Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-07-25
1988-03-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
372 31, G01J 132
Patent
active
047301058
ABSTRACT:
An external mirror is positioned relative to the output mirror of a laser to form a Fabry-Perot cavity. The light transmitted by this Fabry-Perot cavity is compared to a reference value in order to develop an error signal which in turn is used to adjust the transmission characteristics of the Fabry-Perot cavity. In the embodiment constructed a beam splitter is positioned to deflect light coupled out of the Fabry-Perot cavity to an optical detector. The output of this detector is compared to a reference voltage in a difference amplifier which generates an electrical error signal. The electrical error signal is coupled to a piezoelectric translator which is attached to the external mirror and is capable of moving that mirror in a way so as to change the transmission characteristics of the Fabry-Perot cavity. Specific embodiments using a dye laser and a soliton laser are also disclosed.
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Kobayashi et al., "Single-Frequency Oscillation Using . . .", Appl. Phys. Let., vol. 16, No. 5, Mar. 1, 1970, pp. 217-218.
Mitschke Fedor M.
Mollenauer Linn F.
American Telephone and Telegraph Company AT&T Bell Laboratories
Dubosky Daniel D.
Nelms David C.
Ranieri Gregory C.
Seo Chung
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