@article{e64c0287452f40a19f4b226cc42b98d7,
title = "Doppler-free two-photon absorption spectroscopy of naphthalene",
abstract = "Doppler-free intracavity two-photon absorption in gas phase naphthalene was demonstrated for the first time. A cw tunable dye laser system was modified to incorporate an intracavity absorption gas cell for this work. A detailed description of the experimental apparatus is given. This technique has many advantages over the conventional pulsed-type set-up, and is applicable to other atomic and molecular systems. The observed linewidths of Doppler-free two-photon rovibronic features of naphthalene S1 ← S0 excitation spectrum are on the order of 300 MHz. The combined effects of the laser width, frequency scanning rates and the high density of states prevented us from resolving individual robrivonic lines.",
author = "Chen, {Kuo mei} and Khoo, {I. C.} and Steenhoek, {Larry E.} and Yeung, {Edward S.}",
note = "Funding Information: The first experimental observations of Doppler-free two-photon absorption (DFTPA) in atomic systems were reported simultaneously by several groups \[1 \]. Current researchers are still concentrating on sodium \[2\]t, hallium \[3\]a nd other typical atomic gases \[4\].D FTPA m atomic systems has been reviewed by Bloembetgen and Levenson \[5\].B lschel et al. \[6\] have reported DFTPA of CH3F and NH 3 in the infra-red spectral region. Woerdman \[7\]h as reported DFTPA in Na 2. Two-photon absorption processes in this system are greatly enhanced by a resonant intermediate state. The only other instance of DFTPA in molecular systems is the work by Galbwachs et al. \[8\] on nitric oxide and benzene, m whmh these authors used a pulsed tunable dye laser and a counter-propagating beam arrangement. The hnewldths observed are hmlted by the laser width. Judging from the reported spectra, the reproducibility of their laser system while scanning over a narrow spectral region IS poor. Furthermore, their benzene spectrum includes significant con-tributlons from Doppler-limited signal. The oscillator strengths of atomic systems are distributed unevently in a few levels and the fluorescence * Research supported by the U.S. Energy Research and De-velopment Administration, Division of Physical Research.",
year = "1977",
month = oct,
doi = "10.1016/0030-4018(77)90133-X",
language = "English (US)",
volume = "23",
pages = "90--94",
journal = "Optics Communications",
issn = "0030-4018",
publisher = "Elsevier",
number = "1",
}