CN1007483B - Wide-band coupling multi-frequency tunable laser - Google Patents
Wide-band coupling multi-frequency tunable laserInfo
- Publication number
- CN1007483B CN1007483B CN 86103373 CN86103373A CN1007483B CN 1007483 B CN1007483 B CN 1007483B CN 86103373 CN86103373 CN 86103373 CN 86103373 A CN86103373 A CN 86103373A CN 1007483 B CN1007483 B CN 1007483B
- Authority
- CN
- China
- Prior art keywords
- prism
- chamber
- laser
- chambeies
- tunable laser
- 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
Links
- 238000010168 coupling process Methods 0.000 title claims abstract description 21
- 230000008878 coupling Effects 0.000 title claims abstract description 18
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 18
- 230000009183 running Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000010287 polarization Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000975 dye Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000990 laser dye Substances 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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- Lasers (AREA)
Abstract
The present invention relates to a wide band coupling method for a multifrequency tunable laser, which completely saves a laser beam splitter for coupling each branch tuning cavity in the general multifrequency tunable laser, and uses a beam-expanding prism to perform the functions of expanding laser beams and splitting the laser beams so as to not only simplify structure and have the characteristic of wide transmission bands.
Description
The present invention is a kind of multifrequency running tunable laser of wide passband coupling.General multi-frequency tunable laser (as dye laser), the coupling between each tuning chamber all must adopt various beam splitters to make coupling element.And coupling process of the present invention, it does not need special beam splitter, and utilize beam-expanding element-prism beam expander in the chamber-reflection directly be coupled with refraction.This coupling process is applicable in the tunable laser of various multifrequency runnings.
Now principle of the present invention is illustrated in conjunction with the accompanying drawings:
Fig. 1 is a schematic diagram of making the multi-frequency tunable laser of coupling element with various beam splitters,
Fig. 2 is a schematic diagram of making the multi-frequency tunable laser of coupling element with prism beam expander,
Fig. 3 is the schematic diagram of multi-frequency tunable laser that the prism beam expander coupling of pre-prism beam expander is arranged.
(1) is output reflector among Fig. 1, and (2) are working-laser material (as dye cell etc.), and (3) are beam splitter, and (4) and (6) are the light beam expander, and (5) and (7) are tuned cell-grating (work of auto-collimation state).The transmitted light of beam splitter (3) forms tunable chamber being made up of speculum (1) and grating (5), and is practicable to wavelength X
1Tuning; The reverberation of beam splitter (3) then forms another tunable chamber of being made up of speculum (1) and grating (7), and to wavelength X
2Tuning, thus DOUBLE-FREQUENCY TUNABLE laser output (λ obtained
1+ λ
2), promptly constitute the Michelson laser cavity that a double frequency turns round, as through repeatedly light beam splitting, then constitute the compound Michelson chamber of multifrequency, the light beam expander is generally all arranged in the chamber, be used for the extensible beam width, improve grating resolution, to press the spectral bandwidth of narrow laser.
In the existing multi-frequency tunable laser, all adopting " reflective-transmissive type " beam splitter to be coupled, mainly is with various semi-transparent semi-reflecting reflecting elements, as is coated with the speculum of thin metal layer or multilayer diel or the like.The transmitance of these speculums and reflectivity have certain selectivity to the light of different wave length, and in tuning process, the ratio of its transmitance and reflectivity changes, and to certain wavelength value promptly not thoroughly or not anti-, the passband of its coupling is not wide.
Or being divided into ordinary light (0 light) and non-ordinary light (e light) with polarization beam apparatus, the light of the mutual vertical polarization of two bundles are coupled, but at this moment the light polarization face of two kinds of wavelength (frequency) of output is inconsistent, and this uses majority is undesirable.When requiring more frequency, just more difficult, and also the price of this polarizer is very expensive again.
With beam splitter each tuning chamber is coupled, in general,, then needs (N-1) individual beam splitter if a N chamber (being N tuned frequency) is arranged.
The present invention proposes the method that a kind of beam splitter specially is coupled, as shown in Figure 2: (1) is completely reflecting mirror, and (2) are working-laser material, and (4) are prism beam expander, and (5) are grating.Light is with big angle α
1Incide on prism (4) the A face, a part projects on the grating (5) after refraction by prism, is formed tunable chamber (corresponding wavelength λ of one " formula of beginning to speak " by speculum (1) and grating (5)
1).Prism beam expander is under the condition of incidence of big angle, and most light projects on the B face of prism (6) in A face reflection, and in like manner, the light of its refraction will form second tuning chamber (the corresponding wavelength λ that is made up of speculum (1) and grating (7)
2).By refract light on prism beam expander (4) plane of incidence (A face) and reverberation beam splitting two tuning the chambeies that are coupled, and constitute the Michelson chamber of a double frequency running.At this moment the reverberation on prism (6) the B face is and contains two tunable wavelength (λ
1+ λ
2) laser output.If the reverberation on the B face will form the 3rd tuning chamber (corresponding wavelength λ after the C face refraction of prism (8)
2) and constitute one the three compound Michelson chamber of running frequently.At this moment the reverberation on prism (8) the C face is the laser output that contains three kinds of tunable wavelengths.In principle, can be with the 4th, the 5th ... until tunable the chamber of N " prism beam expander-grating combination ", and the compound Michelson chamber that a N who constitutes turns round frequently.
