CN207677250U - Based on inner cavity from the tunable blue ray radiation source of frequency multiplication - Google Patents
Based on inner cavity from the tunable blue ray radiation source of frequency multiplication Download PDFInfo
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- CN207677250U CN207677250U CN201721084186.9U CN201721084186U CN207677250U CN 207677250 U CN207677250 U CN 207677250U CN 201721084186 U CN201721084186 U CN 201721084186U CN 207677250 U CN207677250 U CN 207677250U
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Abstract
The utility model is related to belong to non-linear optical field, to realize the blue laser output of wavelength continuously adjustable, there is high conversion efficiency, simple in structure, cheap, the contour technical performance of miniaturization, more with practical value and industrialization value.For this purpose, the technical solution adopted in the utility model is, based on inner cavity from the tunable blue ray radiation source of frequency multiplication, include the following steps：Using Nd:YAG (neodymium-doped garnet) Q-switched laser generates the 1064nm linearly polarized lights of polarization direction vertically, by focus lens group shrink beam, laser polarization state is adjusted through 1064nm half-wave slips and is incident in the frequency multiplication ktp crystal for the II type-Ⅱphase matching condition that meets, the 532nm laser of polarization state vertically is generated through frequency multiplication, OPO systems are reflected into through 45 ° of high reflective mirrors, pump the inner cavities the OPO ktp crystal controlled by electronic galvanometer rotating platform.The utility model is mainly used in tunable blue ray radiation source and manufactures and designs.
Description
Technical field
The utility model is related to belong to non-linear optical field, specifically, it is related to the tunable indigo plant from frequency multiplication based on inner cavity
Optical emitter and implementation method.
Background technology
Blue light refers to the electromagnetic wave that wavelength is between 400-480nm.Blue light relies on its specific physical properties, in many realities
There is huge application potential with field.First, blue light can effectively improve coloured silk as one of three primary colors, high-brightness blue laser
The Color Range and brightness that color is shown have the ability for improving color display effect；Next, blue light has shorter compared with feux rouges
Wavelength, therefore it has the characteristics that small diffraction effect, high resolution, focused spot size are small, these features make it in height
Information capacity can be improved to nearly an order of magnitude in the fields such as density optical storage and digital video technology；Blue laser is sea
The window of ocean transmission, attenuation coefficient is small, strong antijamming capability, is suitable for subsurface communication and perception marine information；In addition, blue
Laser can be used for capturing and damp the thermal vibration of Cs atom, eliminate dopplerbroadening caused by thermal vibration, be the accurate of spectrum line
It measures and guarantee is provided；In addition, blue laser is detected in medicine and also there is important application in the fields such as laser amusement.Blue laser exists
The above field have it is huge answer advantageous, but compared with ripe 532nm green laser technologies, blue laser lacks effective
Acquisition pattern, application cost are higher.
Currently, the main means for obtaining all solid state blue laser include mainly：(1) semiconductors such as GaN (gallium nitride) are utilized
Material is directly realized by the semiconductor laser of blue wave band of laser output, and which has small, the advantages such as efficient, still
Optical quality is poor；(2) blue laser is generated based on single-frequency, the infrared semiconductor laser frequency multiplication of high light beam quality, but it is defeated
It is relatively low to go out power；(3) based on the blue laser that up-conversion is gain media, but the stability for exporting blue light is poor；
(4) it is based on solid state laser frequency multiplication and the nonlinear optical frequency conversions mode such as frequency and frequency tripling generates blue laser, still
The non-linear process being related to is more, and transfer efficiency is relatively low.In addition, also a kind of frequency doubling Blue-light based on periodical poled crystal generates
Theory.Above scheme can obtain the blue laser output of single wavelength.Above-mentioned each process is in current blue laser field
The obtaining means of most effective use.Chinese invention patent 201510923025.3 discloses a kind of based on fan-shaped periodical poled crystal
Tunable blue ray radiation source, which includes the infrared semiconductor laser of a tunable wave length；One collimation focusing system with
And a fan-shaped periodical poled crystal, fan-shaped periodical poled crystal can be for outside Different Red as the frequency-doubling crystal of infrared pump light
The wavelength regulation crystal period is to realize tunable blue laser output.The shortcomings that this system is tunable red light semiconductor laser
Tuning range is smaller, causes blue light tuning range limited, while periodical poled crystal manufacture difficulty is big and damage threshold is low, limitation
The practicability and output power of tunable blu-ray system.The method for currently realizing tunable blue light is less, and technology is not
It is ripe.
Laser self frequency-doubling crystal refers to crystal while being used as laser gain medium, while as nonlinear optics frequency-doubling crystal.
It can be directly realized by double-frequency laser output based on self-frequency-doubling crystal, system structure is compact, but based on laser self frequency-doubling crystal's
Laser tuning limited features and crystalline is less.Compared to laser crystal, the application of nonlinear optics parametric gain crystal is more
To be flexible, and type is more, if make nonlinear optics parametric gain crystal while working as frequency-doubling crystal, you can realize non-thread
Property optics self-frequency-doubling crystal.
Mineral crystal, such as KTP (potassium titanium oxide phosphate) crystal, BBO (barium metaborate) crystal and PPLN (period polarized niobic acids
Lithium) crystal etc., match condition by its larger nonlinear factor, smaller absorption coefficient and phase, is that non-linear frequency becomes
Very common crystal in changing.The typical crystal that wherein ktp crystal is.Ktp crystal is KTiOPO4(potassium titanium oxide phosphate) crystal
Abbreviation, belongs to rhombic system, space group Pna21, point group mm2, with larger nonlinear factor, wider permission temperature with
Allow angle, higher damage threshold, wider transparency range, good physics, chemistry and mechanical performance.Due to KTP crystalline substances
The birefringent characteristic of body, the angular phase matching technique based on ktp crystal is more mature, is suitable for frequency multiplication (SHG) and frequency
(SFG) and the various nonlinear optical frequency conversion modes such as optical parametric oscillator (OPO).In the suitable cutting angle of ktp crystal
Under degree, multiple phase matched processes can be met in ktp crystal simultaneously, multiple non-linear frequency conversion processes are achieved.Such as
Fruit can make one piece of ktp crystal while meeting OPO processes, SHG processes and SFG by designing crystal corner cut and optical maser wavelength
Process had both made ktp crystal become non-linear self-frequency-doubling crystal, can obtain the laser output of tunable multi-wavelength.Actually
The parameter of crystal can be designed according to the wavelength requirement of blue laser, so that one piece of ktp crystal is used as OPO crystal simultaneously
As SHG and SFG crystal, realize that OPO intracavitary obtains multi-wavelength tunable blue laser output from frequency multiplication.
Invention content
In order to overcome the deficiencies of the prior art, the utility model is directed to a kind of blue light spoke obtaining wavelength continuously adjustable
The method and device in source is penetrated, realizes the blue laser output of wavelength continuously adjustable.The blue light acquisition methods have high conversion efficiency, knot
Structure is simple, cheap, the contour technical performance of miniaturization, is allowed to more with practical value and industrialization value.For this purpose, this practicality
It is novel the technical solution adopted is that, based on inner cavity from the tunable blue ray radiation source of frequency multiplication, structure is：Pumping source uses Nd:YAG
Q-switched laser；Pump light frequency-doubling crystal uses ktp crystal, frequency-doubling crystal corner cut to meet II type-Ⅱphase matching condition；OPO systems,
The internal system is provided with ktp crystal, and corner cut is θ=65.2 °,Optical polish is carried out to side and carries out special plated film,
The inner cavity ktp crystal is placed on rotatable galvanometer platform, and rotatable galvanometer platform is connected with computer, using computer control
System changes its outer electromechanical pressure, to realize rotation angle.
Specifically, the laser is neodymium-doped yttrium-aluminum garnet Nd:YAG Q-switched lasers, output wavelength 1064nm,
Pulsewidth is ns magnitudes, and polarization state is the linearly polarized light vertically polarized；Further include receive the laser emitting light by
It focuses convex lens and focuses the focus lens group of concavees lens composition, 1064nm half-wave plates are arranged after focus lens group, are used for
The polarization state of 1064nm laser is adjusted to meet II type-Ⅱphase matching condition in frequency multiplication ktp crystal；The inner cavities OPO are from frequency multiplication KTP
10 × 10 × 2mm of crystalline size3, optical polish is carried out to side and carry out special plated film meet 400~532nm, 700~
900nm and 1300~1500nm wave bands are high thoroughly, can change the phase of crystal by galvanometer rotating platform rotating crystal angle
Matching condition, and then realize wavelength tuning；.
