Abstract: The glow discharge characteristics of He/Ne gas mixture in the resonator of laser gyroscope are studied. By establishing the corresponding two-dimensional fluid model, the basic physical equations are numerically solved by COMSOL finite element method, and the discharge characteristics such as discharge voltage, current and spatial distribution of charged particle density are obtained. The effects of applied voltage, mixed gas pressure and mixed gas ratio on the discharge characteristics of mixed gas in the resonator are analyzed and discussed. The results show that with the increase of applied voltage, the maintenance voltage, electron density, He⁺ and Ne⁺ number density increase, and the increase range of electron density is higher than that of He⁺ and Ne⁺. with the increase of air pressure, the maintenance voltage increases gradually, the electron density and He⁺ number density first increase and then decrease, and the extreme value of electron density is 5.85×10¹³cm^-3, the number density of Ne⁺ decreases slightly. With the increase of Ne mass fraction in the gas, the maintenance voltage, electron density and He⁺ number density increase gradually, and the increase range of electron density and He⁺ number density is roughly the same, and the Ne⁺ number density remains basically unchanged.

Key words: laser gyro, gas discharge, electron density, ion density, He/Ne