CN202817481U - High-peak power picosecond laser with flexibly adjustable output pulse number - Google Patents
High-peak power picosecond laser with flexibly adjustable output pulse number Download PDFInfo
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- CN202817481U CN202817481U CN201220448971.9U CN201220448971U CN202817481U CN 202817481 U CN202817481 U CN 202817481U CN 201220448971 U CN201220448971 U CN 201220448971U CN 202817481 U CN202817481 U CN 202817481U
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Abstract
The utility model relates to a high-peak power picosecond laser with flexibly adjustable output pulse number. A semiconductor diode is connected with a first lens and a second lens in sequence. The second lens is connected with a first plane mirror, and the first plane mirror is connected with a laser crystal. The laser crystal is connected with a second plane mirror. A picoseconds optical fiber seed source is connected with a fourth lens. The fourth lens is connected with an acousto-optical pulse menu selection device. The acousto-optical pulse menu selection device is connected with a third lens. The third lens is connected with a film polaroid. The film polaroid is connected with a third plane mirror. The third plane mirror is connected with a Faraday rotator. The Faraday rotator is connected with the first plane mirror. After seed light passes through the film polaroid, the seed light passes through the Faraday rotator and polarization state is rotated by 45 DEG. After first amplification, the seed light is reflected into the laser crystal for second amplification, and polarization state is rotated by another 45 DEG when the seed light passes through the Faraday rotator. Laser polarization state is rotated by 90 DEG relative to the polarization state before the light is amplified. The seed light is transmitted and output through the polaroid, and laser two-way amplification is realized.
Description
Technical field
But the utility model relates to a kind of high-peak power picosecond laser of exporting the umber of pulse flexible, belongs to high-peak power picosecond laser technical field.
Background technology
The high-energy picosecond laser is widely used in fields such as the meticulous little processing of material, LED scribing, photovoltaic, scientific researches with its high peak power, narrow pulse duration.With respect to nanosecond laser, adopt the picosecond laser rapidoprint, have that precision height, heat-affected zone are minimum, the processing edge is without advantages such as burrs.In order to satisfy above-mentioned application, General Requirements picosecond laser peak power reaches the MW magnitude, the principle that produces at present MW magnitude peak power picosecond laser is from the method for tens MHz locked mode seed source laser by electric light or acoustooptic modulation, select kHz to hundred kHz seed optical pulse, then realize watt level power stage through amplifying.
Pulse menu technology is by two kinds of electric light menu technology and acousto-optic menu technology, and electric light menu technology fast response time (less than 5ns) can be realized the pulse menu function that 100MHz is above, but its volume is very large, price needs several kilovolts of high-voltage signals simultaneously, and it is very inconvenient to use.The acousto-optic menu technology response time is slow (generally greater than 10ns), usually can only be used for the following pulse menu function of 50MHz, but its volume is small and exquisite, and is cheap, very easy to use.Acousto-optic menu device operation principle is as follows: behind the seed photo-signal process acousto-optic menu device of high frequency, utilize the acoustooptic modulation principle, when the significant level signal loading was to the menu device, the flashlight that needs was with out diffracted, the time length of significant level determine to choose number of pulses how much.For example for the seed laser of 30MHz, its cycle is 33.3ns, so if the menu device significant level time less than 33.3ns, can be selected individual pulse, the increase time can be chosen more multiple-pulse.
The mode that laser pulse amplifies has two kinds, i.e. regenerative amplification and row ripple amplify.The regenerative amplification technological merit is that amplifier gain is high, can reach 10
6-10
9But the regenerative amplification cavity configuration is complicated, and the paired pulses sequential requires very strict, needs simultaneously to add the electro-optical cavity dumping function, and manufacture difficulty is very large.The advantage of row ripple amplifying technique is, do not need the regenerative amplification chamber, and is simple in structure, reliable and stable, and obtains easily higher-wattage output, and shortcoming is that the single-stage gain amplifier is little, generally can reach 10
3-10
4
At present, most of companies all adopt regenerative amplifier to amplify picopulse in the world, companies such as High Q laser, Ekspla, Trumpf, Coherent, and maximum power output can reach under the hundred kHz frequencies more than the 50W.External also have research to be used for the travelling-wave amplifier that picopulse amplifies.For example, the people such as Italian Antonio Agnesi in 2006 adopt the two-stage slab laser to realize the 0.1nJ single pulse energy is amplified to 10uJ, and gain amplifier is 10
5The travelling-wave amplifier that the people such as 2009 Japanese K. Nawata adopt 2mW psec seed source laser to consist of by wedge shape lath Nd:YVO4 for twice is realized power output 25W, and gain amplifier is 12500.In order to obtain high gain and high peak power, the gain media of travelling-wave amplifier is generally battened construction, and the shaping meeting causes the laser facula degradation but battened construction need to carry out repeatedly to amplifying laser.Adopt the end pumping Nd:YVO4 mode can head it off, but because the impact of Nd:YVO4 end face thermal stress can not be born high pump power (less than 40W), gain amplifier be very little.
Summary of the invention
The purpose of this utility model is to overcome the deficiency that prior art exists, but a kind of high-peak power picosecond laser of exporting the umber of pulse flexible is provided.The peak power of laser can be amplified to the MW magnitude by several kW, by changing the acousto-optic menu device significant level time, realize that number of pulses changes flexibly from 1 to hundreds of is individual in the individual pulse envelope, reach the purpose that laser peak power is adjusted flexibly.
The purpose of this utility model is achieved through the following technical solutions:
But a kind of high-peak power picosecond laser of exporting the umber of pulse flexible, characteristics are: comprise semiconductor diode, laser crystal, Faraday polarization apparatus and psec optical fiber seed source, semiconductor diode is connected first lens and the second lens successively, the second lens are connected the first level crossing, the first level crossing is connected laser crystal, laser crystal is connected the second level crossing, described psec optical fiber seed source is connected the 4th lens, the 4th lens are connected acousto-optic pulse menu device, acousto-optic pulse menu device is connected the 3rd lens, the 3rd lens are connected the film polarizer, the film polarizer is connected the 3rd level crossing, the 3rd level crossing is connected Faraday polarization apparatus, and Faraday polarization apparatus is connected mutually with the first level crossing;
The light that semiconductor diode sends advances in the laser crystal through first lens and the second Lens Coupling, the horizontal polarization psec seed source pulse of psec optical fiber seed source, through the 4th lens focus behind acousto-optic pulse menu device, select the picopulse seed laser of kHz, seed laser collimates after through the 3rd lens, rotate 45 ° by the Faraday polarization apparatus polarization state behind seed laser process film polarizer behind the collimation and the 3rd level crossing, seed light realizes for the first time light amplification through laser crystal again, laser after the amplification through the first flat mirror reflects after, again do for the second time through laser crystal and amplify, laser after secondary amplifies returns along original optical path through the second level crossing, again again rotate 45 ° through Faraday polarization apparatus rear polarizer attitude, with respect to laser polarization state half-twist before amplifying, transmission is gone out after laser is again through the film polarizer, realizes whole light amplification process.
Further, but above-mentioned a kind of high-peak power picosecond laser of exporting the umber of pulse flexible, semiconductor diode is that power output is the 888.5nm wave band semiconductor diode of 150W, its tail optical fiber core diameter is 400 microns, numerical aperture NA=0.22.
Further, but above-mentioned a kind of high-peak power picosecond laser of exporting the umber of pulse flexible, laser crystal is Nd:YVO4, and crystal has the angle of wedge, and crystal doping concentration is 0.5%～1%, and crystal length is positioned at 25～50mm.
Further, but above-mentioned a kind of high-peak power picosecond laser of exporting the umber of pulse flexible is characterized in that: described psec optical fiber seed source (13) is that the seed source frequency is 10MHz～80MHz fiber laser.
The substantive distinguishing features that technical solutions of the utility model are outstanding and significant progressive being mainly reflected in:
The utility model adopts acousto-optic menu technology, elect high frequency seed source laser as the low frequency seed laser, realize the output of high-peak power picosecond laser through high-gain amplifier again, by changing the significant level time of acousto-optic menu device, control flexibly the output number of pulses of individual pulse envelope, finish by the combination of polarization apparatus and film polarizer seed optical pulse is carried out the round trip amplification.Has the flexibly advantage such as controlled, simple in structure, good stability of peak power height, number of pulses.
Description of drawings
Below in conjunction with accompanying drawing technical solutions of the utility model are described further:
Fig. 1: the utility model laser theory structure schematic diagram.
Embodiment
Adopt the 888.5nm pump light to replace the 808nm pump light can effectively reduce crystal thermal effect more than 40%, so crystal end-face can bear higher pump power (greater than 150W).The utility model adopts the round trip travelling-wave amplifier based on 888.5nm diode end-face pump Nd:YVO4 mode, cooperate acousto-optic menu technology, realize 1000 times of gain amplifiers, peak power reaches the 5MW laser pulse, by changing the acousto-optic menu device significant level time, can realize that number of pulses changes flexibly from 1 to hundreds of is individual in the individual pulse envelope, thereby realize the flexible adjustment of laser peak power, significant for laser processing technology research.
As shown in Figure 1, but a kind of high-peak power picosecond laser of exporting the umber of pulse flexible, comprise semiconductor diode 1, laser crystal 5, Faraday polarization apparatus 7 and psec optical fiber seed source 13, semiconductor diode 1 is that power output is the 888.5nm wave band semiconductor diode of 150W, its tail optical fiber core diameter is 400 microns, numerical aperture NA=0.22; Laser crystal 5 is Nd:YVO4, and crystal has the angle of wedge, and crystal doping concentration is 0.5%～1%, and crystal length is positioned at 25～50mm; Psec optical fiber seed source 13 is seed source frequency 10MHz～80MHz, 30MHz psec fiber laser; Semiconductor diode 1 is connected first lens 2 and the second lens 3 successively, the second lens 3 are connected the first level crossing 4, the first level crossing 4 is connected laser crystal 5, laser crystal 5 is connected the second level crossing 6, described psec optical fiber seed source 13 is connected the 4th lens 12, the 4th lens 12 are connected acousto-optic pulse menu device 11, acousto-optic pulse menu device 11 is connected the 3rd lens 10, the 3rd lens 10 are connected film polarizer 9, film polarizer 9 is connected the 3rd level crossing 8, the 3rd level crossing 8 is connected Faraday polarization apparatus 7, and Faraday polarization apparatus 7 is connected mutually with the first level crossing 4;
The light that semiconductor diode 1 sends is coupled in the laser crystal 5 through first lens 2 and the second lens 3, the horizontal polarization psec seed source pulse of psec optical fiber seed source 13, after focusing on acousto-optic pulse menu device 11 through the 4th lens 12, select the picopulse seed laser of kHz, seed laser collimates after through the 3rd lens 10, rotate 45 ° by Faraday polarization apparatus 7 polarization states behind seed laser process film polarizer 9 behind the collimation and the 3rd level crossing 8, seed light realizes for the first time light amplification through laser crystal 5 again, after laser after the amplification reflects through the first level crossing 4, again do for the second time through laser crystal 5 and amplify, laser after secondary amplifies returns along original optical path through the second level crossing 6, again again rotate 45 ° through Faraday polarization apparatus 7 rear polarizer attitudes, with respect to laser polarization state half-twist before amplifying, transmission is gone out after laser is again through film polarizer 9, realizes whole light amplification process.
Adopt 888.5nm diode end-face pump Nd:YVO4 mode to realize the amplification of seed optical pulse.Adopt 888.5nm optical pumping Nd:YVO4 crystal, laser crystal particle directly is energized into upper laser level from ground state, effectively reduced the quantum loss, so that can bear the pump power greater than 150W, under high power pump, amplifier has very high gain.
By adopting Faraday polarization apparatus 7 to cooperate film polarizer 9 to realize the round trip amplification of laser, behind the seed light process film polarizer 9, through Faraday polarization apparatus 7,45 ° of polarization state rotations, after amplifying for the first time, seed light is reflected back toward laser crystal inside and does the secondary amplification, polarization state is rotated 45 ° again during again through Faraday polarization apparatus 7, with respect to laser polarization state half-twist before amplifying, thus can transmission export through polarizer, thus realization laser round trip is amplified.
The psec seed optical pulse is inner to acousto-optic menu device through lens focus, the seed light of MHz is elected as the seed light of kHz, seed light is passed through after the collimated through behind film polarizer 9 and the Faraday polarization apparatus 7 again, 45 ° of polarization state rotations, the process speculum is finished for the first time amplification after inciding laser crystal 5, laser pulse after the amplification turns back in the laser crystal 5 through flat mirror reflects, finishes the second time of seed light and amplifies.Laser pulse after amplifying for the second time sees through Faraday polarization apparatus 7 along former input path, polarization state through amplifying laser behind the Faraday polarization apparatus 7 is rotated 45 ° again, the polarization state of this moment is vertical with the polarization state that incides for the first time the film polarizer, and the laser of finishing the round trip amplification can transmit from the film polarizer.
Adopt by the control acousto-optic menu device significant level time, control flexibly the output number of pulses of individual pulse envelope, pulse envelope quantity can change flexibly from 1 to a hundreds of pulse.
Laser crystal is Nd:YVO4, and crystalline size is 3 * 3 * 30mm
3, crystal has 1.5 ° of angles of wedge, prevents crystal self-oscillation under the high power pump, and logical recirculated water accurately cools off temperature control to crystal.
For improving the extraction efficiency of amplifier, the polarization state during seed source laser process laser crystal is 45 ° of polarizations, and the placement of laser crystal must be satisfied its polarization in 45 ° of directions.
Pulse menu technology is acousto-optic pulse menu technology, by the control acousto-optic menu device significant level time, controls flexibly the output number of pulses of individual pulse envelope, and pulse envelope quantity changes flexibly from 1 to a hundreds of pulse.
Embodiment
According to technique scheme, but make up the high-peak power picosecond laser experimental provision of exporting the umber of pulse flexible.When pumping luminous power 150w, when pulse recurrence rate was 100kHz, amplifier output power was 4W, records beam quality factor M with the beam quality analyzer
2X and Y-direction value are respectively 1.28 and 1.30.By changing the acousto-optic menu device significant level time, realize that number of pulses changes flexibly from 1 to hundreds of is individual in the individual pulse envelope, thereby realize the flexible adjustment of laser peak power.Observe individual pulse output waveform figure and a plurality of pulse output waveform figure.As can be seen from the results, but the high-peak power picosecond laser of the utility model output umber of pulse flexible has the flexibly adjustment of gain amplifier height, peak power, good beam quality, the advantage such as stable, can commercialization be used for the picosecond laser application.
What need to understand is: the above only is preferred implementation of the present utility model; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (4)
1. but high-peak power picosecond laser of exporting the umber of pulse flexible, it is characterized in that: comprise semiconductor diode (1), laser crystal (5), Faraday polarization apparatus (7) and psec optical fiber seed source (13), semiconductor diode (1) is connected first lens (2) and the second lens (3) successively, the second lens (3) are connected the first level crossing (4), the first level crossing (4) is connected laser crystal (5), laser crystal (5) is connected the second level crossing (6), described psec optical fiber seed source (13) is connected the 4th lens (12), the 4th lens (12) are connected acousto-optic pulse menu device (11), acousto-optic pulse menu device (11) is connected the 3rd lens (10), the 3rd lens (10) are connected film polarizer (9), film polarizer (9) is connected the 3rd level crossing (8), the 3rd level crossing (8) is connected Faraday polarization apparatus (7), and Faraday polarization apparatus (7) is connected mutually with the first level crossing (4).
2. but a kind of high-peak power picosecond laser of exporting the umber of pulse flexible according to claim 1, it is characterized in that: described semiconductor diode (1) is that power output is the 888.5nm wave band semiconductor diode of 150W, its tail optical fiber core diameter is 400 microns, numerical aperture NA=0.22.
3. but a kind of high-peak power picosecond laser of exporting the umber of pulse flexible according to claim 1, it is characterized in that: described laser crystal (5) is Nd:YVO4, crystal has the angle of wedge, and crystal doping concentration is 0.5%～1%, and crystal length is positioned at 25～50mm.
4. but a kind of high-peak power picosecond laser of exporting the umber of pulse flexible according to claim 1, it is characterized in that: described psec optical fiber seed source (13) is that the seed source frequency is 10MHz～80MHz fiber laser.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220448971.9U CN202817481U (en) | 2012-09-05 | 2012-09-05 | High-peak power picosecond laser with flexibly adjustable output pulse number |
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| CN201220448971.9U CN202817481U (en) | 2012-09-05 | 2012-09-05 | High-peak power picosecond laser with flexibly adjustable output pulse number |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684688A (en) * | 2017-02-22 | 2017-05-17 | 中国科学院光电研究院 | Regenerative amplifier device with adjustable pulse energy and time intervals |
-
2012
- 2012-09-05 CN CN201220448971.9U patent/CN202817481U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684688A (en) * | 2017-02-22 | 2017-05-17 | 中国科学院光电研究院 | Regenerative amplifier device with adjustable pulse energy and time intervals |
| CN106684688B (en) * | 2017-02-22 | 2019-04-09 | 中国科学院光电研究院 | A kind of pulse energy and the adjustable regenerative amplification device of time interval |
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| GR01 | Patent grant | ||
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Granted publication date: 20130320 |