CN110006633A - A kind of device reducing laser phase frequency noise testing fibre optic interferometer thermal noise - Google Patents
A kind of device reducing laser phase frequency noise testing fibre optic interferometer thermal noise Download PDFInfo
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- CN110006633A CN110006633A CN201910287830.XA CN201910287830A CN110006633A CN 110006633 A CN110006633 A CN 110006633A CN 201910287830 A CN201910287830 A CN 201910287830A CN 110006633 A CN110006633 A CN 110006633A
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- shell
- fibre
- fibre optic
- optic interferometer
- optic
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- 239000000835 fiber Substances 0.000 title claims abstract description 63
- 238000012360 testing method Methods 0.000 title claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000001307 helium Substances 0.000 claims description 7
- 229910052734 helium Inorganic materials 0.000 claims description 7
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000005538 encapsulation Methods 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 description 5
- 230000005622 photoelectricity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
- G01J2009/0226—Fibres
Abstract
The present invention discloses a kind of device for reducing laser phase frequency noise testing fibre optic interferometer thermal noise, including fibre optic interferometer module, temperature sensor and shell；The fibre optic interferometer module includes optic fibre light path, photodetection road and package casing, the optic fibre light path and photodetector constitute fibre optic interferometer, optic fibre light path and photodetector are packaged in its shell by the package casing, the inner surface of the fibre optic interferometer module is glued with temperature sensor, the temperature sensor is located at package casing case inside, input optical fibre and several groups signal output cable are provided on the package casing, optical signal is input in the intracorporal optic fibre light path structure of package casing shell by the input optical fibre.The invention enables entire fibre optic interferometers to work under subzero 100 degrees Celsius of low-temperature conditions below, to fundamentally reduce interferometer thermal noise.
Description
Technical field
The invention belongs to the technical fields of laser, and in particular to a kind of reduction laser phase frequency noise testing fiber optic interferometric
The device of instrument thermal noise.
Background technique
The noise characteristics parameter such as the phase frequency noise of laser and its line width be low noise, narrow linewidth laser research and development, production,
The physical quantity for needing to pay close attention in application process carries out accurately characterization test to it and is always one very crucial to ask
Topic.
In order to solve this problem, the researcher of Shanghai Optics and Precision Mechanics institute, Chinese Academy of Sciences proposes based on 3
The measuring technology of difference interference and the power spectral density estimation of × 3 couplers, for example " laser noise is special for Chinese invention patent
The measuring device (ZL201110172609.3) of property " (prior art).The core of this method is to propose to utilize 3 × 3 couplers
120 degree of the three tunnel difference fibre optic interferometer formed avoids 2 × 2 conventional couplers in this way by increasing interference fringe all the way
The interference fading problem that interferometer occurs, so that all at least two groups of interference fringes carry phase noise information to any time, from
And steady phase frequency noise and line width test can be realized at any time.In order to reduce external environment as far as possible to interferometer state
Influence, the prior art propose utilizes the sound-absorbings heat-absorbing material such as metal-back, polyester film, thermoplastic polymer realize
The encapsulation of sound-insulating and heat-insulating.Although such encapsulate the influence for largely reducing external environment, for interferometer sheet
The thermal noise of body does not have inhibitory effect.
And in order to obtain the measurement performance of the limit as far as possible, the present invention devises the liquid that fibre optic interferometer is placed in specific structure
Method and structure in nitrogen or liquid helium environment makes entire interferometer be in the working environment of extremely low temperature, to fundamentally drop
Its low thermal noise, or obtain lower sample-out count noise.
Summary of the invention
Goal of the invention: present invention aims in view of the deficiencies of the prior art, provide a kind of reduction laser phase frequency noise survey
The device of fibre optic interferometer thermal noise on probation, the present invention devise the liquid nitrogen or liquid nitrogen ring that fibre optic interferometer is placed in specific structure
Method and structure in border makes entire fibre optic interferometer be in the working environment of extremely low temperature, makes an uproar to fundamentally reduce its heat
Sound obtains lower sample-out count noise.
Technical solution: a kind of device reducing laser phase frequency noise testing fibre optic interferometer thermal noise of the present invention,
Including fibre optic interferometer module, temperature sensor and shell；The fibre optic interferometer module includes optic fibre light path, photodetection
Road and package casing, the optic fibre light path and photodetector constitute fibre optic interferometer, the package casing by optic fibre light path and
Photodetector is packaged in its shell, and the inner surface of the fibre optic interferometer module is glued with temperature sensor, the temperature
Sensor is located at package casing case inside, and input optical fibre and several groups signal output cable are provided on the package casing,
Optical signal is input in the intracorporal optic fibre light path structure of package casing shell by the input optical fibre, and the output cable visits photoelectricity
The output signal for surveying electric signal and temperature sensor that device is converted to is exported to package casing；
The shell includes shell inner cavity, shell lumen, shell exocoel and three layers of shell shell wall, and the shell inner cavity is located at shell
Medium position is provided with shell shell wall, between the shell lumen and shell exocoel between the shell lumen and shell inner cavity
It is provided with shell shell wall, is provided with shell shell wall on the outside of the shell exocoel, the fibre optic interferometer module is fixed in shell
Intracavitary, the shell lumen places liquid nitrogen or liquid helium, the shell exocoel are evacuated.
Preferably, it is provided with aperture on the shell, the aperture is by input optical fibre in fibre optic interferometer module and defeated
Cable introduces on the outside of case body out, and the perforation channels are sealed, and the shell wall of the shell is by aluminium alloy or stainless steel
It forms.
Preferably, the size of the aperture is arranged according to the thickness of input optical fibre and output cable, places in the aperture
Sealing is filled by gastight adhesive after input optical fibre and output cable.
Preferably, the package casing uses plastic material or metal material, and size is visited according to optic fibre light path and photoelectricity
The specification size for surveying device is configured.
Preferably, the output cable is 4 output cables, and the output cable uses normal signal line or coaxial electrical
Cable.
The utility model has the advantages that (1) present invention is by the design of shell, fibre optic interferometer module is fixed in shell inner cavity, described
Shell lumen places liquid nitrogen or liquid helium, shell exocoel are evacuated, and the shell in this structure makes fibre optic interferometer module be in zero
In lower 100 degrees Celsius of working environments below, to fundamentally reduce the thermal noise of fibre optic interferometer, it can be used for testing
Gravitational wave detection light source etc. requires laser noise high occasion.
Detailed description of the invention
Fig. 1 is the structural block diagram of device of the present invention.
Wherein, 1- fibre optic interferometer module；2- photodetector；3- optic fibre light path；4- temperature sensor；5- liquid nitrogen；6-
Shell；61- shell lumen；62- shell exocoel；63- shell inner cavity；7- output cable；8- gastight adhesive；9- package casing.
Specific embodiment
Technical solution of the present invention is described in detail below by attached drawing, but protection scope of the present invention is not limited to
The embodiment.
