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Acousto-optic filter

A filter, acousto-optic deflector technology, used in instruments, optics, nonlinear optics, etc.

Active Publication Date: 2010-05-12
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, it is necessary to provide an acousto-optic filter that can solve the problem of dispersion effect in view of the dispersion effect of traditional acousto-optic devices used to manipulate femtosecond lasers

Method used

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0018] image 3 is a schematic diagram of the acousto-optic filter. The acousto-optic filter includes a first lens 5 , a second lens 6 , a first acousto-optic deflector 7 , a second acousto-optic deflector 8 , and a liquid crystal spatial light modulator 9 located on the same optical path.

[0019] The focal lengths of the first lens 5 and the second lens 6 (represented by F in the figure) are equal, and the back focus of the first lens 5 coincides with the front focus of the second lens 6 . The first acousto-optic deflector 7 and the second acousto-optic deflector 8 are respectively placed on the front focus of the first lens 5 and the back focus of the second lens 6, and the first acousto-optic deflector 7 and the second acousto-optic deflector 8 are are identical and operate at the same frequency. The liquid crystal spatial light modulator ...

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Abstract

The invention discloses an acousto-optic filter. The acousto-optic filter comprises two lenses, two acousto-optic deflectors and a liquid crystal spatial light modulator. The focal distances of the two lenses are equal, and the two lenses are arranged in a confocal way; the two acousto-optic deflectors are completely the same and are respectively arranged at the front focal points and the back focal points of the two lenses; and the liquid crystal spatial light modulator is arranged at the common focal point of the lenses and provides an adjustable phase for carrying out color dispersion effect. The invention can realize microsecond stage quick switching between a plurality of wavelength lasers. Furthermore, the collinearity of emergent light beams and incident light beams can be kept, the adjustment of a light path is convenient, and the color dispersion effect of femtosecond lasers is completely eliminated. The invention has compact structure and easy adjustment and can be widely applied to a plurality of research fields of femtosecond laser biologic imaging, optical storage, micro-machining and the like.

Description

【Technical field】 [0001] The invention relates to an acousto-optic filter. 【Background technique】 [0002] Due to the advantages of short pulse duration and high peak power, femtosecond laser has very important applications in the fields of biological imaging, optical storage and microfabrication, and has become one of the hot spots in the field of laser applications at home and abroad in recent years. The primary problem that needs to be solved when acousto-optic devices are used to manipulate femtosecond lasers is the dispersion effect. Dispersion effects include spatial dispersion effects and temporal dispersion effects. [0003] The acousto-optic crystal contained in a conventional acousto-optic device is a high-dispersion medium. After the femtosecond laser passes through the acousto-optic crystal, the pulse will be severely broadened. This effect is called time dispersion (such as figure 1 shown). At the same time, the deflection angle of the beam after passing thro...

Claims

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Application Information

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IPC IPC(8): G02F1/11
Inventor 李德荣张春阳
Owner SHENZHEN INST OF ADVANCED TECH
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