CN103151698B - Time-domain doublet pulse pumping method for restraining parasitic oscillation of Ti sapphire multipass amplifier - Google Patents
Time-domain doublet pulse pumping method for restraining parasitic oscillation of Ti sapphire multipass amplifier Download PDFInfo
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Abstract
Disclosed is a time-domain doublet pulse pumping method for restraining parasitic oscillation of a Ti sapphire multipass amplifier. The properties of time-domain doublet pumping pulse are utilized, time delay of seed light is adjusted and single-pass time interval of the multipass amplifier is adjusted to amplify 800-nanometer seed light to enable crosswise transmission gain of a Ti sapphire crystal to be kept in a low level in the process of amplifying, the parasitic oscillation of the Ti sapphire is effectively restrained, and amplifying efficiency of the seed light is improved. The time-domain doublet pulse pumping method for restraining the parasitic oscillation of the Ti sapphire multipass amplifier has the advantages of being convenient to adjust, simple, high-efficient and strong in practicality.
Description
Technical field
The present invention relates to laser amplification technique, particularly a kind of time domain splitblip pumping suppresses the method for Ti∶Sapphire laser multi-pass amplifier parasitic oscillation.
Background technology
The invention of chirped pulse amplification (CPA) technology is that ultrashort and ultrahigh laser opens new road; After 1990s, CPA technology obtains and develops rapidly, and up to now, a lot of country establishes bat watt (PW) magnitude laser aid based on titanium gem crystal (Ti:Sapphire) in the world; Based in the PW laser aid of Ti∶Sapphire laser, export to obtain high-octane amplification, the lateral dimension of Ti∶Sapphire laser is much larger than longitudinal size, and therefore, under high energy pumping, the horizontal gain of Ti∶Sapphire laser is much larger than longitudinal gain.When not having seed light to inject, the periphery of Ti∶Sapphire laser is a resonant cavity, when horizontal gain reaches certain threshold value, strong horizontal parasitic oscillation will occur, consume a large amount of inverted population, and then affect the amplification of seed light.Therefore reach tens joules even the PW laser of up to a hundred joules for output energy, need heavy caliber Ti∶Sapphire laser as terminal amplifier and superlaser as pumping source, horizontal parasitic oscillation then governs further developing of high energy CPA technology; Horizontal parasitic oscillation not only reduces the conversion efficiency of Ti∶Sapphire laser, and deteriorated optical quality and amplifying laser contrast ration, and these all create adverse influence to Physical Experiment.Therefore, how to suppress the parasitic oscillation of heavy caliber Ti∶Sapphire laser amplifier to be the key studying high performance bat watt laser always.
At present, the main method of suppression parasitic oscillation is
(1) adopt refractive index to carry out bound edge to reduce Ti∶Sapphire laser periphery Fresnel reflectivity close to the matching fluid of Ti∶Sapphire laser refractive index (n=1.76), thus improve the threshold value of horizontal parasitic oscillation.Meanwhile, the absorber (as: carbon dust) that adulterates in matching fluid absorbs the spontaneous radiation fluorescence appeared from the side, thus overcomes parasitic oscillation effect.The method inhibits the parasitic oscillation of Ti∶Sapphire laser better.But in high-energy pumping, in heavy caliber titanium precious stone laser amplification system, horizontal gain can be very high, to such an extent as to exceed described parasitic oscillation threshold value.Refractive index now due to matching fluid is limited, and with wavelength change, therefore, the method is also restricted.
(2) adopt the mode of both-end pumping Ti∶Sapphire laser, reduce Ti∶Sapphire laser pumping density, make the energy storage in Ti∶Sapphire laser more even, thus reduce the horizontal gain of Ti∶Sapphire laser.This method can not active suppression parasitic oscillation, and rejection ability is very limited.
Inverted population in titanium gem crystal is the integration to pumping pulse time domain, and along with the time increases, upper energy level population increases.The time domain distribution of currently used pump light is all unimodal distribution of pulses, therefore the inverted population in titanium gem crystal is very high to the sensitiveness of time, in the time interval between the every journey of multi-pass amplifier, inverted population in Ti∶Sapphire laser increases along with the absorption of pump energy always, and horizontal gain is easy to the threshold value reaching parasitic oscillation.