Embodiment: a kind of device reducing laser phase frequency noise testing fibre optic interferometer thermal noise, including fiber optic interferometric
Instrument module 1, temperature sensor 4 and shell；The fibre optic interferometer module 1 includes optic fibre light path 3, photodetection road and encapsulation
Shell 9, the optic fibre light path 3 and photodetector 2 constitute fibre optic interferometer, and the package casing 9 is by optic fibre light path 3 and photoelectricity
Detector 2 is packaged in its shell, and the inner surface of the fibre optic interferometer module 1 is glued with temperature sensor 4, and the temperature passes
Sensor 4 is located at 9 case inside of package casing, and the package casing 9 uses plastic material or metal material, and size is according to optical fiber
Optical path 3 and the specification size of photodetector 2 are configured, and input optical fibre is provided on the package casing 9 and 4 signals are defeated
Cable 7 out, the output cable 7 use normal signal line or coaxial cable, and optical signal is input to encapsulation by the input optical fibre
In intracorporal 3 structure of optic fibre light path of 9 shell of shell, electric signal and temperature that photodetector 2 is converted to by the output cable 7
The output signal of degree sensor 4 is exported to 9 outside of package casing；
The shell 6 includes shell inner cavity 63, shell lumen 61, shell exocoel 62 and three layers of shell shell wall, the shell inner cavity
63 are located at 6 medium position of shell, and shell shell wall, the shell lumen are provided between the shell lumen 61 and shell inner cavity 63
It is provided with shell shell wall between 61 and shell exocoel 62, shell shell wall is provided on the outside of the shell exocoel 62, the optical fiber is dry
Interferometer module 1 is fixed in shell inner cavity 63, and the shell lumen 61 is that confined space places liquid nitrogen 5 or liquid helium inside it,
Liquid nitrogen 5 or liquid helium can make the temperature of shell lumen 61 maintain subzero 100 degrees Celsius hereinafter, to make the light in shell inner cavity
Fine interferometer module 1 is in subzero 100 degrees Celsius of environment below, and the shell exocoel 62 is that closed space is pumped into
Vacuum carries out isolation external temperature to the influence inside the present apparatus.
It is provided with aperture on the shell 6, the aperture is by the input optical fibre and output cable in fibre optic interferometer module 1
7 introduce on the outside of case bodies, and the perforation channels are sealed, the shell wall of the shell 6 by aluminium alloy or stainless steel production and
At；The size of the aperture is arranged according to the thickness of input optical fibre and output cable 7, and input optical fibre and defeated is placed in the aperture
Sealing is filled by gastight adhesive 8 after cable 7 out.
The present invention places liquid nitrogen 5 by chamber 61 in the housing or liquid helium, the shell exocoel 62 are evacuated, shell
The structure that lumen and shell exocoel combine can ensure the work of fibre optic interferometer module at subzero 100 degrees Celsius or less.To
Fundamentally reduce fibre optic interferometer thermal noise.
As described above, must not be explained although the present invention has been indicated and described referring to specific preferred embodiment
For the limitation to invention itself.It without prejudice to the spirit and scope of the invention as defined in the appended claims, can be right
Various changes can be made in the form and details for it.
Claims (5)
1. a kind of device for reducing laser phase frequency noise testing fibre optic interferometer thermal noise, it is characterised in that: dry including optical fiber
Interferometer module, temperature sensor and shell；The fibre optic interferometer module includes that optic fibre light path, photodetection road and encapsulation are outer
Shell, the optic fibre light path and photodetector constitute fibre optic interferometer, and the package casing is by optic fibre light path and photodetector
It is packaged in its shell, the inner surface of the fibre optic interferometer module is glued with temperature sensor, and the temperature sensor is located at
Package casing case inside is provided with input optical fibre and several groups signal output cable, the input light on the package casing
Optical signal is input in the intracorporal optic fibre light path structure of package casing shell by fibre, and the output cable converts photodetector
To electric signal and the output signal of temperature sensor export on the outside of package casing；
The shell includes shell inner cavity, shell lumen, shell exocoel and three layers of shell shell wall, and the shell inner cavity is located at shell
Medium position is provided with shell shell wall, between the shell lumen and shell exocoel between the shell lumen and shell inner cavity
It is provided with shell shell wall, is provided with shell shell wall on the outside of the shell exocoel, the fibre optic interferometer module is fixed in shell
Intracavitary, the shell lumen places liquid nitrogen or liquid helium, the shell exocoel are evacuated.
2. a kind of device for reducing laser phase frequency noise testing fibre optic interferometer thermal noise according to claim 1,
It is characterized in that: being provided with aperture on the shell, the aperture is by the input optical fibre and output cable in fibre optic interferometer module
It introduces on the outside of case body, the perforation channels are sealed, and the shell wall of the shell is made by aluminium alloy or stainless steel.
