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Optical system with focal length regulatable long-distance axial focusing

A focusing optical system, long-distance technology, applied in optics, optical components, lasers, etc., can solve the problems of difficult to achieve self-guided propagation, hinder the further propagation of laser light, that is, shielding effect, etc., achieve simple structure, continuously adjustable length, laser High utilization effect

Inactive Publication Date: 2004-05-05
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it is not suitable for high-density plasma in the air, because the generation of high-density plasma will absorb the subsequent laser and hinder the further propagation of the laser, that is, the shielding effect
In addition, it is also difficult to achieve long-distance self-guided propagation for laser pulses with longer pulse widths

Method used

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  • Optical system with focal length regulatable long-distance axial focusing
  • Optical system with focal length regulatable long-distance axial focusing
  • Optical system with focal length regulatable long-distance axial focusing

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Experimental program
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Embodiment Construction

[0030] Take lens materials with uniform refractive index distribution, such as optical glass, as an example to form two lenses 1 and 2 . The refractive index n=1.5 of its optical glass, incident light beam radius d is 25mm, the radius E of plano-concave spherical lens 1 gets 26mm, and radius of curvature R is 50mm, so, after incident light beam exits through plano-concave spherical lens 1, according to formula ( 1), the divergence angle α of the outer light is

[0031]

[0032] The radius D of the plano-convex conical lens 2 is 100 mm. According to the above formula (4), the angle γ between the generatrix of the conical surface and the lens plane must satisfy:

[0033]

[0034] Take γ equal to 34.5°. Correspondingly, the apex angle β of the conical surface of the plano-convex conical lens 2 is 111°.

[0035] According to the above formula (2), after the outer light beam passes through the plano-convex conical lens 2, the exit angle θ has

[0036] sin ...

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Abstract

The invention relates to an optical system with adjustable length of focal line for focusing axial line of long range. The system consists of plane-concave spherical lens and plane-convex conical lens mainly. Two lenses are made from material of same refractive index, and two central axes are on same line. The plane of the plane convex conical lens faces to the concave surface of the plane-concave spherical lens, being placed parallel back and forth. Radius of the plane-convex conical lens is larger than the radius of the plane-concagve spherical lens. Circular parallel laser beam, whose optical axis is coaxial with central axis of the lens system, is perpendicularly incident to the plane of the plane-concave spherical lens. Divergent laser beam from the concave enters to the plane-convex conical lens, with light beam being converged on the central axis. Adjusting the distance between two lenses changes length of the focal line.

Description

Technical field: [0001] The present invention is a long-distance axial line focusing optical system with continuously adjustable focal line length, which is suitable for exciting high-power laser beams used in long-distance linear plasma in air, or for axial line focusing of laser beams occasions. Background technique: [0002] In the experiment of studying high-power laser excitation of slender linear plasma in air, it is necessary to continuously focus and distribute the laser along the axial direction to form a slender direct focal line, which generally requires a radial width of tens of microns and an axial length of more than several meters , and the length should be continuously adjustable in order to change the energy density on the focal line. [0003] In general laser line focusing experiment, be to utilize cylindrical lens (referring to prior art [1] Wang Zhijiang chief editor, optical technology handbook, Mechanical Industry Press, Beijing first edition in Novemb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/035G02B27/40H01S3/00
Inventor 陈建平徐至展
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI