CN1095548C - Active rubidium atom resonance light filter - Google Patents
Active rubidium atom resonance light filter Download PDFInfo
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- CN1095548C CN1095548C CN99124952A CN99124952A CN1095548C CN 1095548 C CN1095548 C CN 1095548C CN 99124952 A CN99124952 A CN 99124952A CN 99124952 A CN99124952 A CN 99124952A CN 1095548 C CN1095548 C CN 1095548C
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- rubidium
- bulb
- furnace
- heating furnace
- electrodeless
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- 229910052701 rubidium Inorganic materials 0.000 title claims abstract description 24
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical group [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000001228 spectrum Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 17
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 11
- 238000005485 electric heating Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 239000005304 optical glass Substances 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 14
- 238000004891 communication Methods 0.000 abstract description 12
- 238000001914 filtration Methods 0.000 abstract description 4
- 238000002834 transmittance Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 6
- 230000003595 spectral effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000005281 excited state Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000005283 ground state Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910052716 thallium Inorganic materials 0.000 description 2
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001006 Constantan Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The present invention discloses an active rubidium atom resonance optical filter which relates to optics, radioelectronics and atomic and molecular physics. The active rubidium atom resonance optical filter is particularly suitable for optical filtration devices in the field of laser communication. In order to provide a rubidium atom resonance optical filter (Rb-ARF) which is highly effective and applicable, the present invention is mainly composed of an electrodeless discharge Rb spectrum lamp and atomic steam bubbles, and H2 and CO with proper pressure are added in the steam bubbles. Because the active rubidium atom resonance optical filter has the advantages of simple structure, small volume, light weight, narrow band and very high light transmittance, the present invention has wide application prospects.
Description
The invention discloses an active rubidium atom resonance filter (rubidium-Rb, atom resonance filter-ARF), which relates to optics, radio electronics and atom and molecule physics, and is particularly suitable for a filter device in laser communication.
The optical filter device is widely applied to laser communication, and the prior art is as follows:
the traditional optical filter cannot meet the requirement of working in the daytime of laser communication due to wide bandwidth and low transmittance.
Secondly, the researched and demonstrated Rb-ARF uses a dye laser or a semiconductor laser as a pumping source for exciting Rb ground state atoms to a 5P excited state and has no practicability; secondly, the pure Rb sample is used, so the conversion efficiency is lower. Dye laser or semiconductor laser pumped fluorescent active Rb-ARF, although having very high pumping efficiency, is bulky and suitable only for determination of physical parameters and study of atomic filtering characteristics in a laboratory. The latter has problems in that: a. semiconductor laser products with proper Rb wavelength are not available at home and need to be purchased from foreign countries; b. the laser wavelength stability is poor and not practical (this has been proved in atomic frequency standard, so far, the atomic frequency standard of laser pump still can not reach the practical stage).
③ fluorescent active thallium ARF for habitation 62P3/2Atomic metastability is also pumped using spectral lamps, but its operating wavelength is not the same as Rb-ARF, and cannot directly replace Rb-ARF, and thallium vapor bubbles can only maintain a very low atomic number density in order to satisfy the conditions for generating atomic metastability, and therefore, the output signal intensity is limited.
Therefore, the laser optical communication system can only work at night by using the traditional optical filter. To ensure that laser optical communication can be performed during the day, it is required to use a filter device with higher efficiency. Compared with interference filters (thin-film, polarizing, etc.) and birefringent filters, ARF has the characteristics of large acceptance angle, narrower bandwidth, and higher filtering efficiency. Although the current Rb-ARF enables the laser optical communication system to work normally in the daytime, the traditional design scheme for directly using the laser communication still has the problems of large and impractical devices or low conversion efficiency and the like because no commercial devices meeting the requirements are available.
The invention aims to overcome the problems and the defects in the prior art and research and build an active, efficient and practical Rb-ARF.
