Chemically pumped O2(a-X) laser

Endo, Masamori; Kodama, K.; Handa, Y.; Uchiyama, Taro

doi:10.1007/bf00325243

Cited by 4 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The determination of the quenching rate constants of the O 2 metastable electronic state has received considerable attention because of the fact that the atmospheric oxygen A-band, O 2 is responsible for one of the most intense airglows in the terrestrial atmosphere . This electronic state of oxygen also plays an important role in the energy-pooling processes that occur in the oxygen−iodine chemical laser. − Although accurate measurements of these rate constants have been made for major atmospheric constituents, only sketchy results are available for the rare gases He, Ne, Ar, Kr, and Xe. , These rate constants are quite small, and their accurate determination are hindered by the fact that the natural lifetime of this metastable state is so long (∼12 s) and that water vapor and molecular hydrogen, ubiquitous contaminants of gas samples, are such efficient quenchers …”

Section: Introductionmentioning

confidence: 99%

Rare Gas Quenching of Metastable O₂ at 295 K

Kebabian

Freedman

1997

J. Phys. Chem. A

View full text Add to dashboard Cite

The rare gas quenching rate constants of the metastable species, O2 was measured using an induced fluorescence technique that utilizes an incoherent broadband light source and an integrating sphere to maximize excitation efficiency and fluorescence light collection. The measured rate constants at 295 K were the following (in units of 10-20 cm3 molecule-1 s-1): He, 430 ± 13; Ne, 26 ± 5; Ar, 9 ± 5; Kr, 32 ± 3; Xe, 67 ± 5. These values are of much lower magnitude than previous results indicate. However, except for that of helium, these rate constants should be regarded as upper limits, given that water vapor and hydrogen (both highly efficient quenchers) are ubiquitous contaminants of gas samples. The quenching rate constant with ground-state oxygen derived from these experiments, (4.25 ± 0.52) × 10-17 cm3 molecule s-1, is in excellent agreement with previous results.

show abstract

Section: Introductionmentioning

confidence: 99%

Rare Gas Quenching of Metastable O₂ at 295 K

Kebabian

Freedman

1997

J. Phys. Chem. A

View full text Add to dashboard Cite

show abstract

Theoretical study of a new energy extraction scheme of a chemically pumped pulsed iodine laser amplifier

et al. 1993

View full text Add to dashboard Cite

Proposal of a defense application for a chemical oxygen laser

Takehisa¹

2015

SPIE Proceedings

View full text Add to dashboard Cite

Defense application for a chemical oxygen laser (COL) is explained. Although a COL has not yet been successful in lasing, the oscillator was estimated to produce a giant pulse with the full width at half maximum (FWHM) of ~0.05ms which makes the damage threshold for the mirrors several-order higher than that for a typical solid-state laser with a ~10ns pulse width. Therefore it has a potential to produce MJ class output considering the simple scalability of being a chemical laser. Since within 0.05ms a supersonic aircraft can move only a few centimeters which is roughly equal to the spot size of the focused beam at ~10km away using a large-diameter focusing mirror, a COL has a potential to make a damage to an enemy aircraft by a single shot without beam tracking. But since the extracted beam can propagate up to a few kilometers due to the absorption in the air, it may be suitable to use in space. While a chemical oxygen-iodine laser (COIL) can give a pulsed output with a width of ~2 ms using a high-pressure singlet oxygen generator (SOG). Therefore a pulsed COIL may also not require beam tracking if a target aircraft is approaching. Another advantage for these pulsed high-energy lasers (HELs) is that, in case of propagating in cloud or fog, much less energy is required for a laser for aerosol vaporization (LAV) than that of a LAV for a CW HEL. Considerations to use a COL as a directed energy weapon (DEW) in a point defense system are shown.

show abstract

Chemically pumped O2(a-X) laser

Cited by 4 publications

References 16 publications

Rare Gas Quenching of Metastable O₂ at 295 K

Rare Gas Quenching of Metastable O₂ at 295 K

Theoretical study of a new energy extraction scheme of a chemically pumped pulsed iodine laser amplifier

Proposal of a defense application for a chemical oxygen laser

Contact Info

Product

Resources

About

Chemically pumped O2(a-X) laser

Cited by 4 publications

References 16 publications

Rare Gas Quenching of Metastable O2 at 295 K

Rare Gas Quenching of Metastable O2 at 295 K

Theoretical study of a new energy extraction scheme of a chemically pumped pulsed iodine laser amplifier

Proposal of a defense application for a chemical oxygen laser

Contact Info

Product

Resources

About

Rare Gas Quenching of Metastable O₂ at 295 K

Rare Gas Quenching of Metastable O₂ at 295 K