Summary of the invention
The object of the invention is the limitation overcoming the parasitic oscillation of above-mentioned existing suppression Ti∶Sapphire laser, a kind of time domain splitblip pumping is provided to suppress the method for Ti∶Sapphire laser multi-pass amplifier parasitic oscillation, the method both effectively can suppress parasitic oscillation, the amplification efficiency of seed light can be improved again, the method is simple to operate, scientific and effective not only, and practical.
Technical solution of the present invention is as follows:
A kind of time domain splitblip pumping suppresses the method for Ti∶Sapphire laser multi-pass amplifier parasitic oscillation, described Ti∶Sapphire laser multi-pass amplifier comprises: 527nm pump laser, titanium gem crystal, multi-pass amplifier, synchronizing relay trigger and 800nm laser seed source, its feature is that the method comprises the following steps:
1. the 527nm pumping pulse that the 527nm pump laser described in described synchronizing relay trigger triggers produces a time domain bimodal distribution is injected and the titanium gem crystal of pumping multi-pass amplifier;
2. described synchronizing relay trigger after time delay Δ t, the 800nm seed optical pulse that the 800nm laser seed source described in triggering produces the titanium gem crystal of multi-pass amplifier described in injecting;
3. using the forward position moment of the bimodal pumping pulse of 527nm as time zero, the time delay Δ t of the synchronizing relay trigger described in adjustment, rear along the moment tp1 moment near the lowest point of the leading peak making the peak value moment ts1 of described 800nm seed optical pulse be positioned at the bimodal pumping pulse of described 527nm;
4. the time interval δ t of single-pass in described multi-pass amplifier is adjusted, make second of 800nm seed optical pulse promote blood circulation punching peak value moment ts2 between the lowest point tp2 and second the summit tp3 moment of the bimodal pumping pulse of 527nm, and, make the peak value moment tsn >=tp4 of last punching of promoting blood circulation of 800nm seed optical pulse, wherein tp4 is the cut-off time of the bimodal pumping pulse of single 527nm.
The generation device of the bimodal pumping pulse of described 527nm comprises following three kinds:
1. the laser pulse that described 527nm laser exports is divided into transmitted light beam and folded light beam through beam splitter, transmitted light beam described in change and the light path of folded light beam, two light beams are joined end to end in time domain, thus forms the bimodal pumping pulse of 527nm of time domain bimodal distribution;
Or 2. described synchronizing relay trigger triggers a 527nm pump laser and the 2nd 527nm pump laser, the 527nm pumping pulse that one 527nm pump laser and the 2nd 527nm pump laser are produced joins end to end in time domain, forms the bimodal pumping pulse of 527nm of time domain bimodal distribution;
Or 3. described synchronizing relay trigger triggers a 1053nm laser and produces a unimodal 1053nm laser pulse, this 1053nm laser pulse produces the bimodal laser pulse of the bimodal 1053nm of time domain after Pockers cell shaping, and the bimodal laser pulse of this 1053nm produces the bimodal pumping pulse of 527nm of time domain bimodal distribution again after 1053nm laser amplifier amplifies after frequency-doubling crystal frequency multiplication.
The pulse duration of the bimodal pumping pulse of described 527nm and energy preferably meet following requirement:
1. the pulsewidth of the postpeak of the bimodal pumping pulse of 527nm is more than or equal to the pulsewidth of leading peak;
2. the energy that the bimodal pumping pulse postpeak of 527nm comprises is less than or equal to the energy that leading peak comprises.
