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A description is given of an optimal system for parametric conversion of one-photon light into a two-photon field. This system is suitable for absolute calibration of photodetectors throughout the visible range without the use of a standard source for comparison. Tuning curves of such a parametric converter are calculated and verified experimentally. The efficiency achieved in this method of generation of a two-photon field (10 6 of two-photon pairs per second in a spectral band Δ ν = 10 cm −1 wide) makes it possible to calibrate photodetectors to within at least 3–4% after accumulation of a signal for a time of the order of 100 sec.
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Малыгин et al. (1981) studied this question.
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