The Interhalogens IF and ICI as Visible Oscillators or Amplifiers

J. G. Eden, Michael L. Dlabal, Sheldon B. Hutchison

Research output: Contribution to journalArticlepeer-review


The spectroscopic and kinetic properties of the interhalogens are reviewed, with emphasis on iodine-monofluoride (IF) and iodine-monochloride (ICI). The IF discharge laser has produced 140 kW, 30 ns FWHM pulses at 491 and 485 nm, and shows promise of being scalable to at least the tens of millijoules per pulse level. The optical gain and transient absorption spectra for the IF 490 nm and ICI 430 nm bands have also been studied for discharge excitation. Gain in excess of 1.0 percent · cm-1 was observed across the entire IF blue-green band (479–498 nm) which demonstrates the potential broad tunability of this molecular laser. For both IF and ICI, strong absorption in the vicinity of the wavelength of maximum gain was identified as being due to the He (2p1P1) excited species. Introduction of Ne or Ar to the gas mixture was found to reduce the He (1P1) density by up to 75 percent, thereby substantially improving the IF small-signal gain-to-absorption ratio as well as the temporal width of the gain pulse. Although ICI has not yet lased, its peak small-signal gain of 1.3 percent · cm-1 and the negligible background absorption measured at λ = 431.3 nm in discharge plasmas make it an attractive candidate for a violet amplifier. The radiative lifetimes for the IF and ICI D’ states have also been measured and are consistent with the known lifetime of the I2 (D’ → A’) transition. Finally, the formation kinetics of IF* and ICI* in electron beam or discharge produced plasmas and the potential and limitations of these molecules as visible lasers (or amplifiers) are discussed.

Original languageEnglish (US)
Pages (from-to)1085-1100
Number of pages16
JournalIEEE Journal of Quantum Electronics
Issue number6
StatePublished - Jun 1981

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


Dive into the research topics of 'The Interhalogens IF and ICI as Visible Oscillators or Amplifiers'. Together they form a unique fingerprint.

Cite this