The effect of the back reflections in an optical discriminator of a double-mode laser

Phase Tuning Characteristics of a Double-Longitudinal-Mode He-Ne Laser with Optical Feedback

“…[9] In previous research, large studies have been carried out on the frequency and intensity behavior of double-longitudinal-mode He-Ne lasers with optical feedback. [10−12] Vlasov and Budzyn [10,11] presented that the significant degradation of the lasing parameters of frequency-stabilized lasers results from even small-value back reflections, which may possibly lead to a shift or deviation of the optical frequency. We investigated the intensity tuning characteristics of the double longitudinal modes of the He-Ne laser subjected to optical feedback, in which the intensities of the two longitudinal modes are both modulated by the length of the internal cavity.…”