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European Quantum Electronics Conference (EQEC)

Collisional excitation of 4p /sup 2/P states of Ca/sup +/ following pulsed-laser pumping of the 4s/sup 2/ /sup 1/S/sub 0/-4s4p /sup 3/P/sub 1/ transition of Ca

Muhammad Arshad Khan, M.A. Gondal, M. H. Rais

Published Aug 24, 2005• 0 citations
Publisher
DOI
10.1109/eqec.1994.698483

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The role of some intermediate states, e.g. 4s5p 3 P, 3d4p( 1 D, 3 F) of Ca I in the collisional excitation of the 4p 2 P 3/2,1/2 states of Ca II (located at 74720.35 and 74497.46 cm -1 above the ground state of Ca I) following pulsed-laser pumping of the 4s4p 3 P 1 state of Ca I (E ex =15210.063 cm -1 ), is investigated. A 'pump' and 'probe' technique is employed together with the study of fluorescent emission. The 'probe' laser selectively prepares a substantially higher population of a specific intermediate state in Ca I and the increase in the fluorescent intensity of the 4p 2 P 3/2 - 4s 2 S 1/2 transition of Ca II is read as the relative strength of the particular collision channel utilizing that intermediate state. It is found that the 3d4p 1 D 2 state has the strongest influence.
We have studied Superfluorescence (SF) under highly unfavorable conditions of rapid collisional and radiative distribution in a Doppler broadened medium. Nanosecond SF pulses at 5.5 {mu} were generated from a 50 cm column of calcium vapor buffered with argon by optically pumping the Ca (4s{sup 2} {sup 1}S{sub 0} - 4s4p{sup 1}P{sub 1} - 3d4s{sup 1}D{sub 2}) Raman Amplifier scheme. Power broadening due to an intense 13 nsec pump pulse precludes the evolution of SF for essentially this duration. As a result, the scaling laws which govern the properties of SF in a transversely excited system are shown to apply in our situation in which the conditions resemble swept excitation.