Abstract
We have observed a strong anticorrelation between the photocurrent fluctuations of two laser outputs from symmetric low-Q cavity laser diodes (LDs) driven far above the threshold in a constant-current mode. The degree of correlation is highly dependent on the mirror reflectivities of the cavity:nn-66% for the conventional LD with cleaved facets, and -90% for the antireflection-coated LD with residual mirror reflectivities of 5%. In the case of a cleaved LD, the sum of the photocurrent fluctuations of both laser outputs exhibits 2.8 dB noise reduction below the shot-noise level. This is the first observation of subshot-noise photocurrent fluctuations symmetric cavity LDs.
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