CN85100026B - Colliding pulse double mode-locked laser - Google Patents
Colliding pulse double mode-locked laserInfo
- Publication number
- CN85100026B CN85100026B CN85100026A CN85100026A CN85100026B CN 85100026 B CN85100026 B CN 85100026B CN 85100026 A CN85100026 A CN 85100026A CN 85100026 A CN85100026 A CN 85100026A CN 85100026 B CN85100026 B CN 85100026B
- Authority
- CN
- China
- Prior art keywords
- laser
- locked
- dye
- pulse
- double mode
- Prior art date
- 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.)
- Expired
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Abstract
The present invention relates to a pulse-collision double locked mode laser which belongs to the field of stimulated emission devices. The present invention is a laser system which combines a pulse-collision mode-locked technique with a synchronous intracavity pump technique and can be synchronously operated on a locked mode with two wave lengths. Compared with an argon ion mode-locked synchronous laser pumping system with dye lasers, the present invention has the characteristics of simple structure, high stability, narrow pulse width, high conversion efficiency, low cost, etc. The present invention can be used for the researches of laser spectroscopy, non-linear optics, picosecond optronics and optical fibers.
Description
The invention belongs to the stimulated emission device field.
People such as (C.K.CHAN) U.S. scientist Zhan had delivered argon laser synchronous pump dye laser system (a) in 1974.In this system, at first utilize acousto-optic modulator with the argon laser locked mode, use the mode locking pulse sequence synchronous pump dye laser of argon laser then, realize the locked mode running of dye laser.1981, the Fu Ke of U.S.'s Bell Laboratory people (b) such as (R.L.FORK) has delivered pulse collision mode-locking (COOL IDING PULSE MODE-LOCKING, be called for short CPM) laser, in this laser, utilize the effect of the light pulse of rightabout propagation, dye laser is carried out locked mode in saturable absorber place coherent superposition.Nineteen eighty-three, Cook (D.K
HLKE) etc. people (c) has delivered straight chamber argon laser pulse collision mode-locking laser, in argon ion laser, realized the CPM running, the domestic and international at present argon laser synchronous pump dye laser system that generally adopts, there are two shortcomings: the one, argon ion laser is at first used the acousto-optic modulator locked mode, make this laser structure complexity, and have the mismatch problems of the long harmony light modulation frequency in chamber; The 2nd, argon ion laser and be respectively independently two resonant cavitys by the dye laser of its pumping, there is the long mismatch problems in two chambeies, therefore to adjusting and strictness of environmental condition requirement, often cause the unsteadiness of output pulse width and power, the CPM dye laser that people such as Fu Ke deliver, because argon ion laser is a continuously operating laser, very low with its pumping efficiency of dye, the straight chamber CPM argon ion laser that people such as Cook deliver, because its pulse strength is asymmetric, fail to realize the locked mode running of dyestuff.
The objective of the invention is to overcome above-mentioned three kinds of lasers shortcoming separately, and realized the pulse collision mode-locking of argon laser and the dual wavelength of dye laser in same symmetrical annular chamber first.We are called colliding pulse double mode-locked.
The resonant cavity system of laser of the present invention is made up of four concave mirrors, sees (1), (2), (3), (4) of accompanying drawing.Argon ion discharge tube (seeing (5) of accompanying drawing) places between two deep camber speculums (1), (2) (seeing accompanying drawing), and the dyestuff jet flow places the focus place of two small curve speculums (3), (4) (seeing accompanying drawing).Dyestuff jet flow (seeing (7) of accompanying drawing) is the ethylene glycol solution jet flow of rhodamine 6G, and it is again the gain media of dye laser both as the saturable absorption medium of argon laser, and its concentration is 10
-4～10
-2Molar concentration (M/L).In symmetrical annular chamber, two argon laser pulses and two each comfortable dyestuff jet flow places of dye laser pulse that propagate in opposite direction of propagating in opposite direction collide.Because the relevant effect when in opposite direction two pulses collide at dyestuff jet flow place and to the genlocing effect of zlasing mode just realizes the colliding pulse double mode-locked of argon laser and dye laser simultaneously.The space periodic that forms distribution of light intensity in the zone of two superimposed pulses distributes.Because the space periodic that dye molecule to the absorption of light field, has caused population to distribute distributes, and is called transient state population distribution " grating ".The forming process of being somebody's turn to do " grating " also is that the collision locked mode process to argon laser is bleached thereby caused to dyestuff.The dyestuff of being bleached, its molecule that is in energy level forms population inversion with respect to another following energy level (different with the following energy level that absorbs argon laser), therefore cause with this to the corresponding stimulated radiation of energy level, form the dye laser of locked mode.Because the saturable absorption medium that this dyestuff had not only been used as the collision locked mode of argon laser but also as the gain media of dye laser, the laser of two kinds of wavelength is shared identical last energy level simultaneously, therefore, have very strong coupling effect between dye laser and the argon laser, this effect makes that the pulse duration of argon laser and dye laser is all further compressed.
Because the present invention can produce several picoseconds (10
-12Second) to subpicosecond (10
-13Second) therefore laser pulse can be used for the research to the quick relaxation process of atom and molecule, and this invention also can be used for photosynthetic research in information exchanging process, the plant in chemical energy transfer process, the biology.In addition, this invention also can be the picosecond optoelectronic that grew up in recent years and the research of higher bit optical-fibre communications provides new means.The present invention compares with at present general both at home and abroad mode-locking argon ion laser sync-pumped dye laser system, acousto-optic modulator and high-frequency drive power supply thereof have been saved, with original two of constituting by five speculums independently resonant cavity be reduced to the resonant cavity that four speculums constitute, therefore the laser operation stability that should invent is better, and cost can reduce by 1/3rd.Because the present invention has adopted the intracavity pump mode, that part of light that is absorbed by dyestuff is not still stayed in the chamber, do not lose, so conversion efficiency can improve more than 30%.Because the present invention has adopted the CPM technology, pulse duration narrows down, and peak power improves, and therefore has a wide range of applications in the research of above-mentioned several fields and tangible economic benefit and social benefit.
The laser structure principle of this invention is seen accompanying drawing.Wherein (1) and (2) is the larger radius of curvature speculum, its radius of curvature R
1=R
2＞3 meters.(3) and (4) be the small curvature radius speculum, its radius of curvature R
3=R
4＜10 centimetres.Speculum (1), (3), (4) reflectivity in 510～620 millimicrons of bands of a spectrum be greater than 99.5%, speculum (2) for the reflectivity in 580～620 millimicrons of bands of a spectrum greater than 95%, and for 514.5 millimicrons of its reflectivity of bands of a spectrum greater than 99%.The angle that laser beam is located in mirror (1), (2), (3), (4) is respectively θ
1, θ
2, θ
3, θ
4Equate respectively, and less than 30 °.Distance between each speculum is respectively l
1, l
2, l
3, l
4, and l
1＞1.5 meters, l
2=l
4, l
3=R
3=R
4＜10 centimetres.(5) be the argon ion discharge tube.(6) be argon ion discharge tube power supply.(7) be the jet flow of dyestuff rhodamine 6G, its thickness is 100 μ m, is Brewster's angle and places.Can obtain pulse duration less than 2 picoseconds with above-mentioned laser.Average power is less than the laser pulse sequence of 20 milliwatts.
Description of drawings
As Figure of description.In symmetrical annular chamber, two argon laser pulses of Chuan Boing are located to collide in dyestuff jet flow (seeing (7) of accompanying drawing) in opposite direction.At when collision, two pulse generation interference effects, thereby the phase place of each pattern of argon laser locked, also bleached dye media simultaneously.The argon laser pulse that the dyestuff jet flow of bleaching allows to collide still divides supplementary biography to speculum (3) and (4) (seeing accompanying drawing) by jet flow then separately along the original direction of propagation.Biography is to the argon laser pulse of speculum (4), reflection successively through speculum (4), (1), enter from the left end of argon ion discharge tube (seeing (5) of accompanying drawing), amplify along with in discharge tube, propagating, this pulse is passed discharge tube and is passed to speculum (2), reflection through speculum (2), (3) arrives dyestuff jet flow (7) once more, prepares and another argon laser pulsion phase collision of transmitting in opposite directions; Meanwhile pass the argon laser pulse process speculum (3) to speculum (3), the reflection successively of (2), go into and then be exaggerated from the right-hand member of argon ion discharge tube, passing behind the discharge tube more successively, the reflection through speculum (1), (4) reaches dyestuff jet flow 7, once more with the argon laser colliding pulse that transmits in opposite directions, so go round and begin again, finish pulse collision mode-locking argon laser.
When the argon laser pulse of Chuan Boing bumps in the dyestuff jet flow in opposite direction, two dye laser pulses propagating in opposite direction in the chamber also bump in the dyestuff jet flow, thereby interfere effect, realization locks the phase place of each pattern of dye laser, and acquisition gains and is exaggerated from the dyestuff jet flow simultaneously.These two dye laser pulses still pass the dyestuff jet flow along the former direction of propagation separately after dyestuff jet flow (7) is located to collide.One passes to speculum (3), mirror (2) reflection is reflected after (3) arrive a part of power of (2) output, pass (5) again, get back to dyestuff jet flow (7) again through the reflection successively of speculum (1), (4), prepare to collide with the dye laser pulse that transmits in opposite directions, another passes the dye laser pulse to (4), warp (4), (1), reflection successively, pass (5) and reach (2), part output back is reached jet flow (7) through (3) again by (2) reflection and with the dye laser pulse that transmits in opposite directions collision once more takes place.Go round and begin again like this, finish locked mode running dye laser.
For the laser pulse that makes propagation in opposite direction has good intensity symmetry, thereby make collision locked mode optimum operation, the argon ion discharge tube should be placed between speculum (1), (2) between two parties.To adjust speculum (1), (2), (3) of annular chamber, the position and the angle of (4) meticulously, the argon ion laser beam in the chamber be overlapped fully, with the dye laser bundle so that dye laser obtains maximum gain.
Claims (6)
1, a kind of colliding pulse double mode-locked laser is characterized in that realizing simultaneously that the laser pulse of two kinds of wavelength collides the laser of twin-lock mould in a symmetrical annular chamber.Said symmetrical annular chamber is made up of four concave mirrors, and its radius of curvature is R
1, R
2, R
3, R
4, R
1=R
2＞3 meters, R
3=R
4＜10 centimetres.The beam angle at each speculum place is θ
1, θ
2, θ
3, θ
4, θ
1=θ
2=θ
3=θ
4＜30 ℃.Distance between each speculum is L
1, L
2, L
3, L
4, L
2=L
4, L
1＞1.5 meters.
2, by the said colliding pulse double mode-locked laser of claim 1, it is characterized in that in symmetrical annular chamber, placing simultaneously gas laser gain media and dye laser medium.
3,, it is characterized in that the gas laser gain media in the symmetrical annular chamber is that argon ion is as the gas laser gain media by the said colliding pulse double mode-locked laser of claim 2.
4,, it is characterized in that dye laser medium in the symmetrical annular chamber is to be dissolved in rhodamine 6G in the ethylene glycol solvent as dye laser medium by the said colliding pulse double mode-locked laser of claim 2.
5, by the said colliding pulse double mode-locked laser of claim 4, the dye laser medium rhodamine 6G dye solution in the symmetrical annular chamber is characterized in that solution concentration is 10
-4-10
-2The dye laser medium of gram molecule (M/L).
6, by the said colliding pulse double mode-locked laser of claim 4, the dye laser medium rhodamine 6G solution in symmetrical annular chamber is characterized in that rhodamine 6G dye laser medium solution sprays from nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100026A CN85100026B (en) | 1985-04-01 | 1985-04-01 | Colliding pulse double mode-locked laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100026A CN85100026B (en) | 1985-04-01 | 1985-04-01 | Colliding pulse double mode-locked laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100026A CN85100026A (en) | 1985-12-20 |
| CN85100026B true CN85100026B (en) | 1987-10-28 |
Family
ID=4790824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100026A Expired CN85100026B (en) | 1985-04-01 | 1985-04-01 | Colliding pulse double mode-locked laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100026B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958505B (en) * | 2010-07-31 | 2011-09-07 | 山西大学 | Frequency locking device for dual wavelength external cavity resonance system |
| CN113471801A (en) * | 2021-06-29 | 2021-10-01 | 西安电子科技大学 | Liquid film generating device and method for laser flowing collision mode locking |
-
1985
- 1985-04-01 CN CN85100026A patent/CN85100026B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100026A (en) | 1985-12-20 |
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