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Physical Review Letters

Fluorescence Excitation by the Absorption of Two Consecutive Photons

John F. Porter

Published Dec 1, 1961• 65 citations
Publisher

Abstract

Fluorescence radiation from polycrystalline La: PrCl/sub 3/ was observed using two separate excitation sources. This fluorescence cannot be attributed to either source alone. The scheme is similar to N. Blocmbergen's proposal for a solid-state infrared quantum counter (Phys. Rev. Letters Porter, Jr., J. Appl. Phys. 32, 825(1961)). (L.N.N.)

DOI
10.1103/physrevlett.7.414

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Fluorescence radiation from polycrystalline La: PrCl/sub 3/ was observed using two separate excitation sources. This fluorescence cannot be attributed to either source alone. The scheme is similar to N. Blocmbergen's proposal for a solid-state infrared quantum counter (Phys. Rev. Letters Porter, Jr., J. Appl. Phys. 32, 825(1961)). (L.N.N.)
A survey of the salts of the rare-earth series shows that anhydrous PrCl3 has energy levels and selection rules suitable for use in a solid state infrared quantum counter as proposed by Bloembergen [N. Bloembergen, Phys. Rev. Letters 2, 84 (1959)]. Two suitable schemes are proposed, one for detection at 2.33 μ and a second for detection at 104 μ. Consideration is given to isolation of the final detector from the pumping signal and a suitable experimental arrangement for unambiguously determining proper operation is shown.
One photon was known to be able to excite two Pr/sup 3+/ ions to different levels, one of which was always /sup 3/Po as detected by fluorescence. Using crystals of pure PrCl/sub 3/, 90 absorption lines corresponding to ion pair absorption were detected in the region between 22, 220, and 28,100 cm/sup -1/. Classifications and wave numbers of the lines are given. The lines show no polarization, and most of their frequencies can be written as the sum of two ordinary absorption frequencies. The width of the lines is about 6 cm/sup -1/. (D.C.W.)
A fluorescence radiation inhibition has been observed by absorption of a laser beam at a resonance of 852 nm at the interface of a Pyrex cell containing optically thick Cesium vapor. One observes a hole of GHz magnitude at the center of the retro-fluorescence signal associated with the lines of hyperfine structure 62P312-625112 (F =4,3). This phenomenon of inhibition, similar to a self-reversal of spectral lines, is found in the radiation generated by pooling effect. It occurs without a significant change in the absorption rate of laser energy. This is attributed to a coupling between atoms excited to 62P312 by laser pumping and a deposit of Cesium of atomic dimensions on the glass. At resonance, an important proportion of the atoms excited by the laser is in the vicinity of a thin conducting film. The non-radiating transformation process of the atomically excited energy to thermal energy is therefore favored. The interface lit by a monochromatic laser diode acts as a stop band filter and as a secondary luminous source. The width of the filter at half-height is proportional to the density of the atomic vapor. Sub-Doppler effects in inhibition spectral band have been observed. We present new experimental results and a phenomenon-related study of fluorescence inhibition induced by interfaced laser.