1When this work was done all authors were with U.S. Air Force Weapons Laboratory (AFSC), Advanced Laser Division, Kirtland Air Force Base, New Mexico 87117-6008
2K. M. Swift is now with DFVLR, Institute for Technical Physics, D-700 Stuttgart 80, Federal Republic of Germany.
A cw atomic iodine photolytic laser at 1.315 μm was used for the first time to measure the refractivities (polarizabilities or Gladstone-Dale constants) of He, H2O, N2, O2, Ar, CO2, O3, Cl2, SF6, ICl, CF3I, I2, and n-C3F7I. For comparison with previous measurements, the refractivities were also obtained at 4579, 4880, 5145, and 6328 Å. Excellent agreement at these wavelengths supports the validity of these newly reported results. The data presented are useful in the development of a near-diffraction-limited laser beam for any atomic iodine laser at 1.315 μm.
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Absorption of the laser radiation at this particular wavelength by I2 prevented any interferometric measurements. Note: The right-hand column cites the maximum uncertainty in the polarizability data reported here.
Maximum acceptable Δρ/ρ0 variations for different iodine laser devices to produce <1/100 wave phase shift for a 1-m path length atomic iodine lasing medium at λ = 1.315 λm. A gas temperature of 23°C is assumed in the calculation. For the iodine laser devices, Hi-P refers to high pressure (>1 atm) of gases existing within the gain region while Low-P refers to low pressures (<100 Torr). All the pressures are given in Torr. Polarizabilities α are expressed in units of 10−24 cm3/particle and β in units of 10−4. The mass (Meff) computed using the relative pressures of each gas is given in atomic mass units (amu) and the densities (ρ0 and ρs) in units of 10−3 g/cm3. The last column labeled Ref. refers to articles describing this laser’s operation.
Tables (2)
Table I
Polarizability (10−24 cm3/molecule) and Gladstone-Dale Constants β (in Parentheses, 10−4) for Various Gases at Several Wavelengths
Absorption of the laser radiation at this particular wavelength by I2 prevented any interferometric measurements. Note: The right-hand column cites the maximum uncertainty in the polarizability data reported here.
Maximum acceptable Δρ/ρ0 variations for different iodine laser devices to produce <1/100 wave phase shift for a 1-m path length atomic iodine lasing medium at λ = 1.315 λm. A gas temperature of 23°C is assumed in the calculation. For the iodine laser devices, Hi-P refers to high pressure (>1 atm) of gases existing within the gain region while Low-P refers to low pressures (<100 Torr). All the pressures are given in Torr. Polarizabilities α are expressed in units of 10−24 cm3/particle and β in units of 10−4. The mass (Meff) computed using the relative pressures of each gas is given in atomic mass units (amu) and the densities (ρ0 and ρs) in units of 10−3 g/cm3. The last column labeled Ref. refers to articles describing this laser’s operation.