q to generate adjustable series impulse of square wave pumping；
Fig. 2 is the multiple timing diagram for adjusting Q to generate adjustable series impulse resonant cavity of square wave pumping.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing, to the present invention into
Row is further described.It should be appreciated that the specific embodiments described herein are only used to explain the present invention, it is not used to
Limit the present invention.
Core of the invention: the pump light longer and within the pumping time in the pumping light pulses duration of pumping source
Intensity is consistent, and Q circuit is adjusted to add a certain number of high-voltage pulses to adjusting Q crystal at a time interval, realizes one laser of output
Train of pulse, the method for the invention are raw by adjusting the number of Q high-voltage pulse and adjusting the time interval between Q high-voltage pulse
At pulse number, the laser series impulse of pulse spacing equal continuously adjustable, since all tune Q high pressures are included in pumping pulse
It will not change in laser crystal within duration, when so being spaced between the pulse number and pulse for changing laser series impulse
Fuel factor, and then keep laser output parameters the damage stablized and avoid laser optical component.
Embodiment:
Referring to Fig.1, the multiple laser aid for adjusting Q to generate adjustable series impulse of square wave pumping, in the laser of the laser aid
Direction of beam propagation is coaxially sequentially arranged total reflection mirror 1, adjusting Q crystal 2, quarter-wave plate 3, polarizing film 4,5 and of pump arrangement
Outgoing mirror 6.
Described device further includes the tune Q circuit 7 connecting with the adjusting Q crystal 2, and the tune Q circuit 7 is close to the laser light
The setting of the beam direction of propagation.Side plating total reflection film of the total reflection mirror 1 towards the Q-modulating device.
The pump arrangement includes pumping source and laser crystal, and the pumping source includes pump cavity and is fixed on the pumping
Xenon flash lamp or laser diode in chamber, the laser crystal are fixed on the pump cavity, the axial direction of the laser crystal
Direction is identical as the laser beam propagation direction.
Component 1 and component 6 constitute the resonant cavity of laser in attached drawing 1, and effect is for the gain in laser crystal
Inside particles energy level transition occurs stimulated radiation and provides feedback, and screens to photonic nature；Component 5 is pump in attached drawing 1
Pu chamber, is made of pumping source and laser crystal, and the gain particle in laser crystal provides necessary level structure to generate laser,
Pumping source occurs energy level transition for gain particle and provides energy；Component 4 in attached drawing is polarizing film, and effect is to resonant cavity
The polarization state of the photon of interior transmission is screened；Component 3 in attached drawing 1 is quarter wave plate, effect be make by photon hair
Raw phase change, phase change amount changes due to the angle in the crystalline axis direction of quarter wave plate and photon polarization state direction, in the present invention
In, it is pi/2 that photon passes through the quarter wave plate phase variable every time；Component 2 in attached drawing 1 is adjusting Q crystal, and component 7 is to adjust Q
The characteristic of circuit, adjusting Q crystal is that, if Q circuit is adjusted to add corresponding voltage to adjusting Q crystal, electrooptic effect can occur for adjusting Q crystal,
Make by photon occur phase change, the knots modification of phase and the characteristic of adjusting Q crystal and Q circuit is adjusted to be added on adjusting Q crystal
Voltage is related, adjusts Q circuit to the phase change pi/2 made after adjusting Q crystal making alive through the photon of adjusting Q crystal in the present invention.
Component 3 in attached drawing 1, i.e. quarter wave plate are an important components in laser, but are not necessary, if will
Quarter wave plate is cancelled, while making that Q circuit is adjusted to give adjusting Q crystal making alive always, is wanting that laser is allowed to remove electricity when exporting laser
Pressure, so that it may in the intracavitary formation laser generation of laser resonator, laser is exported, but if use can exchange Q crystalline substance so for a long time
Body generates bad effect, so not using this mode of operation mostly.
The laser aid for repeatedly adjusting Q to generate adjustable series impulse is pumped based on the square wave realizes that square wave pumping repeatedly adjusts Q to produce
The laser means of raw adjustable series impulse, this method comprises:
Total reflection mirror and outgoing mirror form resonant cavity；
Setting adjusts Q circuit to adjusting Q crystal alive time interval t and alive number M；
Pumping source is started to work, accumulation high level electronics in the laser crystal in pump arrangement, no pulsed laser output,
When high level electron accumulation amount reaches preset value, start to adjusting Q crystal making alive, resonant cavity is interior to form laser generation, makes to accumulate
Tired high level electronics is to low energy order transition and discharges photon, exports first laser pulse；
Since first pulsed laser output, a laser pulse is exported after time interval t, forms laser arteries and veins
Punching string, until pumping source stops working.
More specifically are as follows:
(1) in the pump pulse duration that pumping source is formed, it can arbitrarily adjust alive time interval t and add
The number M of voltage, the making alive number m is identical as the laser pulse number in the train of pulse of output, two neighboring laser arteries and veins
Pulse spacing between punching is identical as one-to-one adjacent time interval t alive twice.