Here, a light beam-expanding element is not only in prism (4), (6), (8) etc., also is the light beam splitting element of " reflection-refractive " simultaneously.Like this, not only save special beam splitter, simplified the structure, reduced expense (polarization beam apparatus about about 1000 yuan); And very wide coupling passband (than the wide manyfold of various retes) is arranged, it is decided by the spectrum transmitting performance of prism material, can realize by tuning in the very wide wave-length coverage of near-infrared of near ultraviolet, visible light with general optical glass.And the coupling efficiency in each chamber can be controlled by the incidence angle of change prism or the method for other compensation.
In the time of need obtaining narrower laser line bandwidth, the beam-expanding system (Fig. 3) that then can adopt polygon prism to form, wherein prism (4
1), (6
1) be the coupling prism, prism (4
1) and (4
2), (6
1) and (6
2) form the biprism beam-expanding systems (also can be formed) in two chambeies respectively by more prism.Prism (10) then is a pre-prism beam expander, and it is each chamber total (being that prism expands bundle to each chamber in fact), and exports the laser of two tunable wave lengths through speculum (11) reflection by prism (10), also can be by prism (6
1) reflection output.In like manner, the tunable laser that also can form N the frequency in a N chamber.
The incidence angle α of above-mentioned coupling prism
i(i is a chamber sequence number, i=1, and 2 ... N) must be much larger than Brewster's angle α
b, α
i＞α
b+ 20 °, because α
i=α
bThe time, the p component of light all reflects, and not reflection makes with the coupling in next chamber and lost efficacy.
Implementation example: (pulse) tunable dye laser of double frequency output.
Pump light source can adopt the frequency doubled light of nitrogen molecular laser or yAG laser etc.
Laser dye: various laser dyes.
Prism beam expander: material is with ZF-5 or ZF-6 glass,
35 ° of prism vertex angles,
Prism hypotenuse width 45-60 millimeter,
85 °～88.5 ° of the incidence angles of prism.
Diffraction grating: can select the reflecting grating of every millimeter 600,1200 or 1800 lines for use,
The grating working width: 50～80 millimeters,
Grating is rotatable by sine mechanism.
Claims (2)
1, a kind of multi-frequency tunable laser of wide passband coupling, its each tunable laser chamber is by shared output reflector, the light prism beam expander in working-laser material (as dye cell etc.) and each chamber, grating is formed, and directly use reverberation and refract light beam splitting on the prism beam expander plane of incidence, to constitute the Michelson laser cavity of a double frequency running, it is characterized in that, utilize first prism beam expander in first chamber, both risen and expanded Shu Zuoyong, play the beam splitting effect again, its optics passband is only relevant with the spectrum transmitting performance of prism material, has wide passband characteristic.
2, the multi-frequency tunable laser of wide passband coupling according to claim 1, it is characterized in that carrying out twice smooth beam splitting, three tuning the chambeies that are coupled, promptly constitute the three compound Michelson chambeies of running frequently with first prism beam expander in first and second chambeies; Or carry out four tuning chambeies of three light beam splitting couplings, promptly constitute the four compound Michelson chambeies of running frequently, N tunable chamber (a corresponding N wavelength) is by the reverberation of first prism beam expander plane of incidence in a N-1 chamber and refract light beam splitting individual tuning the chamber of N that be coupled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86103373 CN1007483B (en) | 1986-05-15 | 1986-05-15 | Wide-band coupling multi-frequency tunable laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86103373 CN1007483B (en) | 1986-05-15 | 1986-05-15 | Wide-band coupling multi-frequency tunable laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86103373A CN86103373A (en) | 1987-11-25 |
| CN1007483B true CN1007483B (en) | 1990-04-04 |
Family
ID=4802051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86103373 Expired CN1007483B (en) | 1986-05-15 | 1986-05-15 | Wide-band coupling multi-frequency tunable laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007483B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332482C (en) * | 2004-10-11 | 2007-08-15 | 中国科学院电子学研究所 | Unstable laser cavity tunned by grating |
| DE102018209602B4 (en) * | 2018-06-14 | 2022-05-12 | Carl Zeiss Smt Gmbh | Optical assembly for reducing a spectral bandwidth of an output beam of a laser |
-
1986
- 1986-05-15 CN CN 86103373 patent/CN1007483B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN86103373A (en) | 1987-11-25 |
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| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |