CN203367740U - High-power linearly polarized laser output optical fiber amplifier - Google Patents
High-power linearly polarized laser output optical fiber amplifier Download PDFInfo
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- CN203367740U CN203367740U CN2013204221907U CN201320422190U CN203367740U CN 203367740 U CN203367740 U CN 203367740U CN 2013204221907 U CN2013204221907 U CN 2013204221907U CN 201320422190 U CN201320422190 U CN 201320422190U CN 203367740 U CN203367740 U CN 203367740U
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Abstract
The utility model discloses a high-power linearly polarized laser output optical fiber amplifier. The optical fiber amplifier comprises an optoisolator, a pump beam combiner, a doubly clad active optical fiber, an optical power beam splitting device, an optical fiber collimator, a polarizer, a pump laser and a pump laser driving control circuit. The polarizer is provided with main and auxiliary polarization axis output ends. The microprocessor of the pump laser driving control circuit is connected with the pump driving circuit, the pump driving circuit is connected with the pump laser, and both of a first photoelectric detector connected with the optical power beam splitting device and a second photoelectric detector connected with the auxiliary polarization axis output port are connected with the microprocessor. During utilization, the insertion loss of the main and auxiliary polarization axes is acquired and stored at first; the total power and the output power of the auxiliary polarization axis is detected through the two photoelectric detectors, and when the polarization state is changed, the pump driving current is changed correspondingly, and the total amplifier output power is adjusted. According to the utility model, the constant main polarization axis laser power output can be realized, and no environmental factor influence exists.
Description
Technical field
The utility model relates to a kind of fiber amplifier, is specifically related to a kind of be applied to main oscillations laser amplifier structure (MOPA) fiber laser final stage, firm power output, high power line polarization laser output optical fibre amplifier.
Background technology
The advantages such as high-capacity optical fiber laser is simple with its radiating mode, compact conformation, power output is large, power density is high and the life-span is long, have a wide range of applications in fields such as space field, Precision Machining, laser radar, laser ranging, laser medicines.Wherein, adopt the linear polarization high-capacity optical fiber laser of main oscillations laser amplification technique owing to thering is linear polarization high-power output characteristic, very popular in some special laser application technique field.Yet, because fiber laser or fiber amplifier easily are subject to the impact of the environmental factors such as vibration, STRESS VARIATION and variations in temperature, the laser polarization state has randomness and changes, and makes power output under the single polarization state of laser larger fluctuation occur.
The utility model content
The shortcoming that current main oscillations laser amplifier structure linear polarization fiber ring laser system polarization stability is poor in order to overcome, Output of laser plays partially rear power stability degradation, the utility model provides a kind of final stage fiber amplifier that can make the MOPA structured optical fiber laser of fiber laser stable output linearly polarized laser, it is high power line polarization laser output optical fibre amplifier
The starting point of the utility model technical solution problem is: by output gross power and the polarization state amplitude of variation of monitor optical fiber amplifier, regulate the pump laser power of fiber amplifier, the compensated fiber amplifier plays the power variation that the polarization state after inclined to one side output causes, makes the laser power stability of main polarization axis direction on set point.
There are fixing proportionate relationship in the laser power of luminous power light-splitting device output and fiber amplifier output gross power, and the laser power of monitoring optical power light-splitting device output just can obtain the output gross power of fiber amplifier; By the secondary axis of polarization polarization laser of monitoring polarizer power output, by gross power, deduct the power output that secondary axis of polarization polarization laser power output has just obtained main axis of polarization polarization laser again; Finally by regulating fiber amplifier pump laser drive current, change pump laser power, change because of polarization state the main axis of polarization polarization laser output-power fluctuation caused with the compensated fiber amplifier, obtain the main axis of polarization polarization laser output of firm power.
The high power line polarization laser output optical fibre amplifier that the utility model is designed, comprise optical isolator, pump combiner, double-cladding active optical fiber, optical fiber collimator, the polarizer, pump laser and pump laser Drive and Control Circuit, the laser signal of input accesses the signal input part of pump combiner after optical isolator, the pumping input of pump laser access pump combiner, the common output by pump combiner enters double-cladding active optical fiber and is amplified, the output incoming fiber optic collimater of double-cladding active optical fiber, the output access polarizer of optical fiber collimator, the polarizer has Principal State of Polarization Laser output port and the secondary polarization state Laser output port of quadrature with it, the former exports main axis of polarization polarization laser, the latter exports secondary axis of polarization polarization laser.The pump laser Drive and Control Circuit connects pump laser, controls its power output.This fiber amplifier also includes the luminous power light-splitting device, the output access luminous power light-splitting device of double-cladding active optical fiber, an output incoming fiber optic collimater of luminous power light-splitting device, another output of luminous power light-splitting device---optical power monitoring output, connect the first photodetector, the amplifier gross power of monitoring optical fiber collimator output.The secondary polarization state Laser output port of the polarizer connects the second photodetector, the secondary axis of polarization polarization laser of monitoring polarizer power output.
Described pump laser Drive and Control Circuit comprises pumping drive circuit, the first photodetector, the second photodetector and microprocessor, the output of pumping drive circuit connects pump laser, the signal output part of the first and second photodetectors all is connected with microprocessor or arithmetic control circuit signal input part, the control end of the output termination pumping drive circuit of microprocessor or arithmetic control circuit.The operating state of pumping drive circuit is controlled by microprocessor.
Described luminous power light-splitting device is fiber optic splitter independently, or dependent light-splitting device.Dependent light-splitting device is the optical fiber that is wound in double-cladding active optical fiber of leakage laser power, or for revealing the vacant pumping tail optical fiber of pump combiner of laser power.
The input laser signal is continuous laser signal or pulsed laser signal, and fiber amplifier of the present utility model can be the continuous laser amplifier, can be also impulse laser amplifier.
This fiber amplifier is in the situation that good work of heat radiation.
Operation wavelength and the power output of described optical isolator and fiber amplifier are complementary.
Output optical fibre and the operation wavelength of described optical fiber collimator and fiber amplifier are complementary.
The described polarizer and fiber amplifier operation wavelength are complementary.
Described pump combiner is (n+1) * 1 pump combiner, and its operation wavelength is consistent with fiber amplifier operation wavelength and pump power, the pumping input port that wherein n is pump combiner, and n is more than or equal to 2.
The high-power multimode laser diode that described pump laser is N output side optical fiber formula, N≤n.
The active gain medium of described double-cladding active optical fiber doping is ytterbium ion (Yb
3+), erbium ion (Er
3+), erbium and ytterbium codoping, neodymium ion (Nd
3+) in any, according to the fiber amplifier operation wavelength, select.
Described optical isolator, pump combiner, double-cladding active optical fiber, luminous power light-splitting device, optical fiber collimator are guarantor's polarizing device, or are non-guarantor's polarizing device.
The utility model high power line polarization laser output optical fibre amplifier first carries out system initialization while using, obtaining light power meter mensuration collimation power output is gross power P, and records luminous power light-splitting device monitor power value P by the first photodetector
1, calculate the two ratio A=P
1/ P.The second photodetector detects secondary axis of polarization polarization laser power output P
2.And the insertion loss percentage m of the main axis of polarization polarization laser of acquisition polarizer Principal State of Polarization Laser output port
1insertion loss percentage m with the secondary axis of polarization polarization laser of secondary polarization state Laser output port
2.The input laser signal identical with initialization during startup, according to A and m
1, m
2, the first photoelectric detector records the luminous power P of luminous power light-splitting device
1, the second photoelectric detector records secondary axis of polarization polarization laser power output P
2, calculate main axis of polarization polarization laser power output, regulate the pump laser drive current, make this fiber amplifier master axis of polarization polarization laser power output reach set point P
f.During operation, when the fiber amplifier polarization state changes, secondary axis of polarization polarization laser power output Pm changes, and microprocessor or arithmetic control circuit are according to current P
1, P
2, calculating the linearly polarized laser power output Pout that keeps main polarization axle constant is P
f, required current total power P
1/ A is worth accordingly, and the pump laser driving current value of corresponding change is transported to the pumping drive circuit, changes the gross power P of the current output of pump laser, makes main axis of polarization polarization laser stable output power at set point P
f.
Compared with prior art, the beneficial effect of the utility model high power line polarization laser output optical fibre amplifier is: 1, the impact of the environmental factor such as not vibrated, STRESS VARIATION and variations in temperature has overcome the shortcoming that high-power fiber amplifier linearly polarized laser Output of laser power stability can't guarantee; 2, according to the size of fiber amplifier master polarization axle and secondary axis of polarization polarization laser power output, realize FEEDBACK CONTROL, and make fiber amplifier master polarization axle laser constant power output by regulating the pump laser drive current; 3, can compensate the main polarization axle laser output power fluctuation that the fluctuation within a narrow range of input laser signal power causes; 4, be applicable to the amplification of multi-wavelength's laser signal.
The accompanying drawing explanation
Fig. 1 is this high power line polarization laser output optical fibre amplifier embodiment light channel structure schematic diagram.
The pump laser Drive and Control Circuit structural representation that Fig. 2 is this high power line polarization laser output optical fibre amplifier embodiment.
Embodiment
This high power line polarization laser output optical fibre amplifier light channel structure as shown in Figure 1, comprise optical isolator, pump combiner, double-cladding active optical fiber, the luminous power light-splitting device, optical fiber collimator, the polarizer, pump laser and pump laser Drive and Control Circuit, the laser signal of input accesses the signal input part of pump combiner after optical isolator, the pumping input of pump laser access pump combiner, the common output by pump combiner enters double-cladding active optical fiber and is amplified, the output incoming fiber optic beam splitter of double-cladding active optical fiber, an output incoming fiber optic collimater of fiber optic splitter, the output access polarizer of optical fiber collimator, the polarizer has Principal State of Polarization Laser output port and the secondary polarization state Laser output port of quadrature with it, the former exports main axis of polarization polarization laser, latter's output and secondary axis of polarization polarization laser.The pump laser Drive and Control Circuit connects pump laser, controls its power output.
Another output of fiber optic splitter---the optical power monitoring output connects the first photodetector.The secondary polarization state Laser output port of the polarizer is connected to the second photodetector.
This routine pump laser Drive and Control Circuit as shown in Figure 2, comprise pumping drive circuit, the first photodetector, the second photodetector and microprocessor, the output of pumping drive circuit connects pump laser, the signal output part of first, second photodetector all is connected with the microprocessor signals input, the control end of the output termination pumping Drive and Control Circuit of microprocessor.
Operation wavelength and the power output of this routine optical isolator and fiber amplifier are complementary.
Output optical fibre and the operation wavelength of this routine optical fiber collimator and fiber amplifier are complementary.
This routine polarizer and fiber amplifier operation wavelength are complementary.
This routine pump combiner is (6+1) * 1 pump combiner, and its operation wavelength is consistent with fiber amplifier operation wavelength and pump power, and pump combiner has 6 pumping input ports.
The high-power multimode laser diode LD that this routine pump laser is 6 output side optical fiber formulas.
This routine active gain medium is ytterbium ion (Yb
3+), can select the active gain medium of doping according to the fiber amplifier operation wavelength is erbium ion (Er
3+), erbium and ytterbium codoping, neodymium ion (Nd
3+) etc. in any double-cladding active optical fiber.
This example input laser signal is 2W, and the main axis of polarization polarization laser power output of setting after amplifying is 50W, and real income Pout fluctuates in 0.5%.
Above-described embodiment, be only the specific case that the purpose of this utility model, technical scheme and beneficial effect are further described, and the utility model not is defined in this.All any modifications of making, be equal to replacement, improvement etc., within all being included in protection range of the present utility model within scope of disclosure of the present utility model.
Claims (8)
1. high power line polarization laser output optical fibre amplifier, comprise optical isolator, pump combiner, double-cladding active optical fiber, optical fiber collimator, the polarizer, pump laser and pump laser Drive and Control Circuit, laser signal accesses the signal input part of pump combiner after optical isolator, the pumping input of pump laser access pump combiner, the common output by pump combiner enters double-cladding active optical fiber and is amplified, the output incoming fiber optic collimater of double-cladding active optical fiber, the output access polarizer of optical fiber collimator, the pump laser Drive and Control Circuit connects pump laser, it is characterized in that:
The described polarizer has Principal State of Polarization Laser output port and the secondary polarization state Laser output port of quadrature with it, and the former exports main axis of polarization polarization laser, latter's output and secondary axis of polarization polarization laser; Also comprise the luminous power light-splitting device, the output access luminous power light-splitting device of double-cladding active optical fiber, an output incoming fiber optic collimater of luminous power light-splitting device, another output of luminous power light-splitting device---the optical power monitoring output connects the first photodetector; The secondary polarization state Laser output port of the polarizer connects the second photodetector;
Described pump laser Drive and Control Circuit comprises pumping drive circuit, the first photodetector, the second photodetector and microprocessor, the output of pumping drive circuit connects pump laser, the signal output part of the first and second photodetectors all is connected with the signal input part of microprocessor or arithmetic control circuit, the control end of the output termination pumping drive circuit of microprocessor or arithmetic control circuit.
2. high power line polarization laser output optical fibre amplifier according to claim 1 is characterized in that:
The laser signal of described input is the continuous laser signal, or pulsed laser signal.
3. high power line polarization laser output optical fibre amplifier according to claim 1 is characterized in that:
Described luminous power light-splitting device is fiber optic splitter independently, or dependent light-splitting device.
4. high power line polarization laser output optical fibre amplifier according to claim 3 is characterized in that:
Described dependent light-splitting device is the optical fiber that is wound in double-cladding active optical fiber of leakage laser power, or for revealing the vacant pumping tail optical fiber of pump combiner of laser power.
5. high power line polarization laser output optical fibre amplifier according to claim 1 is characterized in that:
Operation wavelength and the power output of described optical isolator and fiber amplifier are complementary;
Output optical fibre and the operation wavelength of described optical fiber collimator and fiber amplifier are complementary;
The described polarizer and fiber amplifier operation wavelength are complementary.
6. high power line polarization laser output optical fibre amplifier according to claim 1 is characterized in that:
Described pump combiner is (n+1) * 1 pump combiner, and its operation wavelength is consistent with fiber amplifier operation wavelength and pump power, the pumping input port that wherein n is pump combiner, and n is more than or equal to 2.
7. high power line polarization laser output optical fibre amplifier according to claim 4 is characterized in that:
The high-power multimode laser diode (LD) that described pump laser is N output side optical fiber formula, N≤n.
8. high power line polarization laser output optical fibre amplifier according to claim 1 is characterized in that:
Described optical isolator, pump combiner, double-cladding active optical fiber, luminous power light-splitting device and optical fiber collimator are guarantor's polarizing device, or are non-guarantor's polarizing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204221907U CN203367740U (en) | 2013-07-16 | 2013-07-16 | High-power linearly polarized laser output optical fiber amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204221907U CN203367740U (en) | 2013-07-16 | 2013-07-16 | High-power linearly polarized laser output optical fiber amplifier |
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|---|---|
| CN203367740U true CN203367740U (en) | 2013-12-25 |
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|---|---|---|---|
| CN2013204221907U Withdrawn - After Issue CN203367740U (en) | 2013-07-16 | 2013-07-16 | High-power linearly polarized laser output optical fiber amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368047A (en) * | 2013-07-16 | 2013-10-23 | 中国电子科技集团公司第三十四研究所 | High-power linear polarization laser output optical fiber amplifier and output control method |
| CN110718844A (en) * | 2019-10-12 | 2020-01-21 | 中国工程物理研究院激光聚变研究中心 | Laser energy stable amplification control device and control method |
-
2013
- 2013-07-16 CN CN2013204221907U patent/CN203367740U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368047A (en) * | 2013-07-16 | 2013-10-23 | 中国电子科技集团公司第三十四研究所 | High-power linear polarization laser output optical fiber amplifier and output control method |
| CN103368047B (en) * | 2013-07-16 | 2015-09-16 | 中国电子科技集团公司第三十四研究所 | High power line polarization laser output optical fibre amplifier and output control method |
| CN110718844A (en) * | 2019-10-12 | 2020-01-21 | 中国工程物理研究院激光聚变研究中心 | Laser energy stable amplification control device and control method |
| CN110718844B (en) * | 2019-10-12 | 2021-08-10 | 中国工程物理研究院激光聚变研究中心 | Laser energy stable amplification control device and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131225 Effective date of abandoning: 20150916 |
|
| RGAV | Abandon patent right to avoid regrant |