CN1085015A - 1.3 μ m helium neon laser - Google Patents
1.3 μ m helium neon laser Download PDFInfo
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- CN1085015A CN1085015A CN 93111713 CN93111713A CN1085015A CN 1085015 A CN1085015 A CN 1085015A CN 93111713 CN93111713 CN 93111713 CN 93111713 A CN93111713 A CN 93111713A CN 1085015 A CN1085015 A CN 1085015A
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- laser
- gas laser
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- gas
- discharge tube
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- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 title abstract description 3
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 abstract description 10
- 230000003595 spectral effect Effects 0.000 abstract description 10
- 238000001228 spectrum Methods 0.000 abstract description 2
- 230000007704 transition Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 229910007880 ZrAl Inorganic materials 0.000 description 1
- DNXNYEBMOSARMM-UHFFFAOYSA-N alumane;zirconium Chemical compound [AlH3].[Zr] DNXNYEBMOSARMM-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- Lasers (AREA)
Abstract
1.3 μ m helium neon laser is a kind of near-infrared gas laser, is made of inflation pressure P and capillary interior diameter d product Pd=(15～70) torr mm in the discharge tube optical resonator and laser tube; He-Ne gas mixing ratio P
He: P
Ne=10: 1～40: 1; Two speculum bandwidth of resonant cavity are 1.15 μ m～1.52 μ m, and its medium wavelength is the transmission loss minimum at 1.3 μ m places, and other spectral line transmission losss are bigger.This laser has power and frequency stability is good, spectrum line width, the circular Gaussian beam angle of scattering is little, simple in structure and ratio of performance to price advantages of higher.
Description
The present invention is that a kind of new output wavelength is that the accurate wavelength of 1.3 μ m(is 1.2912 μ m) He-Ne (He-He) laser, belong to near-infrared gas laser technology field.
As far back as Ke Site people such as (Koster) in 1961 calculated theoretically neon (Ne) atomic energy level 2s to 2p have 40 kinds may transition probability, 2s wherein
5→ 2p
4The wavelength of transition spectral line is-1.29156 μ m, but transition probability is approximately zero (Koster.G.F.J Appl.phys.32.2054.1961) relatively; Now special 10 meters long resonant cavitys of human such as (Zitter) carried out spectral investigation in 1964, had obtained the Ne atom 2s → vibration of 2p multiline, wherein 2s
5→ 2p
4The vibration (Zitter.R.N.J.Appl.phys.35.3070.1964) that spectral line 1.2912 μ m are extremely faint; (Psge109 has listed 2s in Table4.3) to " gas laser introduction: population inversion mechanism " (Introduction to gas lasers Population inversion mechanisms) book of writing of Corinth (Colins.Willertt) in 1974
5→ 2p
4The transition wavelength measured value be 1.2912 μ m, be approximately zero but conclusion is the relative transition probability of 1.2912 these spectral lines of μ m, even realize laser generation, its intensity also extremely a little less than.Therefore, have no talent both at home and abroad over nearly 30 years this spectral line is further studied, more do not develop 1.3 μ m He-Ne lasers of practicability.
The objective of the invention is to remedy the deficiencies in the prior art, develop a kind of near-infrared gas laser of practicability, its centre wavelength is 1.2912 μ m, abbreviates 1.3 μ m He-Ne lasers as.
The present invention is made up of optical resonator and discharge tube, and its main points are the proportionings that suitably increase working gas total pressure and He-Ne thereof, and adopts special cavity mirror, product Pd=15～70 torr mm of inflation pressure P and capillary diameter d in the discharge tube; He-Ne gas mixing ratio P
He: P
Ne=10: 1～40: 1; Two speculum bandwidth of optical resonator are 1.15 μ m～1.52 μ m, and its medium wavelength is the transmission loss minimum at 1.3 μ m places, and the spectral line transmission loss that other may vibrate is bigger.Within bandwidth, the optimum transmission T2 of outgoing mirror is: the 1.3 μ m T of place
2%(resonant cavity long transmitance in=(1.5～4) is big), the T at 1.15 μ m places
2The T at 〉=50%, 1.26 μ m places
2=(3～8) %, the T at 1.52 μ m places
2〉=20%; The transmitance T of total reflective mirror
1For: the 1.3 μ m T of place
1=(0～0.1) %, the T at 1.15 μ m places
1The T at＞20%, 1.26 μ m places
1The T at 〉=1%, 1.52 μ m places
1〉=5%.In order to obtain pure and maximum 1.2912 μ m spectral line laser output, its preferred plan is Pd=40～50 torr mm, P
He: P
Ne=20: 1～28: 1.
Because 1.3 μ m are in telecommunication optical fiber zero chromatic dispersion, low-loss window, therefore the laser of 1.3 μ m not only is widely used in optical fiber communication and photoelectron technology field, and can be used as the narrow linewidth high stable single-frequency coherent source that the test and measuring standard is used.The present invention compares with solid state laser with the semiconductor laser of co-wavelength, has the following advantages: the one, can guarantee the power stability and the frequency stability of laser at ambient temperature; The 2nd, spectrum line width; The 3rd, be easy to obtain the output of fundamental transverse mode single longitudinal mode; The 4th, the circular Gaussian beam angle of divergence is little; The 5th, simple in structure, the dependable performance and the ratio of performance to price are high.
Fig. 1 is the structural representation of the embodiment of the invention.
