Control of two-photon absorption by using electromagnetic field in sodium and rubidium vapors

Dong Wang; Jinyue Gao; Jihua Xu; Giuseppe C. La Rocca; F. Bassani

doi:10.1117/12.448258

13 November 2001 Control of two-photon absorption by using electromagnetic field in sodium and rubidium vapors

Dong Wang, Jinyue Gao, Jihua Xu, Giuseppe C. La Rocca, F. Bassani

Proceedings Volume 4458, Solar and Switching Materials; (2001) https://doi.org/10.1117/12.448258
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

We applied a pumping field to couple the middle level of two- photon absorption with the fourth level. Two-photon absorption minimum was observed. This is the first observation and experimental analysis of such phenomenon after it was predicted four years ago. In sodium vapor, two-photon absorption strength of 3S_1/2(Fequals2)-3P_3/2-4D_3/2 was measured by detecting the fluorescence at 568.3 nm (4D_3/2-3P_1/2). Levels 3P_3/2 and 5S_1/2 were connected by pumping field. Experimental data of two-photon absorption strength vs detuning from middle level (TADM) shows that the two-photon absorption was reduced by 60% at line center in the presence of resonant pumping field. In rubidium vapor, two-photon absorption of 5S_1/2(Fequals3)-5P_3/2-8S_1/2(Fequals3) was measured by detecting the fluorescence at 607 nm (8S_1/2-5P_1/2). Levels 5P_3/2 and 5D_5/2(Fequals5) were connected by pumping field. The TADM profiles under different experimental condition indicate that the maximum reduction of two-photon absorption can be 80%. And the reduction effect reduced with lower strength, higher detuning frequency and wider line width of pumping field. At the same time, the position of minimum absorption depends on the detuning of pumping field. All the experimental profiles were fitted well with theoretical calculation results.

Citation Download Citation

Dong Wang, Jinyue Gao, Jihua Xu, Giuseppe C. La Rocca, and F. Bassani "Control of two-photon absorption by using electromagnetic field in sodium and rubidium vapors", Proc. SPIE 4458, Solar and Switching Materials, (13 November 2001); https://doi.org/10.1117/12.448258

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