CN1448810A - Method for writing double holographic grating by single pulse laser once - Google Patents
Method for writing double holographic grating by single pulse laser once Download PDFInfo
- Publication number
- CN1448810A CN1448810A CN 03116346 CN03116346A CN1448810A CN 1448810 A CN1448810 A CN 1448810A CN 03116346 CN03116346 CN 03116346 CN 03116346 A CN03116346 A CN 03116346A CN 1448810 A CN1448810 A CN 1448810A
- Authority
- CN
- China
- Prior art keywords
- pulse
- transparent medium
- laser
- energy density
- pulse laser
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007787 solid Substances 0.000 claims abstract description 19
- 230000000737 periodic effect Effects 0.000 claims abstract description 7
- 239000011521 glass Substances 0.000 claims description 8
- 238000005304 joining Methods 0.000 claims description 7
- 230000002123 temporal effect Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000001427 coherent effect Effects 0.000 abstract description 8
- 238000002679 ablation Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 239000005355 lead glass Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
Landscapes
- Laser Beam Processing (AREA)
Abstract
A method for writing double holographic grating by single pulse laser at one time comprises the following steps: selecting ultrashort pulse laser with pulse width less than 1ps, dividing the ultrashort pulse laser into two beams by a beam splitter, focusing the two beams by two convex lenses, and intersecting the two beams at or near a focus to realize coherence in space and time; selecting a solid transparent medium; controlling the energy of a single pulse output by a laser, so that the energy density of each pulse after beam splitting is smaller than the threshold energy density required by the ablation of the transparent medium, but the energy density reached when the interference phase is generated is just larger than the threshold energy density required by the ablation of the solid transparent medium; and converging the two beams of coherent ultrashort pulse laser to act on the surface of the transparent medium, and simultaneously generating two periodic microstructures to form the double-holographic micro grating once.
Description
Technical field
The present invention relates to holographic grating, the enjoy a double blessing method of breath grating of particularly a kind of monopulse laser one-time write specifically, is that a kind of pulse width of utilizing is less than 1ps (10
-12Second) the interference of ultra-short pulse laser, in the enjoy a double blessing method of breath grating of solid transparent dielectric surface one-time write.
Background technology
General holographic grating is to make formation with long pulse even the relevant photochromics of inducing of continuous laser.Pulse width is less than 1ps (10
-12Second) ultra-short pulse laser, has high peak light intensity because of pulse width is very short, the preparation of photochromics (as photorefractive crystal, photopolymerization material) holographic grating can not only be used for, and the preparation of non-photosensitive materials (as film and various transparent glass material) grating can be used for.At present, people such as Jinhai Si use relevant femtosecond pulse at inorganic thin film (Appl.Phys.Lett., Jinhai Si etc., American Institute of Physics, 2002,81 (5): induced 832～834) to form the low-light grid, people such as Yan Li use relevant femtosecond pulse in glass medium (Appl.Phys.Lett., Yan Li etc., American Institute of Physics, 2002,80 (9): also induce the low-light grid 1508～151).But above-mentioned two methods have a common drawback, and that is exactly single output pulse through beam splitting, focuses on produce relevant, once can only form low-light grid.If in several microns to tens microns scope, the a plurality of microstructure grating array of once relevant generation, and the size of these a plurality of microstructures can change, integrated device making to optical information storage and micro-optic field more is of practical significance, as: micro elements such as optical memory, low-light grid, quantum line.
Summary of the invention
The problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, and the integrated possibility that provides in optical storage and micro-optic field is provided the method that provides a kind of monopulse laser one-time write to enjoy a double blessing the breath grating, and the method also can be used for the preparation of quantum line.
