CN104836104B - Compress the structure of optical fiber laser self-locking mode pulse - Google Patents
Compress the structure of optical fiber laser self-locking mode pulse Download PDFInfo
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- CN104836104B CN104836104B CN201510271036.8A CN201510271036A CN104836104B CN 104836104 B CN104836104 B CN 104836104B CN 201510271036 A CN201510271036 A CN 201510271036A CN 104836104 B CN104836104 B CN 104836104B
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Abstract
The present invention relates to a kind of structure for compressing optical fiber laser self-locking mode pulse, belong to optical fiber laser and fiber optical amplifier technology field, it is mainly characterized by being used to fiber amplifier improve the output performance of optical fiber laser, the present invention includes the process level that fiber amplifier and adjustable optical attenuator are constituted by the output end connection in optical fiber laser, the output for having the optical fiber laser of the continuous mode work of Self-mode-locking shows as being superimposed the light pulse in cycle on stable DC component, and the intensity of light pulse is noticeably greater than the intensity of DC component, the material and device that the present invention all can be commercially available using in the market build processing system, so as to realize high performance-price ratio, the technical program does not change this body structure of optical fiber laser, and optical fiber laser performance is improved to realize by post processing system and simple regulation.
Description
Technical field
It is to be used to fiber amplifier improve light the present invention relates to a kind of structure for compressing optical fiber laser self-locking mode pulse
The output performance of fibre laser, such as compresses the self-locking mode pulse of optical fiber laser, so as to realize high-performance jointed fiber laser
Device, belongs to optical fiber laser and fiber optical amplifier technology field.
Background technology
The optical fiber laser worked in a continuous manner is because of its small weight and volume, high beam weight, reliable and stable property
The advantages of energy etc., is received by increasing application.However, continuous optical fiber laser usually can be because of optical cavity by some
Disturbance factor or noise-excitation and produce many longitudinal modes, longitudinal mode pulse that these repetition rates are determined by cavity length can be because its be multiple
Strengthened by gain media, it is the same to show as mode locking pulse in the output of laser, i.e., be superimposed with average light power
It is periodically pulsing.Much using the occasions of jointed fiber lasers, it is this it is periodically pulsing be a kind of very big shortcoming,
Because luminous power is no longer invariable in time, the performance for the system being employed just can not be guaranteed.So, for one
The individual optical fiber laser continuously worked, such self-locking mode pulse has to compress or eliminated.Although having solved the problem
Methods and techniques, such as using the laser cavity structure of both-end pumping, so that reduce the length of non-pumping optical fiber and reduce saturated absorption,
But this method is due to needing the complexity and cost that add system using more pump light sources and related device.Another
In one method, very long non-gain fibre is saved by adding one in laser cavity, so that the recovery time of gain fibre
It is significantly less than the self-locking mode cycle, by the optical fiber added needs more than one kilometer of length, so significantly increasing laser
Weight and volume.
The content of the invention
The present invention for it is above-mentioned it is existing reduce optical fiber laser self-locking mode pulse method exist system complexity and
Cost is more expensive or add the weight and volume of laser not enough there is provided simple in construction, easily operated, widely applicable and have
Compared with a kind of structure of compression optical fiber laser self-locking mode pulse of high performance-price ratio.
The purpose of the present invention is achieved through the following technical solutions, a kind of knot for compressing optical fiber laser self-locking mode pulse
Structure, it is characterized in that, the structure is connected in the output end of optical fiber laser and between system or the input of measuring apparatus
Connect the process level including fiber amplifier and adjustable optical attenuator to constitute, realize the pressure of the self-locking mode impulse amplitude of optical fiber laser
Contracting.
The process level is constituted by the two-stage connected or no less than two-stage series connection.
The input connection adjustable optical attenuator of fiber amplifier in the process level, optical fiber laser output end connection can
The input of optical attenuator, to adjust the entrant laser power of fiber amplifier, so that the unsaturation for optimizing the process level is put
The performance of big and saturation amplification, process level output end adjustable optical attenuator is used to contrast in laser power before and after treatment
The component of continuous-stable and the relative size of pulse component, so that it is determined that processing afterpulse amplitude is much smaller than processing prepulse width
Degree.
