Coherent light generators – Particular beam control device – Producing plural wavelength output
Patent
1982-04-23
1984-05-22
Davie, James W.
Coherent light generators
Particular beam control device
Producing plural wavelength output
372 27, 372106, H01S 310
Patent
active
044505639
ABSTRACT:
A rapidly tunable laser system which is operative to tune the laser beam emission to a predetermined wavelength in accordance with the polarization state thereof is disclosed. The laser beam emission may be tuned between predetermined wavelengths as rapidly as it can be altered between polarization states. More specifically, the laser system includes a polarization modulator for modulating the radiation beam emitted from a laser cell between at least two polarization states, and at least two diffraction gratings which are uniquely and fixedly aligned to specularly reflect and retroreflect radiation incident thereupon. The retroreflected radiation is of a wavelength uniquely identified with the angle of incidence of the corresponding diffraction grating. One diffraction grating retroreflects radiation at one wavelength and response to one polarization state of the radiation beam, and the other diffraction grating retroreflects radiation at another wavelength in response to radiation at another polarization state. Hence, the laser system may be tuned between the one and another wavelengths by modulating the radiation beam between the one and another polarization states by the polarization modulator. The laser beam emission may be tuned between the predetermined wavelengths as rapidly as it can be altered between the polarization states.
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Davie James W.
Westinghouse Electric Corp.
Zitelli W. E.
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