Study of spontaneous emission coefficients of argon ion by means of a quasi-sidelight method

We report the measurements of the change of the spontaneous emission coefficients of Ar ion in the high-intensity laser field by means of a quasi-sidelight method and a spatial filter technique. The variances of A coefficients are found depending on the changes of orbital angular momentum Δ L and total angular momentum Δ J of Ar ion and the intensity of the light field in the laser cavity.