The purpose of the invention is realized as follows:
the invention uses the Rb-ARF pumped by the electrodeless discharge Rb spectrum lamp. The use of Rb spectral lamps in the Rb atomic frequency standard has shown its utility: high spectral purity, stable radiation frequency, small volume, long service life, and easy combination with other components. For Rb vapor bubbles, we designed a bulk size of Φ 18 × 40mm with a Φ 5 × 50mm bubble tail, which guarantees a Rb vapor quantum conversion efficiency of 28%. The wavelength and frequency doubling Nd: the laser wavelengths of YAG lasers (the operating temperature of a YAG crystal bar is 102 ℃) are matched, and the matching of the YAG lasers and the YAG crystal bar is one of the alternatives of laser-to-latent communication. The invention mainly comprises an electrodeless discharge Rb spectrum lamp and an atomic vapor bubble, and the working principle is as follows: firstly, let the Rb spectrum lamp Rb D discharge electrodeless1Or D2Irradiating Rb vapor bubble with linear light to make Rb atoms concentrated at 52P1/2Or 52P3/2The excited state, Rb-ARF is in working state. When an incident signal matched with the high excited state energy level spectral line of the Rb atom passes through the Rb vapor bubble, the Rb atom absorbs a signal photon and then jumps from a 5P energy level to a high excited S or D state, then the excited state Rb atom radiatively relaxes through an nP state to return to a ground state, and all information of the signal is contained in output atomic fluorescence through internal conversion of the atom. High transmittance is generated in an extremely narrow atomic line width, and high inhibition is generated on strong background noise. Transition from the 5P level to a highly excited S-state or D-state, of particular interest being an operating wavelength of 532nm (5P)1/2-10S1/2) With a response time on the order of hundreds of ns, the theoretical pure Rb atomic vapor bubble has a long working life. Together with the design of the dual oven, the atomic number density of the Rb vapor bubble can be made constant during operation. To improve the detection sensitivity of Rb-ARF, we used Rb vapour plus molecular gas (H)2Or CO).
The invention has the advantages or positive effects that:
the laser optical communication system can normally work in the daytime due to the ultra-narrow linewidth filtering characteristic.
Secondly, an electrodeless discharge Rb spectrum lamp is used as a pumping source, so that the volume and the weight of the device are reduced, the structure of the device is simplified, and the invention has practicability; ② in Atomic Resonance Filter (ARF) studies, undoped samples are generally used. On the basis of researching the collision energy transfer between atoms and molecules, proper pressure H is added to bubbles2CO gas, so that the invention is 7 ℃ at the preset working temperature (130℃)2P52S1/2Fluorescence intensity was enhanced by 6 (using H) compared to using pure Rb bubbles, respectively2Gas) and 20 times (using CO gas), the detection sensitivity of the ARF is greatly improved; therefore, the distance of laser optical communication can be increased, or the seawater depth of laser-to-submarine communication can be increased.
The following detailed description is made in conjunction with the accompanying drawings and examples:
fig. 1 is a working principle diagram of the present invention. Wherein,
1-circuit box, namely electrodeless discharge Rb spectral lamp excitation circuit box, including semiconductor high frequency (98MHz) oscillating circuit and heat sink, its function is to guarantee the Rb bulb to start the luminance normally and work stably;
2-the heat-insulating sleeve is made of polytetrafluoroethylene plastic, so that the working temperature of the Rb bulb is prevented from fluctuating along with the ambient temperature;
a 3-red light band-pass filter which only allows 780mm and 794nm radiation light of the electrodeless discharge Rb spectrum lamp to pass through;
4-an electric heating wire which is not provided with magnetic double winding and converts electric energy provided by an external direct current power supply into heat energy to heat the Rb steam bubble, so that the Rb steam bubble wall is ensured not to be adhered with Rb metal;
5-interference filter, whose band-pass wavelength signal laser wavelength is matched;
6-optical glazing, which acts to maintain the temperature inside the furnace, prevent hot air from affecting the performance of the interference filter, and allow the passage of pumping light, signal laser and atomic fluorescence with as little loss as possible;
7-the heating furnace is made of polytetrafluoroethylene plastics, is internally provided with an electric heating wire and a platinum wire resistor for controlling temperature and measuring temperature, and can ensure that the heating furnace works at any temperature between room temperature and 180 ℃ and the stability is +/-0.3 ℃;
the 8-electrodeless Rb bulb comprises several mgRb metal and inert gas, and the vacuum degree before packaging is better than 10-5Torr；
9-oscillating coil, one part of the excitation circuit of the electrodeless discharge Rb spectrum lamp, is made of phi 2mm silver wire;
10-small furnace, the thermal insulation sleeve is made of polytetrafluoroethylene plastics, and is internally provided with an electric heating wire and a platinum wire resistor for controlling temperature and measuring temperature, and the platinum wire resistor is used for controlling the density of Rb steam and ensuring that the Rb steam in the Rb steam bubble is constant at a required atomic number density in work;
11-Rb steam bubble, made of 95 glass, is the core of Rb-ARF, comprises Rb metal and molecular gas as working medium, in the work, Rb atom steam is formed by heating, the vacuum degree in the steam bubble before filling the Rb metal and the molecular gas is better than 10-5Torr；
12-an electric heating wire, a constantan wire material and no magnetic double winding, which provides a heat source for the small furnace 10;
and the 13-blue light band-pass filter selects the atomic fluorescence converted by the signal light to pass through and is matched with the working wavelength range (420nm-311nm) of the atomic fluorescence.
As can be seen from fig. 1, the present invention is mainly composed of an electrodeless Rb bulb 8 and an Rb vapor bulb 11. The circuit box 1, the heat insulation sleeve 2, the electrodeless Rb bulb 8 and the oscillating coil 9 form an electrodeless discharge Rb spectrum lamp device. The circuit box 1 includes a high-frequency oscillation circuit and a heat sink portion; the insulating sleeve 2 is fixed on the circuit box 1, and the oscillating coil 9 is a part of the oscillating circuit and is also fixed on the circuit box; the oscillating coil 9 is positioned in the heat-insulating sleeve 2; the electrodeless discharge Rb bulb 8 is placed in the middle of the oscillating coil 9, the outer wall of the electrodeless discharge Rb bulb is not contacted with the oscillating coil 9, and only the bulb tail is fixed on the rear wall of the heat insulation sleeve 2; the front part of the heat insulation sleeve 2 is provided with a red light band-pass filter 3 and is connected with a heating furnace 7; each port of the heating furnace 7 is mounted with an optical glass sheet 6 for preventing the temperature of the heating furnace 7 from affecting the performance of the optical filters 3, 5 and 13 and ensuring that light passes through with as little loss as possible; the interference filter 5 is fixed on the heating furnace 7, the center wavelength of the band-pass is matched with the incident signal laser, the light of other wavelengths is inhibited, and the incident signal laser is vertical to the pump light; the heating furnace 7 comprises an electric heating wire 4 and a platinum resistor (not shown) for measuring and controlling temperature, which ensure that the furnace works at any determined temperature within the range of room temperature to 180 ℃, and the temperature control precision is +/-0.3 ℃; the small furnace 10 is mounted on the heating furnace 7 in an embedded manner, and the furnace also comprises an independent electric heating wire 12 and a platinum resistor (not shown) for measuring and controlling temperature; in operation, the small furnace 10 is maintained at a temperature 10 ℃ lower than the temperature of the heating furnace 7; the Rb steam bubble 11 is fixed at the top end of the small furnace 12, the main body part of the Rb steam bubble 11 is positioned in the heating furnace 7, and no Rb metal is adhered to the wall of the Rb steam bubble 11 during operation; the tail of the Rb steam bubble 11 is positioned in the small furnace 10, and the tail contains about dozens of mg of Rb metal, so that the Rb steam bubble has enough long service life.
From the analysis, the invention has wide application prospect due to high cost performance, high efficiency and practicability.
Claims (2)
1. An active rubidium atom resonance filter is characterized by mainly comprising an electrodeless rubidium bulb (8) and a rubidium steam bulb (11), and the connection relation is as follows:
a circuit box (1), a heat insulation sleeve (2), the electrodeless rubidium bulb (8) and an oscillating coil (9) form an electrodeless discharge rubidium spectrum lamp device; the circuit box (1) comprises a high-frequency oscillation circuit and a heat sink part; the heat insulation sleeve (2) is fixed on the circuit box (1), and the oscillating ring (9) is a part of an oscillating circuit and is also fixed on the circuit box (1); the oscillating coil (9) is positioned in the heat-insulating sleeve (2); the rubidium electrodeless bulb (8) is placed in the middle of the oscillating coil (9), the outer wall of the rubidium electrodeless bulb is not in contact with the oscillating coil (9), and only the bulb tail is fixed on the rear wall of the heat insulation sleeve (2); the front part of the heat insulation sleeve (2) is provided with a red light band-pass filter (3) and is connected with a heating furnace (7); each port of the heating furnace (7) is provided with an optical glass sheet (6); the interference filter (5) is fixed on the heating furnace (7), the center wavelength of the band-pass of the interference filter is matched with the incident signal laser, and the light of other wavelengths is inhibited, so that the incident signal laser and the pump light are vertical to each other;
the heating furnace (7) internally comprises a first electric heating wire (4) and a platinum resistor for measuring and controlling temperature; the small furnace (10) is mounted on the heating furnace (7) in an embedded manner, and the furnace also comprises an independent second electric heating wire (12) and a platinum resistor for measuring and controlling temperature; the rubidium steam bubble (11) is fixed at the top end of the small furnace (10), and the main body part of the rubidium steam bubble (11) is positioned in the heating furnace (7); the tail part of the rubidium steam bubble (11) is positioned in the small furnace (10), and the tail part contains about dozens of milligrams of rubidium metal.
2. A primary rubidium atom resonance filter as claimed in claim 1, wherein said rubidium vapor bubble (11) is filled with H under suitable pressure2And CO gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99124952A CN1095548C (en) | 1999-12-30 | 1999-12-30 | Active rubidium atom resonance light filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99124952A CN1095548C (en) | 1999-12-30 | 1999-12-30 | Active rubidium atom resonance light filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1301972A CN1301972A (en) | 2001-07-04 |
| CN1095548C true CN1095548C (en) | 2002-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99124952A Expired - Fee Related CN1095548C (en) | 1999-12-30 | 1999-12-30 | Active rubidium atom resonance light filter |
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| Country | Link |
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| CN (1) | CN1095548C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101241241B (en) * | 2008-02-03 | 2010-06-09 | 中国科学院武汉物理与数学研究所 | Raman optical amplification atom filtering method and apparatus |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295896C (en) * | 2003-11-11 | 2007-01-17 | 中国科学院武汉物理与数学研究所 | Space quantum communication unit using atom light filter |
| JP5540619B2 (en) * | 2009-09-16 | 2014-07-02 | セイコーエプソン株式会社 | Control method of atomic oscillator |
| JP5679099B2 (en) * | 2010-03-02 | 2015-03-04 | セイコーエプソン株式会社 | Atomic oscillator |
| CN102386556B (en) * | 2011-09-22 | 2013-08-07 | 北京大学 | Atomic excitation state anomalous dispersion atomic filter and method for filtering signal light |
| CN102545004A (en) * | 2012-02-22 | 2012-07-04 | 北京大学 | Anomalous dispersion light filter of 1.5-micron wave band and method for filtering signals |
| CN103701030B (en) * | 2014-01-06 | 2016-01-13 | 北京大学 | A kind of unimodal for laser frequency stabilization 87rb isotope atom filter and filtering method thereof |
-
1999
- 1999-12-30 CN CN99124952A patent/CN1095548C/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 北京大学学报(自然科学报)第35卷第5期 1999.9.1 张量等 新弄铷原子滤光器斯塔史频移研究 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101241241B (en) * | 2008-02-03 | 2010-06-09 | 中国科学院武汉物理与数学研究所 | Raman optical amplification atom filtering method and apparatus |
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| Publication number | Publication date |
|---|---|
| CN1301972A (en) | 2001-07-04 |
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