CN108512033A - laser and harmonic method - Google Patents
laser and harmonic method Download PDFInfo
- Publication number
- CN108512033A CN108512033A CN201810299577.5A CN201810299577A CN108512033A CN 108512033 A CN108512033 A CN 108512033A CN 201810299577 A CN201810299577 A CN 201810299577A CN 108512033 A CN108512033 A CN 108512033A
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- laser
- superlattices
- tunable
- wavelength
- optical fiber
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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
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/041—Optical pumping
-
- 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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
-
- 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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/0604—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium comprising a non-linear region, e.g. generating harmonics of the laser frequency
- H01S5/0605—Self doubling, e.g. lasing and frequency doubling by the same active medium
-
- 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
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
- H01S5/125—Distributed Bragg reflector [DBR] lasers
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of laser and harmonic methods.This method generates high power near-infrared laser by the DBR laser of tunable wave length as seed light injection fibre laser, tunable green pump laser is generated through waveguide type chirp superlattices frequency multiplication, then by the tunable red laser of waveguide type optical parametric oscillator generation wavelength.DBR seed optical wavelength is tuned i.e. between 500nm 530nm, generates 600nm 700nm tunable wave length red lasers.The present invention does not include mechanical moving element, and wavelength tuning is by automatically controlled modulation, and small, reliability is high, and tuned speed is fast.
Description
Technical field
The present invention relates to laser technology and non-linear optical field more particularly to a kind of laser and harmonic methods.
Background technology
Currently, the industrial circles such as the field of scientific studies such as biology, material and medical treatment, detection to visible laser especially
Red laser has widespread demand.Currently used red laser is mostly semiconductor and solid state laser, due to by sharp
The limitation of light emitting mechanism and laser material performance, output wavelength are mostly the fixed bands such as 630nm, 650nm, 671nm, wavelength
It can not arbitrarily tune, strongly limit its application in above-mentioned field.Such as in photodynamic therapy treatment neoplastic process, need
It assists generating singlet oxygen with photosensitizer to kill cancer cell, different photosensitizers are widely different to the absorption peak of laser, need
The different wave length laser therapeutic apparantus that even wavelength can be tuned arbitrarily just has good therapeutic effect.The way of generation wavelength tunable laser
One of diameter is using frequency transform techniques, such as frequency multiplication, difference frequency and optical parametric oscillation etc..At present with all solid state laser pumping
Optical parametric oscillator is mechanically adjusted using crystal such as BBO, LBO, KTP or PPLN as nonlinear frequency converters part
The conditions such as angle, the position of whole crystal, can be according to demand with red laser of the generation wavelength from 600nm to 700nm, wavelength
It realizes arbitrary output, disclosure satisfy that demand of the demand to wavelength and power.But since nonlinear crystal must pass through machine
The mode of tool regulation and control adjusts wavelength, causes containing components such as stepper motor, rotation or displacement platforms inside device, complicated,
Volume is big, and tuned speed is slow, and stability and reliability are insufficient.
Distribution bragg semiconductor laser (DBR) is a kind of defeated to reach adjustment by regulating and controlling voltage distributed feed-back element
The laser for going out wavelength, due to not containing mechanical part, thus it is compact-sized, reliability is high, and tuned speed can reach every number of seconds
KHz, tuning range is up to 70nm or more, output power 10mW or so.Ytterbium (ytterbium) optical fiber laser is mixed near 1064nm to have
The gain ranging of 100nm is had more than, output power may be up to tens of watts, pass through (tune Q) exportable Gao Chong after addition modulation element
The ps pulsed laser and ns pulsed laser of complex frequency, high-peak power.Optical parametric oscillation (OPO) laser of a frequency can be converted to signal and
The relevant output of idle frequence, and tuning can be realized in a very wide frequency range, it is that tunable laser generates
One of important means.The appearance of quasi-phase matched nonlinear material (or optical superlattice), greatly improves non-linear frequency
The ability of rate conversion, compared with traditional birefringent phase matching nonlinear material, since it is with high nonlinear coefficient and nothing
The advantages of walking off can make the efficiency of nonlinear frequency conversion obtain significant increase, such as can pass through frequency multiplication in conjunction with guide technology
Technology (SHG) obtains high power 532nm green lasers.
Invention content
The present invention provides a kind of laser and harmonic methods, overcome the mechanical structure of traditional Wavelength tunable laser
Complexity, volume is big, and tuned speed is slow, the problem of stability and reliability deficiency.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of laser, it is characterised in that：By setting gradually DBR laser, Yb dosed optical fiber laser on the same axis
Device, waveguide frequency multiplier and optical parametric oscillator composition, wherein be equipped between the DBR laser and ytterbium-doping optical fiber laser every
From device, pass through optical fiber between the DBR laser, isolator, ytterbium-doping optical fiber laser, waveguide frequency multiplier and optical parametric oscillator
Conduit connects.
The waveguide frequency multiplier is the chirped periodic superlattices of waveguiding structure, and the chirped periodic superlattices are by rectangular base
With the superlattices composition being arranged above rectangular base, the rectangular base is by low-refraction SO2Niobic acid lithium material is bonded to constitute.
The optical parametric oscillator is waveguiding structure superlattices, and the both ends of waveguiding structure superlattices are coated with anti-reflection film, described
Waveguiding structure superlattices plate high-reflecting film in pumping light incident side, and the waveguiding structure superlattices are anti-in the plating 60% of pumping light exit side
Penetrate film.
The chirped periodic superlattices and waveguiding structure superlattices are by LiNbO3、LiTaO3Or KTP materials are constituted.
A kind of wavelength tuning method, which is characterized in that this approach includes the following steps：
A, using the tunable seed light of DBR laser generation wavelength, by the seed light by fiber coupling, and through every
After feedback light is isolated from device, it is injected into ytterbium-doping optical fiber laser；
B, the ytterbium-doping optical fiber laser to injection light source carries out that Q is adjusted to generate pulse laser, and the pulse laser is defeated
Go out to waveguide frequency multiplier；
C, output laser, which enters in waveguide type chirped periodic superlattices, carries out frequency multiplication, generates the 500nm- of mean power 20W
530nm tunable wave length green lights, and optical parametric oscillator is entered by Lens Coupling；
D, the waveguiding structure superlattices in optical parametric oscillator carry out frequency conversion, and output 600nm-700nm red is adjustable
Humorous laser.
The seed light is 1000nm-1060nm tunable wave length small-power infrared lasers.
The repetition rate of the pulse laser is 50KHz, pulse length 100ns, output power 50W, polarization direction
In vertical linear polarization.
The step d is specifically included：The optical parametric oscillator judges to generate red according to the seed optical wavelength after tuning
The wavelength of tunable laser.
Compared with prior art, the present invention has at least the following advantages：
By the technical solution of aforementioned present invention, wavelength tuning, ytterbium-doping optical fiber laser conduct are carried out using DBR laser
Pump light, for the chirped periodic superlattices of waveguiding structure as frequency doubling device, the output of waveguiding structure superlattices optical parametric oscillator can
Tune feux rouges.The laser has the advantages that compact structure, performance are stable, wavelength tuning is fireballing.This method is by Wavelength tunable
Humorous DBR laser generates high power near-infrared laser as seed light injection fibre laser, through waveguide type chirp superlattices
Frequency multiplication generates tunable green pump laser, then by the tunable red laser of waveguide type optical parametric oscillator generation wavelength.Exist
DBR seed optical wavelength is tuned between 500nm-530nm, generates 600nm-700nm tunable wave length red lasers.The present invention does not wrap
Containing mechanical moving element, wavelength tuning is by automatically controlled modulation, and small, reliability is high, and tuned speed is fast, overcomes traditional wavelength
The shortcomings that tunable laser.
Description of the drawings
Fig. 1 is the composed structure schematic diagram of tunable wave length red laser provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of waveguiding structure chirped periodic superlattices provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of waveguiding structure superlattices in optical parametric oscillator provided in an embodiment of the present invention；
Fig. 4 is the flow diagram of wavelength tuning method provided in an embodiment of the present invention.
Specific implementation mode
Below in conjunction with the attached drawing in the present invention, the technical solution in the present invention is clearly and completely described, is shown
So, described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
As shown in Figure 1, a kind of laser proposed for the embodiment of the present invention, it is characterised in that：It is same by being successively set on
DBR laser 1, ytterbium-doping optical fiber laser 3, waveguide frequency multiplier 4 and optical parametric oscillator 5 on axis form, wherein DBR laser
Isolator 2, DBR laser 1, isolator 2, ytterbium-doping optical fiber laser 3, waveguide are installed between device 1 and ytterbium-doping optical fiber laser 3
It is connected by fibre-optic catheter between frequency multiplier 4 and optical parametric oscillator 5.
As shown in Fig. 2, the practical chirped periodic superlattices 6 for waveguiding structure of waveguide frequency multiplier 4, chirped periodic superlattices 6
It is made of rectangular base 61 and the superlattices 62 being arranged above rectangular base, rectangular base 61 uses low-refraction SO2 materials
As substrate, after being bonded niobic acid lithium material, chirped periodic superlattices are made by room temperature electrical-poling technique, then throw by chemistry
Light mode produces the rectangular waveguide of sectional dimension 100um*100um.In order to improve transfer efficiency, waveguide length 40mm-
50mm。
As shown in figure 3, it is waveguiding structure superlattices 7 that optical parametric oscillator 5 is practical, the both ends of waveguiding structure superlattices 7 are plated
There are anti-reflection film, waveguiding structure superlattices 7 to plate high-reflecting film in pumping light incident side, waveguiding structure superlattices 7 are in pumping light exit side
Plate 60% reflectance coating.Such structure does not include adjustable hysteroscope, and oscillation light is constrained in waveguide internal reflection, efficient, good reliability.
Preferably, chirped periodic superlattices 6 and waveguiding structure superlattices 7 are by LiNbO3、LiTaO3Or KTP materials are constituted, tool
There are waveguide type section and the waveguide length of centimetres of hundred micron dimensions, and the polarization cycle of chirped periodic superlattices 6 exists
Between 5um-7um, waveguiding structure superlattices 7 use the 8.8um non-uniform polar periods.
As shown in figure 4, a kind of wavelength tuning method proposed for the embodiment of the present invention, which is characterized in that this method includes
Following steps：
A, using the tunable seed light of DBR laser generation wavelength, by seed light by fiber coupling, and through isolator
After feedback light is isolated, it is injected into ytterbium-doping optical fiber laser；
B, ytterbium-doping optical fiber laser to injection light source carries out that Q is adjusted to generate pulse laser, and pulse laser is exported to waveguide
Frequency multiplier；
C, output laser, which enters in waveguide type chirped periodic superlattices, carries out frequency multiplication, generates the 500nm- of mean power 20W
530nm tunable wave length green lights, and optical parametric oscillator is entered by Lens Coupling；
D, the waveguiding structure superlattices in optical parametric oscillator carry out frequency conversion, and output 600nm-700nm red is adjustable
Humorous laser.
Further, the design parameter of DBR laser is：Output power 10mW, tuning wavelength 1000nm-1060nm are adjusted
Humorous speed 10KHz.Ytterbium-doping optical fiber laser is constituted using polarization-preserving optical fibre device, and 50KHz repetition rates are exported using Q modes are adjusted
Pulse laser, pulse length about 100ns, polarization direction are in vertical linear polarization, and output power is about 50W, and output wavelength is by noting
Enter the decision of seed optical wavelength.
Preferably, seed light is 1000nm-1060nm tunable wave length small-power infrared lasers.The repetition frequency of pulse laser
Rate is 50KHz, pulse length 100ns, output power 50W, and polarization direction is in vertical linear polarization.
To the frequency multiplication process in step c, details are as follows below：
Frequency multiplication process of the present invention is really a kind of three couple waves non-linear process, you can is considered as a kind of special and frequency mistake
The period of journey, chirped periodic superlattices is determined with wavelength by following formula：
Wherein Λ is superlattice period, and λ 1, λ 2 and λ 3 are the wavelength of frequency doubled light, fundamental wave 1 and fundamental wave 2, n1, n2 respectively
It is the corresponding refractive index of corresponding optical maser wavelength with n3, T is temperature.When fundamental wave 1 is equal with the wavelength of fundamental wave 2, as again
Frequency process.From the above equation, we can see that when for fundamental wave Wavelength variable (1000nm-1060nm), need multiple periods (Λ) real
Existing frequency multiplication process.Common practice is to use multichannel superlattices, in transversely arranged a variety of periods, by moving period position come
Match different fundamental wave optical wavelength.The present invention realizes this process using chirped periodic superlattices as shown in Figure 2.Yb dosed optical fiber
The near-infrared laser of laser output is coupled by lens focus to 60um-70um sizes in waveguide.Waveguiding structure can be effective
Hot spot is constrained in the waveguide sections of 100um*100um, make laser power density keep higher level, while with single mode wave
It leads and can ensure simultaneous while transfer efficiency to avoid damage is not generated under higher power level compared to larger waveguide sections
Has higher power.
When output pulse laser, which enters waveguide type chirped periodic superlattice crystal, carries out frequency multiplication, chirped periodic is ranging from
5.72um-6.90um waveguide long 40mm-50mm, sectional dimension 100um*100um.It is 20W's that frequency multiplication, which generates mean power,
500nm-530nm tunable wave length green lights enter waveguide type optical parametric oscillator by Lens Coupling.When pump power is more than oscillation
After device threshold value, oscillator exports 600nm-700nm red tunable lasers, and optical maser wavelength is determined by pump wavelength.Optical parameter
Oscillator judges the wavelength for generating red tunable laser according to the seed optical wavelength after tuning.
Compared with prior art, the present invention has at least the following advantages：
By the technical solution of aforementioned present invention, wavelength tuning, ytterbium-doping optical fiber laser conduct are carried out using DBR laser
Pump light, for the chirped periodic superlattices of waveguiding structure as frequency doubling device, the output of waveguiding structure superlattices optical parametric oscillator can
Tune feux rouges.The laser has the advantages that compact structure, performance are stable, wavelength tuning is fireballing.This method is by Wavelength tunable
Humorous DBR laser generates high power near-infrared laser as seed light injection fibre laser, through waveguide type chirp superlattices
Frequency multiplication generates tunable green pump laser, then by the tunable red laser of waveguide type optical parametric oscillator generation wavelength.Exist
DBR seed optical wavelength is tuned between 500nm-530nm, generates 600nm-700nm tunable wave length red lasers.The present invention does not wrap
Containing mechanical moving element, wavelength tuning is by automatically controlled modulation, and small, reliability is high, and tuned speed is fast, overcomes traditional wavelength
The shortcomings that tunable laser.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (5)
1. a kind of laser, it is characterised in that：By set gradually DBR laser on the same axis, ytterbium-doping optical fiber laser,
Waveguide frequency multiplier and optical parametric oscillator composition, are isolated wherein being equipped between the DBR laser and ytterbium-doping optical fiber laser
Device is led between the DBR laser, isolator, ytterbium-doping optical fiber laser, waveguide frequency multiplier and optical parametric oscillator by optical fiber
Pipe connects.
2. laser as described in claim 1, it is characterised in that：The waveguide frequency multiplier is that the chirped periodic of waveguiding structure is super
Lattice, the chirped periodic superlattices are made of rectangular base and the superlattices being arranged above rectangular base, the rectangular base
Seat is by low-refraction SO2Niobic acid lithium material is bonded to constitute.
3. laser as described in claim 1, it is characterised in that：The optical parametric oscillator is waveguiding structure superlattices, wave
The both ends of guide structure superlattices are coated with anti-reflection film, and the waveguiding structure superlattices plate high-reflecting film, the wave in pumping light incident side
Guide structure superlattices plate 60% reflectance coating in pumping light exit side.
4. the laser as described in claim 2 and 3, it is characterised in that：The chirped periodic superlattices and waveguiding structure are super brilliant
Lattice are by LiNbO3、LiTaO3Or KTP materials are constituted.
5. a kind of wavelength tuning method, which is characterized in that this approach includes the following steps：
A, using the tunable seed light of DBR laser generation wavelength, by the seed light by fiber coupling, and through isolator
It after feedback light is isolated, is injected into ytterbium-doping optical fiber laser, the seed light is 1000nm-1060nm tunable wave length small-powers
Infrared laser；
B, the ytterbium-doping optical fiber laser to injection light source carry out adjust Q generate pulse laser, and by the pulse laser export to
The repetition rate of waveguide frequency multiplier, the pulse laser is 50KHz, pulse length 100ns, output power 50W, polarization side
To in vertical linear polarization；
C, output laser, which enters in waveguide type chirped periodic superlattices, carries out frequency multiplication, generates the 500nm-530nm of mean power 20W
Tunable wave length green light, and optical parametric oscillator is entered by Lens Coupling；
D, the waveguiding structure superlattices in optical parametric oscillator carry out frequency conversion, and output 600nm-700nm is red tunable sharp
Light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810299577.5A CN108512033A (en) | 2018-04-04 | 2018-04-04 | laser and harmonic method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810299577.5A CN108512033A (en) | 2018-04-04 | 2018-04-04 | laser and harmonic method |
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| Publication Number | Publication Date |
|---|---|
| CN108512033A true CN108512033A (en) | 2018-09-07 |
Family
ID=63380747
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810299577.5A Withdrawn CN108512033A (en) | 2018-04-04 | 2018-04-04 | laser and harmonic method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473863A (en) * | 2019-01-10 | 2019-03-15 | 合肥全色光显科技有限公司 | A kind of multiple bases laser display apparatus based on wavelength-tuned laser |
-
2018
- 2018-04-04 CN CN201810299577.5A patent/CN108512033A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473863A (en) * | 2019-01-10 | 2019-03-15 | 合肥全色光显科技有限公司 | A kind of multiple bases laser display apparatus based on wavelength-tuned laser |
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