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Physical Review A

Optical pumping by a laser pulse traveling in a cavity

T. Majima, Akira Terasaki, Tamotsu Kondow

Published Mar 24, 2008• 4 citations
Publisher

Abstract

We have developed a general method to perform optical pumping by a pulsed laser with the aid of an optical cavity (cavity-assisted optical pumping). Optical pumping is achieved by repetitive interaction of a single laser pulse with a target material in the cavity. This method is demonstrated for manganese ions, ${\text{Mn}}^{+}$, stored in a linear radio-frequency ion trap; about ${10}^{8}$ ions are spin polarized by a 5-ns laser pulse via ${^{7}P}_{J}\ensuremath{\leftarrow}{^{7}S}_{3}$ ($J=3$ or 4) transition in the ultraviolet region. The linewidth of the pulsed light source is broad enough to transfer the populations of lower hyperfine levels to the highest one $(F=11/2)$ in the ${^{7}S}_{3}$ ground state; the nuclear spin is polarized as well.

DOI
10.1103/physreva.77.033417

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We have developed a general method to perform optical pumping by a pulsed laser with the aid of an optical cavity (cavity-assisted optical pumping). Optical pumping is achieved by repetitive interaction of a single laser pulse with a target material in the cavity. This method is demonstrated for manganese ions, Mn+{\text{Mn}}^{+}Mn+, stored in a linear radio-frequency ion trap; about 108{10}^{8}108 ions are spin polarized by a 5-ns laser pulse via 7PJ\ensuremath←7S3{^{7}P}_{J}\ensuremath{\leftarrow}{^{7}S}_{3}7PJ​\ensuremath←7S3​ (J=3J=3J=3 or 4) transition in the ultraviolet region. The linewidth of the pulsed light source is broad enough to transfer the populations of lower hyperfine levels to the highest one (F=11/2)(F=11/2)(F=11/2) in the 7S3{^{7}S}_{3}7S3​ ground state; the nuclear spin is polarized as well.
A novel experimental technique has been developed to observe a trace of optical absorption of free mass-selected ions. The technique combines a linear radio-frequency ion trap with a high-finesse optical cavity to perform cavity ring-down spectroscopy (photon-trap spectroscopy for generality), where the storage lifetime of photons in the cavity provides a sensitivity high enough to probe the trapped ions. Absorption spectra of the manganese ion Mn(+) are presented, showing hyperfine structures for the (7)P(2,3,4)<--(7)S(3) transitions in the ultraviolet range. Implementation of a solenoidal magnet allows us to observe the Zeeman splitting and the Faraday rotation as well.
A novel experimental method is presented for detection of a trace of optical absorption of mass-selected ions stored in an ion trap. Photon-trap spectroscopy (a generalized scheme of cavity ring-down spectroscopy) is the key technique, where a storage lifetime of photons in a high-Q cavity provides a ppm-level high sensitivity. Experiment was performed on the manganese ion, Mn + , to record 7 P 2,3,4 ← 7 S 3 absorption spectra at around 260 nm. Zeeman splitting and Faraday rotation of the polarization plane were observed as well in the presence of a magnetic field. The high-resolution spectra show complex structures, which are fully interpreted by the quantum theory incorporating hyperfine interaction due to the Mn nuclear spin ( I = 5/2). The present technique provides a novel approach to electronic and magnetic structures of mass-selected atomic, molecular, and cluster ions.
We have demonstrated a pulsed two-photon laser at the transition $3d^{2}D\ensuremath{-}2s^{2}S$ of atomic Li (frequency ${\ensuremath{\omega}}_{31}$) by (i) generation of a coherent light beam at ${\ensuremath{\omega}}_{x}$, stimulated by light pulses at ${\ensuremath{\omega}}_{1}={\ensuremath{\omega}}_{31}\ensuremath{-}{\ensuremath{\omega}}_{x}$, and (ii) single-pass amplification of injected light at ${\ensuremath{\omega}}_{3}=\frac{{\ensuremath{\omega}}_{31}}{2}$.
Abstract. Some of us have recently reported in Science [1] vibrational cooling of translationally cold Cs2 molecules into the lowest vibrational level v = 0 of the singlet X1Σg ground electronic state. Starting from a sample of cold molecules produced in a collection of vibrational levels of the ground state, our method was based on repeated optical pumping by laser light with a spectrum broad enough to excite all populated vibrational levels but frequency-limited in such a way to eliminate transitions from v = 0 level, in which molecules accumulate. In this paper this method is generalized to accumulate molecules into an arbitrary selected ”target ” vibrational level. It is implemented by using ultrashort pulse shaping techniques based on Liquid Crystal spatial light modulator. In particular a large fraction of the initially present molecule is transferred into a selected vibrational level such as v = 1, 2 and 7. Limitations of the method as well as the possible extension to rotational cooling are also discussed. PACS numbers: 06.60.Jn; 32.80.Qk; 33.20.Tp; 37.10.Mn; 42.65.Re; 42.79.Kr 1.