Coherent Population Trapping οn the Second Resonance Line of Potassium

S. Gozzinia, S. Cartalevab, T. Karaulanovb, A. Lucchesinia and D. Slavovb a IPCF-CNR, Area della Ricerca, via Moruzzi 1, 56124 Pisa, Italy b Institute of Electronics, BAS, boul. Tzarigradsko shosse 72, 1784 Sofia, Bulgaria

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We present the observation of coherent population trapping resonances on the second resonance line of potassium: 4s2S1/2 → 5p2P3/2 with wavelength of 404.4 nm. Moreover, a transfer of the coherent population trapping resonance occurs to the excited 4p2P1/2 and 4p2P3/2 states of the first resonance line due to cascade transitions. This transfer is evidenced by the observation of narrow resonances at the infrared 4s2S1/2 → 4p2P1/2 and 4s2S1/2 → 4 p2P3/2 transitions when alkali excitation is performed at the 404.4 nm violet line.

DOI: 10.12693/APhysPolA.116.492 PACS numbers: 42.50.Gy