The present invention can adopt the scheme of following examples to realize: the He-Ne gas laser of a kind of 1.3 μ m can adopt structure shown in Figure 1, the interior diameter d of discharge tube (5) desirable (1.2～2) mm, (for example getting 2mm), Pd desirable (20～55) torr mm in the pipe, (for example getting 50 torr mm), desirable 250～the 500mm(of cavity length is 500mm for example), operating current is less, desirable (1～5) mA, the best is for example 3mA of (1.5～3.5) mA(), total reflective mirror (2) radius of curvature R=500～1000mm(that adopts is 1000mm for example), (1) is the optical coupling adjuster, (4) are anode, (6) be quartzy shell, (7) be negative electrode, (8) are outgoing mirror, and ZrAl is the getter of zirconium aluminum system.Can get small signal gain coefficient G ° (
O)=(1.5～3) * 10
-3Cm
-1, the difference of energy level population up and down △ N=(2～5 of laser line) * 10
-9Cm
-3, full parameter Is=(10～15 of closing) and watt cm
-2, homogeneous broadening △
H=1000～1300MHz, dobla broadening △
D=743.8MHz, laser output fundamental transverse mode (TEM
00) single longitudinal mode power can reach (1～5) mw, spectral line width can be less than 50KHz.In the optimal parameter scope, form the homogeneous broadening line style, because the saturation effect of whole gain curve can obtain the single longitudinal mode output under the different cavity length.In order to increase the power output of laser, can choose chamber length and grow the outer-cavity structure of (for example getting 1 meter), and can outside discharge capillary, apply (50～100) Gauss's axial DC magnetic field.Because Zeeman (Zeeman) effect, 1.2912 μ m spectral lines produce division, the intersection point place of left-handed and dextrorotation two homogeneous broadening curves and near the light of generation vibration, can obtain exporting of 10mw by Bu Shi window (3) from the stabilized single-frequency linear polarization.The chamber is long to be can add piezoelectric ceramic (PZT) at resonant cavity one end by the laser of 250mm～500mm if choose, thereby makes 1.3 μ m frequency stabilized carbon dioxide lasers of band servo-control system.When the Pd of laser＜25 torr mm, the exportable multilongitudianl-mode laser of laser.In order under the condition that does not increase laser chamber length, to increase power output, can change laser works gas into isotope He by natural He-Ne
3-Ne
20, under the Pd value situation identical, make laser output power improve (30～50) % with proportioning numerical value.
Claims (8)
1, a kind of output wavelength is the He--Ne gas laser of 1.3 μ m, is made up of optical resonator and laser tube, it is characterized in that inflation pressure P and capillary interior diameter d product Pd=(15～70) torr mm in the discharge tube; He--Ne gas mixing ratio P
He: P
Ne=10: 1～40: 1; Two speculum bandwidth of optical resonator are 1.15 μ m～1.52 μ m, and its medium wavelength is the transmission loss minimum at 1.3 μ m places.
2, the He-Ne gas laser of 1.3 μ m according to claim 1 is characterized in that the optimum transmission T of outgoing mirror
2For: the 1.3 μ m T of place
2=(1.5～4) %, the 1.15 μ m T of place
2〉=50%, the 1.26 μ m T of place
2=(3～8) %, the 1.52 μ m T of place
2〉=20%; The transmitance T of total reflective mirror
1For: the 1.3 μ m T of place
1=(0～0.1) %, the T at 1.15 μ m places
1＞20%, the 1.26 μ m T of place
1The T at 〉=1%, 1.52 μ m places
1〉=5%.
3, the He-Ne gas laser of 1.3 μ m according to claim 1 is characterized in that preferred plan is Pd=40～55 torr mm, P
He: P
Ne=20: 1～28: 1.
4, according to the He-Ne gas laser of claim 1.2 or 3 described 1.3 μ m, the working gas that it is characterized in that discharge tube is isotope He
3-Ne
20
5, according to the He-Ne gas laser of claim 1.2 or 3 described 1.3 μ m, it is characterized in that the diameter d of discharge tube is (1.2～2) mm, cavity length is 250～500mm, total reflective mirror radius of curvature R=500～1000mm.
6,, it is characterized in that the laser works electric current is I=(1～5 according to the He-Ne gas laser of claim 1.2 or 3 described 1.3 μ m) mA, its best is (1.5～3.5) mA.
7,, it is characterized in that resonant cavity for chamber length is 1 meter outer-cavity structure, applies (50～100) Gauss's axial DC magnetic field at the discharge tube extracapillary according to the He-Ne gas laser of claim 1.2 or 3 described 1.3 μ m.
8,, it is characterized in that the Pd value that obtains many longitudinal mode outputs is (15～25) torr mm according to the He-Ne gas laser of claim 1.2 or 3 described 1.3 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93111713 CN1034375C (en) | 1993-08-23 | 1993-08-23 | 1.3 micrometer helium neon laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93111713 CN1034375C (en) | 1993-08-23 | 1993-08-23 | 1.3 micrometer helium neon laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085015A true CN1085015A (en) | 1994-04-06 |
| CN1034375C CN1034375C (en) | 1997-03-26 |
Family
ID=4989475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93111713 Expired - Fee Related CN1034375C (en) | 1993-08-23 | 1993-08-23 | 1.3 micrometer helium neon laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1034375C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709795A (en) * | 2012-06-13 | 2012-10-03 | 清华大学 | Helium-neon gas laser with built-in cavity |
-
1993
- 1993-08-23 CN CN 93111713 patent/CN1034375C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709795A (en) * | 2012-06-13 | 2012-10-03 | 清华大学 | Helium-neon gas laser with built-in cavity |
| CN102709795B (en) * | 2012-06-13 | 2013-06-12 | 清华大学 | Helium-neon gas laser with built-in cavity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034375C (en) | 1997-03-26 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |