CN203056359U - Nanosecond optical fiber laser device with high pulse contrast - Google Patents
Nanosecond optical fiber laser device with high pulse contrast Download PDFInfo
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- CN203056359U CN203056359U CN 201320079291 CN201320079291U CN203056359U CN 203056359 U CN203056359 U CN 203056359U CN 201320079291 CN201320079291 CN 201320079291 CN 201320079291 U CN201320079291 U CN 201320079291U CN 203056359 U CN203056359 U CN 203056359U
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Abstract
The utility model discloses a nanosecond optical fiber laser device with high pulse contrast. The device comprises a plump laser, a beam combiner, a gain optical fiber, an optical fiber annular mirror and a fiber bragg grating, lasers in the optical fiber annular mirror which spread in clockwise and anti-clockwise directions along an optical fiber circle interfere mutually at an output port, the change of the beam splitting ratio of a coupler can change the watt levels of transmission light and reflected light, and the optical fiber annular mirror and the fiber bragg grating jointly form a resonant cavity. The nanosecond optical fiber laser device with high pulse contrast is compact in structure, good in stability, fast in switching speed, and high in pulse contrast, no light leakage occurs when the device is used in occasions of marking and carving of sensitive materials, processed edges are clear, and the effects are relatively good.
Description
[technical field]
The utility model relates to a kind of nanosecond optical-fiber laser apparatus of high impulse contrast, belongs to laser technology field.
[background technology]
Single pulse energy is widely used in electronics, clothes, chip manufacturing field at the nanosecond laser pulses of the burnt magnitude of milli, especially beat occasions such as coloured silk, flexible ceramic boring at the golden plastic cement stripping of sensitivity lacquer, stainless steel, particularly urgent to the demand of high impulse contrast nanosecond optical-fiber laser.The ps pulsed laser and ns pulsed laser device that the current industrial manufacture field is commonly used mainly contains two big classes: acousto-optic Q modulation ps pulsed laser and ns pulsed laser device and the main MOPA structure pulse laser that amplifies of seed source vibration.
Acousto-optic Q modulation ps pulsed laser and ns pulsed laser device technology maturation, the occupation rate of market height, but be subject to transmitance and the response speed of Q switching, the pulse time domain is asymmetric, trailing edge has the hangover of hundreds of nanoseconds, still have the light leak about 100mW under the laser shutdown state, be used for sensitive material and add the edge blurry in man-hour, image has ghost image.Existing Q switching is actually at the body acousto-optic crystal increases the optical fiber coupling, is not strict full optical fibre device, and under the long-term work state, coupled fiber and crystal junction are aging easily, and the long-time stability of acoustooptic Q-switching still need be improved.
The ps pulsed laser and ns pulsed laser utensil of MOPA structure has pulse duration and adjustable repetitive frequency humorous, advantage such as pulse shape is controlled, and the parameter adjustable extent is big, but because the power output of semiconductor seed source is little, generally need to adopt the structure of a plurality of amplifier cascades, cost height, system's relative complex.In multistage amplification process, be easy to generate the amplified spont-aneous emission noise, cause direct current light background, deterioration pulse contrast causes the pulse distortion.Simultaneously, some nonlinear effects relevant with length in the optical fiber, as stimulated Raman scattering, also the increase with optical fiber link strengthens, when serious even burn out optical fiber.
Therefore, be necessary to solve as above problem.
[utility model content]
The utility model has overcome the deficiency of above-mentioned technology, a kind of nanosecond optical-fiber laser apparatus of high impulse contrast is provided, be connected to form laserresonator in turn by fiber grating, gain fibre, fiber loop mirror, by changing fiber loop mirror fiber turns polarization state, obtain the resonant cavity that output is more adjustable than flexibly, pulse duration is variable, realize the nanosecond laser output of high impulse contrast, it has compact conformation, the time domain hangover is little, the advantage that long-time stability are good.
For achieving the above object, the utility model has adopted following technical proposal:
A kind of nanosecond optical-fiber laser apparatus of high impulse contrast, include pump laser 2, the pulse modulated circuit 1 that is used for driving the required pump light of pump laser 2 outputs that is connected with pump laser 2, the fiber grating 4 of antiradar reflectivity, gain fibre 5 for generation of the required population inversion of laser gain, and has the saturated absorption effect for the fiber loop mirror 6 of edge hangover behind the suppressor pulse, described fiber grating 4 is connected to form laserresonator by gain fibre 5 and fiber loop mirror 6, also be provided with on the laserresonator for the bundling device 3 that the pump light coupling of pump laser 2 is injected laserresonator, described bundling device 3 is provided with one and closes Shu Duan, one pump light input and a signal incident end, described pump laser 2 outputs are connected with bundling device 3 pump light inputs.
As optimizing embodiment, described bundling device 3 is arranged on fiber grating 4 away from an end of fiber loop mirror 6, and the Shu Duanyu fiber grating 4 that closes of bundling device 3 connects, and the signal incident end of bundling device 3 is as the nanosecond pulse output.
As optimizing embodiment, described bundling device 3 is arranged between fiber grating 4 and the gain fibre 5, the Shu Duanyu gain fibre 5 that closes of bundling device 3 connects, and the signal incident end of bundling device 3 is connected with fiber grating 4, and fiber grating 4 other ends are as the nanosecond pulse output.
As optimizing embodiment, also be provided with the fiber coupler 9 for coupling output between described gain fibre 5 and the fiber loop mirror 6, described fiber coupler 9 is provided with an input, a high coupling ratio output and a low coupling ratio output, the input of fiber coupler 9 is connected with fiber loop mirror 6, the high coupling ratio output of fiber coupler 9 is connected with gain fibre 5, and the low coupling ratio output of fiber coupler 9 is as the nanosecond pulse output.
As optimization, described fiber loop mirror 6 adopts directed fiber coupler, and described fiber coupler two output ports are joined together to form the loop part of fiber loop mirror 6.
As optimization, the optical fiber 7 of nonlinear effect intensity and the polarization state that is used for changing in the chamber change the pulse duration of output pulse and the Polarization Controller 8 of power in the loop of fiber loop mirror 6 part also is provided with for increasing the chamber.
Single mode or double clad gain fibre that aforesaid gain fibre 5 is the doped rare earth element ion.
Compared with prior art, the beneficial effects of the utility model are:
1, fiber loop mirror is full optical fibre device, and the insertion loss is little, dependable performance.
2, the pumping pulse of microsecond magnitude is in the gain modulation effect of gain fibre, and the acting in conjunction of fiber loop mirror saturated absorption effect, obtains the nanosecond pulse that pulsewidth is narrower, threshold value is lower, contrast is higher.
3, the opposite two-beam ripple in the direction of propagation interferes effect at the fiber loop mirror output port in the fiber turns, and the pulse trailing edge is more precipitous, and the time domain hangover is little.
4, change the coupling ratio of fiber coupler, perhaps change the fiber turns polarization state of annular mirror, change the switching time of the reflection of fiber loop mirror and transmissivity, fiber loop mirror etc. thereupon, and it is more adjustable than flexibly to obtain output, the resonant cavity that pulse duration is variable.
[description of drawings]
Fig. 1 is embodiment 1 structure principle chart of the present utility model.
Fig. 2 is embodiment 2 structure principle charts of the present utility model.
Fig. 3 is embodiment 3 structure principle charts of the present utility model.
[embodiment]
Be described in further detail by the utility model feature of embodiment and other correlated characteristic below in conjunction with accompanying drawing, so that technical staff's of the same trade understanding:
Embodiment 1:
As shown in Figure 1, a kind of nanosecond optical-fiber laser apparatus of high impulse contrast includes pulse modulated circuit 1, pump laser 2, bundling device 3, fiber grating 4, gain fibre 5 and fiber loop mirror 6.
Described pump laser 2 is semiconductor laser, and centre wavelength is corresponding with the absorption line of gain fibre 5.
Described bundling device 3 is wavelength division multiplexer or high power bundling device.
Single mode or double clad gain fibre that described gain fibre 5 is the doped rare earth element ion.
The fiber turns loop part that described fiber loop mirror 6 comprises a directed fiber coupler and is joined together to form by these coupler two output ports, coupler are that splitting ratio draws tapered full optical fibre device arbitrarily.
Interfere mutually at output port with the laser of counterclockwise propagating in a clockwise direction along fiber turns loop part in the fiber loop mirror 6, change the splitting ratio of directed fiber coupler, can change transmitted light and catoptrical watt level.Fiber loop mirror 6 compact conformations, dependable performance, easily be connected with optical fiber, be equivalent to output than adjustable laser resonant cavity speculum.Nonlinear optical fiber annular mirror is equivalent to saturated absorbing body, and its response speed is fast, is applied to the laser that laser can produce the high impulse contrast.
Under the driving of pulse modulated circuit 1, pump laser 2 produces time domain width microsecond magnitude, the pump light that centre wavelength is corresponding with the absorption line of gain fibre 5, pump light is through bundling device 3, see through fiber grating 4, be coupled to gain fibre 5, gain fibre 5 automodulations produce small-pulse effect, directed fiber coupler by fiber loop mirror 6 enters fiber turns, the light wave that enters fiber turns is divided into transmission in opposite direction, the discrepant two-beam of intensity, the light path of this two-beam in optical fiber is identical, but owing to modulate from phase place in the optical fiber, the nonlinear phase shift difference that nonlinear effects such as cross-phase modulation cause, two-beam produces coherent interference in directed fiber coupler, be equivalent to saturable absorbing mirror.Light wave through gain fibre 5, incides fiber grating 4 after fiber loop mirror 6 reflections.Adopt the lower fiber grating 4 of reflectivity, part laser is from fiber grating 4 transmissions, through bundling device 3, from the signal incident end output of bundling device 3.Fiber grating 4 and fiber loop mirror 6 are equivalent to two chamber mirrors, form laserresonator; Gain fibre 5 is under the effect of impulse type pump light, and the effect of its gain modulation is equivalent to optical switch, forms pulse output.Employing has the fiber loop mirror 6 of saturated absorption effect as a chamber mirror of resonant cavity, along the generation of hangover, obtains the nanosecond pulse of high impulse contrast behind the energy suppressor pulse.
Embodiment 2:
As shown in Figure 2, a kind of nanosecond optical-fiber laser apparatus of high impulse contrast includes pulse modulated circuit 1, pump laser 2, bundling device 3, fiber grating 4, gain fibre 5 and fiber loop mirror 6.
Described pump laser 2 is semiconductor laser, and centre wavelength is corresponding with gain fibre 5 gain media absorption lines.
Described bundling device 3 is wavelength division multiplexer or high power bundling device.
Single mode or double clad gain fibre that described gain fibre 5 is the doped rare earth element ion.
The fiber turns loop part that described fiber loop mirror 6 comprises a directed fiber coupler and is joined together to form by these coupler two output ports, coupler are that splitting ratio draws tapered full optical fibre device arbitrarily.
Under the driving of pulse modulated circuit 1, pumping half laser 2 produces time domain width microsecond magnitude, the pump light that centre wavelength is corresponding with gain fibre 5 gain media absorption lines, pump light is through bundling device 3, be coupled to gain fibre 5, the gain fibre spontaneous radiation produces small-pulse effect, enter into fiber turns by directed fiber coupler on the fiber loop mirror 6, the light wave that enters fiber turns is divided into transmission, the discrepant two-beam of intensity in opposite direction.The light path of this two-beam in optical fiber is identical, but because the nonlinear phase shift difference that causes from nonlinear effects such as phase place modulation, cross-phase modulation in the optical fiber, two-beam produces coherent interference in directed fiber coupler, be equivalent to the nonlinear optical switch.Light wave successively passes through gain fibre 5, bundling device 3 after fiber loop mirror 6 reflections, incide fiber grating 4.Fiber grating 4 and fiber loop mirror 6 are equivalent to two chamber mirrors, form laserresonator; Gain fibre 5 is under the effect of impulse type pump light, and the effect of its gain modulation is equivalent to optical switch, forms pulse output.Employing has the fiber loop mirror 6 of saturated absorption effect as a chamber mirror of resonant cavity, along the generation of hangover, obtains the nanosecond pulse of high impulse contrast behind the energy suppressor pulse.