3. a kind of device for reducing laser phase frequency noise testing fibre optic interferometer thermal noise according to claim 2,
Be characterized in that: the size of the aperture is arranged according to the thickness of input optical fibre and output cable, and input light is placed in the aperture
Sealing is filled by gastight adhesive after fine and output cable.
4. a kind of device for reducing laser phase frequency noise testing fibre optic interferometer thermal noise according to claim 1, special
Sign is: the package casing uses plastic material or metal material, and size is according to the rule of optic fibre light path and photodetector
Lattice size is configured.
5. a kind of device for reducing laser phase frequency noise testing fibre optic interferometer thermal noise according to claim 1, special
Sign is: the output cable is 4 output cables, and the output cable uses normal signal line or coaxial cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910287830.XA CN110006633A (en) | 2019-04-11 | 2019-04-11 | A kind of device reducing laser phase frequency noise testing fibre optic interferometer thermal noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910287830.XA CN110006633A (en) | 2019-04-11 | 2019-04-11 | A kind of device reducing laser phase frequency noise testing fibre optic interferometer thermal noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110006633A true CN110006633A (en) | 2019-07-12 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910287830.XA Pending CN110006633A (en) | 2019-04-11 | 2019-04-11 | A kind of device reducing laser phase frequency noise testing fibre optic interferometer thermal noise |
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| Country | Link |
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| CN (1) | CN110006633A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684678A (en) * | 2017-02-28 | 2017-05-17 | 中国科学院上海光学精密机械研究所 | Temperature compensation packaging device for fiber laser |
| CN107015287A (en) * | 2017-03-09 | 2017-08-04 | 中国科学院电工研究所 | A kind of gradiometry device and measuring method |
| CN108592964A (en) * | 2018-05-25 | 2018-09-28 | 山东省科学院激光研究所 | It is tunable to remove quick miniature fiber interferometer |
| CN208223502U (en) * | 2018-05-29 | 2018-12-11 | 西安工业大学 | A kind of CW with frequency modulation interference polarization maintaining optical fibre gyroscope with heat shielding function |
| CN208336803U (en) * | 2018-06-29 | 2019-01-04 | 中国船舶重工集团公司第七一五研究所 | A kind of high reliability optical fiber laser packaging system |
| CN109149330A (en) * | 2018-08-30 | 2019-01-04 | 华南理工大学 | A kind of 2 mu m waveband low noise narrow-line width single frequency optical fiber lasers |
| CN109256663A (en) * | 2018-11-21 | 2019-01-22 | 南京聚科光电技术有限公司 | A kind of optical fiber laser Noise Suppression Device based on dual fiber ring mode filter |
-
2019
- 2019-04-11 CN CN201910287830.XA patent/CN110006633A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684678A (en) * | 2017-02-28 | 2017-05-17 | 中国科学院上海光学精密机械研究所 | Temperature compensation packaging device for fiber laser |
| CN107015287A (en) * | 2017-03-09 | 2017-08-04 | 中国科学院电工研究所 | A kind of gradiometry device and measuring method |
| CN108592964A (en) * | 2018-05-25 | 2018-09-28 | 山东省科学院激光研究所 | It is tunable to remove quick miniature fiber interferometer |
| CN208223502U (en) * | 2018-05-29 | 2018-12-11 | 西安工业大学 | A kind of CW with frequency modulation interference polarization maintaining optical fibre gyroscope with heat shielding function |
| CN208336803U (en) * | 2018-06-29 | 2019-01-04 | 中国船舶重工集团公司第七一五研究所 | A kind of high reliability optical fiber laser packaging system |
| CN109149330A (en) * | 2018-08-30 | 2019-01-04 | 华南理工大学 | A kind of 2 mu m waveband low noise narrow-line width single frequency optical fiber lasers |
| CN109256663A (en) * | 2018-11-21 | 2019-01-22 | 南京聚科光电技术有限公司 | A kind of optical fiber laser Noise Suppression Device based on dual fiber ring mode filter |
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| Title |
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Application publication date: 20190712 |