A system for fast measurement of optical gain in discharges

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Abstract
The measurement of optical gain by means of measuring the amplification of the spontaneous emission is based on a relatively simple principle. A feedback optical system reflects emitted light back into the discharge where it may be amplified or absorbed. A new all-purpose system is described which is independent of the discharge geometry and which determines the gain from simultaneous measurements in two directions of polarisation. Charge-coupled devices (CCDS) are employed as optical detectors. The system records a spectral range of about 20 nm simultaneously. The special features of the CCDS permit the realisation of a fast optical shutter. A microprocessor system is used for controlling the measurement, evaluating the measured data and correcting errors due to the optical set-up.

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