CN104836104A - Compression fiber laser self-locking mode pulse composition - Google Patents
Compression fiber laser self-locking mode pulse composition Download PDFInfo
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- CN104836104A CN104836104A CN201510271036.8A CN201510271036A CN104836104A CN 104836104 A CN104836104 A CN 104836104A CN 201510271036 A CN201510271036 A CN 201510271036A CN 104836104 A CN104836104 A CN 104836104A
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Abstract
The invention relates to a compression fiber laser self-locking mode pulse composition, and belongs to the fiber laser and fiber amplifier technical field; main features are that the fiber amplifier is used for improving output performance of the fiber laser; an output end of the fiber laser is connected with a processing level formed by a fiber amplifier and a variable optical attenuator; an output of the continuous mode working fiber laser with self-locking mode phenomenon is a stable DC component superposed by a periodical light pulse, wherein the intensity of the light pulse is obviously bigger than that of the DC component; the processing system can be constructed by material and devices capable of being purchased in the market, thus realizing high cost performance; the fiber laser self structure is not changed, and the postposition processing system and simple adjustment can improve performance of the fiber laser.
Description
Technical field
The present invention relates to the structure of a kind of squeezed light fibre laser self mode locking pulse, it is the output performance being used for fiber amplifier to improve fiber laser, as the self mode locking pulse of squeezed light fibre laser, thus realize high-performance jointed fiber laser, belong to fiber laser and fiber optical amplifier technology field.
Background technology
The fiber laser worked in a continuous manner is more and more applied acceptance because of its little weight and volume, high beam weight, reliable and stable performance etc. advantage.But; continuous print fiber laser usually can produce many longitudinal modes because of optical cavity by certain disturbance factor or noise-excitation; the longitudinal mode pulse that these repetition rates are determined by cavity length can be strengthened because of its Multiple through then out gain media; the output of laser shows as mode locking pulse the same, namely on average light power, be superimposed with periodic pulse.In a lot of occasion using jointed fiber laser, this periodic pulse is a kind of very large shortcoming, because luminous power is no longer invariable in time, the performance of the system be employed just can not be guaranteed.So for the fiber laser of a continuous operation, such self mode locking pulse must be compressed or eliminate.Although the existing Method and Technology solving this problem, as adopted the laser cavity structure of both-end pumping, thus reduce the length of non-pumping optical fiber and reduce saturated absorption, but the method is owing to needing to adopt more pump light source and related device and adding complexity and the cost of system.In another method, by adding the very long non-gain fibre of a joint in laser cavity, thus make be significantly less than the self mode locking cycle, because added optical fiber needs the length of more than one kilometer, so significantly increase the weight and volume of laser recovery time of gain fibre.
Summary of the invention
The complexity of system that the method that the present invention is directed to the pulse of above-mentioned existing reduction fiber laser self mode locking exists and cost more expensive or add the deficiency of weight and volume of laser, provide structure simple, be easy to operate, widely applicable and there is the structure of a kind of squeezed light fibre laser self mode locking pulse compared with high performance-price ratio.
The object of the invention is to be achieved through the following technical solutions, the structure of a kind of squeezed light fibre laser self mode locking pulse, it is characterized in that, described structure between output and the utilization system of fiber laser or the input of measuring equipment, is connected the process level comprising fiber amplifier and adjustable optical attenuator form, and realizes the compression of the self mode locking pulse amplitude of fiber laser.
Described process level is by the two-stage of connecting or be no less than two-stage series connection and form.
In described process level, the input of fiber amplifier connects adjustable optical attenuator, optical fiber laser output end connects the input of adjustable optical attenuator, to regulate the entrant laser power of fiber amplifier, thus optimize the unsaturation amplification of this process level and the performance of saturation amplification, process level output adjustable optical attenuator for contrasting the component of continous-stable and the relative size of pulse component in laser power before and after treatment, thus determines that process afterpulse amplitude is much smaller than process prepulse amplitude.
In described process level, the input of adjustable optical attenuator connects the output of optical band pass filter, optical fiber laser output end connects the input of optical band pass filter, optical band pass filter gets rid of unwanted wavelength components, thus the signal to noise ratio of strengthening treatment system output and stability.
In described process level, optical band pass filter input connects the output of optical isolator, optical fiber laser output end connects the input of optical isolator, thus strengthen the one-way of whole treatment system laser transmission, signal to noise ratio and the stability for the treatment of system output is improved by eliminating or reduce reverse optical signal.
The present invention is by connecting the process level comprising fiber amplifier and adjustable optical attenuator formation at the output of fiber laser, have the output of the fiber laser of the continuous mode work of Self-mode-locking to show as on stable DC component and superposed the light pulse in cycle, and the intensity of light pulse is significantly greater than the intensity of DC component.Utilize fiber amplifier to the gain saturation characteristic of optical signal amplification, by regulating light adjustable attenuator, making to minimize relative to the amplification quantity of the stable DC luminous power self mode locking pulse repetition amplified, thus obtaining a kind of effect of pulse compression.Such process can adopt one or more levels to comprise the process structure of fiber amplifier and adjustable optical attenuator formation, for great majority application, adopts the such process level structure of two-stage just can obtain the compression of significant self mode locking pulse.In laser power after process, self mode locking pulse repetition has very large decline relative to light stable power Components, thus can be employed and meet system requirements.Structure of the present invention is simple, be easy to operation, widely applicable, can be used for any compression with the self mode locking pulse of the continuous wave laser of Self-mode-locking.Present invention, avoiding large and other the resultant problem of the volume weight adopting many kilometers of long optical fibers to bring, also can avoid using more pump light source or light energy and related device in employing two directional pump method and the problem of the system complex brought and high cost.The present invention can all use the materials and devices that market can buy to build treatment system, thus can realize high performance-price ratio.The technical program does not change this body structure of fiber laser, and realizes improving fiber laser performance by post processing system and simple adjustment.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is the structured flowchart after the present invention increases optical band pass filter on the basis of Fig. 1;
Fig. 3 is the structured flowchart after the present invention increases optical isolator on the basis of Fig. 2;
Fig. 4 is the structured flowchart of some process level series connection in the present invention;
In figure, 1 fiber laser, 1-1 optical fiber laser output end, 2 optical isolators, 2-1 optical isolator input, 2-2 optical isolator output, 3 optical band pass filters, 3-1 optical band pass filter input, 3-2 optical band pass filter output, 4 adjustable optical attenuators, 4-1 adjustable optical attenuator input, 4-2 adjustable optical attenuator output, 5 fiber amplifiers, 5-1 fiber amplifier input, 5-2 fiber amplifier output, 6 process levels, 6-1 process level 6 input, 6-2 process level 6 output, 7 process levels, 7-1 process level 7 input, 7-2 process level 7 output, 8 process levels, 8-1 process level 8 input, 8-2 process level 8 output.
Embodiment
Further illustrate the present invention in conjunction with the accompanying drawings and embodiments.
Execution mode one: as shown in Figure 1, the present embodiment is single-stage fiber amplifier process level, the optical fiber laser output end 1-1 of fiber laser 1 is connected to the adjustable optical attenuator input 4-1 of the adjustable optical attenuator 4 in process level, adjustable optical attenuator output 4-2 is connected to the fiber amplifier input 5-1 of fiber amplifier 5, and fiber amplifier output 5-2 connects the input of utilization system; When measuring equipment need be connected, fiber amplifier output 5-2 connects adjustable optical attenuator to be damaged (measuring luminous power numerical value with light power meter) by high power laser light to avoid measuring equipment, adjustable optical attenuator output connects optical receiver input, and the electric output port of optical receiver connects oscilloscope.Regulate the adjustable optical attenuator 4 before fiber amplifier 5 and from the change of pulse amplitude on observation oscilloscope, until reach minimum from pulse amplitude, now, the laser composition of continous-stable is normally amplified by fiber amplifier 5, and self mode locking pulse is limited to amplify even approximate not amplification, compressed so whole structure is exactly self mode locking pulse.In order to observe the effect using modified node method, the output of whole system can connect an adjustable optical attenuator, and the output of adjustable optical attenuator is connected to a spectroanalysis instrument, from the performance that range stability and the signal to noise ratio confirmation of spectral signal improve.
Execution mode two: as Fig. 2, shown in 3, the present embodiment is the improvement of single-stage fiber amplifier process level, the optical isolator input 2-1 of the optical isolator 2 in the optical fiber laser output end 1-1 connection handling level of fiber laser 1, optical isolator output 2-2 is connected to the optical band pass filter input 3-1 of optical band pass filter 3, optical band pass filter output 3-2 is connected to the adjustable optical attenuator input 4-1 of adjustable optical attenuator 4, adjustable optical attenuator output 4-2 is connected to the fiber amplifier input 5-1 of fiber amplifier 5, fiber amplifier output 5-2 connects the input of utilization system, when measuring equipment need be connected, fiber amplifier output 5-2 connects adjustable optical attenuator to be damaged (measuring luminous power numerical value with light power meter) by high power laser light to avoid measuring equipment, the output of adjustable optical attenuator connects optical receiver input, and the electric output port of optical receiver connects oscilloscope.Adjustable optical attenuator 4 before resonance-amplifier from the change of pulse amplitude on observation oscilloscope, until reach minimum from pulse amplitude, now, the laser composition of continous-stable is normally amplified by fiber amplifier, and self mode locking pulse is limited to amplify even approximate not amplification, compressed so whole structure is exactly self mode locking pulse.In order to observe the effect using modified node method, the output of whole system can be connected to adjustable optical attenuator, and the output of adjustable optical attenuator is connected to a spectroanalysis instrument, from the performance that range stability and the signal to noise ratio confirmation of spectral signal improve.
