Efficient electrodeless discharge spectral lamps have been developed that are suitable for transmission monitoring of optically polarized quantum systems. The lamps have a surface brightness close to the theoretical limit with substantially no self‐reversal. The limiting intensity fluctuations observed appear to be that of photon shot noise. Predicted life of the lamp is in excess of 5000 hr.

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Coherence effects which may occur in a narrow, intense spectral emission are assumed to be negligible.
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