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Beam-divergence angle control method based on heat effect

A technology of beam divergence angle and control method, applied in the field of laser, can solve problems such as being unsuitable for real-time target tracking, time-consuming and labor-intensive, etc., and achieve the effect of rapid and controllable divergence angle

Inactive Publication Date: 2016-05-25
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, this is time-consuming and labor-intensive, and is not suitable for real-time tracking of targets.

Method used

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  • Beam-divergence angle control method based on heat effect
  • Beam-divergence angle control method based on heat effect
  • Beam-divergence angle control method based on heat effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, a beam divergence angle control method based on thermal effect, including output wavelength λ 1 The first laser 1, the output wavelength is λ 2 The second laser 3, the coated plane mirror (optical path adjustment device 2) with a 45° angle to the horizontal direction and the medium 4 doped with Nd:YAG.

[0024] The wavelength emitted by the first laser 1 is λ 1 The beam of =532nm wavelength enters the medium 4 doped with Nd:YAG after being irradiated to a plane mirror at an angle of 45° along the horizontal direction, and the optical path adjustment device 2 is a coated plane mirror; the coated plane mirror is placed on the output optical path of the first laser 1 at 45 degrees, and the coating The plane mirror makes the wavelength λ emitted by the first laser 1 1 After the light beam is fully transmitted, it enters the central optical axis of the Nd:YAG medium 4, and the medium 4 also fully transmits the 532nm wavelength light beam. The s...

Embodiment 2

[0026] Such as figure 2 As shown, a beam divergence angle control method based on thermal effect, including output wavelength λ 1 The first laser 1, the output wavelength is λ 2 The second laser 3, the coated plane mirror (optical path adjustment device 2) with a 45° angle to the horizontal direction and the medium 4 doped with Nd:YAG. The wavelength emitted by the second laser 3 is λ 2 The beam of =808nm wavelength is irradiated on the optical path adjustment device 2 along the horizontal direction, and the optical path adjustment device 2 is a coated plane mirror; the coated plane mirror is placed on the output optical path of the second laser 3 at 45 degrees, and the coated plane mirror makes the wavelength λ emitted by the second laser 3 2 After the beam is fully transmitted, it enters the central optical axis of the Nd:YAG medium 4, and the medium 4 can fully absorb the 808nm wavelength beam. The second laser 3 emits a wavelength of λ 2 The light beam emitted by the ...

Embodiment 3

[0028] Such as Figure 4 As shown, there is a lens group 6 between the second laser 3 and the optical path adjusting device 2 . The lens group 6 performs beam shaping on the second laser 3, so that the spatial distribution of the 808nm laser beam output by the second laser 3 is improved.

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Abstract

The invention relates to a beam-divergence angle control method based on a heat effect. The beam-divergence angle control method is characterized by at least comprising a light path adjusting device, a medium, a first laser and a second laser, wherein the first laser emits a light beam of which the wavelength is lambda1 and outputs the light beam through the medium, and the second laser emits a light beam of which the wavelength is lambda 2 for entering the medium, so that a thermal lens is formed on a light axis of the medium through which the first laser passes, the power of the second laser is changed, the focus length of the thermal lens is adjusted, and an output divergence angle of the first laser is changed due to the focus change of the thermal lens. By adopting the beam-divergence angle control method, a laser beam control system is adjusted as required under the condition of not changing an optical system in order to control the laser beam divergence angle, so that the aim of continuously changing the laser divergence angle is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to a method for controlling the beam divergence angle based on thermal effects. technical background [0002] In the application of lasers, it is often necessary to change the divergence angle of the emitted laser beam according to the requirements of the application, so as to achieve different irradiation effects. For example, in order to increase the coverage of the target, it is often required to increase the divergence angle of the beam, but in order to increase the irradiation distance, it is necessary to reduce the divergence angle. In order to achieve this, the conventional method is to replace optical lenses with different focal lengths as needed. However, in practical applications, it is time-consuming and labor-intensive, and it is not suitable for real-time tracking of targets. To this end, we propose a variable-focus lens for laser irradiation and receiving systems cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/29
CPCG02F1/29G02F1/294
Inventor 吴梦瑶王石语蔡德芳过振李兵斌
Owner XIDIAN UNIV