CN108155553A - Gain spectral band is switched fast and fine adjustable optical parametric oscillator - Google Patents
Gain spectral band is switched fast and fine adjustable optical parametric oscillator Download PDFInfo
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- CN108155553A CN108155553A CN201810004665.8A CN201810004665A CN108155553A CN 108155553 A CN108155553 A CN 108155553A CN 201810004665 A CN201810004665 A CN 201810004665A CN 108155553 A CN108155553 A CN 108155553A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/3536—Four-wave interaction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
It is switched fast the present invention relates to a kind of gain spectral band and fine adjustable optical parametric oscillator, the feedback light path formed including sequentially connected pumping source, Polarization Controller, photo-coupler, birefringence mode nonlinear dielectric, output coupler, output terminal and fixed delay line and adjustable delay line, being switched fast between polarization state realization two gain spectrals of SMI and XPMI of adjustable pump light, achievees the purpose that quick-speed large-scale adjusts output light wavelength；Using automatically controlled Polarization Controller, quick polarization control is realized, and then realize the quick adjusting of optical parametric oscillator output wavelength；Optical parametric oscillator can carry out output wavelength careful adjusting by adjustable parameter oscillator length；Delay of feedback causes feedback pulse time domain width to be more than pumping pulse, based on dispersion filter effect, realizes extremely narrow output spectrum by the effect of dispersion；Feedback light path improves the transfer efficiency of optical parametric oscillator；Optical fiber structure device can be used in the present invention, has the advantages that miniaturization.
Description
Technical field
The present invention relates to a kind of laser technology, more particularly to a kind of gain spectral band is switched fast and fine adjustable optical parameter
Oscillator.
Background technology
Optical parametric oscillator (OPO) is a kind of device for non-linear optical, it is using nonlinear dielectric as working media.Work
It is placed in resonator as medium, parameter transform process is generated under the action of pump light, and pass through the oscillation action shape of resonator
The laser for being different from pump light into wavelength exports.Optical parametric oscillator (OPO) is that the existing gain media output wavelength of solution cannot
The important means of all wave bands is completely covered, because its is compact in structure and convenient to use and power is high, it is all that wavelength cover is wide etc.
More advantages have been widely used in various scientific research fields.
Optical parametric oscillator (OPO) is mainly using pump light source wavelength regulation at present, nonlinear dielectric angular adjustment and non-
Linear medium temperature adjust etc. adjusting methods, the above method all there are it is respective the shortcomings that：Pump light source wavelength regulation is easy to cause
Laser losing lock needs to use special laser；Nonlinear dielectric angle adjustment mechanism complexity is difficult to realize；Nonlinear dielectric
Temperature adjusting is difficult to realize careful adjusting；Their common drawbacks are that the speed of wavelength shift is slow, and can not realize skip regulation.State
Carried out the research of voltage adjusting on border, this method governing speed quickly, but because being limited by existing material property, the tune of realization
Byte wide is very narrow, small more several than the optical parametric oscillator (OPO) that nonlinear dielectric angular adjustment and nonlinear dielectric temperature are adjusted
A order of magnitude.
Basic principle based on non-linear process, optical parameter process need to meet phase-matching condition, the polarization of pump light
State is closely related with phase-matching condition, adjusts the polarization state of pump light and can influence phase-matching condition.Therefore, pump light is adjusted
Polarization state can realize that the scalar of four-wave mixing in Fiber-optic parameter oscillator (OPO) modulates unstable (SMI) and Cross-phase Modulation
The switching of unstable (XPMI).Existing regulative mode is typically all to be adjusted in a determining gain spectral band, such as SMI, XPMI
Section, for certain applications for needing to be switched fast, governing speed is inadequate.
Invention content
The present invention be directed to present optical parametric oscillator there are the problem of, it is proposed that a kind of gain spectral band be switched fast and essence
Thin adjustable optical parametric oscillator adds a polarization regulating device in the pumping light input end of optical parametric oscillator (OPO),
Increase adjustable delay line in parametric oscillator, a kind of gain spectral band is provided and is switched fast and fine adjustable optical parametric oscillator.
The polarization state that pump light is adjusted by Polarization Controller realizes that gain spectral interband is switched fast in optical parametric oscillator, by can
Delay line is adjusted to realize fine-tuning in gain spectral band.
The technical scheme is that：A kind of gain spectral band is switched fast and fine adjustable optical parametric oscillator, including
Sequentially connected pumping source, Polarization Controller, photo-coupler, birefringence mode nonlinear dielectric, output coupler, output terminal and solid
Determine the feedback light path of delay line and adjustable delay line composition, pump light output light is through the Polarization Controller multiplex through photo-coupler again
End enters birefringent nonlinear medium, the polarization state of the pump light of Polarization Controller control input birefringent nonlinear medium, pump
Pu light is output to output coupler after birefringent nonlinear medium four-wave mixing, and output coupler one end connects output terminal by portion
Light splitting output, other end fixed delay line of ining succession feed back part light, and feedback light adjusts light echo coupler again through adjustable delay line,
Feedback light enters in birefringent nonlinear medium jointly with pump light through photo-coupler.
The Polarization Controller selection wave plate or optical fiber polarization controller.
The wavelength division multiplexer of the optical coupling selection optical fiber structure or the dichroscope of space structure.
Photonic crystal fiber replacement may be selected in the birefringent nonlinear medium, is sent out inside it under the action of pump light
Raw four-wave mixing effect, and light signal fed back is subjected to parameter amplification.
Fixed delay line in the feedback light path is using space optical path or the light being made of single mode optical fiber, polarization maintaining optical fibre
Fine light path, length are acquired according to the calculating of specific pump light repetition rate.
The beneficial effects of the present invention are：Gain spectral band of the present invention is switched fast and fine adjustable optical parametric oscillator,
The polarization state of adjustable pump light is realized between two gain spectrals of SMI and XPMI with to reach the phase-matching condition of SMI and XPMI
Be switched fast, achieve the purpose that quick-speed large-scale adjust output light wavelength；Automatically controlled Polarization Controller can be used, realize quick
Polarization Control, and then realize the quick adjusting of optical parametric oscillator output wavelength；The optical parametric oscillator of the present invention passes through adjusting
Parametric oscillator length can carry out output wavelength careful adjusting；The delay of feedback of the present invention is caused by the effect of dispersion
Feedback pulse time domain width is more than pumping pulse, based on dispersion filter effect, realizes extremely narrow output spectrum；The feedback of the present invention
Light path improves the transfer efficiency of optical parametric oscillator；Optical fiber structure device can be used in the present invention, has the advantages that miniaturization.
Description of the drawings
Fig. 1 is principle of the invention structure chart；
Fig. 2 is the gain band diagram in the corresponding optical parametric oscillator of different pumping polarization state of the present invention；
Fig. 3 is switched fast for one full fiber type gain spectral band of the embodiment of the present invention and fine adjustable optical parametric oscillator knot
Composition；
Fig. 4 is switched fast for two spatial mode gain spectral band of the embodiment of the present invention and fine adjustable optical parametric oscillator structure
Figure.
Specific embodiment
Gain spectral band as shown in Figure 1 is switched fast and fine adjustable optical parametric oscillator, oscillator include being sequentially connected
Pumping source 1, Polarization Controller 2, photo-coupler 3, birefringence mode nonlinear dielectric 4, output coupler 5, output terminal 6 and fixed
The feedback light path that delay line 7 and adjustable delay line 8 form, 1 output light of pump light is through Polarization Controller 2 again through photo-coupler 3
Multiplex end enters birefringent nonlinear medium 4, and pump light is output to output coupling after 4 four-wave mixing of birefringent nonlinear medium
Clutch 5,5 one end of output coupler connect output terminal 6 by part light output, and other end fixed delay line 7 of ining succession feeds back part light,
Feedback light adjusts light echo coupler 3 again through adjustable delay line 8, and feedback light enters birefringence jointly with pump light through photo-coupler 3
In nonlinear dielectric 4.Fig. 2 is respectively the gain spectral band in the corresponding optical parametric oscillator of pump light different polarization states, adjusts pump
The polarization state of Pu light can be switched fast the gain spectral band of the optical parametric oscillator of the present invention, reach the purpose of the present invention.
Pumping source 1 is the pulse laser of a linear polarization output.The control input birefringent nonlinear of Polarization Controller 2 is situated between
The polarization state of the pump light of matter 4.Wave plate may be used in Polarization Controller 2, and optical fiber polarization controller can also be used.
The wavelength division multiplexer of 3 available fiber structure of photo-coupler or the dichroscope of space structure, in the present invention
Effect is into birefringent nonlinear medium 4 by pump light and feedback light coupled in common.
Photonic crystal fiber can be used in birefringent nonlinear medium 4, and other that can generate nonlinear effect can also be used
Birefringent nonlinear medium, effect is four-wave mixing effect to occur under the action of pump light, and when having feedback,
Feedback signal is subjected to parameter amplification.
Fixed delay line 7 in feedback light path is using space optical path or the optical fiber being made of single mode optical fiber, polarization maintaining optical fibre
Light path, length are acquired according to the calculating of specific pump light repetition rate.Adjustable delay line 8 is using optical time delay unit or delay motor
.
Embodiment one：As shown in figure 3, being switched fast for full fiber type gain spectral band and fine adjustable optical parametric oscillation
Device.
This device includes multiple as the rare-earth-ion-doped fiber laser system, Polarization Controller (PC), wavelength-division of pumping source
With device (WDM), photonic crystal fiber (PCF), output coupler (OC), delay single mode optical fiber and optical time delay unit.
In the present embodiment as the rare-earth-ion-doped fiber laser system output wavelength of pumping source be 1030nm, repeat frequency
Rate is the laser of 2MHz, and Polarization Controller (PC) controls the polarization state of pump light, and pump light enters photon through wavelength division multiplexer WDM
Crystal optical fibre PCF.Four-wave mixing effect occurs in photonic crystal fiber PCF for the pump light that wavelength is 1030nm, generates 780nm
Nearby and 900nm is to flashlight between 1000nm.Output coupler (OC) is by part signal light output, by another part by prolonging
When single mode optical fiber and optical time delay unit feed back to photonic crystal fiber PCF.Be delayed single-mode optical fiber length by pumping source repetition rate
Pass through formula below：
It acquires, c is the light velocity, and v is pump light repetition rate, and n is delay single mode optical fiber refractive index.The present embodiment is calculated
The single-mode optical fiber length that is delayed is 100 meters, is in order to which the flashlight of feedback is allowed to be overlapped with pump light when entering photonic crystal fiber.
Dispersion occurs after 100 meters of delay single mode optical fiber for the flashlight of feedback, flashlight is widened in the time domain to more than pump
Pu light pulsewidth, therefore the wavelength that can be overlapped by adjusting delay control signal light with pump light, the signal overlapped with pump light
Parametric amplifier effect occurs in photonic crystal fiber for optical wavelength, and signal light power is amplified, and output coupler (OC) will be put
Big flashlight part output, part is fed back, is moved in circles with this again.When polarization of pumping beams and photonic crystal fiber PCF are fast
Axis or slow axis occur scalar and modulate unstable (SMI) and generate the flashlight near 783nm and 787nm respectively when overlapping；Work as pump
Cross-phase Modulation unstable (XPMI) occurs when Pu polarization state and photonic crystal fiber PCF main shafts at 45 ° and generates 900nm
The flashlight of~1000nm.Being switched fast for gain spectral band is reached, such as can be directly real by adjusting polarization of pumping beams
The now output wavelength switching from 783nm to 950nm.The degree of regulation of optical time delay unit is 0.001ps, and corresponding centre wavelength is adjusted
Precision is 0.0002nm, realizes output spectrum fine-tuning in gain spectral band.
Embodiment two：As shown in figure 4, being switched fast for spatial mode gain spectral band and fine adjustable optical parametric oscillator.
This device includes 1/2, two dichroscope of rare-earth-ion-doped fiber laser system, half-wave plate as pumping source
DM, lithium columbate crystal (PPLN), delay speculum and delay motor.
In the present embodiment as the rare-earth-ion-doped fiber laser system output wavelength of pumping source be 1064nm, repeat frequency
Rate is the laser of 2MHz, and half-wave plate controls the polarization state of pump light, and pump light enters lithium columbate crystal through dichroscope DM1
(PPLN).Four-wave mixing effect occurs in lithium columbate crystal (PPLN) for the pump light that wavelength is 1064nm, generates near 600nm
And 800nm is to flashlight between 1000nm.Dichroscope DM2 exports part signal light transmission, and another part is reflected signal
Light passes through speculum and the delay motor feedback time lithium columbate crystal (PPLN) of being delayed.Be delayed the delay that speculum individual reflection introduces
It measures as 1m, for feedback signal light in delay speculum internal reflection 100 times, total amount of delay is 100m, this amount of delay and pump light
Repetition rate matches.Scalar modulation occurs when polarization of pumping beams is overlapped with lithium columbate crystal (PPLN) fast axle or slow axis not
Stablize (SMI), generate the flashlight near 600nm and 610nm respectively；When polarization of pumping beams and lithium columbate crystal (PPLN) are main
It is unstable (XPMI) that Cross-phase Modulation occurs when axis is at 45 °, generates the flashlight of 800nm~1000nm.It is pumped by adjusting
Polarization state has reached being switched fast for gain spectral band, such as the output wavelength that can be directly realized by from 600nm to 1000nm is cut
It changes, wavelength variable quantity reaches 400nm.The degree of regulation of delay motor is 0.001ps, and corresponding centre wavelength degree of regulation is
0.0002nm realizes output spectrum fine-tuning in gain spectral band.
Claims (5)
1. a kind of gain spectral band is switched fast and fine adjustable optical parametric oscillator, which is characterized in that including sequentially connected
Pumping source, Polarization Controller, photo-coupler, birefringence mode nonlinear dielectric, output coupler, output terminal and fixed delay line and
Adjustable delay line composition feedback light path, pump light output light through Polarization Controller again the multiplex end through photo-coupler enter it is two-fold
Nonlinear dielectric is penetrated, the polarization state of the pump light of Polarization Controller control input birefringent nonlinear medium, pump light is by double
Output coupler is output to after refraction nonlinear dielectric four-wave mixing, output coupler one end connects output terminal by part light output,
Other end fixed delay line of ining succession feeds back part light, and feedback light adjusts light echo coupler again through adjustable delay line, feedback light with
Pump light enters in birefringent nonlinear medium jointly through photo-coupler.
2. gain spectral band is switched fast and fine adjustable optical parametric oscillator according to claim 1, which is characterized in that institute
State Polarization Controller selection wave plate or optical fiber polarization controller.
3. gain spectral band is switched fast and fine adjustable optical parametric oscillator according to claim 1, which is characterized in that institute
State the wavelength division multiplexer of optical coupling selection optical fiber structure or the dichroscope of space structure.
4. gain spectral band is switched fast and fine adjustable optical parametric oscillator according to claim 1, which is characterized in that institute
It states birefringent nonlinear medium and photonic crystal fiber replacement may be selected, four-wave mixing occurs inside it under the action of pump light
Effect, and light signal fed back is subjected to parameter amplification.
5. gain spectral band is switched fast and fine adjustable optical parametric oscillator according to claim 1, which is characterized in that institute
The fixed delay line in feedback light path is stated using space optical path or the optic fibre light path being made of single mode optical fiber, polarization maintaining optical fibre, it is long
Degree is acquired according to the calculating of specific pump light repetition rate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108963748A (en) * | 2018-06-13 | 2018-12-07 | 上海理工大学 | Multi-functional coherent Raman scattering bio-imaging light source |
| CN109038204A (en) * | 2018-07-05 | 2018-12-18 | 上海理工大学 | Stimulated Raman scattering imaging source based on photonic crystal fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108963748B (en) * | 2018-06-13 | 2020-07-17 | 上海理工大学 | Multifunctional coherent Raman scattering biological imaging light source |
| CN109038204A (en) * | 2018-07-05 | 2018-12-18 | 上海理工大学 | Stimulated Raman scattering imaging source based on photonic crystal fiber |
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