Embodiment 3:
As shown in Figure 3, a kind of nanosecond optical-fiber laser apparatus of high impulse contrast includes pulse modulated circuit 1, pump laser 2, bundling device 3, fiber grating 4, gain fibre 5, fiber loop mirror 6, optical fiber 7, Polarization Controller 8, fiber coupler 9.
Described pump laser 2 is semiconductor laser, and centre wavelength is corresponding with gain fibre 5 gain media absorption lines.
Described bundling device 3 is wavelength division multiplexer or high power bundling device.
Single mode or double clad gain fibre that described gain fibre 5 is the doped rare earth element ion.
The fiber turns loop part that described fiber loop mirror 6 comprises a directed fiber coupler and is joined together to form by these coupler two output ports, coupler is that splitting ratio draws tapered full optical fibre device arbitrarily, optical fiber 7 and Polarization Controller 8 are arranged on fiber turns loop part, Polarization Controller is manual or electronic control type device, and the polarization state that changes in the chamber changes pulse duration and the power of exporting pulse.
Under the driving of pulse modulated circuit 1, pump laser 2 produces time domain width microsecond magnitude, the pump light that centre wavelength is corresponding with gain fibre 5 gain media absorption lines, pump light is coupled to gain fibre 5 through bundling device 3, gain fibre 5 spontaneous radiations, produce small-pulse effect, through coupler 9, fiber loop mirror 6, enter into fiber turns loop part, the light wave that enters fiber turns is divided into transmission, the discrepant two-beam of intensity in opposite direction.The light path of this two-beam in optical fiber is identical, but because the nonlinear phase shift difference that causes from nonlinear effects such as phase place modulation, cross-phase modulation in the optical fiber, two-beam produces coherent interference in directed fiber coupler, be equivalent to non-linear saturated absorbing body.Optical fiber 7 in the fiber turns works to increase nonlinear effect intensity in the chamber, regulate Polarization Controller 8, change the polarization state in the chamber, can regulate in the fiber turns along phase difference clockwise and the counter clockwise direction propagates light, final pulse duration and the power of exporting pulse that changes.Light wave is through fiber loop mirror 6 reflections, and part is from the end output of coupler 9 low coupling ratios, and another part is through an end of coupler 9 high coupling ratios, again successively through gain fibre 5, another beam splitting end of bundling device 3 incides fiber grating 4, is reflected by fiber grating 4.Fiber grating 4 and fiber loop mirror 6 are equivalent to two chamber mirrors, form laserresonator; Gain fibre 5 is under the effect of impulse type pump light, and the effect of its gain modulation is equivalent to optical switch, forms pulse output.Employing has the fiber loop mirror 6 of saturated absorption effect as a chamber mirror of resonant cavity, along the generation of hangover, obtains the nanosecond pulse of high impulse contrast behind the energy suppressor pulse.
As mentioned above; what the utility model was protected is a kind of nanosecond optical-fiber laser apparatus of high impulse contrast; fiber grating 4 is connected to form laserresonator by gain fibre 5 and fiber loop mirror 6; by changing fiber loop mirror 6 fiber turns polarization states; obtain the resonant cavity that output is more adjustable than flexibly, pulse duration is variable, realize the nanosecond laser output of high impulse contrast, it has compact conformation; the time domain hangover is little, the advantage that long-time stability are good.The technical scheme that all or this case embodiments identical with this case structure are equal to replacement all should be shown in the protection range that falls into this case.
Claims (9)
1. the nanosecond optical-fiber laser apparatus of a high impulse contrast, it is characterized in that: include pump laser (2), the pulse modulated circuit (1) that is used for driving the required pump light of pump laser (2) output that is connected with pump laser (2), the fiber grating of antiradar reflectivity (4), gain fibre (5) for generation of the required population inversion of laser gain, and has the saturated absorption effect for the fiber loop mirror (6) of edge hangover behind the suppressor pulse, described fiber grating (4) is connected to form laserresonator by gain fibre (5) and fiber loop mirror (6), also be provided with on the laserresonator for the bundling device (3) that the pump light coupling of pump laser (2) is injected laserresonator, described bundling device (3) is provided with one and closes Shu Duan, one pump light input and a signal incident end, described pump laser (2) output is connected with bundling device (3) pump light input.
