CN85100730B - Short cavity-length longitudinal zeeman he-ne double frequency laser - Google Patents
Short cavity-length longitudinal zeeman he-ne double frequency laser Download PDFInfo
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- CN85100730B CN85100730B CN85100730A CN85100730A CN85100730B CN 85100730 B CN85100730 B CN 85100730B CN 85100730 A CN85100730 A CN 85100730A CN 85100730 A CN85100730 A CN 85100730A CN 85100730 B CN85100730 B CN 85100730B
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- frequency
- laser
- signal
- heating power
- hot wire
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- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000011521 glass Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 3
- 238000005485 electric heating Methods 0.000 abstract 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 206010021703 Indifference Diseases 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
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Abstract
The present invention adopts a He-Ne laser with a short inner cavity as a main body and adopts temperature control to stabilize frequency. An electric heater with a hot temperature control wire uses double electric heating wires wound on a tube casing; the electric heating wires are divided into two sections; one section is used for quick adjustment, and the other section is used for large stroke adjustment. The on-off of the electric heating wires is controlled by a frequency maladjustment rate signal and an additional AC signal. Thus, the overshooting in the process of temperature control is suppressed, and the influence of noise in the frequency maladjustment rate signal is averaged. The frequency misalignment rate can be controlled to delta ro/ro<=3*10+(-9). The present invention has the advantages of free electrical interference, high vibration resistance, high stability, long service life, easy commercialization, etc. The price is only from 1/10 to 1/5 of that of the existing double-frequency laser.
Description
The invention belongs to a kind of laser, general short cavity He-Ne two-frequency laser, frequency stabilization is to realize by the electric current in the heater coil of control on the laser tube shell, as the GB1448676 in the prior art, its shortcoming is: have the contradiction between quick adjustment and the big tuning amount in this kind laser; In addition, the even item in the tuning curve moves the balance point generation.
The present invention is directed to above shortcoming improves.
Accompanying drawing 1 is a kind of short cavity-length longitudinal zeeman He-Ne double frequency laser schematic diagram, (1) is the end hot wire heater among the figure, (2) be the middle part hot wire heater, (3) be electronic switch, (4) be capacitor, (5) are additional AC signal, and (6) are frequency misalignment amount signal, (7) be short intracavity laser, (8) are annular magnet.
Accompanying drawing 2 is average heating powers that electric heater obtains.
Accompanying drawing 3 is to implement illustration.
The main points of short cavity-length longitudinal zeeman He-Ne double frequency laser are: two two-wires and hot wire heater (1) and (2) on the glass bulb laser tube shell are arranged, (1) is positioned at the end of laser tube (7), and outside magnet, resistance is less, be responsible for quick tuning amount, (2) be positioned at the middle part of laser tube and among magnet, resistance is bigger, is responsible for big at a slow speed tuning amount; The stable of frequency realize by the power of controlling among the hot wire heater, promptly becomes the odd functional relation between the heating power in the heated filament electric heater and the frequency misalignment amount signal; Hot wire heater's control is controlled by electronic switch (3); Electronic switch (3) is by frequency misalignment amount signal (6) and the common control of additional AC signal (5); Relation between hot wire heater's power and the frequency misalignment amount changes by following rule: work as v=v
0+ △ v
0The time, heating power is a constant P
0; V=v
0-△ v
0The time, heating power is zero, when v at v
0± △ v
0Between the time, heating power increases with v, when v at v
0When neighbouring, heating power and v are linear.
Operation principle: frequency misalignment amount signal (6) is controlled electronic switch (3) jointly with additional AC signal (5).(6) and the synthetic signal of (5) be timing, switch conduction (or closing), when synthetic signal when negative, switch cuts out (or conducting), thus in the one-period of additional signal, the average heating power that electric heater obtains has promptly obtained the odd functional relation between frequency misalignment amount and the heating power as shown in Figure 2.End hot wire heater (1) two-wire and around the end of laser tube, littler than middle part hot wire heater's (2) heating resistor, and be exposed to outside the magnet, heat is dispersed easily, thereby responsible quick adjustment.Middle part electric heater (2) two-wire and around laser tube middle part closes within magnet (8), has bigger resistance, can be responsible for big frequency regulating amount.
