CN1015587B - Variable focus traveling-wave pump method - Google Patents
Variable focus traveling-wave pump methodInfo
- Publication number
- CN1015587B CN1015587B CN 89105592 CN89105592A CN1015587B CN 1015587 B CN1015587 B CN 1015587B CN 89105592 CN89105592 CN 89105592 CN 89105592 A CN89105592 A CN 89105592A CN 1015587 B CN1015587 B CN 1015587B
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- CN
- China
- Prior art keywords
- laser
- frustum cone
- cone mirror
- max
- traveling
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The present invention belongs to a variable focus traveling-wave pumping method in the field of optics and laser technique. A circular table-board lens is used as a laser convergent component; a pumping source is a laser with an ultra-short pulse, and is capable of pumping linear or plane working substances. Parallel laser beams are transmitted onto the curved surface of the circular table-board lens in the mode vertical to the central axis line of the circular table-board lens; both ends of the focal lines of the parallel laser beams can be used as input ends and output ends, or can be provided with reflection cavity plates. The focus continuously changes along with the continuous change of the curve radius of the circular table-board lens. The focal lines do not intersect with the circular table-board lens; the length of the focal lines can be regulated. The present invention can be used for laser oscillators or amplifiers, especially for X-ray lasers, the laser targets of which are easy to fix and convenient to support. The present invention also has the advantage of high refraction efficiency.
Description
This method belongs to Application Optics and laser technology field.
Technical background: proposed traveling-wave pump method by West Germany professor F.P.Schaefer and be used for x-ray laser research in 1986.This traveling-wave pump is to make convergent component with coaxial light cone, the ultraviolet band ultra-short pulse laser is reflexed on the target fiber, target by laser lighting after, produce high-temperature high-density plasma.These plasmas are the needed operation material of x-ray laser just.The illumination path and the method thereof of coaxial light cone are shown in Fig. 1.(West Germany, F.P.Schaefer, " ON Some Pooperfies of Axicono "＜Appl.Phy.B, 39,1-8,86 〉) after Ultra-Violet Laser incides coaxial light cone from right to left, the light of cylindrical is through the left end (far-end) of conical reflecting to target fiber, the light path of walking is the longest, is in the right-hand member (near-end) of the through target of light of beam center, and the light path of walking is the shortest.Walk the light of the shortest optical path, at first act on the near-end of target, with the spreading of laser wave, little by little act on the target then from the light that leaves beam center.Target fiber is produced plasma by Ultra-Violet Laser irradiation from right to left side, and is arrived upper state by pumping.Realized that plasma is by the traveling-wave pump of the progressively pumping of advancing of laser wave.This traveling-wave pump has solved in the x-ray laser research, with aspheric surface is parabolic lens (Shanghai ray machine institute,＜Chinese science〉(A) 26, P657,83, Invesligatio of soft x-ray popution Inversion in Jaser Produced Plasma " cylindrical mirror (French P.Jaegle etc.; " X-ray Jaser reserch at palaeseau "＜Internation Colloquium on X-ray Jasers; 86〉etc. to do laser energy convergent component institute unvanquishable; the process of excited state life-span that short-pulse laser pumping homopolarity is short and X-ray transmission; be difficult to the problem of mating in time, traveling-wave pump method has also been removed to the acquisition x-ray laser will expend huge fund and has been gone to set up huge laser system simultaneously.
But, find out that by pumping process the issuable x-ray laser of wire plasma of circular cone illumination can only be drawn away from vertex of a cone direction towards left end, and can not export towards the right-hand member direction.This is the existence because of circular cone top itself, nor can add the speculum of X ray at the two ends of wire plasma, constitutes laser oscillation cavity or x-ray laser chamber.Same reason, even the ripple pumping is to high particle grain inversion level for plasma, it can not be used as the x-ray laser amplifier.
Purpose of the present invention, in order to overcome above-mentioned pointed existing problems, make focal line not with assemble elements intersect, do operation material, the development that helps target and the installation of x-ray laser vibration or amplification with the wire plasma, the traveling-wave pump method of varifocal is proposed, and this traveling-wave pump method also can be used for other laser.
The present invention comprises pumping source, convergent component by shown in Figure 2, be used to produce working-laser material by pumped material and as the speculum of laser oscillation cavity plate, its convergent component is a frustum cone mirror.
By the parallel laser light beam that pumping source provides, be perpendicular to as the central axis of the frustum cone mirror of convergent component and incide on the frustum cone mirror curved surface, through the frustum cone mirror effect, collimated light beam is converged to a focal line.One little angle β is arranged between this focal line and the central axis, and the speculum vertical with focal line all can be settled in the two ends of focal line, perhaps as the input/output terminal of amplifier.
The radius of curvature of frustum cone mirror is from R
Max(maximum radius) is to (R
MaxLeast radius) continuously changes its focal distance f
2Also be continually varying, collimated light beam after frustum cone mirror is assembled, the hot spot f of formation
1f
2Be wire, be called focal line.
The focal distance f of frustum cone mirror
2Expression formula is:
f
2＝[1/（n-1）][R
max-Z（tgα）]……（1）
(1) n is the refraction coefficient of frustum cone mirror material therefor in the formula, R
MaxIt is the maximum radius of frustum cone mirror; Z is that the point that will calculate is to frustum cone mirror maximum radius R
MaxThe distance of nose circle face, α is that frustum cone mirror bus and radius are R
MaxAngle between the nose circle face.
The focal line f of frustum cone mirror
1f
2The length expression formula be:
f
1f
2＝（R
max-R
min）/cos｛tg
-1[H/（R
max-R
min]｝……（2）
(2) H is the height of frustum cone mirror in the formula, R
MinBe the frustum cone mirror least radius.
When the width h of light beam is not equal to the high H of frustum cone mirror, that is to say, when light beam incides on the frustum cone mirror, when light beam can not be full of frustum cone mirror, light beam after assembling, the focal line f of acquisition
1f
2Its expression formula is:
f
1f
2＝（r
2-r
1）/cos｛tg
-1[h/（r
2-r
1）]｝……（3）
(3) r in the formula
2, r
1Be respectively wide for the collimated light beam of h incides on the frustum cone mirror, its edge is corresponding to frustum cone mirror R
Max, and R
MinRadius.
The focal line f of frustum cone mirror
1f
2And the angle β expression formula between the central axis of frustum cone mirror is:
β＝ctg
-1[（R
max-R
min）/H（n-1）]……（4）
, can draw to (4) from formula (1):
1) focal length continuously changes;
2) focal spot that obtains after the focusing is a wire, and with central axis one little angle β is arranged.
3) though focal line and central axis have an angle β, focal line not with assemble elements intersect.
Above-mentioned frustum cone mirror can be the round table surface lens, can be the round table surface speculum also, referring to Fig. 4.
Advantage of the present invention:
1. this varifocal traveling-wave pump method, focal line not with assemble elements intersect, input/output terminal all can be made in the focal line two ends, perhaps puts speculum.So the high population inversion medium that pumping obtains both can have been made the operation material of amplifier, also can make the operation material of oscillator, especially seemed more outstanding for x-ray laser;
2. the medium that this method can pumping is not only a wire, also can be plane, can accurately be placed on the focal spot by the medium of pumping, and whole focal spot can out of focus;
3. method for pumping of the present invention, focal spot f
1f
2Adjust easily, its length can make light beam pulse width and lifetime of excited state mate in time, and refraction efficient height;
4. the present invention can be used for pumping wire or plane target, thereby has reduced the development of target and fixing difficulty.
Description of drawings:
Fig. 1, coaxial light cone focused light passages figure.1 collimated light beam; 2 coaxial light cones with holes; 3 focal lines.
Fig. 2, varifocal traveling-wave pump method schematic diagram.2-a is as the laser oscillator schematic diagram; 2-b is as the schematic diagram of amplifier.4 round table surface lens; 5 targets; M1, M2 laser cavity plate.
Fig. 3, frustum cone mirror varifocal principle schematic.The 3-a geometric coordinate; The profile on 3-b-y-z plane.
Fig. 4, frustum cone mirror focused light passages figure.4-a is the round table surface lens, and 4-b is the round table surface speculum.
Fig. 5, the dye laser of varifocal pumping, the collimated light beam of 6 pumping sources, 7 dyestuff grooves; 8 dye lasers.
Embodiment 1:
The pumping source parameter: 5 joules of laser energies, pulse duration are 50 picoseconds, and the angle of divergence is 0.1 milliradian, the row ripple in the 50PS(picosecond) in transmission range be 1.5 centimetres.Obtain 1.3 * 10
14W/cm
2Power, consider the problem of beam divergence angle, focal length mean value should be got 5 centimetres, the round table surface lens parameter then is:
When n=1.53,
Radius R
Max=1.35cm, R
Min=2.15cm;
Focal distance f
Max=5.94cm, f
Min=4.05cm;
Because of different focal for the laser beam of the angle of divergence near diffraction limit, the focal spot of generation differs minimum.Then in the 0.1mrd(milliradian) time corresponding f
MaxWith f
MinCause that the focal spot difference only is 0.9 μ m.
Obtaining every centimetre with above-mentioned pumping condition is 10 gain media, can provide 15 times multiplication factor on 1.5 centimetres of x-ray laser amplifiers.
Embodiment 2:
The round table surface lens are used for dye laser.Can make the dye laser of compact varifocal traveling-wave pump, bonding or be processed into one frustum cone mirror and dye cell.The round table surface lens design becomes least radius r
Min=15mm, maximum radius r
Max=25mm; During the material n=1.53 that adopted, the focal distance f of lens then
Min=28.3mm, f
Max=47.1mm.
Claims (3)
1, a kind of traveling-wave pump method that belongs to the varifocal of Application Optics and laser technology field is characterized in that method of the present invention is perpendicular to focal distance f with parallel laser beam
2Be to incide on this convergent component on the central axial direction of continually varying convergent component, this converging light projects and gathers into a focal line on the working-laser material, though a little angle β is arranged between its focal line and the convergent component central axis, makes its convergent component and focal line non-intersect.
2, the traveling-wave pump method of a kind of varifocal according to claim 1 is characterized in that convergent component is a frustum cone mirror, and the radius of curvature of frustum cone mirror is from maximum radius R
MaxTo least radius R
MinContinuously change its focal distance f
2Also with its continuous variation, expression formula is:
f
2＝1/n-1[R
max-Z（tgα）]……（1）
The focal line f of frustum cone mirror
1f
2Expression formula be:
f
1f
2＝（R
max-R
min）/cos[tg
-1（H/R
max-R
min）]……（2）
(1) n is the refraction coefficient of material that frustum cone mirror adopts in the formula, and Z is that the point that will calculate is to frustum cone mirror maximum radius R
MaxThe distance of nose circle face, α is frustum cone mirror bus and radius R
MaxAngle between the nose circle face, H is the height of frustum cone mirror in (2) formula.
3, the traveling-wave pump method of a kind of varifocal according to claim 1 and 2 is characterized in that the frustum cone mirror as convergent component is round table surface lens or round table surface speculum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105592 CN1015587B (en) | 1989-08-08 | 1989-08-08 | Variable focus traveling-wave pump method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105592 CN1015587B (en) | 1989-08-08 | 1989-08-08 | Variable focus traveling-wave pump method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1049414A CN1049414A (en) | 1991-02-20 |
| CN1015587B true CN1015587B (en) | 1992-02-19 |
Family
ID=4856275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89105592 Expired CN1015587B (en) | 1989-08-08 | 1989-08-08 | Variable focus traveling-wave pump method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015587B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8553337B2 (en) * | 2007-11-12 | 2013-10-08 | Cornell University | Multi-path, multi-magnification, non-confocal fluorescence emission endoscopy apparatus and methods |
-
1989
- 1989-08-08 CN CN 89105592 patent/CN1015587B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1049414A (en) | 1991-02-20 |
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