Method and device for monitoring energy of non-chain pulse chemical laser in real time

Abstract

The invention relates to a method and a device for monitoring energy of a non-chain pulse chemical laser in real time, which realize the non-insertion energy monitoring of a high-power high-repetition-frequency non-chain chemical laser. The method mainly comprises the following steps: firstly, adjusting tunable narrow linewidth laser parameters according to characteristic spectral lines of gas molecules in a laser to be detected; secondly, splitting the tunable narrow linewidth laser beam into beams and respectively and simultaneously irradiating a gain area and a non-gain area of the laser tobe tested; and finally, respectively collecting the laser intensity passing through the gain region and the non-gain region of the laser to be detected to obtain absorption spectrum curves of the gain region and the non-gain region of the laser, and calculating to obtain the energy of each pulse in the process of the laser repeating frequency operation. The concentration of an activating substance (HF molecule) formed by a single pulse of the laser is measured by an optical non-contact method, and the pulse energy of the non-chain pulse chemical laser is obtained by calculation, so that otherlight splitting elements are prevented from being introduced into an output light path of the laser, and the real-time monitoring of the laser energy is realized while the output light path of the laser is simplified.

Description

technical field [0001] The invention relates to the technical field of non-chain pulse chemical laser, in particular to a method and device for real-time monitoring of high-power, high-repetition-frequency non-chain gas chemical laser energy. Background technique [0002] Non-chain pulsed chemical lasers can operate at high repetition rates, and have the characteristics of high peak power and compact structure, and are currently attracting much attention as infrared laser sources. Laser energy is an important parameter to measure the operating status and output performance of the laser, and it needs to be monitored in real time. Usually, an energy meter is used to monitor the laser energy. This method must split the laser beam, which will have a certain impact on the transmission of the laser. When the operating frequency of the laser reaches a high repetition rate above 10kHz, the energy meter is used to monitor the laser energy. very difficult. For the high repetition ra...

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Problems solved by technology

Usually, an energy meter is used to monitor the laser energy. This method must split the laser beam, which will have a certain impact on the transmission of the laser. When the operating frequency of the laser reaches a high repetition rate above 10kHz, the energy meter is used to monitor the laser energy. very difficult

For high repetition frequency operation, the current method is to use a power meter to monitor the average energy of the laser, but this cannot reflect the changes in laser pulse energy in real time

In addition, the laser pulse width is short, the peak power is high, and the energy is large. When the laser is running at a high repetition rate, in order to avoid damage to the energy meter, it is necessary to add an attenuation element to the measurement light, which introduces measurement errors.

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