Because the odd functional relation between heater power and the frequency misalignment amount is so self-locking of laser frequency is at (v
0-△ v
0) and (v
0+ △ v
0) between.Because heating power is at (v
0-△ v
0) and (v
0+ △ v
0) between gradual change relation, suppressed the overshoot of the frequency that causes owing to thermal inertia in the temperature control process.Because at v
0Linear relationship between near heating power and the frequency misalignment amount, and because big thermal inertia, thereby the average influence of the flucturation noise in the frequency misalignment amount signal (6) has guaranteed that frequency stabilization system has high closed loop gain, and be similar to the indifference regulating system, just guaranteed △ v
0+ v
0Value reach 3 * 10
-9In, this laser chamber is long not to be subjected to extraneous electrical interference, and can also resist comparatively strong mechanical oscillation, and the life-span is long.Processing technology is simple, and low price is 10%～20% of a present domestic and international market price, and the easy manufacturing technology index of this laser guarantees easily, and commercialization has easily so just improved economic benefit greatly.
Accompanying drawing 3 is one embodiment of the invention, and its medial end portions hot wire heater's (1) resistance is 20 Ω, and middle part hot wire heater's (2) resistance is 50 Ω, and the heater strip total length is 3.5M, and diameter is 0.5mm, surface insulation.As for two-wire and around measure, the realization of electronic switch (3), frequency misalignment signal (6) all is a prior art with the generation of additional AC signal (5).
The method of this kind temperature control frequency stabilization can also be used to stablizing the frequency of other laser, for example stablizes the frequency of the commercial inner chamber He-Ne of 250mm laser.
Claims (6)
1, a kind of short cavity-length longitudinal zeeman He-Ne double frequency laser includes two-wire and around hot wire heater, frequency misalignment amount signal, additional AC signal, electronic switch, it is characterized in that:
1. two-wire and the hot wire heater on glass bulb laser tube shell divide two sections (1) and (2), (1) is positioned at the end of laser tube (7), and outside magnet, resistance is less, be responsible for quick tuning amount, (2) are positioned at the middle part of laser tube, and among magnet, resistance is bigger, is responsible for big at a slow speed tuning amount.
2. the stable of frequency realized by the power of controlling among the hot wire heater, promptly becomes the odd functional relation between the heating power in the heated filament electric heater and the frequency misalignment amount signal.
2, according to the described two-frequency laser of claim 1, it is characterized in that: said hot wire heater's control is to be controlled by electronic switch (3).
3, according to the described two-frequency laser of claim 2, it is characterized in that: said electronic switch (3) is by frequency misalignment amount signal (6) and the common control of additional AC signal (5).
4, according to the described two-frequency laser of claim 1, it is characterized in that: the relation between said hot wire heater's power and the frequency misalignment amount, change by following rule, work as v=v
0+ △ v
0The time, heating power is a constant P
0; V=v
0-△ v
0The time, heating power is zero, when v at v
0± △ v
0Between the time, heating power increases with v, when v at v
0When neighbouring, heating power and v are linear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100730A CN85100730B (en) | 1985-04-01 | 1985-04-01 | Short cavity-length longitudinal zeeman he-ne double frequency laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100730A CN85100730B (en) | 1985-04-01 | 1985-04-01 | Short cavity-length longitudinal zeeman he-ne double frequency laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100730A CN85100730A (en) | 1986-07-02 |
| CN85100730B true CN85100730B (en) | 1986-07-02 |
Family
ID=4791395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100730A Expired CN85100730B (en) | 1985-04-01 | 1985-04-01 | Short cavity-length longitudinal zeeman he-ne double frequency laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100730B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832533A (en) * | 2011-06-17 | 2012-12-19 | 上海微电子装备有限公司 | Device for increasing frequency difference of Zeeman double-frequency laser |
-
1985
- 1985-04-01 CN CN85100730A patent/CN85100730B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832533A (en) * | 2011-06-17 | 2012-12-19 | 上海微电子装备有限公司 | Device for increasing frequency difference of Zeeman double-frequency laser |
| CN102832533B (en) * | 2011-06-17 | 2014-05-21 | 上海微电子装备有限公司 | Device for increasing frequency difference of Zeeman double-frequency laser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100730A (en) | 1986-07-02 |
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