Execution mode three: as shown in Figure 3,4, the present embodiment is the series connection of multi-stage fiber amplifier process level, the optical fiber laser output end 1-1 of fiber laser 1 is connected to first fiber amplifier process level 6, the output of first fiber amplifier process level 6 is connected to the input of second fiber amplifier process level 7, by that analogy, the output of N number of fiber amplifier process level 8 connects the input of utilization system, and each process level structure can be identical with shown in Fig. 1 or Fig. 2 or Fig. 3; When measuring equipment need be connected, in afterbody, fiber amplifier output 5-2 connects adjustable optical attenuator to avoid measuring equipment by high power laser light damage (measuring luminous power numerical value with light power meter), the output of adjustable optical attenuator connects optical receiver input, and the electric output port of optical receiver connects oscilloscope.Adjustable optical attenuator before resonance-amplifier from the change of pulse amplitude on observation oscilloscope, until self mode locking pulse amplitude reaches minimum, now, the laser composition of continous-stable is normally amplified by fiber amplifier, and self mode locking pulse is limited to amplify even approximate not amplification, compressed so whole structure is exactly self mode locking pulse.In order to observe the effect using modified node method, the output of whole system is connected to adjustable optical attenuator, and the output of adjustable optical attenuator is connected to a spectroanalysis instrument, from the performance that range stability and the signal to noise ratio confirmation of spectral signal improve.Here it is pointed out that for great majority application requirement, adopt the system of N=2 and cascade two fiber amplifier process levels just can obtain the compression of significant self mode locking pulse.
Fiber amplifier 5 in above embodiment, adjustable optical attenuator 4, optical band pass filter 3 and optical isolator 2 are the product that market can be purchased.When fiber amplifier 5 is built voluntarily by some related components, the present invention will adopt the following stated execution mode.
Execution mode four: the present embodiment is the series connection of multi-stage fiber amplifier process level, and the fiber amplifier in process level is built voluntarily, pump laser output is connected to the input of the 1xN luminous-power distributor being divided into N road, and the output of luminous-power distributor is connected respectively to the pumping input of the fiber amplifier in the first order, the second level, N level process level.The optical fiber laser output end of fiber laser is connected to the input of first process level, the output of first process level is connected to the input of second process level, by that analogy, the output of N number of process level connects the input of utilization system, and each process level structure can be identical with shown in Fig. 1 or Fig. 2 or Fig. 3; When measuring equipment need be connected, the output of N number of process level is connected to optical attenuator and is damaged (measuring luminous power numerical value with light power meter) by high power laser light to avoid measuring equipment, the output of optical attenuator connects optical receiver input, and the electric output port of optical receiver connects oscilloscope.Adjustable optical attenuator before resonance-amplifier from the change of pulse amplitude on observation oscilloscope, until reach minimum from pulse amplitude, now, the laser composition of continous-stable is normally amplified by fiber amplifier, and self mode locking pulse is limited to amplify even approximate not amplification, compressed so whole structure is exactly self mode locking pulse.In order to observe the effect using modified node method, the output of whole system is connected to adjustable optical attenuator, and the output of adjustable optical attenuator is connected to a spectroanalysis instrument, from the performance that range stability and the signal to noise ratio confirmation of spectral signal improve.
Claims (5)
1. a structure for squeezed light fibre laser self mode locking pulse, is characterized in that, described structure between output and the utilization system of fiber laser or the input of measuring equipment, is connected the process level comprising fiber amplifier and adjustable optical attenuator form.
2. the structure of squeezed light fibre laser self mode locking according to claim 1 pulse, is characterized in that, described process level is by the two-stage of connecting or be no less than two-stage series connection and form.
3. the structure of squeezed light fibre laser self mode locking according to claim 1 and 2 pulse, is characterized in that, in described process level, the input of fiber amplifier connects adjustable optical attenuator, and optical fiber laser output end connects the input of adjustable optical attenuator.
4. the structure of squeezed light fibre laser self mode locking according to claim 1 and 2 pulse, it is characterized in that, in described process level, the input of adjustable optical attenuator connects the output of optical band pass filter, and optical fiber laser output end connects the input of optical band pass filter.
5. the structure of squeezed light fibre laser self mode locking according to claim 1 and 2 pulse, is characterized in that, in described process level, optical band pass filter input connects the output of optical isolator, and optical fiber laser output end connects the input of optical isolator.
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Citations (5)
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| 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 |
| US20080232407A1 (en) * | 2000-05-23 | 2008-09-25 | Imra America, Inc. | Utilization of yb: and nd: mode-locked oscillators in solid-state short pulse laser 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 |
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2015
- 2015-05-26 CN CN201510271036.8A patent/CN104836104B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080232407A1 (en) * | 2000-05-23 | 2008-09-25 | Imra America, Inc. | Utilization of yb: and nd: mode-locked oscillators in solid-state short pulse laser system |
| 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 |
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| 梁建中等: "自锁模掺镱光纤激光器研究", 《中国激光》 * |
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