The frequency multiplication ktp crystal, corner cut are θ=90 °,15 × 15 × 10mm of size3For to 1064nm laser
Frequency multiplication generates high-energy 532nm laser, and the 532nm laser of generation is the linearly polarized light vertically polarized, anti-by 45 ° of height
Mirror is reflected into OPO systems, pumps OPO systems；45 ° of high reflective mirrors 6 carry out special plated film and meet 532nm and 1300~1500nm high
Instead, remaining 1064nm fundamental frequency lights absorb 400~500nm and 1064nm high through absorber thoroughly.
OPO systems include to set gradually and be collectively formed from frequency multiplication ktp crystal with the inner cavity ante-chamber of straight chamber light path
Mirror, rotation galvanometer system and Effect of Back-Cavity Mirror, wherein front cavity mirror 7 is as 532nm pump lights input mirror and tunable blue laser output
Mirror, it is 400~532nm that special plated film, which requires, and 1300-1500nm wave bands are high thoroughly, and 700~900nm wave bands are high anti-, Effect of Back-Cavity Mirror 9
As total reflective mirror, plated film requires to be that all band is high anti-.
The characteristics of the utility model and advantageous effect are：
The utility model utilizes the nonlinear optical properties of ktp crystal and the tunable characteristic and inner cavity Gao Gong of OPO
Rate density feature obtains the blue light of tunable wave length, realizes with high conversion efficiency, room temperature operating, tuned speed is fast, output is blue
Polarization of light can obtain the arbitrary blue light of wavelength in a wavelength range, while can obtain multi-wavelength simultaneously by optimization
Tunable blue light.Meanwhile this method also provides feasible scheme to obtain arbitrary wavelength output from frequency multiplication based on the inner cavities OPO.
Description of the drawings：
Fig. 1 be the utility model based on inner cavity from the fast tunable blue ray radiation source device of frequency multiplication.In figure：
1 is laser, and 2 is focus convex lens, and 3 is focus concavees lens, and 4 be 1064nm half-wave plates, and 5 be frequency multiplication ktp crystal,
6 be high reflective mirror, and 7 be front cavity mirror, and 8 be inner cavity from frequency multiplication ktp crystal, and 9 be Effect of Back-Cavity Mirror, and 10 be rotation galvanometer system, and 11 is calculate
Machine, 12 be absorber.
Fig. 2 be in the utility model inner cavity from the Parameter Map of frequency multiplication ktp crystal.
Fig. 3 is that the utility model may be used as multi-wavelength tunable blue ray radiation source device structure schematic diagram.
Specific implementation mode
The purpose of this utility model is to provide a kind of methods and dress in the blue ray radiation source for obtaining wavelength continuously adjustable
Set, ktp crystal in OPO be designed to nonlinear optics self-frequency-doubling crystal, though its simultaneously as parametric gain crystal and
Frequency-doubling crystal realizes the blue laser output of wavelength continuously adjustable.The blue light acquisition methods have high conversion efficiency, it is simple in structure,
Cheap, the contour technical performance of miniaturization, is allowed to more with practical value and industrialization value.
With reference to embodiment and attached drawing to the utility model based on inner cavity from the fast tunable blue ray radiation of frequency multiplication
Source method and device is described in detail.
The utility model based on inner cavity from the fast tunable blue ray radiation source method and device of frequency multiplication, can efficiently obtain
The linear polarization blue laser of tunable wave length is taken, and wavelength tuning speed is fast, the advantage with room temperature condition operating.This practicality is new
Type based on inner cavity from the fast tunable blue ray radiation source device of frequency multiplication, pumping source uses Nd:YAG Q-switched lasers；Pump light
Frequency-doubling crystal uses ktp crystal, frequency-doubling crystal corner cut to meet II type-Ⅱphase matching condition.Parametric oscillator inner cavity self-frequency-doubling crystal
For ktp crystal, crystal corner cut is θ=65.2 °,Optical polish is carried out to side and carries out special plated film, crystal is placed in can
Rotate on galvanometer platform, be connected with computer, adopt computerized control change its it is outer electromechanical press, to realize rotation angle.
As shown in Figure 1, the utility model based on inner cavity from the fast tunable blue ray radiation of frequency multiplication device in a steady stream, specifically
Include the focus lens group of laser 1 and reception 1 emergent light of laser being made of focusing convex lens 2 and focusing concavees lens 3,
The laser 1 is neodymium-doped yttrium-aluminum garnet Nd:YAG Q-switched lasers, output wavelength 1064nm, pulsewidth are ns magnitudes, partially
Polarization state is the linearly polarized light vertically polarized.It is additionally provided with：
The inner cavities OPO are from frequency multiplication ktp crystal 8, as shown in Fig. 2, brilliant as the parametric gain in optical parametric oscillator simultaneously
Body and inner cavity frequency-doubling crystal.Crystal corner cut is θ=65.2 °,10 × 10 × 2mm of size3, optics throwing is carried out to side
Light simultaneously carries out 400~532nm of special plated film satisfaction, 700~900nm and 1300~1500nm wave bands height thoroughly, is revolved by galvanometer
The phase-matching condition of crystal can be changed by turning 10 rotating crystal angle of platform, and then realize wavelength tuning.
1064nm half-wave plates 4 are arranged after focus lens group, for adjusting the polarization state of 1064nm laser to meet again
II type-Ⅱphase matching condition in frequency ktp crystal 5.
Frequency multiplication ktp crystal 5, corner cut are θ=90 °,15 × 15 × 10mm of size3For to 1064nm laser times
Frequency generates high-energy 532nm laser, and the 532nm laser of generation is the linearly polarized light vertically polarized, the green light warp of generation
It crosses 45 ° of high reflective mirrors 6 and is reflected into OPO systems, pump OPO systems.45 ° of high reflective mirrors 6 carry out special plated film and meet 532nm and 1300
~1500nm high is anti-, and remaining 1064nm fundamental frequency lights absorb 400~500nm and 1064nm high through absorber 12 thoroughly.
OPO is from frequency doubling system, with then inner cavity from the blue laser of the tunable linear polarization of 8 output wavelength of frequency multiplication ktp crystal,
Include front cavity mirror 7, the rotation galvanometer system for setting gradually and being collectively formed from frequency multiplication ktp crystal 8 with the inner cavity straight chamber light path
System 10 and Effect of Back-Cavity Mirror 9.Wherein front cavity mirror 7 and Effect of Back-Cavity Mirror 9 need to carry out special plated film respectively, and front cavity mirror 7 is pumped as 532nm
Pu light input mirror and tunable blue laser output mirror, it is 400~532nm that special plated film, which requires, and 1300-1500nm wave bands are high
Thoroughly, 700~900nm wave bands are high anti-, and Effect of Back-Cavity Mirror 9 is used as total reflective mirror, plated film to require to be that all band is high anti-.
Computer 11 connects galvanometer rotating platform, for controlling the electricity on galvanometer rotating platform 10 by data collecting card
Pressure reaches the angle for changing and being rotated from frequency multiplication ktp crystal 8, final real to change the intracavitary oscillator signal optical wavelength from frequency multiplication
The tuning of existing blue light wavelength.
The utility model for based on inner cavity from the method for the fast tunable blue ray radiation source device of frequency multiplication, be by
It is realized from frequency multiplication in single resonance OPO parametric gains crystal, including following procedure：Using Nd:YAG Q-switched lasers generate polarization side
To 1064nm linearly polarized lights vertically, by focus lens group shrink beam, laser polarization is adjusted through 1064nm half-wave slips
State is simultaneously incident in the frequency multiplication ktp crystal for the II type-Ⅱphase matching condition that meets, vertically through frequency multiplication generation polarization state
532nm laser, 532nm laser are reflected into OPO systems through 45 ° of high reflective mirrors, and electronic galvanometer rotating platform is placed in pump cavity
On ktp crystal above, it is polarization state near 1.3 μm along vertical that crystal can generate a branch of wavelength as parametric gain crystal
The tunable letter of polarization state in the horizontal direction near the tunable ideler frequency light in direction and a branch of corresponding 700-900nm
Number light, the front and back hysteroscope plated film of OPO systems is to ensure that signal light is vibrated in intracavitary to improve the power density of intracavitary signal light.Chamber
The high power density signal light of interior oscillation meets I type-Ⅱphase matching needed for frequency multiplication simultaneously in intracavitary parametric gain ktp crystal
Condition, i.e. intracavitary ktp crystal realize the function as parametric gain crystal and frequency-doubling crystal simultaneously, final to obtain by tunable
The tunable blue laser output that signal optical sccond-harmonic generation generates, and blue light polarization state is linearly polarized light vertically.In combination with KTP
The angular phase of crystal matches, and controls the voltage on galvanometer rotary system 10 by computer, changes the angle of intracavitary ktp crystal
Degree, to realize the blue laser output of wavelength fast tunable.
The utility model based on inner cavity from the specific embodiment body of the fast tunable blue ray radiation source device of frequency multiplication
Now it is as shown in Figure 1 based on inner cavity from the fast tunable blue ray radiation source device of frequency multiplication.Using dress as shown in Figure 1
It sets, special designing is carried out to the cutting angle of intracavitary parametric gain crystal, and can meet to the special plated film of OPO hysteroscopes progress interior
The blue laser output of fast tunable may be implemented in combination with galvanometer rotary system from frequency multiplication condition in chamber.
The utility model another using in embodiment, please refer to shown in Fig. 3, place one piece of ginseng again in resonant cavity
Flow gain ktp crystal, all parameters are identical as from frequency multiplication ktp crystal 8, and two pieces of crystal are controlled respectively by galvanometer rotary system 10
Rotation angle, then can obtain the blue laser of three tunable wave lengths simultaneously, wavelength components are from intracavitary oscillation
Between the respective frequency multiplication process of two wavelength signals light and two wavelength and frequency process.
The utility model utilizes nonlinear optical frequency conversion principle, and specially angle-cut ktp crystal is placed in resonant cavity,
Make it while meeting I type-Ⅱphase matching condition of II type-Ⅱphase matching condition of OPO processes and frequency multiplication process, and then to OPO intracavitary
The signal light of the high power density of oscillation carries out frequency multiplication process, the final blue laser for obtaining fast tunable.It is applied by changing
The voltage being added on high-precision galvanometer can realize ktp crystal high-precision rotary to realize the wavelength continuously adjustable characteristic of blue light.
Utility model device have it is compact-sized flexibly, tunable, the advantages that optical quality is good, can be used for overocean communications and ocean
The fields such as information detection.
Utility model device structure is as shown in Figure 1, the high-energy 532nm green lights when linear polarization are anti-by 45 ° of high reflective mirrors 6
After penetrating, by the front cavity mirror 7 of special plated film respectively, the resonant cavity constituted from frequency multiplication ktp crystal 8 and Effect of Back-Cavity Mirror 9, wherein from
Frequency multiplication ktp crystal 8 is placed on high-precision galvanometer rotating platform 10, meets optical parametric oscillator II from 8 corner cut of frequency multiplication ktp crystal
Type-Ⅱphase matching condition,
I.e.
ν532nm=νsignal+νidler
A branch of linear polarization is generated under the pumping of 532nm green lights and polarization state 800nm identical with 532nm green lights or so intracavitary
The ideler frequency light of the orthogonal 1300nm of the signal light and polarization state of oscillation or so, at the same the signal light of intracavitary oscillation from
Also meet I type-Ⅱphase matching condition of frequency multiplication in frequency multiplication ktp crystal 8.
I.e.
2×νsignal=νblue
A branch of polarization state blue laser orthogonal with signal light is generated, this beam blue laser is generated with previous non-linear process
Ideler frequency light is collinearly transmitted, and is filtered by 45 ° of high reflective mirrors, you can obtains blue laser output.Herein on basis, pass through computer
11 change the voltage V being applied in 10 system of galvanometer rotating platform, can the accurate phase matched controlled from frequency multiplication ktp crystal 8
Angle, and then can obtain the signal light of the intracavitary oscillation of tuning, the signal light of different wave length can be from frequency multiplication ktp crystals
Frequency multiplication process occurs in 8, and then the blue laser output of wavelength continuously adjustable can be obtained.From frequency multiplication ktp crystal 8 in light beam
Thickness L on the direction of propagation also needs to optimize (L=1~2mm in the utility model).
The utility model another using embodiment be utilized intracavitary high power density realize intracavitary multi-non-linear
Process, while obtaining multi-wavelength fast tunable blue laser output.
Finally it should be noted that：The preferred embodiment that these are only the utility model, is not intended to limit the utility model,
Although the utility model is described in detail with reference to embodiment, for those skilled in the art, still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features,
But within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done, should be included in
Within the scope of protection of the utility model.
Claims (4)
1. it is a kind of based on inner cavity from the tunable blue ray radiation source of frequency multiplication, characterized in that structure is：Pumping source uses Nd:YAG tune
Q lasers；Pump light frequency-doubling crystal uses ktp crystal, frequency-doubling crystal corner cut to meet II type-Ⅱphase matching condition；OPO systems, should
Internal system is provided with ktp crystal, and corner cut is θ=65.2 °,Optical polish is carried out to side and carries out plated film, it is described interior
Chamber ktp crystal is placed on rotatable galvanometer platform, and rotatable galvanometer platform is connected with computer, adopts change of computerizeing control
Its outer electromechanical pressure, to realize rotation angle.
2. as described in claim 1 based on inner cavity from the tunable blue ray radiation source of frequency multiplication, characterized in that specifically, described
Laser be neodymium-doped yttrium-aluminum garnet Nd:YAG Q-switched lasers, output wavelength 1064nm, pulsewidth are ns magnitudes, polarization state
For the linearly polarized light vertically polarized；Further include the recessed by focusing convex lens and focusing of the reception laser emitting light
Microscope group at focus lens group, 1064nm half-wave plates, be arranged after focus lens group, the polarization for adjusting 1064nm laser
State is to meet II type-Ⅱphase matching condition in frequency multiplication ktp crystal；The inner cavities OPO are from 10 × 10 × 2mm of frequency multiplication ktp crystal size3,
Optical polish is carried out to side and carries out 400~532nm of plated film satisfaction, 700~900nm and 1300~1500nm wave band height
Thoroughly, the phase-matching condition of crystal can be changed by galvanometer rotating platform rotating crystal angle, and then realize wavelength tuning.
3. as described in claim 1 based on inner cavity from the tunable blue ray radiation source of frequency multiplication, characterized in that the frequency multiplication KTP
Crystal, corner cut are θ=90 °,15 × 15 × 10mm of size3For generating high-energy 532nm to 1064nm laser freuqency doublings
The 532nm laser of laser, generation is the linearly polarized light vertically polarized, and OPO systems are reflected by 45 ° of high reflective mirrors,
Pump OPO systems；45 ° of high reflective mirrors (6) carry out plated films and meet 532nm and 1300~1500nm high instead, 400~500nm and
Remaining 1064nm fundamental frequency lights absorb 1064nm high through absorber thoroughly.
4. as described in claim 1 based on inner cavity from the tunable blue ray radiation source of frequency multiplication, characterized in that OPO systems include
Have set gradually and with the inner cavity from frequency multiplication ktp crystal be collectively formed straight chamber light path front cavity mirror, rotation galvanometer system and
Effect of Back-Cavity Mirror, wherein as 532nm pump lights input mirror and tunable blue laser output mirror, plated film requires to be 400 front cavity mirror (7)
~532nm and 1300-1500nm wave bands are high thoroughly, and 700~900nm wave bands are high anti-, and Effect of Back-Cavity Mirror (9) is used as total reflective mirror, plated film to want
It asks as all band height instead.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425407A (en) * | 2017-08-28 | 2017-12-01 | 天津大学 | Based on inner chamber from the tunable blue ray radiation source of frequency multiplication and implementation method |
| CN112640231A (en) * | 2018-09-20 | 2021-04-09 | 烟台龙驰光电技术有限公司 | Near-infrared laser and laser generation method |
| CN114371149A (en) * | 2022-01-20 | 2022-04-19 | 池州市农产品质量安全监测中心 | Agricultural product quality safety detection system |
-
2017
- 2017-08-28 CN CN201721084186.9U patent/CN207677250U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425407A (en) * | 2017-08-28 | 2017-12-01 | 天津大学 | Based on inner chamber from the tunable blue ray radiation source of frequency multiplication and implementation method |
| CN107425407B (en) * | 2017-08-28 | 2023-09-15 | 天津大学 | Tunable blue light radiation source based on inner cavity self-frequency multiplication and implementation method |
| CN112640231A (en) * | 2018-09-20 | 2021-04-09 | 烟台龙驰光电技术有限公司 | Near-infrared laser and laser generation method |
| CN114371149A (en) * | 2022-01-20 | 2022-04-19 | 池州市农产品质量安全监测中心 | Agricultural product quality safety detection system |
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