Abstract

We study the spin polarization of Doppler-broadened atoms by broadband nanosecond (ns) pulses, and compare the polarization efficiency with that by the transform-limited picosecond (ps) pulses that have the same spectral bandwidth. Specific calculations are performed for the case of muonium with a set of density matrix equations and with rate equations using the uncoupled basis states. We find that the polarization efficiency with the broadband ns laser pulses is rather good, although it is not as good as that with the transform-limited ps pulses. Our results imply that, depending on the available laser system, we can use either broadband ns or transform-limited ps laser pulses to polarize almost any Doppler-broadened atoms.

© 2012 Optical Society of America

Ionization efficiency of Doppler-broadened atoms by transform-limited and broadband nanosecond pulses: one-photon resonant two-photon ionization of muoniums

Rakesh Mohan Das, Souvik Chatterjee, Masahiko Iwasaki, and Takashi Nakajima
J. Opt. Soc. Am. B 32(6) 1237-1244 (2015)

Nuclear-spin polarization of atoms by chirped laser pulses: application to the muonium

Rakesh Mohan Das, Katsuhiko Ishida, Masahiko Iwasaki, and Takashi Nakajima
J. Opt. Soc. Am. B 35(8) 1799-1810 (2018)

A scheme to polarize nuclear-spin of atoms by a sequence of short laser pulses: application to the muonium

Takashi Nakajima
Opt. Express 18(26) 27468-27480 (2010)

Recursion-relation analysis for optical pumping to polarize nuclei by a sequence of short laser pulses

Takashi Nakajima
J. Opt. Soc. Am. B 28(9) 2123-2128 (2011)

Generation of vacuum-ultraviolet pulses with a Doppler-broadened gas utilizing high atomic coherence

Li Deng and Takashi Nakajima
Opt. Express 20(16) 17566-17580 (2012)