CN114002858B - Homogenizing system and method of pulse laser light source - Google Patents
Homogenizing system and method of pulse laser light source Download PDFInfo
- Publication number
- CN114002858B CN114002858B CN202111638349.4A CN202111638349A CN114002858B CN 114002858 B CN114002858 B CN 114002858B CN 202111638349 A CN202111638349 A CN 202111638349A CN 114002858 B CN114002858 B CN 114002858B
- Authority
- CN
- China
- Prior art keywords
- light source
- laser light
- homogenizing
- dye
- rhodamine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention belongs to the technical field of pulse laser imaging, and particularly relates to a homogenizing system and a homogenizing method of a pulse laser light source. The technical scheme is as follows: a homogenizing system of a pulse laser light source comprises a laser light source, a dye pool and a light condensing system which are sequentially arranged, wherein a rhodamine B liquid phosphor is added into the dye pool, and two cemented lenses are installed in the light condensing system. A homogenizing method of a pulse laser light source comprises the following steps: s1: irradiating the dye cell containing the rhodamine B liquid fluorescent substance by laser to excite to generate fluorescence; s2: the fluorescence is focused and shaped through a cemented lens of the light-gathering system, and the aperture diaphragm is output. The invention provides a homogenizing system and a homogenizing method of a pulse laser light source.
Description
Technical Field
The invention belongs to the technical field of pulse laser imaging, and particularly relates to a homogenizing system and a homogenizing method of a pulse laser light source.
Background
The flow display is an important fluid mechanics experimental technology for researching complex flow and revealing boundary layer separation and a vortex structure thereof, and the optical display is an important means of the flow display. At present, the main development direction in the optical display field is to develop to high temporal resolution and high spatial resolution, with the development of laser technology, the addition of high-energy narrow pulse width and time sequence control brings many new changes for fluid display, and the pulsed laser light source becomes more and more important with the advantages of high-energy narrow pulse width. The principle is that the transient image of the flow field is captured in a slicing mode through a pulse light source, and the time and space integration effect of the traditional display technology is eliminated.
However, the pulse laser is directly used as the illumination light source for transient synchronous imaging, and due to the characteristics of the laser, a large amount of light and dark interference fringes at intervals are generated on the object to be illuminated, which generates serious background noise and affects the imaging quality, so that the laser needs to be homogenized.
Although the ground glass and homogenizing sheet homogenization technology can eliminate part of light and shade alternate stripes, serious laser speckles can be generated at the same time, so that the problem of uneven light and shade still exists in the background;
the principle of the micro lens array homogenization technology is that through the focusing of each subunit on the micro lens array, laser beams are focused again and arranged in an array, and the beam nonuniformity is mutually counteracted based on the array symmetry to achieve the homogenization purpose. However, due to the periodicity of the fourier lens, a periodic array of spots is still present, affecting the homogenization effect of the final microlens array.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a system and a method for homogenizing a pulsed laser source.
The technical scheme adopted by the invention is as follows:
a homogenizing system of a pulse laser light source comprises a laser light source, a dye pool and a light condensing system which are sequentially arranged, wherein a rhodamine B liquid phosphor is added into the dye pool, and two cemented lenses are installed in the light condensing system.
And (3) irradiating the rhodamine B liquid fluorescent substance in the dye pool by laser to excite the dye to generate fluorescence, and outputting the fluorescence to the small-hole diaphragm through focusing and shaping of two cemented lenses of the light condensing system. The aperture diaphragm has uniform light spots, has no interference fringes and noise of laser, and meets the homogenization requirement of a background light source.
According to the preferable scheme of the invention, two side faces of the dye cell through which laser passes are quartz windows, and the rest four faces of the dye cell are provided with frosted materials. The two side surfaces of the dye cell are quartz window light-transmitting surfaces, so that laser can penetrate through the dye cell to excite the dye to generate fluorescence. The other four sides of the dye cell are made of frosted materials, so that the dye cell is convenient to hold by hand.
As a preferable scheme of the invention, the surface of the quartz window facing to the outer side of the dye cell is plated with a visible light broadband antireflection film. And a visible light broadband antireflection film is plated on the outer side of the quartz window, so that the auxiliary laser can better excite the dye.
As a preferable scheme of the invention, the dye cell is sealed by using a sealant. The dye cell is sealed with a sealant to prevent evaporation of the dye.
In a preferred embodiment of the present invention, the wavelength of the laser light source is 532 nm. A532 nm pulse laser is a laser which is mature at present, a flash lamp or an LD pump Nd: YAG laser material is adopted to generate 1.06um laser, and the frequency multiplication is 532nm under the condition of passing through a KTP crystal. Proved by experimental research, the 532nm laser excites the rhodamine B liquid fluorescent substance and has higher conversion efficiency.
In a preferred embodiment of the invention, the concentration of the rhodamine B liquid phosphor is 0.4mg/L to 0.6 mg/L. The fluorescence intensity of the rhodamine B liquid fluorescent substance is larger when the concentration is 0.4 mg/L-0.6 mg/L.
A homogenizing method of a pulse laser light source comprises the following steps:
s1: irradiating the dye cell containing the rhodamine B liquid fluorescent substance by laser to excite to generate fluorescence;
s2: the fluorescence is focused and shaped through a cemented lens of the light-gathering system, and the aperture diaphragm is output.
The laser irradiates the fluorescent dye in the dye cell to excite the dye to generate fluorescence, and the fluorescence is focused and shaped by two cemented lenses of the condensing system to output the aperture diaphragm. The light spots are uniform, interference fringes and noise points of laser are avoided, and the homogenization requirement of a background light source is met.
According to the preferable scheme of the invention, two side faces of the dye cell through which laser passes are quartz windows, and the rest four faces of the dye cell are provided with frosted materials.
In a preferred embodiment of the invention, the concentration of the rhodamine B liquid phosphor is 0.4mg/L to 0.6 mg/L. The fluorescence intensity of the rhodamine B liquid fluorescent substance is larger when the concentration is 0.4 mg/L-0.6 mg/L.
The invention has the beneficial effects that:
the rhodamine B liquid fluorescent substance in the dye pool is irradiated by laser, so that the dye is excited to generate fluorescence. And the fluorescence is focused and shaped by two cemented lenses of the light-gathering system, and is output to the aperture diaphragm. The aperture diaphragm has uniform light spots, has no interference fringes and noise of laser, and meets the homogenization requirement of a background light source.
Drawings
FIG. 1 is a schematic diagram of the homogenization system of the present invention;
FIG. 2 is a graph showing the change in fluorescence intensity of a rhodamine B liquid phosphor.
In the figure, 1-dye cell; 2-a light-gathering system; 3-aperture diaphragm.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, the homogenization system of the pulse laser light source of the present embodiment includes a laser light source, a dye cell 1 and a condensing system 2, which are sequentially disposed, wherein a rhodamine B liquid phosphor is added in the dye cell 1, and two cemented lenses are installed in the condensing system 2.
The laser irradiates the rhodamine B liquid fluorescent substance in the dye cell 1 to excite the dye to generate fluorescence, and the fluorescence is focused and shaped by the two cemented lenses of the condensing system 2 to output the small-hole diaphragm 3. The light spots of the small-hole diaphragm 3 are uniform, interference fringes and noise points of laser are avoided, and the homogenization requirement of a background light source is met.
Two side faces of the dye cell 1, through which laser passes, are quartz windows, and the rest four faces of the dye cell 1 are provided with frosted materials. Two side surfaces of the dye cell 1 are quartz window light-transmitting surfaces, so that laser can penetrate through the dye cell 1 to excite the dye to generate fluorescence. The other four sides of the dye cell 1 are made of frosted materials, so that the dye cell is convenient to hold by hand.
The surface of the quartz window facing the outer side of the dye cell 1 is plated with a visible light broadband antireflection film. And a visible light broadband antireflection film is plated on the outer side of the quartz window, so that the auxiliary laser can better excite the dye.
The dye cell 1 is sealed by a sealant. The dye cell 1 is sealed with a sealant to prevent the dye from evaporating.
Laser selection:
a532 nm pulse laser is a laser which is mature at present, a flash lamp or an LD pump Nd-YAG laser material is adopted to generate 1.06um laser, the frequency multiplication is 532nm under the condition of KTP crystal, and experimental research proves that the conversion efficiency of exciting rhodamine B by the 532nm laser is higher. Parameters of the 532nm pulse laser are as follows:
wavelength: 532 nm;
pulse: less than or equal to 10 ns;
single pulse energy: not less than 40 mJ;
the pumping mode is as follows: semiconductor pumping;
a cooling mode: TEC air cooling;
the working frequency is as follows: 1-20Hz adjustable;
the working mode is as follows: inner trigger (outer trigger).
Furthermore, the concentration of the rhodamine B liquid fluorescent substance is 0.4 mg/L-0.6 mg/L. The fluorescence intensity of the rhodamine B liquid fluorescent substance is larger when the concentration is 0.4 mg/L-0.6 mg/L. As shown in fig. 2, the concentration (ug/ml) x of rhodamine B and the emission spectrum wavelength (nm) y satisfy the relationship: y =1026.6x +5.7677, correlation coefficient R of the linear curve2= 0.9998. The concentration of the rhodamine B liquid fluorescent substance is 0.6 mg/L. The fluorescence intensity of the rhodamine B liquid fluorescent substance is maximum when the concentration is 0.6 mg/L.
A532 nm pulse laser is adopted to irradiate the rhodamine B dye to generate visible light with the central wavelength of 625nm, and the visible light is used as a transient illumination light source, so that an ideal homogenization effect is achieved.
A homogenizing method of a pulse laser light source comprises the following steps:
s1: irradiating the dye cell 1 filled with the rhodamine B liquid fluorescent substance by laser to excite to generate fluorescence;
s2: the fluorescence is focused and shaped by a cemented lens of the light-gathering system 2, and is output to the aperture diaphragm 3.
The laser irradiates the fluorescent dye in the dye cell 1 to excite the dye to generate fluorescence, and the fluorescence is focused and shaped by two cemented lenses of the condensing system 2 to output the aperture diaphragm 3. The light spots are uniform, interference fringes and noise points of laser are avoided, and the homogenization requirement of a background light source is met.
Two side faces of the dye cell 1, through which laser passes, are quartz windows, and the rest four faces of the dye cell 1 are provided with frosted materials. The surface of the quartz window facing the outer side of the dye cell 1 is plated with a visible light broadband antireflection film. The dye cell 1 is sealed by a sealant. The dye cell 1 is sealed with a sealant to prevent the dye from evaporating. The wavelength of the laser light source is 532 nm. The concentration of the rhodamine B liquid fluorescent substance is 0.6 mg/L.
The invention provides a method for realizing laser homogenization by using rhodamine B as a medium, and an ideal homogenization effect is achieved. The invention creatively designs the dye cell 1, researches the concentration of the dye, the fluorescence intensity and the characteristics of the excitation conversion efficiency, and reasonably configures the optimal dye concentration aiming at a laser light source with the wavelength of 532 nm. The invention creatively designs the light condensing system 2, shapes and outputs the fluorescence generated by exciting the fluorescent substance by the laser, and achieves the homogenization effect. The light source obtained by homogenization is very uniform in background, free of interference fringes and noise points of laser, stable in output, uniform and impurity-free in background picture for a long time, and the problems of periodic light spot arrays and uneven brightness are solved.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (8)
1. A homogenization system of a pulse laser light source is characterized by comprising a laser light source, a dye pool (1) and a light condensing system (2) which are sequentially arranged, wherein a rhodamine B liquid fluorescent substance is added in the dye pool (1), and two cemented lenses are arranged in the light condensing system (2); the concentration of the rhodamine B liquid fluorescent substance is 0.4 mg/L-0.6 mg/L.
2. The system for homogenizing a pulsed laser light source according to claim 1, characterized in that the two sides of the dye cell (1) through which the laser passes are quartz windows, and the remaining four sides of the dye cell (1) are provided with frosted material.
3. The system for homogenizing a pulsed laser light source according to claim 2, characterized in that the surface of the quartz window facing the outside of the dye cell (1) is coated with a visible light broadband antireflection film.
4. The system for homogenizing a pulsed laser light source according to claim 1, characterized in that the dye cell (1) is sealed with a sealing glue.
5. The system of claim 1, wherein the laser source has a wavelength of 532 nm.
6. A method of homogenizing a pulsed laser light source using the system of claim 1, comprising the steps of:
s1: irradiating the dye cell (1) filled with the rhodamine B liquid fluorescent substance by laser to excite to generate fluorescence;
s2: the fluorescence is focused and shaped by a cemented lens of the light-gathering system (2) and is output to the aperture diaphragm (3).
7. The method for homogenizing a pulsed laser light source according to claim 6, characterized in that the two sides of the dye cell (1) through which the laser passes are quartz windows, and the remaining four sides of the dye cell (1) are provided with frosted materials.
8. The method for homogenizing a pulsed laser light source according to claim 6, wherein the concentration of the rhodamine B liquid phosphor is 0.4mg/L to 0.6 mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111638349.4A CN114002858B (en) | 2021-12-30 | 2021-12-30 | Homogenizing system and method of pulse laser light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111638349.4A CN114002858B (en) | 2021-12-30 | 2021-12-30 | Homogenizing system and method of pulse laser light source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114002858A CN114002858A (en) | 2022-02-01 |
| CN114002858B true CN114002858B (en) | 2022-03-15 |
Family
ID=79932461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111638349.4A Active CN114002858B (en) | 2021-12-30 | 2021-12-30 | Homogenizing system and method of pulse laser light source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114002858B (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05291660A (en) * | 1992-04-09 | 1993-11-05 | Toshiba Corp | Dye laser amplifier |
| JP3467995B2 (en) * | 1996-11-28 | 2003-11-17 | 株式会社日立製作所 | Capillary electrophoresis device |
| CN204680896U (en) * | 2015-06-18 | 2015-09-30 | 中国工程物理研究院激光聚变研究中心 | A kind of device improving LD pumping homogeneity |
| US20190154560A1 (en) * | 2016-05-16 | 2019-05-23 | Abbvie Inc. | Systems and Methods for Identifying Protein Aggregates in Biotherapeutics |
| CN106838821B (en) * | 2017-02-21 | 2020-01-21 | 中国科学院半导体研究所 | Homogenized white light source and homogenizing method thereof |
| CN108944032A (en) * | 2017-05-19 | 2018-12-07 | 中国科学院化学研究所 | A kind of system printing laser light source |
| CN112014064B (en) * | 2020-10-27 | 2021-01-05 | 中国空气动力研究与发展中心高速空气动力研究所 | Wind tunnel complex flow color fluorescent oil flow test method |
| CN112631055A (en) * | 2020-12-25 | 2021-04-09 | 四川长虹电器股份有限公司 | Solid-liquid dual-state speckle eliminating device and laser projection light source |
| CN113072561A (en) * | 2021-03-29 | 2021-07-06 | 华东理工大学 | Synthesis method of long-wavelength asymmetric rhodamine dye |
-
2021
- 2021-12-30 CN CN202111638349.4A patent/CN114002858B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114002858A (en) | 2022-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9915861B2 (en) | Device for converting wavelength and projection light source | |
| CA2047086C (en) | Diffusion reflector | |
| US20110110389A1 (en) | Laser Oscillator | |
| JP5952735B2 (en) | Light-emitting solar energy concentrator with new structure | |
| CN114002858B (en) | Homogenizing system and method of pulse laser light source | |
| CN113568265A (en) | Projection lighting system | |
| CN111007688B (en) | Light source device | |
| CN210007099U (en) | Dye laser device with Nile red organic solvents as gain media | |
| WO2023087794A1 (en) | Light source system | |
| CN111240026A (en) | Laser lighting device | |
| CN214222794U (en) | Light emitting device and lamp | |
| CN210201153U (en) | Medium-long wave infrared laser | |
| CN212229342U (en) | Reflective laser lighting structure | |
| CN212029396U (en) | Laser illumination structure and car high beam | |
| CN210345054U (en) | Laser light source device capable of generating white light | |
| JPWO2022234830A5 (en) | ||
| RU2247451C1 (en) | Solid state laser | |
| CN114578574A (en) | Light source device | |
| CN108730922B (en) | Laser generating device and implementation method thereof | |
| TW201445075A (en) | Solar simulator | |
| CN217785038U (en) | Light source module capable of emitting yellow light | |
| RU2002116304A (en) | Laser image projection method and laser projector | |
| JPH0738476B2 (en) | Slab type solid state laser oscillator | |
| Ohta et al. | Angle-Resolved Measurement of Photoluminescence Spectra for Illumination and Display Applications | |
| CN109488934B (en) | Illumination source based on non-rotating wavelength conversion material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |