As the key part for energy amplification of high-power laser systems, disk amplifiers are responsible for more than 99.9% of energy amplification. Cleanliness is one of the key factors that determine the operation efficiency and life of the amplifiers. Therefore, it is especially important to achieve cleanliness control of the amplifiers[1–3]. The traditional cleanliness control method of the disk amplifiers is ‘active intake + passive exhaust’ (AIPE)[4–9]. This method uses clean air or nitrogen as a clean purge gas at a certain pressure. Owing to the particularity of the amplifier structure, it is easy to cause turbulence during the process of AIPE. As a result, the contamination floating with the airflow is difficult to exclude from the amplifier cavity. To completely realize cleanliness control, the most common method is to extend the intake and exhaust times. This method is time consuming and gas consuming. In addition, the use of high-pressure gas (one or two standard atmospheric pressures) in this method, generates certain requirements for the sealing of the amplifier cavity. Later, in order to achieve the cleanliness control of the amplifier, the method of intermittent multiple active intake and passive exhaust (IMAIPE) was developed, that is, the pollutant concentration was diluted by multiple and intermittent intake and exhaust. Finally, the amplifier cavity is clean. Similarly, this method of IMAIPE is also time consuming, gas consuming, and also has some problems and risks caused by high gas pressure. In order to realize the cleanliness control of the amplifier cavity at one time, based on the original cleanliness control method of AIPE, through the reasonable design of air inlets and outlets of different amplifiers, Ren et al.[11,12] realized cleanliness control with almost no turbulence. His findings also indicate that the amplifier cavity can quickly achieve cleanliness control without turbulence. However, this method also uses high-pressure gas directly in the amplifier cavity, without the secondary partial pressure of the gas chamber. The high pressure brings great danger. This method increases gas consumption and is not operable.
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