CN203941345U - A kind of generation is similar to the optical system of losing light beam without diffraction zeroth order horse - Google Patents
A kind of generation is similar to the optical system of losing light beam without diffraction zeroth order horse Download PDFInfo
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- CN203941345U CN203941345U CN201420005956.6U CN201420005956U CN203941345U CN 203941345 U CN203941345 U CN 203941345U CN 201420005956 U CN201420005956 U CN 201420005956U CN 203941345 U CN203941345 U CN 203941345U
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Abstract
The utility model discloses a kind of approximate optical system of losing light beam without diffraction zeroth order horse that produces, it comprises optical table, on this optical table, be placed with laser instrument, along the light path of this laser instrument, place successively post lens, short focal length lens, long-focus lens and axle pyramid; Wherein, short focal length lens is placed near the focus of post lens, and the focus of short focal length lens and the focus of long-focus lens overlap.By optical system of the present utility model, can produce and a kind ofly approximately without diffraction zeroth order horse, lose light beam, for obtaining zeroth order horse, lose light beam and provide a kind of succinct, effectively new way.This light beam can be for Materialbearbeitung mit Laserlicht, alignment measurement, the fields such as optical wireless communication.
Description
Technical field
The utility model relates to optical field, and specifically a kind of generation is similar to the optical system of losing light beam without diffraction zeroth order horse.
Background technology
The concept of Beams is that the Durnin of the 1987 Nian You U.S. proposes, and because its distribution of light intensity on the direction of propagation has the characteristic not changing with propagation distance, receives a large amount of concerns.Beams is one group of special solution of space free scalar wave equation, we known Bessel beams (bessel beam) is the one group solution of this wave equation under cylindrical-coordinate system, if solve this wave equation under elliptic cylinder coordinates, just can obtain another group and separate, it is exactly Mathieu beams (horse is lost light beam).The same with non-diffraction Bessel beam, horse is lost light beam also can be for optical measurement, optical lithography, medical imaging, the fields such as nonlinear optics and light channel radio.
At present, the method that generation zeroth order horse is lost light beam has multiple: as computer-generated hologram method, and circumferential weld lens method, laserresonator method etc.But computer-generated hologram method need to be used computing machine and spatial light modulator, high and the system complex of cost, laserresonator method debugging laser cavity difficulty is large and equipment cost is high, though circumferential weld lens method is simple, but clear aperature is little, therefore the efficiency of light energy utilization is low, is unfavorable for that horse loses the practical application of light beam.
Utility model content
The purpose of this utility model be to provide a kind of energy quick and easy, produce approximate optical system of losing light beam without diffraction horse expeditiously.
To achieve these goals, the utility model adopts following technical scheme:
Produce an approximate optical system of losing light beam without diffraction horse, comprise optical table, on this optical table, be placed with laser instrument, along the laser optical path of this laser instrument, place successively post lens, short focal length lens, long-focus lens and axle pyramid; Wherein, short focal length lens is placed near the focus of post lens, and the focus of short focal length lens overlaps with the focus of long-focus lens.
Above-mentioned laser instrument is He-Ne laser instrument.
Above-mentioned post lens are projection lens.
Above-mentioned short focal length lens and above-mentioned long-focus lens form a collimating and beam expanding system, and the enlargement factor of this collimating and beam expanding system regulates by choosing the different focal lengths of lens.
Above-mentioned axle pyramid is traditional refraction profile shaft pyramid.
Adopt after such scheme, the laser beam sending when laser instrument is first Elliptical Gaussian Beam through post lens transformation, and then after collimating and beam expanding system collimator and extender, then the focusing of warp beam pyramid, in last distance certain after axle pyramid, form to be similar to and loses light beam without diffraction horse.This optical system structure is very simple, and the axle pyramid advantages such as to have optical damage threshold high, and clear aperature is large, therefore with axle pyramid generation horse, loses light beam simpler than computer-generated hologram method resonant cavity method, and cost is low, higher than circumferential weld lens method efficiency.Therefore the utility model approximate lost light beam without diffraction horse and is provided a kind of succinct for obtaining, efficiently new way.The fields such as in actual applications, particularly laser material is processed, biomedical have special meaning.
Accompanying drawing explanation
Fig. 1 is the theory of constitution figure of the utility model optical system;
Fig. 2 is the light path schematic diagram of the utility model optical system;
Fig. 3 is the computer simulation hot spot figure of the utility model optical system.
Fig. 4 is the experiment hot spot figure of the utility model optical system.
Embodiment
In order further to explain, below by specific embodiment, the utility model system is described in detail the technical scheme of the utility model system.
A kind of approximate optical system of losing light beam without diffraction horse that produces of the present utility model, as shown in Figure 1, comprise optical table 1 and use respectively the laser instrument 2 of fixed support 7 supporting and locations on optical table 1, post lens 3, short focal length lens 4, long-focus lens 5 and axle pyramid 6.Laser instrument 2 is arranged on optical table 1 by fixed support 7, along the laser optical path of this laser instrument 2, places successively post lens 3, short focal length lens 4, long-focus lens 5, axle pyramid 6, and microscope and CCD camera arrangement 8.
Laser instrument 2 adopts He-Ne laser instrument.
Post lens 3 adopt convex-surface type post lens.
Short focal length lens 4, near the focus of post lens 3, does not require that short focal length lens 4 strictly overlaps with the focus of post lens 3.
The focus of the focus of short focal length lens 4 and long-focus lens 5 overlaps, and by short focal length lens 4 and long-focus lens 5, forms a collimating and beam expanding system, and the enlargement factor of collimating and beam expanding system can regulate by choosing the different focal lengths of lens as required.
Axle pyramid 6 adopts traditional refraction profile shaft pyramid.Axle pyramid 6 is placed on the rear of long-focus lens 5 along light path, distance is not limit.
Microscope and CCD photographic system 8 are an integral body, are used for taking the hot spot distribution at different propagation distance place.
During work, as shown in Figure 2, first He-Ne laser instrument 2 is opened, laser beam is transformed to Elliptical Gaussian Beam through post lens 3, and then after short focal length lens 4 and long-focus lens 5 collimator and extenders, on axle pyramid 6, form a long and narrow oval-shaped hot spot, in the rear certain distance of axle pyramid 6, form to be similar to and lose light beam without diffraction horse, its maximum can be by formula Z without diffraction propagation distance
max≈ a/[(n-1) γ] approximate treatment obtains, and wherein a is the major axis radius that incides the ellipse light spot on axle pyramid 6, and n is the refractive index of axle pyramid 6, and γ is the base angle of axle pyramid 6.
As embodiment, we select the focal distance f=300mm of projection lens 3, focal distance f=the 190mm of the focal distance f=15mm of short focal length lens 4, long-focus lens 5, γ=0.5 °, base angle of axle pyramid 6, refractive index n=1.458, during experiment, build light path system according to the light path of Fig. 2, in the rear a distance of axle pyramid 6, with microscope and CCD camera 8, take, shooting results as shown in Figure 4.For confirmatory experiment and theoretical consistance, according to Fresnel diffraction integral theory, γ=0.5 °, base angle of our chosen axis pyramid 6, refractive index n=1.458, incide the major axis radius ω of the hot spot of the Elliptical Gaussian Beam on axle pyramid 6
x=5mm, minor axis radius ω
y=1.5mm is as parameter, carry out numerical simulation calculation obtain zero-order approximation after axle pyramid 6 without diffraction mathieu light beam the surface of intensity distribution at different propagation distance place, as shown in Figure 3.It is 5mm that experiment records the major axis radius that incides the ellipse light spot on axle pyramid 6, utilizes formula Z
max≈ a/[(n-1) γ] the maximum the non diffracting distance that calculates is about 625mm, and the maximum the non diffracting distance that experiment records is 610mm, and experiment meets substantially with theory.
Thus, this optical system approximate lost light beam without diffraction horse and is provided a kind of succinct, effective method for obtaining.In actual applications, particularly for laser material, process, the fields such as biomedicine have special meaning.
The product form of above-described embodiment and graphic and non-limiting the utility model system and style, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not departing from the patent category of the utility model system.
Claims (5)
1. one kind produces approximate optical system of losing light beam without diffraction zeroth order horse, it is characterized in that: comprise optical table, on this optical table, be placed with laser instrument, along the laser optical path of this laser instrument, place successively post lens, short focal length lens, long-focus lens and axle pyramid; Wherein, short focal length lens is placed near the focus of post lens, and the focus of short focal length lens overlaps with the focus of long-focus lens.
2. a kind of approximate optical system of losing light beam without diffraction zeroth order horse that produces as claimed in claim 1, is characterized in that: above-mentioned laser instrument is He-Ne laser instrument.
3. a kind of approximate optical system of losing light beam without diffraction zeroth order horse that produces as claimed in claim 1, is characterized in that: above-mentioned post lens are projection lens.
4. a kind of generation as claimed in claim 1 is similar to the optical system of losing light beam without diffraction zeroth order horse, it is characterized in that: above-mentioned short focal length lens and above-mentioned long-focus lens form a collimating and beam expanding system, and the enlargement factor of this collimating and beam expanding system regulates by choosing the different focal lengths of lens.
5. a kind of approximate optical system of losing light beam without diffraction zeroth order horse that produces as claimed in claim 1, is characterized in that: above-mentioned axle pyramid is traditional refraction profile shaft pyramid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420005956.6U CN203941345U (en) | 2014-01-06 | 2014-01-06 | A kind of generation is similar to the optical system of losing light beam without diffraction zeroth order horse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420005956.6U CN203941345U (en) | 2014-01-06 | 2014-01-06 | A kind of generation is similar to the optical system of losing light beam without diffraction zeroth order horse |
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| CN203941345U true CN203941345U (en) | 2014-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420005956.6U Expired - Fee Related CN203941345U (en) | 2014-01-06 | 2014-01-06 | A kind of generation is similar to the optical system of losing light beam without diffraction zeroth order horse |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760673A (en) * | 2014-01-06 | 2014-04-30 | 华侨大学 | Optical system for generating approximate diffraction-free zero-order Mathieu beam |
| CN108319029A (en) * | 2018-02-01 | 2018-07-24 | 浙江师范大学 | Amplitude modulation generates the method that horse loses light beam |
-
2014
- 2014-01-06 CN CN201420005956.6U patent/CN203941345U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760673A (en) * | 2014-01-06 | 2014-04-30 | 华侨大学 | Optical system for generating approximate diffraction-free zero-order Mathieu beam |
| CN108319029A (en) * | 2018-02-01 | 2018-07-24 | 浙江师范大学 | Amplitude modulation generates the method that horse loses light beam |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141112 Termination date: 20170106 |