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Mechanical light modulation device

A light modulation device and mechanical technology, applied in optics, optical components, instruments, etc., can solve problems such as low drive efficiency, image quality degradation, femtosecond laser pulse broadening, etc., to reduce processing difficulty, improve realization, and avoid samples Effects of overexposure or dye bleaching

Inactive Publication Date: 2018-06-29
NYMPH TIANJIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 2. Resonant scanning After completing hundreds of lines of scanning in each frame, the scanning head needs to return to the starting position of the next frame. This process takes about the time it takes to complete several lines of scanning. At the same time, it is necessary to cut off the laser input to achieve field elimination. In addition, resonant scanners usually have two modes of unidirectional scanning and bidirectional scanning. Compared with bidirectional scanning mode, unidirectional scanning mode also has the problem of backhaul blanking, which also leads to a decrease in scanning efficiency.
[0005] 3. In order to realize the fast turn-on and turn-off of the laser input by the resonant scanner, the Pockels cell based on the electro-optic modulation effect and the acousto-optic modulator based on the acousto-optic modulation effect are widely used at present, and the acousto-optic modulation has a higher extinction ratio than the electro-optic modulation. (Generally greater than 1000:1), and the driving efficiency is lower, the temperature stability is excellent, the light spot quality is better, and the price is lower, but its dispersion is serious, which will obviously broaden the femtosecond laser pulse, resulting in a decline in image quality, and at the same time , both measures make the cost high

Method used

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Embodiment 1

[0034]Implementation Example 1: The diameter of each chopping chip 201 is 100 mm, and the chip includes a complete blanking structure for realizing one frame scanning. Therefore, the rotational speed of the motor 202 is 1800 rpm, which is equivalent to 30 fps. The part near the circumference of the chopping sheet 201 is divided into 520 equal parts (15600 divided by 30), wherein 512 equal parts are partially punched, and the area of ​​perforated in each equal part accounts for 88% of each part, and the area without holes Accounting for 12%, corresponding to 88% of each row of approximately uniform scanning and 6% of the leftmost and 6% of the blanking part of the rightmost, the perforated part allows the laser to pass through; the non-perforated part completely blocks the laser. The remaining 8 equal parts are not perforated, which corresponds to the process that the scanning head returns to the starting position of the first line of the next frame after the end of each frame....

Embodiment 2

[0035] Implementation example two: the motor 202 rotating speed increases N times, then the number of scanning lines that each chopping plate 201 comprises reduces N times, the laser beam diameter by chopping light 201 increases N times, can reduce the processing of chopping plate 201 like this Difficulty and implementation difficulty of focusing light path. Take the C-995 mechanical chopper of British Scitec Company as an example, the maximum speed of its electric motor is 10020rpm. In this application, the rotational speed of the motor 302 can be set to 9000rpm, which is increased by 5 times, and the number of scanning lines included in each chopping piece 201 is reduced by 5 times to 104 lines, and the diameter of the laser beam passing through the chopping piece 201 increases. 5 times larger at 4.75um. On this basis, if the chopping plate 201 is replaced with a light metal material, such as aluminum, and the weight of the chopping plate 201 is kept small, the diameter of ...

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Abstract

The invention provides a mechanical light modulation device which comprises a control part and a chopper device. The chopper device is electrically connected with the control part, the control part comprises an external synchronous signal interface, a phase-locked loop and a servo motor controller, the chopper device comprises a chopping sheet and a motor, the chopping sheet is driven by the motorto rotate, and the motor is electrically connected with the servo motor controller. Via the device, high extinction ratio can be realized in the resonant scanning blanking process without a dispersion effect, the production cost is reduced, and the device is suitable for different types of resonant scanning blanking demands.

Description

technical field [0001] The invention relates to the technical field of auxiliary equipment for resonance scanning, in particular to a mechanical light modulation device. Background technique [0002] With the improvement of imaging requirements for living biological samples and rapidly changing physiological activities in the experimental observation process, the resonance scanner has gradually replaced the application of the traditional galvanometer scanner because of its fast scanning. However, the existing resonance scanner is in In actual use, there are the following problems: [0003] 1. The resonant scanner works in an open-loop state, and its scanning speed presents an approximately sinusoidal change in each row, so that when the resonant scanner scans the central part (about 88%) of each row, its scanning speed is approximately uniform, while scanning At both ends of each row, the scanning speed is too slow, which may easily lead to overexposure of the sample, dye b...

Claims

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Application Information

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IPC IPC(8): G02B26/04G02B26/10
CPCG02B26/04G02B26/10
Inventor 徐强
Owner NYMPH TIANJIN TECH
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