The input of adjustable optical attenuator connects the output end of optical band pass filter in the process level, and optical fiber laser is defeated
Go out the input of end connection optical band pass filter, optical band pass filter excludes unwanted wavelength components, so as to strengthen processing system
The signal to noise ratio and stability of system output.
Optical band pass filter input connects the output end of optoisolator in the process level, and optical fiber laser output end connects
The input of optoisolator is connect, so as to strengthen the one-way of whole processing system Laser Transmission, by eliminating or reducing backlight
Signal and improve processing system output signal to noise ratio and stability.
The present invention by optical fiber laser output end connection include fiber amplifier and adjustable optical attenuator composition
Process level, the output for having the optical fiber laser of the continuous mode work of Self-mode-locking shows as being superimposed on stable DC component
The light pulse in cycle, and the intensity of light pulse is noticeably greater than the intensity of DC component.Using fiber amplifier to optical signal amplification
Gain saturatiuon characteristic, by adjusting light adjustable attenuator so that relative to the stable DC luminous power self-locking mode pulse of amplification
The amplification quantity of composition is minimized, so as to obtain a kind of effect of pulse compression.Such processing can be using one or more levels bag
The processing structure that fiber amplifier and adjustable optical attenuator are constituted is included, for most of applications, using process level as two-stage
Structure just can obtain the compression of significant self-locking mode pulse.Self-locking mode pulse repetition is relative to steady in laser power after processing
Determining luminous power composition has very big decline, so as to be employed and meet system requirements.The present invention it is simple in construction, easily operated,
It is widely applicable, the compression available for the self-locking mode pulse of any continuous wave laser with Self-mode-locking.Present invention, avoiding
The volume weight brought using many kilometers of long optical fibers is big and other resultant problems, can also avoid using two directional pump method
In brought using more pump light sources or light energy and related device system complex and high cost the problem of.The present invention
The material and device that all can be commercially available using in the market build processing system, so as to realize high performance-price ratio.This skill
Art scheme does not change this body structure of optical fiber laser, and realizes raising optical fiber by post processing system and simple regulation
Laser performance.
Brief description of the drawings
Fig. 1 is structured flowchart of the present invention；
Structured flowcharts of the Fig. 2 for the present invention after increase optical band pass filter on the basis of Fig. 1；
Structured flowcharts of the Fig. 3 for the present invention after increase optoisolator on the basis of Fig. 2；
The structured flowchart that Fig. 4 connects for some process levels in the present invention；
In figure, 1 optical fiber laser, 1-1 optical fiber laser output ends, 2 optoisolators, 2-1 optoisolator inputs, 2-2
Optoisolator output end, 3 optical band pass filters, 3-1 optical band pass filter inputs, 3-2 optical band pass filter output ends, 4 can
Optical attenuator, 4-1 adjustable optical attenuator inputs, 4-2 adjustable optical attenuator output ends, 5 fiber amplifiers, 5-1 optical fiber is put
Big device input, 5-2 fiber amplifier output ends, 6 process levels, the input of 6-1 process levels 6, the output end of 6-2 process levels 6, at 7
Manage level, the input of 7-1 process levels 7, the output end of 7-2 process levels 7,8 process levels, the input of 8-1 process levels 8,8-2 process levels 8
Output end.
Embodiment
The present invention is further illustrated in conjunction with the accompanying drawings and embodiments.
Embodiment one：As shown in figure 1, the present embodiment is single-stage fiber amplifier process level, the optical fiber of optical fiber laser 1
Laser output 1-1 is connected to the adjustable optical attenuator input 4-1 of the adjustable optical attenuator 4 in process level, adjustable light decay
Subtract the fiber amplifier input 5-1 that device output end 4-2 is connected to fiber amplifier 5, fiber amplifier output end 5-2 connections fortune
With the input of system；When measuring apparatus need to be connected, fiber amplifier output end 5-2 connection adjustable optical attenuators with avoid survey
Amount equipment is damaged by high power laser light（Luminous power numerical value is measured with light power meter）, adjustable optical attenuator output end connection light-receiving
Machine input, the electricity output port connection oscillograph of photoreceiver.Adjust the adjustable optical attenuator 4 before fiber amplifier 5 and see
The change from impulse amplitude on oscillograph is examined, until reaching minimum from impulse amplitude, now, the laser composition of continuous-stable is by light
Fiber amplifier 5 normally amplifies, and self-locking mode pulse is not amplified approximately even by limitation amplification, so whole structure is exactly self-locking
Mould pulse is compressed.In order to observe the effect using improved structure, the output end of whole system can connect a variable optical attenuation
Device, the output end of adjustable optical attenuator is connected to a spectroanalysis instrument, is demonstrate,proved from the range stability and signal to noise ratio of spectral signal
Real improved performance.
Embodiment two：As shown in Figure 2,3, the present embodiment is the improvement of single-stage fiber amplifier process level, optical-fiber laser
The optoisolator input 2-1 of optoisolator 2 in the optical fiber laser output end 1-1 connection process levels of device 1, optoisolator is defeated
Go out to hold 2-2 to be connected to the optical band pass filter input 3-1 of optical band pass filter 3, optical band pass filter output end 3-2 is connected to
The adjustable optical attenuator input 4-1 of adjustable optical attenuator 4, adjustable optical attenuator output end 4-2 are connected to fiber amplifier 5
The input of system is used in fiber amplifier input 5-1, fiber amplifier output end 5-2 connection；When measuring apparatus need to be connected
When, fiber amplifier output end 5-2 connection adjustable optical attenuators are to avoid measuring apparatus from being damaged by high power laser light（Use luminous power
Meter measurement luminous power numerical value）, the output end connection photoreceiver input of adjustable optical attenuator, the electricity output port of photoreceiver
Connect oscillograph.The change from impulse amplitude on adjustable optical attenuator 4 and observation oscilloscope before amplifier is adjusted, until from
Impulse amplitude reaches minimum, now, and the laser composition of continuous-stable is normally amplified by fiber amplifier, and self-locking mode pulse is limited
System amplification is not amplified approximately even, is compressed so whole structure is exactly self-locking mode pulse.Improved structure is used in order to observe
Effect, the output end of whole system may be connected to adjustable optical attenuator, and the output end of adjustable optical attenuator is connected to a light
Spectrometer, improved performance is confirmed from the range stability and signal to noise ratio of spectral signal.
Embodiment three：As shown in Figure 3,4, the present embodiment is connected for multi-stage fiber amplifier process level, optical fiber laser 1
Optical fiber laser output end 1-1 be connected to first fiber amplifier process level 6, first fiber amplifier process level 6
Output end is connected to the input of second fiber amplifier process level 7, by that analogy, n-th fiber amplifier process level 8
Output end connection is with the input of system, and each processing level structure can be identical with shown in Fig. 1 or Fig. 2 or Fig. 3；When measurement need to be connected
During equipment, fiber amplifier output end 5-2 connection adjustable optical attenuators are to avoid measuring apparatus from being swashed by high power in afterbody
Light loss is bad（Luminous power numerical value is measured with light power meter）, the output end connection photoreceiver input of adjustable optical attenuator, light connects
The electricity output port connection oscillograph of receipts machine.Adjust on adjustable optical attenuator and observation oscilloscope before amplifier from pulse width
The change of degree, until self-locking mode impulse amplitude reaches minimum, now, the laser composition of continuous-stable is normally put by fiber amplifier
Greatly, and self-locking mode pulse by limitation amplification even do not amplify approximately, compressed so whole structure is exactly self-locking mode pulse.For
Observation is using the effect of improved structure, and the output end of whole system is connected to adjustable optical attenuator, adjustable optical attenuator it is defeated
Go out end and be connected to a spectroanalysis instrument, improved performance is confirmed from the range stability and signal to noise ratio of spectral signal.Here need
It is noted that being that the system for cascading two fiber amplifier process levels just may be used using N=2 for most of application requirements
To obtain the compression of significant self-locking mode pulse.
Fiber amplifier 5, adjustable optical attenuator 4, optical band pass filter 3 and optoisolator 2 in above example are
The product that in the market can be purchased.When fiber amplifier 5 is voluntarily built by some related components, the present invention will use following institute
State embodiment.
