CN104051956A - Multi-laser frequency locking device - Google Patents
Multi-laser frequency locking device Download PDFInfo
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- CN104051956A CN104051956A CN201410287123.8A CN201410287123A CN104051956A CN 104051956 A CN104051956 A CN 104051956A CN 201410287123 A CN201410287123 A CN 201410287123A CN 104051956 A CN104051956 A CN 104051956A
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Abstract
The invention discloses a multi-laser frequency locking device. The multi-laser frequency locking device comprises at least N lasers, at least 2N laser drivers, at least N first optical couplers, a second optical coupler and at least N-1 third optical couplers, wherein N is a natural number larger than or equal to 2; every two laser drivers drive one laser together; the first optical couplers are used for dividing light output by all the lasers into two paths of light; the second optical coupler is used for carrying out coupling on the first path of light of two paths of light of each laser and outputting the first path of light of each laser; the third optical couplers are used for combining the second paths of light of two paths of light of two adjacent lasers and outputting combined light to achieve optical beat frequency; by means of detection of the combined light, the N lasers are mutually locked at a preset frequency interval wave length in a paired locking mode. According to the multi-laser frequency locking device, optical frequency combs with high frequency stability and under narrow line width pressure can be obtained.
Description
Technical field
The present invention relates to field of photoelectric technology, relate in particular to a kind of multi-laser frequency locker.
Background technology
High frequency stabilization narrow linewidth semiconductor laser has very important application in the field such as laser cooling and trapping, optical measurement of laser absorption spectrum, coherent optical communication, quantum frequency standards, neutral atom.Because semiconductor laser is in the time freely turning round, frequency fluctuation and drift are larger, people have taked many measures and scheme to improve the long-term and short-term stability of laser frequency for this reason, and its core concept is to utilize the transition line of the resonant transmission peak in chamber or atom, molecule as with reference to frequency, laser being carried out to frequency stabilization.Once determine reference frequency, multiple lasers and reference light need to be carried out to the relevant locking of wavelength, improve the frequency stability of each laser with this.In addition, by two or more independently semiconductor laser mutually lock with a certain fixing frequency interval wavelength, can realize optical frequency com.
The frequency of laser changes along with drive current size, for typical Distributed Feedback Laser, and the every variation of drive current 1mA, wavelength shift is 0.01nm, is converted to frequency domain, near the laser for wavelength 1.55 microns, light frequency variation is about 1.25GHz.As can be seen here, in order accurately to control laser wavelength, the necessary low noise of laser drive current and size of current tuning precision are high.
Modal frequency locking technology is to utilize optical standard tool, by testing laser device Frequency Locking on one of them filtering broach of etalon, but, the frequency stability of this method depends on the stability of etalon completely, and because the fineness of etalon is limited, can not realize the frequency stability of high requirement.By after two sublaser beat frequencies, by photo-detector, convert optical frequency rate variance to beat frequency microwave signal, realize from the conversion in Dao electricity territory, light territory, improve greatly frequency measurement resolution, for the Frequency Locking of laser provides reliable basis.
The present invention combines optical heterodyne beat frequency technology and high-fineness electric current wavelength tunable technology, has realized the mutual Frequency Locking to multiple lasers.
Summary of the invention
Main purpose of the present invention is to provide a kind of multi-laser frequency locker, and in this scheme, the difference on the frequency between adjacent laser carries out difference on the frequency locking and quantification by optical heterodyne beat frequency technology; Semiconductor laser is combined driving by two larger laser drivers of step-length difference respectively, to realize the wavelength electric current tuning of different amplitudes.The present invention is by controlling the relative frequency stability between various lasers, and the microwave frequency that photo-beat is produced frequently, as feedback signal, by high-accuracy wavelength electric current tuning, can realize very high-precision relative frequency stability.
The invention provides a kind of multi-laser frequency locker, it comprises:
At least N laser, wherein N is more than or equal to 2 natural number;
At least 2N laser driver, and a laser of the common driving of every two laser drivers;
At least N the first optical coupler, for being divided into two-way light by the light of each laser output;
The second optical coupler, for being coupled the first via light of the two-way light of each laser and export;
At least N-1 the 3rd optical coupler, it merges light for the second road light of the two-way light of every adjacent two lasers is merged respectively to output, to realize photo-beat frequently;
Wherein, by detecting described merging light, make a described N laser fixed with the interlocking of preset frequency spacing wave appearance in the mode locking between two.
The invention has the beneficial effects as follows: the multi-laser frequency locker of this conceptual design can be by the mutual beat signal between laser, effectively obtain the wavelength interval information between laser, obtain uniformly-spaced correlation of long-term laser wavelength by circuit control, and can by and the desirable laser of standard between Frequency Locking, realize the optical frequency com of height frequency stabilization and linewidth narrowing.
Brief description of the drawings
Fig. 1 is the structural representation of multi-laser frequency locker provided by the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further detail.
Key of the present invention is two parts: laser frequency difference test locking; The control of laser optical frequency tuning.The test of laser frequency difference, based on optical heterodyne beat frequency technology, is transformed into microwave domain by beat frequency by the frequency difference information between two lasers and detects.
The drive current of laser determines the frequency stability of laser.Regulate laser drive current can effectively control the excitation wavelength (light frequency) of laser.In the present invention, the current drives of each laser adopts the laser of two different ranges to drive, and then two drive currents is merged a laser is carried out to current drives.The FEEDBACK CONTROL of laser wavelength adopts digital quantization program to realize, and two different range electric currents merge the benefit driving and are can the control electric current step-length of laser be accomplished very little.For example, first drive current range is 300mA, and second drive current range is 10mA, and the size of current of two lasers is all carried out quantified controlling by the digital to analog converter of 12, the minimum step that can obtain is 2.5 microamperes, and current range can reach the current drives of 300mA.If just single driver, is difficult to take into account very little step-length and current drives in a big way simultaneously.
Refer to shown in Fig. 1, the invention provides a kind of multi-laser frequency locker, comprising:
The first laser 1, second laser 2; Two lasers are as the lasing light emitter that forms two broach in optical frequency com.
The first laser driver 3, the second laser driver 4, these two laser drivers provide drive current jointly to the first laser; The 3rd laser driver 5, the 4th laser driver 6, these two laser drivers provide drive current to second laser jointly; Wherein the first laser driver 3 is connected with the first laser 1 input with the second laser driver 4 outputs, and the 3rd laser driver 5 is connected with second laser 2 inputs with the 4th laser driver 6 outputs;
The first optical coupler 12, the second optical coupler 13, the 3rd optical coupler 14, the 4th optical coupler 15, wherein, the input of the first optical coupler 12 is connected with the output of the first laser 1, the input of the 3rd optical coupler 14 is connected with the output of second laser 2, the first input end of the second optical coupler 13 is connected with the first output of the first optical coupler 12 and the first output of the 3rd optical coupler 14 respectively with the second input, the first input end of the 4th optical coupler 15 is connected with the second output of the first optical coupler 12 and the second output of the 3rd optical coupler 14 respectively with the second input, wherein first and the 3rd optical coupler respectively the output light of laser 1 and laser 2 is divided into two, two lasers wherein Yi road the 4th optical coupler 15 merge and realize photo-beat frequently, enter photo-detector 7 detect as feedback signal.An other road of two lasers merges through the second optical coupler 13, exports as frequency comb signal.
Photodetector 7, its input is connected with the output of the 4th optical coupler 15, and the light signal that described the 4th optical coupler 15 is exported carries out beat frequency and produces microwave signal;
Microwave filter 8, its input is connected with the output of photodetector 7, carries out filtering for the microwave signal that photodetector 7 is exported;
Microwave detector 9, export for detection of microwave filter 8 through filtered microwave signal, if beat signal is just positioned at the passband of microwave filter 8, wave detector 9 has DC signal output, and the amplitude of direct current signal is directly proportional to filtered beat signal; If beat signal frequency is not in the passband of microwave filter 8, wave detector does not have signal output, at this moment by tuned laser drive current, until there is rectified signal, and by FEEDBACK CONTROL by current stabilization the position in rectified signal amplitude maximum.
Modulus conversion chip 10, carries out digital quantization for the direct current signal that described microwave detector 9 is exported.
Singlechip chip 11, its input is connected with the output of modulus conversion chip 10, and 4 road outputs of singlechip chip are connected with the input of the first laser driver 3, the second laser driver 4, the 3rd laser driver 5, the 4th laser driver 6 respectively; Described singlechip chip 11 is according to the signal after modulus conversion chip 10 digital quantizations, the drive current to described first to fourth laser driver output carry out vernier control, to realize laser wavelength locking.
Wherein constant current drive current superposing control first laser 1 of the first laser driver 3 and the second laser driver 4; The wherein constant current drive current superposing control second laser 2 of the 3rd laser driver 5 and the 4th laser driver 6;
The detection wave band of microwave detector 9 can cover the filtering wave band of microwave filter 8;
The quantity of controlled laser is at two or more, wherein each laser is driven by two laser driver constant current drive current stacks, and utilizes in order described photodetector 7, microwave filter 8, microwave detector 9, modulus conversion chip 10 and singlechip chip 11 in the manner described above described multiple lasers to be locked within the scope of certain wavelength difference between two;
Single-chip microcomputer carries out vernier control according to the sampled signal of modulus conversion chip to the drive current of laser, to realize laser wavelength locking.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a multi-laser frequency locker, it comprises:
At least N laser, wherein N is more than or equal to 2 natural number;
At least 2N laser driver, and a laser of the common driving of every two laser drivers;
At least N the first optical coupler, for being divided into two-way light by the light of each laser output;
The second optical coupler, for being coupled the first via light of the two-way light of each laser and export;
At least N-1 the 3rd optical coupler, it merges light for the second road light of the two-way light of every adjacent two lasers is merged respectively to output, to realize photo-beat frequently;
Wherein, by detecting described merging light, make a described N laser fixed with the interlocking of preset frequency spacing wave appearance in the mode locking between two.
2. device as claimed in claim 1, wherein, the constant current drive current stack of every two laser drivers drives one of them laser.
3. device as claimed in claim 1 or 2, it also comprises:
Photodetector, it carries out beat frequency for the described merging light that current the 3rd coupler corresponding to two lasers that carries out wavelength locking exported and produces microwave signal.
4. device as claimed in claim 3, it also comprises:
Microwave detector, it is for detection of described microwave signal, and according to testing result output for regulating the direct current signal of drive current of laser driver output.
5. device as claimed in claim 4, wherein: the direct current signal of described microwave detector output is directly proportional to described microwave signal.
6. device as claimed in claim 4, it also comprises:
Modulus conversion chip, it is for converting described direct current signal to digital signal;
Singlechip chip, its drive current for exporting according to four laser drivers of the current two-laser that carries out wavelength locking described in described digital signal vernier control.
7. device as claimed in claim 4, it also comprises:
Microwave filter, it is for carrying out filtering to described microwave signal;
Described microwave detector, for detecting filtered microwave signal.
8. device as claimed in claim 7, wherein, the detection wave band of described microwave detector can cover the filtering wave band of described microwave filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410287123.8A CN104051956A (en) | 2014-06-24 | 2014-06-24 | Multi-laser frequency locking device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410287123.8A CN104051956A (en) | 2014-06-24 | 2014-06-24 | Multi-laser frequency locking device |
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| CN104051956A true CN104051956A (en) | 2014-09-17 |
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| CN201410287123.8A Pending CN104051956A (en) | 2014-06-24 | 2014-06-24 | Multi-laser frequency locking device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106025794A (en) * | 2016-07-21 | 2016-10-12 | 中国科学院半导体研究所 | Frequency-stabilized semiconductor laser device based on backward detection of Fabry-Perot etalon |
| CN109787077A (en) * | 2019-02-26 | 2019-05-21 | 上海理工大学 | Tunable multi-wavelength femtosecond light comb light source based on raman gain fiber |
-
2014
- 2014-06-24 CN CN201410287123.8A patent/CN104051956A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| JEFFERY J. MAKI ET AL.: "Stabilized diode-laser system with grating feedback and frequency-offset locking", 《OPTICS COMMUNICATIONS》 * |
| U. SCHUNEMANN ET AL.: "Simple scheme for tunable frequency offset locking of two lasers", 《REVIEW OF SCIENTIFIC INSTRUMENTS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106025794A (en) * | 2016-07-21 | 2016-10-12 | 中国科学院半导体研究所 | Frequency-stabilized semiconductor laser device based on backward detection of Fabry-Perot etalon |
| CN109787077A (en) * | 2019-02-26 | 2019-05-21 | 上海理工大学 | Tunable multi-wavelength femtosecond light comb light source based on raman gain fiber |
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Application publication date: 20140917 |