2. the nanosecond optical-fiber laser apparatus of a kind of high impulse contrast according to claim 1, it is characterized in that described bundling device (3) is arranged on fiber grating (4) away from an end of fiber loop mirror (6), the Shu Duanyu fiber grating (4) that closes of bundling device (3) connects, and the signal incident end of bundling device (3) is as the nanosecond pulse output.
3. the nanosecond optical-fiber laser apparatus of a kind of high impulse contrast according to claim 1, it is characterized in that described bundling device (3) is arranged between fiber grating (4) and the gain fibre (5), the Shu Duanyu gain fibre (5) that closes of bundling device (3) connects, the signal incident end of bundling device (3) is connected with fiber grating (4), and fiber grating (4) other end is as the nanosecond pulse output.
4. the nanosecond optical-fiber laser apparatus of a kind of high impulse contrast according to claim 1, it is characterized in that also being provided with between described gain fibre (5) and the fiber loop mirror (6) fiber coupler (9) for coupling output, described fiber coupler (9) is provided with an input, one high coupling ratio output and a low coupling ratio output, the input of fiber coupler (9) is connected with fiber loop mirror (6), the high coupling ratio output of fiber coupler (9) is connected with gain fibre (5), and the low coupling ratio output of fiber coupler (9) is as the nanosecond pulse output.
5. the nanosecond optical-fiber laser apparatus of a kind of high impulse contrast according to claim 1, it is characterized in that described fiber loop mirror (6) adopts directed fiber coupler, described fiber coupler two output ports are joined together to form the loop part of fiber loop mirror (6).
6. the nanosecond optical-fiber laser apparatus of a kind of high impulse contrast according to claim 5 is characterized in that the optical fiber (7) of nonlinear effect intensity in the loop part of fiber loop mirror (6) also is provided with for increasing the chamber and the polarization state that is used for changing in the chamber change the pulse duration of output pulse and the Polarization Controller (8) of power.
7. the nanosecond optical-fiber laser apparatus of a kind of high impulse contrast according to claim 1 is characterized in that described pump laser (2) is semiconductor laser.
8. the nanosecond optical-fiber laser apparatus of a kind of high impulse contrast according to claim 1 is characterized in that described bundling device (3) is wavelength division multiplexer or high power bundling device.
9. the nanosecond optical-fiber laser apparatus of a kind of high impulse contrast according to claim 1 is characterized in that described gain fibre (5) is the single mode of doped rare earth element ion or double clad gain fibre.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320079291 CN203056359U (en) | 2013-02-20 | 2013-02-20 | Nanosecond optical fiber laser device with high pulse contrast |
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| CN 201320079291 CN203056359U (en) | 2013-02-20 | 2013-02-20 | Nanosecond optical fiber laser device with high pulse contrast |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166094A (en) * | 2013-02-20 | 2013-06-19 | 广东汉唐量子光电科技有限公司 | High-pulse-contrast-ratio nanosecond fiber laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166094A (en) * | 2013-02-20 | 2013-06-19 | 广东汉唐量子光电科技有限公司 | High-pulse-contrast-ratio nanosecond fiber laser |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: ZHONGSHAN HANTONG LASER SCIENCE CO., LTD. Assignor: Guangdong Hantang Quantum Photoelectric Technology Co., Ltd. Contract record no.: 2015440000154 Denomination of utility model: Nanosecond optical fiber laser device with high pulse contrast Granted publication date: 20130710 License type: Exclusive License Record date: 20150521 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160511 Address after: 528400 Zhongshan Province Torch Development Zone, Guangdong Road, No. 6 Patentee after: Guangdong Hantang Quantum Photoelectric Technology Co., Ltd. Patentee after: ZHONGSHAN HANTONG LASER SCIENCE CO., LTD. Patentee after: GUANGDONG HANBANG 3D TECHNOLOGY CO., LTD. Address before: 528400 Zhongshan Province Torch Development Zone, Guangdong Road, No. 6 Patentee before: Guangdong Hantang Quantum Photoelectric Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20180220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |