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High-stability output device for periodically-modulated flat-topped pulse

A technology of output cycle and flat-top pulse, which is applied in the laser field, can solve the problems of easily damaged devices, dust pollution lasers, and inaccurate control of output power/energy accuracy, etc., to achieve easy installation and debugging, lower high voltage, and facilitate engineering promotion Effect

Inactive Publication Date: 2014-07-23
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI +1
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Problems solved by technology

Moreover, the strong laser is on the shutter for a long time, causing dust to contaminate the laser and easily damage the device
In addition, the accuracy of the output power / energy cannot be precisely controlled

Method used

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  • High-stability output device for periodically-modulated flat-topped pulse

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Embodiment Construction

[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0047] In order to better understand the principle of the present invention, the properties of the Faraday rotator and the half-wave plate are firstly introduced.

[0048] There are two types of Faraday rotators, right-handed and left-handed. Right-handed rotation makes the vibration plane / vibration vector of polarized light rotate clockwise by 45°, and left-handed rotation makes the vibration plane / vibration vector of polarized light rotate counterclockwise by 45°. Taking clockwise rotation as an example, the Faraday rotator rotates the incident light 45° clockwise. When polarized light passes through the Farada...

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Abstract

The invention provides a high-stability output device for a periodically-modulated flat-topped pulse. The device comprises a polarized light source, an electro-optical switch, a reflective structure and a first polarization device, wherein the polarized light source is suitable for providing polarized light to be modulated; the electro-optical switch comprises an electro-optical crystal and an electro-optical driving power supply, and the electro-optical crystal is suitable for rotating the phase of the input polarized light for pi / 2 when voltage is applied to the electro-optical crystal; the reflective structure makes the polarized light output by the electro-optical crystal return along the same way; the first polarization device is suitable for selectively outputting the polarized light received from the electro-optical switch according to the polarization state of the polarized light; and the electro-optical driving power supply periodically applies 1 / 4 wave voltage to the electro-optical crystal, so that the polarization state of the polarized light output by the electro-optical crystal is periodically changed. By the device, the optical regulation of output power / energy can be realized, and pumping source current is not required to be changed, so that the influence of a thermal focal length change in a laser on system stability is avoided.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a high-stable output periodic modulation flat top pulse device. Background technique [0002] With the rapid development of laser technology, laser technology plays an increasingly important role in many fields from military to civilian, scientific research to teaching, industry to agricultural and sideline industries. [0003] The existing method for realizing periodic modulation flat-top pulse adopts the method of mechanical chopping, that is, the shutter is used to directly and periodically block light from passing through or not passing through. [0004] The rising edge / falling edge of the waveform of the periodically modulated flat-top pulse generated by the mechanical chopping method is slow, about 10ms. Moreover, the strong laser beam hits the shutter for a long time, causing dust to contaminate the laser and easily damage the device. In addition, the accuracy of the output power / e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/11H01S3/13
Inventor 麻云凤余锦樊仲维赵天卓黄科刘洋张雪
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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