(2) adjust Q circuit to the magnitude of adjusting Q crystal alive making alive time be 10-9s。
In the luminous pulse width of pumping source, adjust Q circuit to the alive time interval t of adjusting Q crystal and making alive
Number M it is adjustable.
The voltage for adjusting Q circuit to add to adjusting Q crystal is high-voltage pulse.
(3) first laser output of pulse signal, specifically:
S1, pumping source are started to work；
S2, not to adjusting Q crystal making alive, the photon generated in pump arrangement successively pass through polarizing film, quarter-wave plate,
After adjusting Q crystal, it is totally reflected mirror reflection and is successively passing through adjusting Q crystal and quarter-wave plate after backtracking, by polarizing film
Reflect resonant cavity；Without pulsed laser output；
S3, laser crystal constantly accumulates high level electronics until the accumulation of high level electronics reaches preset value, tune Q electricity
Road starts to apply voltage to adjusting Q crystal, makes the spontaneous radiation photon emitted from pump arrangement in 2 π of phase changing capacity
Enter laser crystal afterwards, lures high level electronics into low energy order transition and discharge photon, number of photons sharply increases, by resonant cavity
Feedback, photon in laser crystal it is round-trip several times, shine since pumping source and enter this section of laser crystal to spontaneous radiation photon
The electronics that time transits to energy level can all transit to lower energy level and release corresponding number of photon, form one and swash
Light giant-pulse simultaneously exports；
S4 adjusts Q circuit to stop applying voltage to adjusting Q crystal, repeats S2-S3；Adjacent time interval t phase alive twice
Deng.
The time for exporting entire train of pulse is less than a duty cycle of pumping source.
Pump cavity completes the pumping of the long pulsewidth of square wave, and the luminous pulse width of pumping source is ms magnitude, during this period of time,
The number of Q voltage is adjusted by control and adjusts the interval between Q voltage pulse, so that it may adjust laser output laser series impulse
Pulse number and pulse spacing.
The generation process of series impulse laser is as follows:
Pumping source, which shines, to be made the gain inside particles low-lying level electron transition in laser crystal to high level and rests on height
Energy level has part electrons spontaneous radiation during this, transits to low-lying level from high level, while releasing and spontaneous spoke occurs
The identical photon of the electron amount penetrated, for these photons after polarizing film, only polarization state and polarizing film light transmission direction is consistent
Photon can pass through quarter wave plate, phase change pi/2, using no making alive by the photon of polarizing film by polarizing film
Adjusting Q crystal, phase do not change, and the component 1 in attached drawing is the rear mirror of laser, is coated on rear mirror and exports to laser
The incident total reflection film of 0 ° of optical maser wavelength, therefore photon can be reflected after backtracking and again pass by no alive tune Q
Crystal, phase will not equally change, and again pass by quarter wave plate, and phase changes pi/2 again, pass through 1/4 twice in this way
The phase changing capacity of photon is π after wave plate, and corresponding polarization state variable quantity is pi/2, the i.e. polarization state and polarizing film of photon at this time
Light transmission direction be it is vertical, photon will be reflected resonant cavity by polarizing film, cannot also be again introduced into laser crystal, from
While the photon that hair radiation generates is reflected resonant cavity, pumping source is also ceaselessly giving gain inside particles in laser crystal
Energy level transition energy is provided, the electronics of upper energy level is continuously increased, if adjusting Q circuit to adjusting Q when upper energy level electron number is more
Crystal making alive, adjusting Q crystal will play the role of, i.e. photon twice by adjusting Q crystal after phase change identical with quarter wave plate
π, in this way along with the phase change amount for passing through quarter wave plate twice, its phase change when photon is transferred to polarizing film again
Amount is 2 π, and photon polarization state direction is consistent with the light transmission direction of polarizing film, can by polarizing film, spontaneous radiation photon again into
The downward energy level transition of energy level electronics will be lured into and discharge photon by entering laser crystal, and number of photons can be in sharply increasing, and process is humorous
Shake chamber feedback, photon in laser crystal it is round-trip several times, shine since pumping source and enter laser crystal to spontaneous radiation photon
The electronics for transitting to energy level this period can all transit to lower energy level and release corresponding number of photon, form one
The very high laser giant-pulse of a peak power simultaneously passes through, and adjusts Q circuit very short by only 10 to the adjusting Q crystal alive time-9S amount
Grade, that is to say, that adjusting Q circuit to be added on adjusting Q crystal is a voltage pulse, and the laser pulse width of laser output is also
10-9S magnitude.
By using above-mentioned technical proposal disclosed by the invention, following beneficial effect is obtained: having realized through the invention
Repeatedly Q is adjusted to generate adjustable series impulse laser with the pumping of long pulse square wave, prevented because changing the pulse in laser series impulse
The several and pulse spacing makes laser crystal fuel factor change, and leads to laser output parameters change and laser optical member device
Part damage.It, by adjusting the number of Q signal and adjusting the time interval between Q signal, is being realized in pump pulse duration
Time interval of the laser pulse train included between laser pulse number and laser pulse is adjusted, due to all tune
Q pulse appeared within the pumping source LED pulse duration, so pulse number and pulse interval in train of pulse
Variation will not all make the variation of laser crystal internal heat effect, to guarantee the stabilization and laser member device of laser output-index
The safety of part increases the service life of pumping source.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
Depending on protection scope of the present invention.
Claims (6)
1. a kind of multiple laser aid for adjusting Q to generate adjustable series impulse of square wave pumping, which is characterized in that in the laser aid
Laser beam propagation direction is coaxially sequentially arranged total reflection mirror, adjusting Q crystal, quarter-wave plate, polarizing film, pump arrangement and defeated
Appearance；The laser aid further includes the tune Q unit connecting with adjusting Q crystal；
The tune Q unit is to adjust Q circuit, and the position for adjusting Q circuit outside resonant cavity close to the adjusting Q crystal is fixed；
Realize that square wave pumps the laser means for repeatedly adjusting Q to generate adjustable series impulse using above-mentioned apparatus, this method comprises:
Total reflection mirror and outgoing mirror form resonant cavity；
Setting adjusts Q circuit to adjusting Q crystal alive time interval t and alive number m；
Pumping source is started to work, and high level electronics, no pulsed laser output, in height are accumulated in the laser crystal in pump arrangement
When energy level electron accumulation amount reaches preset value, start to adjusting Q crystal making alive, resonant cavity is interior to form laser generation, makes accumulation
High level electronics is to low energy order transition and discharges photon, exports first laser pulse；
Since first pulsed laser output, a laser pulse is exported every time interval t, forms laser pulse train, directly
Until pumping source stops working；
In the pump pulse duration that pumping source is formed, alive time interval t and alive time can be arbitrarily adjusted
Number M, the making alive number m is identical as the laser pulse number in the train of pulse of output, between two neighboring laser pulse
Pulse spacing is identical as one-to-one adjacent time interval t alive twice；The pumping pulse that the pumping source is formed is
The pumping of long pulse square wave；
First laser output of pulse signal, specifically:
S1, pumping source are started to work；
S2, not to adjusting Q crystal making alive, the photon generated in pump arrangement successively passes through polarizing film, quarter-wave plate, adjusts Q
After crystal, it is totally reflected mirror reflection and successively passes through adjusting Q crystal and quarter-wave plate again after backtracking, it is anti-by polarizing film
Project resonant cavity；Without pulsed laser output；
S3, laser crystal constantly accumulates high level electronics until the accumulation of high level electronics reaches preset value, and tune Q circuit starts
Apply voltage to adjusting Q crystal, makes to enter after 2 π of phase changing capacity from the spontaneous radiation photon emitted in pump arrangement
Laser crystal lures high level electronics into low energy order transition and discharges photon, and number of photons sharply increases, and feeds back by resonant cavity,
Photon in laser crystal it is round-trip several times, shine since pumping source and enter jump laser crystal this period to spontaneous radiation photon
The electronics for adjourning energy level can all transit to lower energy level and release corresponding number of photon, form the huge arteries and veins of laser
It rushes and exports；
S4 adjusts Q circuit to stop applying voltage to adjusting Q crystal, repeats S2-S3；Adjacent time interval t alive twice is equal.
2. laser aid according to claim 1, which is characterized in that the total reflection mirror is towards the adjusting Q crystal device
Side plating total reflection film.
3. laser aid according to claim 1, which is characterized in that the pump arrangement includes pumping source and laser crystal,
The pumping source includes pump cavity and the xenon flash lamp or laser diode that are fixed in the pump cavity, and the laser crystal is solid
It is scheduled on the pump cavity, the axial direction of the laser crystal is identical as the laser beam propagation direction.
4. laser aid according to claim 1, which is characterized in that adjust Q circuit to the adjusting Q crystal alive making alive time
Magnitude be 10-9s。
5. laser aid according to claim 1, which is characterized in that in the luminous pulse width of pumping source, adjust Q circuit
It is adjustable to adjusting Q crystal alive time interval t and alive number M.
6. laser aid according to claim 1, which is characterized in that the voltage for adjusting Q circuit to add to adjusting Q crystal is high pressure.
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| CN111029893B (en) * | 2019-05-09 | 2021-01-15 | 长春理工大学 | Dual-wavelength alternate Q-switching single longitudinal mode output group pulse laser and laser output method |
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| CN110247288B (en) * | 2019-07-05 | 2024-02-13 | 电子科技大学 | Normal temperature semiconductor pulse and application thereof |
| CN111505474B (en) * | 2020-04-24 | 2021-11-02 | 中国科学院长春光学精密机械与物理研究所 | CO2Laser amplifier upper energy level service life testing device and method |
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