Period-modulated flat-topped pulse device for accurately controlling output power/energy

Abstract

The invention provides a device for realizing period-modulated flat-topped pulses, which comprises a polarized light source, an electro-optical switch, a 1 / 2 wave plate and a polarizing 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 when voltage is applied to the electro-optical crystal; the 1 / 2 wave plate is suitable for rotating the phase of the polarized light output by the electro-optical switch for pi; and the polarizing device is suitable for selectively outputting the received polarized light according to the polarization state of the polarized light. The device for realizing period-modulated flat-topped pulses is characterized in that the electro-optical driving power supply is used for periodically applying half-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, and the 1 / 2 wave plate is suitably shifted out and shifted in an optical path through a driving device. The device realizes the optical regulation for output power / energy, a pump source current does not need to be changed, and therefore the heat focal length of the inner part of a laser device cannot be changed to influence the system stability. Meanwhile, the accuracy is higher, and the tunability is stronger.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a periodic modulation flat-top pulse device for realizing precise control of output power / energy. 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 and falling edges of the waveform of the periodically modulated flat-top pulse generated by the mechanical chopping method are slow, about 10 ms. 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...

AI Technical Summary

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

Images