Embodiment four：The present embodiment is connected for multi-stage fiber amplifier process level, and the fiber amplifier in process level
Voluntarily build, pump laser output end is connected to the input for the 1xN luminous-power distributors for being divided into N roads, luminous-power distributor
Output end be connected respectively to the first order, the second level, the pumping input of fiber amplifier in N grades of process levels.Optical fiber swashs
The optical fiber laser output end of light device is connected to the input of first process level, and the output end of first process level is connected to
The input of two process levels, by that analogy, the output end connection of n-th process level is with the input of system, each process level
Structure can be identical with shown in Fig. 1 or Fig. 2 or Fig. 3；When that need to connect measuring apparatus, the output end of n-th process level is connected to light
Attenuator is to avoid measuring apparatus from being damaged by high power laser light（Luminous power numerical value is measured with light power meter）, the output of optical attenuator
End connection photoreceiver input, the electricity output port connection oscillograph of photoreceiver.Adjust the variable optical attenuation before amplifier
From the change of impulse amplitude on device and observation oscilloscope, until minimum is reached from impulse amplitude, now, the laser of continuous-stable
Composition is normally amplified by fiber amplifier, and self-locking mode pulse is not amplified approximately even by limitation amplification, so whole structure
It is exactly that self-locking mode pulse is compressed.In order to observe the effect using improved structure, the output end of whole system is connected to tunable optical
Attenuator, the output end of adjustable optical attenuator is connected to a spectroanalysis instrument, from the range stability and noise of spectral signal
Than confirming improved performance.
Claims (5)
1. a kind of structure for compressing optical fiber laser self-locking mode pulse, it is characterized in that, the structure is in the defeated of optical fiber laser
Go out end and with the place including adjustable optical attenuator and fiber amplifier that is linked in sequence between system or the input of measuring apparatus
Level is managed to constitute.
2. the structure of the compression optical fiber laser self-locking mode pulse according to claim 1, it is characterized in that, the process level
Constituted by the two-stage connected or no less than two-stage series connection.
3. the structure of compression optical fiber laser self-locking mode pulse according to claim 1 or 2, it is characterized in that, the place
The input connection adjustable optical attenuator of fiber amplifier in level is managed, optical fiber laser output end connects the defeated of adjustable optical attenuator
Enter end.
4. the structure of compression optical fiber laser self-locking mode pulse according to claim 1 or 2, it is characterized in that, the place
The input for managing adjustable optical attenuator in level connects the output end of optical band pass filter, and optical fiber laser output end connection light belt leads to
The input of wave filter.
5. the structure of compression optical fiber laser self-locking mode pulse according to claim 1 or 2, it is characterized in that, the place
The output end that optical band pass filter input in level connects optoisolator is managed, optical fiber laser output end connects the defeated of optoisolator
Enter end.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101083382A (en) * | 2007-06-28 | 2007-12-05 | 吉林大学 | Low noise tunable single frequency fiber laser for full-optical communication and its test system |
| CN101986483A (en) * | 2010-10-08 | 2011-03-16 | 北京航空航天大学 | Passive mode-locked pulsed laser |
| CN102116993A (en) * | 2010-12-29 | 2011-07-06 | 清华大学 | Pulse phase stabilization method and device |
| CN103346462A (en) * | 2013-06-24 | 2013-10-09 | 天津理工大学 | Passive mode-locking optical fiber laser based on nonlinear optical fiber magnifying glass |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7394591B2 (en) * | 2000-05-23 | 2008-07-01 | Imra America, Inc. | Utilization of Yb: and Nd: mode-locked oscillators in solid-state short pulse laser systems |
-
2015
- 2015-05-26 CN CN201510271036.8A patent/CN104836104B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101083382A (en) * | 2007-06-28 | 2007-12-05 | 吉林大学 | Low noise tunable single frequency fiber laser for full-optical communication and its test system |
| CN101986483A (en) * | 2010-10-08 | 2011-03-16 | 北京航空航天大学 | Passive mode-locked pulsed laser |
| CN102116993A (en) * | 2010-12-29 | 2011-07-06 | 清华大学 | Pulse phase stabilization method and device |
| CN103346462A (en) * | 2013-06-24 | 2013-10-09 | 天津理工大学 | Passive mode-locking optical fiber laser based on nonlinear optical fiber magnifying glass |
Non-Patent Citations (1)
| Title |
|---|
| 自锁模掺镱光纤激光器研究;梁建中等;《中国激光》;20021025;全文 * |
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