Abstract
The double-resonance optogalvanic effect (OGE) of neon in a commercial hollow cathode lamp is used as a sensitive photon detector. The signal photons, emulated by a highly attenuated laser, served as the first step of the two-step, sequential excitation, while a high intensity laser saturated the second, connected transition. The limiting experimental noise was found to be the shot noise on the lamp operating current. The detector exhibited a high quantum efficiency (> 1) over approximately 5 orders of magnitude of energy. The minimum detectable peak energy was 1.3× 10 −15 J (4.2 × 10 3 photons at 640.225 nm).
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