helium-cesium gas laser
氦铯气体激光器

• periodic frequency modulation
• periodic function
• periodic gas lens
• periodic inversion saturation
• periodicity
• periodic law
• periodic modulation
• periodic motion
• periodic potential
• periodic quantity
• periodic relaxation oscillation
• periodic relaxation pulse
• periodic single pulse
• periodic table
• period of otpical cycle
• period of S.H.M
• periodogram
• peripheral
• periphery
• periscope
• periscopeheight
• periscope range finder
• periscopic lens
• peritoneoscope
• permaliner