CN1034375C - 1.3 micrometer helium neon laser - Google Patents
1.3 micrometer helium neon laser Download PDFInfo
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- CN1034375C CN1034375C CN 93111713 CN93111713A CN1034375C CN 1034375 C CN1034375 C CN 1034375C CN 93111713 CN93111713 CN 93111713 CN 93111713 A CN93111713 A CN 93111713A CN 1034375 C CN1034375 C CN 1034375C
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- laser
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- gas
- discharge tube
- gas laser
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Abstract
The present invention relates to a 1.3 mu m of helium-neon laser which is a near infrared gas laser. The present invention is composed of an optical resonant cavity and a laser tube. A product of inflation pressure intensity P and the inside diameter d of a capillary tube Pd=(15-70) torr. Mm; the proportioning of helium-neon gas is P<He>: P<Ne>=10: 1 to 40: 1; the bandwidth of two reflectors of the resonant cavity is in a scope ranging from 1.15 mu m to 1.52 mu m, wherein transmission loss of which the wavelength is 1.3 mu m is minimal, and the transmission loss of other spectral lines is relatively large. The laser device has the advantages of good stability of power and frequencies, wide and narrow spectral lines, small scattering angles of circular gaussian beams, simple structure, high cost performance, etc.
Description
The present invention is that a kind of new output wavelength is He-Ne (He-He) laser of 1.3 μ m (accurately wavelength is 1.2912 μ m), belongs 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, wherein the wavelength of 2s5 → 2p4 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, obtained Ne atom 2s → 2p multiline vibration, the wherein extremely faint vibration (Zitter.R.N.J.Appl.phys.35.3070.1964) of 2s5 → 2p4 spectral line 1.2912 μ m; " gas laser introduction: population inversion mechanism " (In-troduction to gas lasers Population inversion mechanisms) book (Psge109 of writing of Corinth (Colics.Willertt) in 1974, Table4.3) 30 spectral lines and corresponding energy level, wherein 2s that 2s → 2p may realize laser transition have been listed in
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 mHe-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 mHe-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=(1.5～4) % (the long transmitance of resonant cavity 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 (for example 500mm), operating current is less, desirable (1～5) mA, the best is (1.5～3.5) mA (for example 3mA), total reflective mirror (2) radius of curvature R=500～1000mm (for example 1000mm) that adopts, (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 ° (V
0)=(1.5～3) * 10
-3Cm
-1, the difference of the energy level population up and down Δ N=(2～5) * 10 of laser line
-9Cm
-3, full parameter Is=(10～15) watt cm that closes
-2, homogeneous broadening Δ V
H=1000～130MHz, dobla broadening Δ V
D=743.8MHz, laser output fundamental transverse mode (TEM
Oo) 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 (5)
1. the He-Ne gas laser that output wavelength is 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=(40～55) torr in the discharge tube; He-Ne gas mixing ratio P
He: P
Ne=20: 1～28: 1; The diameter d of discharge tube is (1.2～2) mm, and cavity length is 250～500mm, total reflective mirror radius of curvature R=500～1000mm; The optimum transmission T of the outgoing mirror of optical resonator
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) %; 1.15 the μ m T of place
1＞20%, the 1.26 μ m T of place
1〉=1%, the 1.52 μ m T of place
1〉=5%.
2. the He-Ne gas laser of 1.3 μ m according to claim 1, the working gas that it is characterized in that discharge tube is with bit table He
3--Ne
20
3. the He-Ne gas laser of 1.3 μ m according to claim 1 is characterized in that the laser works electric current is I=(1～5) mA, and the best is (1.5～3.5) mA.
4. the He-Ne gas laser of 1.3 μ m according to claim 1 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.
5. the He-Ne gas laser of 1.3 μ m according to claim 1 is characterized in that the Pd value that obtains many longitudinal mode outputs is (15～25) torr mm.
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 CN1085015A (en) | 1994-04-06 |
| CN1034375C true 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709795B (en) * | 2012-06-13 | 2013-06-12 | 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
Also Published As
| Publication number | Publication date |
|---|---|
| CN1085015A (en) | 1994-04-06 |
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