Abstract
Spectroscopic measurements on 4F3/2−4I11/2 and 4F3/2−4I9/2 transitions for a Nd3+-doped fiber laser demonstrated that the wavelength dependence of the relaxation oscillations provides a simple method to distinguish three-and four-level transition. Spectral analysis of relaxation oscillations in a tunable Er3+-doped fiber laser was performed at liquid-nitrogen temperature, and results were compared with measurements at room temperature. It was found that the relaxation oscillation frequency depends on the occupation of the terminal level and thus is directly related to the absorption cross section. Using this method, we show that laser transitions at λ > 1555 nm become four-level at T = 77 K.
© 1994 Optical Society of America
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