Principle of the present invention is:
Extract the inverted population in Ti∶Sapphire laser when seed light is exaggerated, the suppression of amplification to parasitic oscillation of seed light has important function, and seed light energy is stronger, suppresses the ability of parasitic oscillation stronger.When we select at the moment seed injection light along the lowest point after leading peak, the moment that second logical seed optical pulse is injected adjusted according to two peak-to-peak time intervals, and the second logical seed optical pulse must be injected before horizontal gain does not reach parasitic oscillation threshold value.Lead in the time interval of seed optical pulse in the first logical seed optical pulse and second, because pump energy is smaller, inverted population in Ti∶Sapphire laser increases relatively slow in this time interval, therefore before the second logical seed light is injected, the horizontal gain of Ti∶Sapphire laser is smaller, parasitic oscillation can not be there is, avoid the limitation of existing unimodal pumping pulse, and the second logical seed light amplification that have passed through the first logical Ti∶Sapphire laser amplifier of injecting, energy is stronger, and therefore the suppression of injection to horizontal gain of the second logical seed light is more obvious! Now, pump energy has started to die down, and therefore in ensuing several logical seed light amplification process, the horizontal gain of Ti∶Sapphire laser can not exceed the threshold value of parasitic oscillation.The present invention can ensure that pump light is absorbed completely, effectively can suppress again the generation of parasitic oscillation.
Because titanium gem crystal is to the absorption of pump light, when reaching certain time point, the horizontal gain of Ti∶Sapphire laser can rapid gain, the postpeak pulsewidth of the splitblip therefore adopted is more than or equal to leading peak pulsewidth and energy is less than or equal to leading peak pulsewidth, is all the sensitiveness in order to reduce the horizontal gain versus time of Ti∶Sapphire laser.
Compared with first technology, the present invention has following outstanding feature:
1. utilize the bimodal pumping pulse of 527nm, effectively can suppress the parasitic oscillation of Ti∶Sapphire laser, very effectively simple;
2. utilize the characteristic of time domain splitblip, decrease and export energy to the sensitiveness of time delay;
3. utilize the characteristic of time domain splitblip, the time delay of adjustment seed light and pump light, adjust the time interval between each pulse of multi-pass amplifier simultaneously, effectively can suppress the parasitic oscillation of Ti∶Sapphire laser, thus the amplification efficiency of final seed light can be improved.
Accompanying drawing explanation
Fig. 1 is the index path that time domain splitblip pumping of the present invention suppresses the method for Ti∶Sapphire laser multi-pass amplifier parasitic oscillation.
Fig. 2 is the sketch utilizing time domain bimodal 527nm pumping pulse pumping titanium gem crystal and 800nm seed light to amplify.
Fig. 3 is the simple and easy index path of the 527nm bimodal pumping pulse pumping Ti∶Sapphire laser of the time domain bimodal distribution utilizing 527nm beam splitter to produce.
Fig. 4 is the simple and easy index path utilizing synchronizing relay trigger to control the 527nm bimodal pumping pulse pumping Ti∶Sapphire laser of the delay acquisition time domain bimodal distribution between two-way 527nm pump laser.
Fig. 5 is the simple and easy index path of the bimodal pumping pulse of 527nm of the time domain bimodal distribution utilizing time domain shaping device to produce.
Embodiment
Please first consult Fig. 1, Fig. 1 is the index path that time domain splitblip pumping of the present invention suppresses the method for Ti∶Sapphire laser multi-pass amplifier parasitic oscillation, the present invention is a kind of method that time domain splitblip pumping suppresses the parasitic oscillation of Ti∶Sapphire laser multi-pass amplifier, described Ti∶Sapphire laser multi-pass amplifier comprises: 527nm pump laser 1, titanium gem crystal 2, multi-pass amplifier 3, synchronizing relay trigger 4 and 800nm laser seed source 5, the method comprises the following steps:
1. described synchronizing relay trigger 4 triggers the 527nm pumping pulse that described 527nm pump laser 1 produces a time domain bimodal distribution and injects and the titanium gem crystal 2 of pumping multi-pass amplifier 3;
2. described synchronizing relay trigger 4 after time delay Δ t, the 800nm seed optical pulse that the 800nm laser seed source 5 described in triggering produces the titanium gem crystal 2 of multi-pass amplifier 3 described in injecting;
3. refer to Fig. 2, Fig. 2 is the sketch utilizing time domain bimodal 527nm pumping pulse pumping titanium gem crystal and 800nm seed light to amplify; Using the forward position moment of the bimodal pumping pulse of 527nm as time zero, the time delay Δ t of the synchronizing relay trigger 4 described in adjustment, rear along the moment tp1 moment near the lowest point of the leading peak making the peak value moment ts1 of described 800nm seed optical pulse be positioned at the bimodal pumping pulse of described 527nm;
4. the time interval δ t of single-pass in described multi-pass amplifier 3 is adjusted, make second of 800nm seed optical pulse promote blood circulation punching peak value moment ts2 between the lowest point tp2 and second the summit tp3 moment of the bimodal pumping pulse of 527nm, and, make the peak value moment tsn >=tp4 of last punching of promoting blood circulation of 800nm seed optical pulse, wherein tp4 is the cut-off time of the bimodal pumping pulse of single 527nm.