The enjoy a double blessing essence of method of breath grating of monopulse laser one-time write of the present invention is to use ultra-short pulse laser through beam splitting after implementation space and the temporal relevant superposition of pulse width less than 1ps, the one-time write breath grating of enjoying a double blessing in the solid transparent medium, specific practice is:
1, select the ultra-short pulse laser of pulse width for use, be divided into two bundles through beam splitting chip less than 1ps, then by two convex lens focus, and focus or near intersect, be concerned with temporal in the implementation space;
2, select the solid transparent medium for use;
3, the energy of the individual pulse of control laser instrument output, make each pulse energy density after the beam splitting all less than the transparent medium required threshold energy density of ablating, and guarantee to produce and interfere the energy density that reaches when long mutually just greater than the solid transparent medium required threshold energy density of ablating;
4, the relevant ultra-short pulse laser of above-mentioned two bundles is assembled, and made very two pulse actions near joining on above-mentioned transparent medium surface, produce two periodic micro structures simultaneously, the breath low-light grid of enjoying a double blessing are once interfered formation.。
First point of above-mentioned specific practice, select for use pulse width to be: when the pulse width of laser during less than 1ps less than the reason of the ultra-short pulse laser of 1ps, the interference light that focuses on will produce very strong periodically variable coherent field, the periodic structural change of solid-state material be can cause, thereby incident light amplitude and position information mutually in material, noted.
Second point of above-mentioned specific practice, the solid transparent medium can be under relevant ultrashort laser pulse effect, and the ablation effect by coherent field forms periodic structural change, and the information that is stored in the transparent medium can be read with detection light.
Above-mentioned specific practice thirdly makes each laser pulse energy metric density after the beam splitting all less than the solid transparent medium required threshold energy density of ablating, and is to guarantee to produce the individual pulse of interfering can not cause that the solid transparent medium ablates.Energy density after the generation interference is long mutually is greater than the ablation threshold of solid transparent medium, and purpose is the effect by the extremely strong coherent field of ultra-short pulse laser, forms periodic micro structure at the solid transparent dielectric surface.
The 4th point of above-mentioned specific practice, the relevant ultra-short pulse laser of two bundles is assembled, and make very two pulse actions near joining in above-mentioned transparent medium surface, rather than the complete coincide point of assembling of two pulses acts on the transparent medium surface, because laser pulse is a Gauss pulse, its intensity is central shaft symmetry radial distribution, if make the edge part phase-splitting overlapping of a branch of core and another Shu Jiguang in the relevant ultra-short pulse laser of two bundles, just can realize interference and form two periodically coherent fields, and not need two bundle laser centers parts to overlap fully.
The invention has the advantages that: the femtosecond pulse that utilizes single output in the prior art once can only form low-light grid, and the inventive method has tangible difference with it through being concerned with that beam splitting, focusing produce.The first, this method is to utilize single femtosecond pulse, in the implementation space with after temporal being concerned with, once forms two holographic low-light grid, and each grating carries identical amplitude and phase information.The second, in this method, the joining after change two relevant pulses are assembled can change the distance of two holographic gratings of formation to the distance (but must guarantee that the two-beam pulse has mutual overlapping) of solid transparent dielectric surface.The 3rd, in this method, the focal length that changes any one lens in two condenser lenses can change the size of corresponding holographic grating.
The inventive method not only can be used for glass, also can be used for semiconductor, organic film, inorganic thin film and writes the breath grating of enjoying a double blessing.
Description of drawings:
Fig. 1 is the device synoptic diagram that the inventive method is implemented
Fig. 2 is the relevant disposable schematic diagram of inducing the breath low-light grid of enjoying a double blessing of femtosecond pulse of the inventive method.
Fig. 3 is the coherent pulse laser of 50fs for embodiment 1 pulse width, at the breath grating of enjoying a double blessing of quartz glass spatial induction, with the observed result of optical microscope (100 * object lens).
Fig. 4 is the coherent pulse laser of 120fs for embodiment 2 pulse widths, at the breath grating of enjoying a double blessing of lead glass spatial induction, with the observed result of optical microscope (100 * object lens).
Fig. 5 is the coherent pulse laser of 500fs for embodiment 3 pulse widths, at the breath grating of enjoying a double blessing that the K9 glass surface is induced, uses the observed result of optical microscope (100 * object lens).
Embodiment
See also Fig. 1 earlier, Fig. 1 is the device synoptic diagram that the inventive method is implemented.The enjoy a double blessing method of breath grating of monopulse laser one-time write of the present invention specifically comprises the following steps:
1, with pulse width less than the ultra-short pulse laser of 1ps, be divided into two bundles through beam splitting chip, then by two convex lens focus, and focus or near intersect, be concerned with temporal in the implementation space.
2, use the solid transparent medium.
3, the energy of the individual pulse of system laser instrument output, make each pulse energy density after the beam splitting all less than the transparent medium required threshold energy density of ablating, interfere the energy density that reaches when long mutually just greater than the solid transparent medium required threshold energy density of ablating but produce.
4, the relevant ultra-short pulse laser of above-mentioned two bundles is assembled, and makes very two pulse actions near joining in above-mentioned transparent medium surface, produces two periodic micro structures simultaneously, and the breath low-light grid of enjoying a double blessing are once interfered formation.
Embodiment 1:
Selecting pulse width for use is 50fs (5 * 10
-14Second) femtosecond pulse, wavelength is 800nm, and pulse recurrence rate is 1Hz, and pulse energy is 70 μ J, by beam splitting chip light beam is divided into two bundles, and beam diameter is 6mm, the relevant second harmonic by means of frequency-doubling crystal (BBO) generation of two-beam is realized.The angle of two-beam is 45 °, the three-dimensional mobile platform control that sample is handled by computing machine.Two condenser lenses that are 10cm with focal length focus on two light beams apart from about 35 μ m places, quartz glass surface, focus place spot diameter is about 30 μ m, form the breath grating of enjoying a double blessing on the quartz glass surface like this, with the observed result of optical microscope (100 * object lens) as shown in Figure 3, structural cycle is 1 μ m.
Embodiment 2:
Similar to the way of embodiment 1, selecting pulse width for use is 120fs (1.2 * 10
-13Second) ultrashort pulse, wavelength is 800nm, pulse recurrence rate is 5Hz, pulse energy is 80 μ J, beam diameter is 6mm, the angle of two-beam is 45 °, be that two condenser lenses of 15cm and 10cm focus on two light beams and intersect at the focus place with focal length, joining is apart from about 30 μ m places, lead glass surface, the spot diameter of two light beams at the focus place is respectively 35 and 30 μ m, form the breath grating of enjoying a double blessing on the lead glass surface like this, with the observed result of optical microscope (100 * object lens) as shown in Figure 4, structural cycle is 1 μ m.
Embodiment 3:
As the way of embodiment 1, selecting pulse width for use is 500fs (5 * 10
-13Second) ultrashort pulse, wavelength is 800nm, pulse recurrence rate is 10Hz, pulse energy is 90 μ J, the angle of two-beam is 60 °, be that two condenser lenses of 20cm and 10cm focus on two light beams and intersect at the focus place with focal length, joining is apart from the about 40 μ m places of K9 glass surface, the spot diameter of two light beams at the focus place is respectively 50 μ m and 30 μ m, form the breath grating of enjoying a double blessing at the K9 glass surface like this, two holographic raster size are obviously different, and with the observed result of optical microscope (100 * object lens) as shown in Figure 5, structural cycle is 0.8 μ m.
In sum, the present invention utilizes ultra-short pulse laser through beam splitting after implementation space and the temporal relevant superposition of individual pulse width less than 1ps, the write-once breath low-light grid of going into to enjoy a double blessing in the solid transparent medium, the foregoing description has only been enumerated several glass, writes the breath grating of enjoying a double blessing but the inventive method also is used in the surface of materials such as semiconductor, organic film, inorganic thin film.
Claims (2)
1, a kind of monopulse laser one-time write method of breath grating of enjoying a double blessing is characterized in that utilizing pulse width less than 1ps (10
-12Second) the interference of ultra-short pulse laser, in the enjoy a double blessing method of breath grating of solid transparent dielectric surface one-time write, concrete steps are as follows:
(1) select the ultra-short pulse laser of pulse width for use, be divided into two bundles through beam splitting chip less than 1ps, then by two convex lens focus, and focus or near intersect, be concerned with temporal in the implementation space;
(2) select the solid transparent medium for use;
(3) energy of the individual pulse of control laser instrument output, make each pulse energy density after the beam splitting all less than the transparent medium required threshold energy density of ablating, interfere the energy density that reaches when long mutually just greater than the solid transparent medium required threshold energy density of ablating but produce;
(4) the relevant ultra-short pulse laser of above-mentioned two bundles is assembled, and made very two pulse actions near joining in above-mentioned transparent medium surface, produce two periodic micro structures simultaneously, the breath low-light grid of enjoying a double blessing once form.
2, the monopulse laser one-time write according to claim 1 method of breath grating of enjoying a double blessing is characterized in that described solid transparent medium can be glass, or semiconductor, or organic and inorganic film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03116346 CN1448810A (en) | 2003-04-11 | 2003-04-11 | Method for writing double holographic grating by single pulse laser once |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03116346 CN1448810A (en) | 2003-04-11 | 2003-04-11 | Method for writing double holographic grating by single pulse laser once |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1448810A true CN1448810A (en) | 2003-10-15 |
Family
ID=28684164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03116346 Pending CN1448810A (en) | 2003-04-11 | 2003-04-11 | Method for writing double holographic grating by single pulse laser once |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1448810A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102899A (en) * | 2013-07-22 | 2016-11-09 | 凯蒂·库马尔 | Interference formula laser treatment |
-
2003
- 2003-04-11 CN CN 03116346 patent/CN1448810A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102899A (en) * | 2013-07-22 | 2016-11-09 | 凯蒂·库马尔 | Interference formula laser treatment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Salter et al. | Adaptive optics in laser processing | |
| Mills et al. | Embedded anisotropic microreflectors by femtosecond-laser nanomachining | |
| JP4897382B2 (en) | Apparatus for applying optical gradient forces | |
| JP6612915B2 (en) | Microscope and microscope observation method | |
| CN102621823A (en) | Multi-beam parallel laser direct writing device and method | |
| JP2005262290A (en) | Laser beam machining apparatus, laser beam machining method and structure produced by the machining apparatus or machining method | |
| WO2018020911A1 (en) | Metrhod for manufacturing microneedle and device for manufacturing microneedle | |
| CN108319028B (en) | Optical tweezers control method and device based on hollow optical size adjustment | |
| Hasegawa et al. | Polarization distribution control of parallel femtosecond pulses with spatial light modulators | |
| CN1448755A (en) | Method for preparing periodic microstructure on metal film by femtosecond laser | |
| CN106908946A (en) | A kind of dual-beam optical optical tweezers system of simplification | |
| CN1648715A (en) | Method for inducing periodic microstructure on surface of conductive glass | |
| Zhou et al. | Femtosecond multi-beam interference lithography based on dynamic wavefront engineering | |
| Indrisiunas et al. | Direct laser beam interference patterning technique for fast high aspect ratio surface structuring | |
| JPH08220688A (en) | Three-dimensional optical memory glass element and its recording method | |
| Lasagni et al. | High speed surface functionalization using direct laser interference patterning, towards 1 m²/min fabrication speed with sub-μm resolution | |
| Zunino et al. | Dynamic Multifocus Laser Writing with Acousto‐Optofluidics | |
| Kondo et al. | Three-dimensional microfabrication by femtosecond pulses in dielectrics | |
| JP2004126312A (en) | Method and device for three-dimensional holographic recording | |
| Franz et al. | Characterization of a hybrid scanning system comprising acousto-optical deflectors and galvanometer scanners | |
| Poleshchuk et al. | Microstructuring of optical surfaces: Technology and device for direct laser writing of diffractive structures | |
| Savidis et al. | Progress in fabrication of waveguide spatial light modulators via femtosecond laser micromachining | |
| CN1448810A (en) | Method for writing double holographic grating by single pulse laser once | |
| CN1200291C (en) | Working device for forming two-dimensional nanoscale periodic structure by femtosecond laser single pulse | |
| Shao et al. | Volumetric random-access multi-focus scanning based on fast light modulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |