In the cited article the frequency stability of a singlemode He-Ne laser is concluded from the stability of the laser intensity. We point out that this derivation of frequency stability may show remarkable systematic errors.
© 1990 Optical Society of America
Wolfgang Holzapfel, Wolfgang Luxem, and Walter Settgast, "Stabilization of single frequency internal mirror He–Ne lasers: comment," Appl. Opt. 29, 3877-3878 (1990)