CN102882110A - Device for amplifying medium/large-aperture laser - Google Patents
Device for amplifying medium/large-aperture laser Download PDFInfo
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- CN102882110A CN102882110A CN2012103401673A CN201210340167A CN102882110A CN 102882110 A CN102882110 A CN 102882110A CN 2012103401673 A CN2012103401673 A CN 2012103401673A CN 201210340167 A CN201210340167 A CN 201210340167A CN 102882110 A CN102882110 A CN 102882110A
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Abstract
The invention discloses a device for amplifying medium/large-aperture laser. The device comprises a beam reducing unit and a laser diode (LD) side pump laser amplifier arranged at the output end of the beam reducing unit. According to the device, on the premises of providing high gain for the medium/large-aperture laser and maintaining the quality of the laser, repetition frequency is greatly improved, and the size of the device for amplifying the medium/large-aperture laser is reduced. The device is particularly applied to the condition of low thermal conductivity of a working medium of the laser amplifier as well as the application of linearly polarized light.
Description
Technical field
The present invention relates to laser technology field, specifically, the present invention relates to the device that a kind of centering large-caliber laser amplifies.
Background technology
In the laser system, the quality (comprising the characteristics such as pulsewidth, live width) that sometimes needs to obtain high laser energy or power and keep laser.For the laser beam of Large diameter (for example more than the 10mm), the lamp pumping image intensifer that normal operation laser crystal bore is larger in the prior art amplifies.This laser amplifier scheme can provide larger gain and the basic beam quality that keeps, yet because the size of laser crystal is large, its heat radiation is relatively poor, especially for the less laser working medium of thermal conductivity (for example Nd:glass), the problems referred to above are more outstanding.This causes the repetition rate of this type of laser amplification device low especially, is generally 20 minutes once.
Therefore, current in the urgent need to a kind of cooling, device that the centering large-caliber laser that repetition rate is higher amplifies of being easy to.
Summary of the invention
The purpose of this invention is to provide a kind of cooling, device that the higher centering large-caliber laser of repetition rate amplifies of being easy to.
For achieving the above object, the invention provides the device that a kind of centering large-caliber laser amplifies, comprise contracting Shu Danyuan and the LD profile pump laser amplifier that is arranged on described contracting Shu Danyuan output.
Wherein, described contracting Shu Danyuan comprises contracting bundle lens and the collimating lens that sets gradually.
Wherein, the device that described centering large-caliber laser amplifies also comprises polarizer, 1/4th slides and total reflective mirror, described polarizer, contracting bundle lens, collimating lens, LD profile pump laser amplifier, 1/4th slides and total reflective mirror set gradually along light path, and the described polarizer not optical axis with main optical path is vertical.
Wherein, also be provided with the 2nd LD profile pump laser amplifier between described contracting bundle lens and the collimating lens.
Wherein, described the 2nd LD profile pump laser amplifier is arranged near the focus of described contracting bundle lens, make light beam when passing described the 2nd LD profile pump laser amplifier, less than the amplification medium bore, and the energy-flux density that makes the hot spot that projects its amplification medium is less than its damage threshold at the hot spot bore of its amplification medium both sides.
Wherein, described the 2nd LD profile pump laser amplifier is arranged near the focus of described contracting bundle lens, make light beam when passing described the 2nd LD profile pump laser amplifier, less than 80% of amplification medium bore, and the energy-flux density that makes the hot spot that projects its amplification medium is less than its damage threshold at the hot spot bore of its amplification medium both sides.
Wherein, described the 2nd LD profile pump laser amplifier is arranged between the focus of described contracting bundle lens and described contracting bundle lens.
Wherein, described the 2nd LD profile pump laser amplifier is arranged between the focus and described collimating lens of described contracting bundle lens.
Wherein, also be provided with the 3rd LD profile pump laser amplifier between described contracting bundle lens and the collimating lens, described second, third LD profile pump laser amplifier is separately positioned on the focus both sides of described contracting bundle lens, and all meet the following conditions: light beam is when passing the amplification medium of profile pump laser amplifier, less than 80% of amplification medium bore, and the energy density that makes the hot spot that projects amplification medium is less than its damage threshold at the hot spot bore of amplification medium both sides.
