1. J.L. Hall: Private communications to J.H. on his original experiments with J.J. Snyder and experience with noise reduction systems. Such a system on a cw dye laser achieved >60 dB suppression from de to 10 kHz, >40 dB from 10 kHz to 100 kHz and >10 dB from 100 kHz to 1 MHz
2. Coherent Associates: Manual on Model 307, ?Noise Eater?
3. J. Hough, S. Hoggan, G.A. Kerr, J.B. Mangan, B.J. Meers, G.P. Newton, N.A. Robertson, H. Ward, R.W.P. Drever:Lecture Notes Phys. 212, 204?212 (Springer, Berlin, Heidelberg 1984)
4. A. Yariv:Quantum Electronics, 2nd ed. (Wiley, New York 1975) Chap. 14
5. J.L. Hall, H.P. Layer, R.D. Deslattes: IEEE/OSA Conf. on Laser Engineering and Applications. Digest of Papers [IEEE Cat. No. 77 CH-1207.0] p. 45 (1977)