The generation device of the bimodal pumping pulse of described 527nm comprises following three kinds:
1. refer to Fig. 3, Fig. 3 is the simple and easy index path of the 527nm bimodal pumping pulse pumping Ti∶Sapphire laser of the time domain bimodal distribution utilizing 527nm beam splitter to produce; The laser pulse that described 527nm laser exports is divided into transmitted light beam and folded light beam through beam splitter 6, transmitted light beam described in change and the light path of folded light beam, two light beams are joined end to end in time domain, thus forms the bimodal pumping pulse of 527nm of time domain bimodal distribution;
Or 2. referring to Fig. 4, Fig. 4 is the simple and easy index path utilizing synchronizing relay trigger to control the 527nm bimodal pumping pulse pumping Ti∶Sapphire laser of the delay acquisition time domain bimodal distribution between two-way 527nm pump laser; Described synchronizing relay trigger 4 triggers a 527nm pump laser 8 and the 2nd 527nm pump laser 9, the 527nm pumping pulse that one 527nm pump laser 8 and the 2nd 527nm pump laser 9 are produced joins end to end in time domain, forms the bimodal pumping pulse of 527nm of time domain bimodal distribution;
Or 3. referring to Fig. 5, Fig. 5 is the simple and easy index path of the bimodal pumping pulse of 527nm of the time domain bimodal distribution utilizing time domain shaping device to produce; Described synchronizing relay trigger 4 triggers a 1053nm laser 10 and produces a unimodal 1053nm laser pulse, this 1053nm laser pulse produces the bimodal laser pulse of the bimodal 1053nm of time domain after Pockers cell 11 shaping, and the bimodal laser pulse of this 1053nm produces the bimodal pumping pulse of 527nm of time domain bimodal distribution again after 1053nm laser amplifier 12 amplifies after frequency-doubling crystal 13 frequency multiplication.
The pulse duration of the bimodal pumping pulse of described 527nm and energy preferably meet following requirement:
1. the pulsewidth of the postpeak of the bimodal pumping pulse of 527nm is more than or equal to the pulsewidth of leading peak;
2. the energy that the bimodal pumping pulse postpeak of 527nm comprises is less than or equal to the energy that leading peak comprises.
Adopt the pump light of more wide pulse width, stronger seed light energy injection more effectively can suppress parasitic oscillation; Time delay depends on the energy size of seed injection light to a certain extent to the rejection ability of parasitic oscillation.In addition, adopt the pumping pulse of time domain multimodal distribution, the parasitic oscillation of Ti∶Sapphire laser can be suppressed by adjustment time delay equally.
Claims (3)
1. the method for time domain splitblip pumping suppression Ti∶Sapphire laser multi-pass amplifier parasitic oscillation, described Ti∶Sapphire laser multi-pass amplifier comprises: 527nm pump laser (1), titanium gem crystal (2), multi-pass amplifier (3), synchronizing relay trigger (4) and 800nm laser seed source (5), is characterized in that the method comprises the following steps:
1. the 527nm pumping pulse that the 527nm pump laser (1) described in described synchronizing relay trigger (4) triggers produces a time domain bimodal distribution is injected and the titanium gem crystal (2) of pumping multi-pass amplifier (3);
2. described synchronizing relay trigger (4) is after time delay Δ t, and the 800nm laser seed source (5) described in triggering produces the titanium gem crystal (2) of the multi-pass amplifier (3) of 800nm seed optical pulse also described in injection;
3. using the forward position moment of the bimodal pumping pulse of 527nm as time zero, the time delay Δ t of the synchronizing relay trigger (4) described in adjustment, rear along the moment tp1 moment near the lowest point of the leading peak making the peak value moment ts1 of described 800nm seed optical pulse be positioned at the bimodal pumping pulse of described 527nm;
4. the time interval δ t of single-pass in described multi-pass amplifier (3) is adjusted, make second of 800nm seed optical pulse promote blood circulation punching peak value moment ts2 between the lowest point tp2 and second the summit tp3 moment of the bimodal pumping pulse of 527nm, and, make the peak value moment tsn >=tp4 of last punching of promoting blood circulation of 800nm seed optical pulse, wherein tp4 is the cut-off time of the bimodal pumping pulse of single 527nm.
2. method according to claim 1, is characterized in that the production method of the bimodal pumping pulse of described 527nm comprises following three kinds:
1. the laser pulse that described 527nm laser exports is divided into transmitted light beam and folded light beam through beam splitter (6), transmitted light beam described in change and the light path of folded light beam, two light beams are joined end to end in time domain, thus forms the bimodal pumping pulse of 527nm of time domain bimodal distribution;
Or 2. described synchronizing relay trigger (4) triggers a 527nm pump laser (8) and the 2nd 527nm pump laser (9), the 527nm pumping pulse that one 527nm pump laser (8) and the 2nd 527nm pump laser (9) are produced joins end to end in time domain, forms the bimodal pumping pulse of 527nm of time domain bimodal distribution;
Or 3. described synchronizing relay trigger (4) triggers a 1053nm laser (10) and produces a unimodal 1053nm laser pulse, this 1053nm laser pulse produces the bimodal laser pulse of the bimodal 1053nm of time domain after Pockers cell (11) shaping, and the bimodal laser pulse of this 1053nm produces the bimodal pumping pulse of 527nm of time domain bimodal distribution again after 1053nm laser amplifier (12) amplifies after frequency-doubling crystal (13) frequency multiplication.
3. method according to claim 1 and 2, is characterized in that the pulse duration of the bimodal pumping pulse of described 527nm and energy meet following requirement:
1. the pulsewidth of the postpeak of the bimodal pumping pulse of 527nm is more than or equal to the pulsewidth of leading peak;
2. the energy that the bimodal pumping pulse postpeak of 527nm comprises is less than or equal to the energy that leading peak comprises.
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| CN104253373B (en) * | 2014-09-18 | 2017-03-15 | 中国科学院上海光学精密机械研究所 | Titanium precious stone laser amplifier |
| CN105552703A (en) * | 2016-02-21 | 2016-05-04 | 中国科学院光电研究院 | Method and device for adjusting output energy of laser amplifier |
| CN116169862B (en) * | 2023-04-20 | 2023-07-18 | 杭州得明电子有限公司 | Inductance current intermittent mode frequency peak value control method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5084888A (en) * | 1989-12-29 | 1992-01-28 | Hoya Corporation | Laser medium for use in a composite slab type laser |
| CN101034784A (en) * | 2007-04-20 | 2007-09-12 | 中国科学院上海光学精密机械研究所 | Device and method for restraining the titanium precious stone laser amplifier parasitical surge |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5084888A (en) * | 1989-12-29 | 1992-01-28 | Hoya Corporation | Laser medium for use in a composite slab type laser |
| CN101034784A (en) * | 2007-04-20 | 2007-09-12 | 中国科学院上海光学精密机械研究所 | Device and method for restraining the titanium precious stone laser amplifier parasitical surge |
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