Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1987-05-26
1988-08-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356352, 372 12, 350385, G01J 132, G01B 902
Patent
active
047629886
ABSTRACT:
A circuit arrangement including a controllable optical resonator having a filter characteristic with a transmission peak arranged to pass laser radiation at a wavelength in the region of the transmission peak, wherein the resonator is positioned to receive the laser radiation at an angle such that two modes of the radiation, having respectively different polarization states, and wavelengths, are capable of propagating in the resonator. The resonator has control electrodes connected for receiving a voltage which determines the wavelength of the transmission peak of the filter characteristic and a source connected for applying to the electrodes a square-wave modulating voltage which varies between a first value which causes the transmission peak of the resonator to be substantially at the wavelength of one of the modes and a second value which causes the transmission peak of the resonator to be substantially at the wavelength of the other one of the modes. A device is optically coupled to the resonator for deriving two electrical signals each corresponding to radiation passing through the resonator in a respective one of the two modes. A device is connected for determining the phase difference between the two electrical signals and a device is connected for acting on the resonator in a manner to reduce the phase difference to zero on the basis of at least one of the electrical signals.
REFERENCES:
patent: 3609381 (1971-09-01), Hartfield
patent: 3612655 (1971-10-01), Buchan et al.
patent: 3628173 (1971-12-01), Danielmeyer
patent: 4094581 (1978-06-01), Baldwin et al.
patent: 4233569 (1980-11-01), Liu
patent: 4508964 (1985-04-01), Gunning, III et al.
patent: 4558952 (1985-12-01), Kulesh et al.
patent: 4632552 (1986-12-01), Olsson et al.
patent: 4672618 (1987-06-01), Wijntjes et al.
Messinger Michael
Nelms David C.
Standard Elektrik Lorenz AG
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