اندازه گيري بهرۀ محيط فعال ليزر با استفاده از گسيل خودبخودي تقويت شده

Using relation between Amplified Spontaneous Emission intensity and gain, a recursive formula is derived for gain calculation by comparing fluorescence yield in two different length of the active medium. Experimental measurements are carried out and gain is computed by solving the derived formula. For the sake of comparison, measurements are also carried out by probe beam method which shows good agreement between two methods.