A single-choice laser with continuously adjustable repetition rate derived from external trigger signal

Abstract

The invention relates to an external trigger signal derivation to achieve a single-selection laser with continuously adjustable repetition frequency, which is characterized in that the specific steps are as follows: 1) according to the collected signal, it is sent to the FPGA, and the FPGA outputs a signal at the same time after reading it to drive the Q switch. After a certain time delay, the second signal is output, and the second signal is used to drive the laser; 2) The first signal drives the Q switch, and the signal is synchronized with the rising edge of the external signal; 3) The delay after the first signal is output After a certain period of time, the first pulse of the second signal is output, and then the second pulse is output again according to the frequency band that the laser needs to work. 4) The period of the final output signal of the laser is synchronized with the first signal. It can realize arbitrary coded pulse input, achieve very high-precision pulse cycle interval control, and the relative delay between each laser signal and the input pulse signal is fixed.

Description

technical field [0001] The invention relates to a single-selection laser capable of continuously adjusting repetition frequency by derivation of an external trigger signal, which is a method for realizing external triggering by selecting a single laser pulse, that is, using an external trigger signal to control the timing sequence of an acousto-optic Q switch, and belongs to the field of optoelectronics. Background technique [0002] MOPA lasers have become a mainstream product in the laser market. However, in order to avoid spontaneous radiation during amplification, this type of laser has a high repetition rate. Due to some special applications, many users need low repetition rate output and need to use their own The trigger signal is used to control the synchronization, which requires the pulse selection operation of the MOPA laser. After the high-frequency laser is output, let it pass through an open and close door that can control the length of time. When the door is op...

AI Technical Summary

Problems solved by technology

[0006] In addition to the above, using the synchronization signal of the laser to control the opening time of the Q switch cannot achieve continuous adjustment at low repetition rates.

For example, for a 10kHz laser pulse, choose one for every ten pulses, and the output laser pulse frequency is 1KHz, choose one for every eleven, the laser pulse frequency is 909Hz, choose one for every twelve, the frequency is 833Hz, and so on, The selected frequencies are always spaced, not continuous, which will affect users, and some key experimental results may not be observed

Images