Compared with prior art, the present invention has following technique effect:
1, the present invention is providing larger gain and is keeping greatly having improved repetition rate under the prerequisite of laser quality for Large diameter laser.
2, the present invention has dwindled the volume of the device that the centering large-caliber laser amplifies.
3, the present invention is specially adapted to the situation of thermal conductivity less (for example Nd:glass) of the working media of laser amplifier.
4, the present invention is particularly suitable for linearly polarized light is amplified.
Description of drawings
Fig. 1 shows the light path schematic diagram of the device that the centering large-caliber laser of one embodiment of the invention amplifies;
Fig. 2 shows the light path schematic diagram of the device that the centering large-caliber laser of another embodiment of the present invention amplifies;
Fig. 3 shows the schematic diagram in the too short situation of the contracting bundle focal length of lens;
Fig. 4 shows light beam in the one embodiment of the invention arrives focus by the laser working medium of the 2nd LD profile pump laser amplifier from contracting bundle lens schematic diagram.
Embodiment
Fig. 1 shows the device that the centering large-caliber laser in the one embodiment of the invention amplifies, as shown in Figure 1, this device comprises successively along light path: polarizer 1, contracting bundle lens 2, collimating lens 3, LD profile pump laser amplifier 4 (full name of LD is laser diode), 1/4th slides 5 and total reflective mirror 6.Be convenient and describe, hereinafter many places with LD profile pump laser amplifier referred to as the LD amplifier.
The device of present embodiment is suitable for linearly polarized laser is amplified.Under the operating state, linearly polarized laser to be amplified sees through polarizer 1, by contracting bundle lens 2 contracting of heavy caliber hot spot is restrainted again, again by collimating lens 3 collimations, form small-bore collimated light beam (its bore is less than the bore of the laser working medium of LD profile pump laser amplifier 4), this small-bore collimated light beam amplifies by LD profile pump laser amplifier 4, again by 1/4th slides 5, through total reflective mirror 6 reflections, again for the second time by 1/4th slides 5, obtain the polarised light of 90-degree rotation, and then through the amplification of LD profile pump laser amplifier 4, small-bore collimated light beam after obtaining amplifying, again by collimating lens 3 and contracting bundle lens 2, by polarizer 1 reflection, export and the Large diameter laser for the treatment of that the amplifying laser bore is consistent.Wherein, when polarizer 1 was set, this polarizer 1 not optical axis with main optical path was vertical, was convenient to like this to export the Large diameter laser after the amplification.As shown in Figure 1, take treat amplifying laser as horizontal linear polarization light as example, horizontal linear polarization light enters from A, behind the device that amplifies through described centering large-caliber laser, horizontal polarization light becomes orthogonal polarized light, with former bore from the B outgoing.
Laser working medium in the laser amplifier of LD profile pump, bore is usually less (generally below several mm, modal is cylindrical structure, bore is Φ 2mm ~ Φ 3mm), usually be not used in the laser amplifier of Large diameter, but the repetition rate of LD profile pump laser amplifier is often much larger than the lamp pump laser that uses the same laser working media.For example, the operating frequency of LD profile pump Nd:glass laser amplifier can accomplish that 1Hz(namely 1 second once).Above-described embodiment has utilized these characteristics of LD profile pump laser amplifier just, the device that the centering large-caliber laser that provides a kind of round trip to amplify amplifies, this device can provide larger gain, and can keep the laser quality, can greatly improve operating frequency again, also have simultaneously the little effect that takes up room.
Fig. 2 shows the device that the centering large-caliber laser of another embodiment of the present invention amplifies, this device is to increase the 2nd LD profile pump laser amplifier 7, the two LD profile pump laser amplifiers 7 on the basis of embodiment 1 to be arranged between contracting bundle lens 2 and the collimating lens 3.And, described the 2nd LD profile pump laser amplifier 7 is arranged near the focus of contracting bundle lens 2, so that cone-shaped beam is when passing the amplification medium of LD amplifier, less than the medium bore, and the energy density that makes the hot spot that projects amplification medium is less than its damage threshold at the hot spot bore of amplification medium both sides.
In a preferred embodiment, adopt the long contracting bundle lens 2 of focal length, the 2nd LD profile pump laser amplifier 7 is arranged near the focus of contracting bundle lens 2, so that light beam (from the cone-shaped beam that contracts bundle lens incident and return from collimating lens) is when passing the amplification medium of LD amplifier, less than 80% of amplification medium bore, and the energy density that makes the hot spot that projects amplification medium is less than its damage threshold at the hot spot bore of amplification medium both sides.If the focal length of contracting bundle lens 2 is too short, the hot spot bore may appear greater than the situation of medium bore, and as shown in Figure 3, this situation may cause whole laser amplification device to work.If the hot spot bore is slightly less than the medium bore, then diffraction effect may occurs, thereby cause beam quality to descend.Through inventor further investigation, find when the hot spot bore of amplification medium both sides less than the medium bore 80% the time, can avoid well occurring diffraction effect, make beam quality remain on higher level.
In a preferred embodiment, the concrete scope of LD amplifier setting position is determined as follows:
Near focus, because the bore of hot spot is little, energy-flux density is high.Therefore, the placement location of the 2nd LD profile pump laser amplifier 7 need to calculate according to the damage threshold of laser working medium in the energy of hot spot and the 2nd LD profile pump laser amplifier.For example, the energy of contracting bundle lens 2 front launching spots is a(J), bore is b(cm) * b(cm), the damage threshold of laser working medium is kJ/cm in the LD amplifier
2Fig. 4 shows light beam arrives focus by the laser working medium of the 2nd LD profile pump laser amplifier from contracting bundle lens schematic diagram, wherein, F represents the focal length of lens, a is the energy of the parallel hot spot of contracting bundle lens 2 front incidents, b is the beam size (length of side) of the parallel hot spot of contracting bundle lens 2 front incidents, c is the beam size that the contracting light beams incides hot spot on the laser working medium, and L is that LD amplifier right side is apart from the distance of the focus of contracting bundle lens 2.
By similar triangles relation among Fig. 4, can get
Thereby have
c＝bL/F （1）
In addition, the energy-flux density of the laser working medium rightmost side (being the less side of hot spot) is not less than the damage threshold of laser working medium in the LD amplifier, energy-flux density=energy/area near the LD amplifier of placing the focus.
Namely
(1) substitution is got
Have again
That is to say that the 2nd LD amplifier right side is satisfied apart from the distance L of the focus of contracting bundle lens 2
And on the other hand, the placement location of the 2nd LD amplifier needs also to guarantee that the hot spot bore of the leftmost side of its laser working medium is less than 80% of the bore of laser working medium.
The below introduces an example that the square hot spot of 10mm * 10mm is carried out 1000 times of amplifications.In this example, the square hot spot directional light of 10mm * 10mm injects Implantation Energy 0.11mJ.Laser working medium is nd:glass, and refractive index is 1.53.Adopt LD side pump amplifier to amplify, its operating frequency 10Hz, the working media bore is
Length is 70mm, pump energy 3.6J, 100 times of double-pass gains (the gain multiple can change with the pumping current by control LD amplifier, refers to that herein the highest double-pass gain is 100 times).The radius of curvature of contracting bundle lens is 545.5mm, and focal length is 1078mm, and thickness is 8mm, and the radius of curvature of collimating lens is 70.55mm, and focal length is 139mm, and thickness is 3mm.Bore is that the incident light of 10mm * 10mm becomes the directional light that bore is 1.3mm * 1.3mm after by contracting bundle lens and collimating lens.The refractive index of the working media in the LD amplifier is 1.53, and collimating lens is 163mm to the distance of total reflective mirror.The LD amplifier is arranged between collimating lens and the total reflective mirror and gets final product.The 2nd LD amplifier is arranged near the focus of contracting bundle lens, and particular location is that the preamble formula is satisfied in this position apart from contracting bundle lens focus 398mm place
And can guarantee that the hot spot bore of the leftmost side of laser working medium of the 2nd LD amplifier is less than the laser working medium bore
80%.Suitably regulate the pumping current of two LD amplifiers, be used polarizer, i.e. the square hot spot of 10mm * 10mm of exportable energy 110mJ.As a comparison, if directly by lamp pump side pump amplifier the square hot spot of 10mm * 10mm is carried out 1000 times of amplifications.Its operating frequency 20min then, the working media bore is
Length is 340mm, and pump energy is up to 800J.
Above-described embodiment uses two LD amplifiers that laser is amplified, and with respect to the embodiment that only uses a LD amplifier, can provide larger gain for Large diameter laser, and also substantially can keep preferably beam quality.In addition, need to prove that the 2nd LD amplifier both can be positioned over focus left side (between contracting bundle lens and the contracting bundle lens focus), also can be positioned over focus right side (between contracting bundle lens focus and the collimating lens).Certainly, in other embodiments, can also increase again the 3rd a LD amplifier, the 3rd LD amplifier and the 2nd LD amplifier are separately positioned on the both sides (contracting, bundle lens and contracting are restrainted between the lens focus, lens focus is restrainted in contracting and the collimating lens among arranges a LD amplifier) of the bundle lens focus that contracts, and all meet the following conditions: light beam is when passing the amplification medium of LD amplifier, less than 80% of amplification medium bore, and the energy density that makes the hot spot that projects amplification medium is less than its damage threshold at the hot spot bore of amplification medium both sides.This scheme can further improve the gain of whole amplifying device.
In addition, in other embodiments of the invention, the device that the centering large-caliber laser amplifies also can be comprised of contracting Shu Danyuan and LD amplifier, and it is small-bore laser that contracting Shu Danyuan is used for Large diameter laser contracting bundle, is then amplified by the LD amplifier.Contracting Shu Danyuan can be made of contracting bundle lens and the collimating lens placed successively.In this scheme, do not have speculum behind the LD amplifier, light beam is directly output after amplifying by the LD amplifier.With respect to traditional lamp pump amplifier scheme, this scheme of amplifying based on the one way of LD amplifier can provide relatively large gain equally, and can reach the effect that improves operating frequency.The small-signal gain by one path of amplifier is:
G
0=exp(g
0l)=exp(KP
pump)
G in the formula
0Be small signal gain coefficient; P
PumpDraw power for diode laser matrix; K is the efficient parameter of being determined by amplifier pumping structure, gain media absorption characteristic, pumping light and main laser wavelength ratio etc., the cross-sectional area A of this efficient parameter K and laser amplification medium is inverse ratio, that is to say that it is relevant with the pumping sectional area to gain, and pumping length is irrelevant.Therefore, the cross-sectional area of laser amplification medium (such as the neodymium glass rod) is less just more can obtain higher gain by one path.In sum, amplify if directly carry out bigbore beam energy by lamp pump side pump amplifier, the lamp pump amplifier must be selected bigbore laser medium.And if with behind the light contracting bundle, carrying out small-bore beam energy by LD side pump amplifier again amplifies, the LD amplifier can be selected small-bore laser amplification medium.Under the contrast, the laser amplifier gain that has small-bore laser amplification medium is higher.On the other hand, if Implantation Energy and output energy coincidence, the pump power of lamp pump side pump amplifier will be high more a lot of than LD side pump amplifier.Pump power is high, and thermal effect will be very serious, and to the heat-sinking capability (thermal diffusion coefficient) of crystal, the cooling device of auxiliary crystal heat radiation requires just very high.Originally with regard to very low neodymium glass, heat dissipation problem solves bad for thermal diffusion coefficient, just can only reduce the operating frequency of lamp pump side pump amplifier, so its repetition is 20 minutes.If adopted small-bore LD side pump amplifier, because gain is high, pump power itself is just little on the one hand; On the other hand, because the bore of working media is little, it is also much easier to dispel the heat, and its repetition is generally 1 ~ 3Hz, namely one second 1 ~ 3 time.
The device that the centering large-caliber laser of the various embodiments described above amplifies can also consist of the centering large-caliber laser by cascade and carry out the laser amplifier system that multipass amplifies, and this is that those skilled in the art are understandable.
At last, the above embodiments only are used for illustrating the present invention, and it should not be construed is that protection scope of the present invention is carried out any restriction.And, it will be apparent to those skilled in the art that do not breaking away under above-described embodiment spirit and the principle, the various equivalent variation that above-described embodiment is carried out, modification and in the text not the various improvement of description all within the protection range of this patent.
Claims (9)
1. the device that the centering large-caliber laser amplifies comprises contracting Shu Danyuan and the LD profile pump laser amplifier that is arranged on described contracting Shu Danyuan output.
2. the device that amplifies of centering large-caliber laser according to claim 1 is characterized in that, described contracting Shu Danyuan comprises contracting bundle lens and collimating lens, and described collimating lens is between described contracting bundle lens and described LD profile pump laser amplifier.
3. the device that amplifies of centering large-caliber laser according to claim 1, it is characterized in that, also comprise polarizer, 1/4th slides and total reflective mirror, described polarizer, contracting bundle lens, collimating lens, LD profile pump laser amplifier, 1/4th slides and total reflective mirror set gradually along light path, and the described polarizer not optical axis with main optical path is vertical.
4. the device that amplifies of centering large-caliber laser according to claim 3 is characterized in that, also is provided with the 2nd LD profile pump laser amplifier between described contracting bundle lens and the collimating lens.
5. the device that amplifies of centering large-caliber laser according to claim 4, it is characterized in that, described the 2nd LD profile pump laser amplifier is arranged near the focus of described contracting bundle lens, make light beam when passing described the 2nd LD profile pump laser amplifier, less than the amplification medium bore, and the energy-flux density that makes the hot spot that projects its amplification medium is less than its damage threshold at the hot spot bore of its amplification medium both sides.
6. the device that amplifies of centering large-caliber laser according to claim 5, it is characterized in that, described the 2nd LD profile pump laser amplifier is arranged near the focus of described contracting bundle lens, make light beam when passing described the 2nd LD profile pump laser amplifier, less than 80% of amplification medium bore, and the energy-flux density that makes the hot spot that projects its amplification medium is less than its damage threshold at the hot spot bore of its amplification medium both sides.
7. according to claim 5 or the device that amplifies of 6 described centering large-caliber lasers, it is characterized in that described the 2nd LD profile pump laser amplifier is arranged between the focus of described contracting bundle lens and described contracting bundle lens.
8. according to claim 5 or the device that amplifies of 6 described centering large-caliber lasers, it is characterized in that described the 2nd LD profile pump laser amplifier is arranged between the focus and described collimating lens of described contracting bundle lens.
9. the device that amplifies of centering large-caliber laser according to claim 4, it is characterized in that, also be provided with the 3rd LD profile pump laser amplifier between described contracting bundle lens and the collimating lens, described second, third LD profile pump laser amplifier is separately positioned on the focus both sides of described contracting bundle lens, and all meet the following conditions: light beam is when passing the amplification medium of profile pump laser amplifier, less than 80% of amplification medium bore, and the energy density that makes the hot spot that projects amplification medium is less than its damage threshold at the hot spot bore of amplification medium both sides.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4194813A (en) * | 1978-10-13 | 1980-03-25 | The United States Of America As Represented By The United States Department Of Energy | Vacuum aperture isolator for retroreflection from laser-irradiated target |
| CN1063778A (en) * | 1991-01-31 | 1992-08-19 | 北京工业大学 | Wide-band turning ultra-short pulse laser system |
| US5491707A (en) * | 1994-08-24 | 1996-02-13 | Jamar Technologies Co. | Low cost, high average power, high brightness solid state laser |
| US6553052B1 (en) * | 1999-12-16 | 2003-04-22 | Advanced Optical Technology Ltd. | Solid-state laser |
| US20040156414A1 (en) * | 2003-01-08 | 2004-08-12 | Govorkov Sergei V. | Excimer or molecular fluorine laser with bandwidth of less than 0.2 pm |
-
2012
- 2012-09-13 CN CN201210340167.3A patent/CN102882110B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4194813A (en) * | 1978-10-13 | 1980-03-25 | The United States Of America As Represented By The United States Department Of Energy | Vacuum aperture isolator for retroreflection from laser-irradiated target |
| CN1063778A (en) * | 1991-01-31 | 1992-08-19 | 北京工业大学 | Wide-band turning ultra-short pulse laser system |
| US5491707A (en) * | 1994-08-24 | 1996-02-13 | Jamar Technologies Co. | Low cost, high average power, high brightness solid state laser |
| US6553052B1 (en) * | 1999-12-16 | 2003-04-22 | Advanced Optical Technology Ltd. | Solid-state laser |
| US20040156414A1 (en) * | 2003-01-08 | 2004-08-12 | Govorkov Sergei V. | Excimer or molecular fluorine laser with bandwidth of less than 0.2 pm |
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| CN102882110B (en) | 2015-07-01 |
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