Pressure Broadening Of The Atomic Iodine 5[sup]2[/sup]P[sub]1/2[/sub] - 5[sup]2[/sup]P[sub]3/2[/sub] Transition

D. Cerny; M. Aubert-Frecon; R. Bacis; B. Bussery; M. Nota; J. Verges

doi:10.1117/12.950538

20 June 1989 Pressure Broadening Of The Atomic Iodine 5²P_1/2 - 5²P_3/2 Transition

D. Cerny, M. Aubert-Frecon, R. Bacis, B. Bussery, M. Nota, J. Verges

Proceedings Volume 1031, 7th Intl Symp on Gas Flow and Chemical Lasers; (1989) https://doi.org/10.1117/12.950538
Event: 7th International Symposium on Gas Flow and Chemical Lasers, 1988, Vienna, Austria

Abstract

The pressure broadening coefficients of the atomic iodine 52P112 - 52P312 transition are important parameters for the modelling of photolytically pumped iodine lasers. Various measurements have been reported in the literature corresponding to a relatively high pressure range (1 atm.) of interest for photolytically pumped iodine lasers (see Ref. I and references therein). Little has been done at low pressure in particular for 02 and I2 broadening. indeed the pressure broadening coefficients (α of 02 and 12 have been measured only in two works2,3 at high temperature. Following the scaling factor used for extrapolation at room temperature, the results lead to (X values which differ by a factor of two. We report here about the Ar, O2 and I2 measurements of optical broadening coefficients α at low pressure that are of interest for the Chemical Oxygen Iodine Laser. As a matter of fact it has been shown that the hyperfine relaxation rates K and K* between the hyperfine levels of I (2P3/2) and I (2P1/2 ) (see Fig.1) are of importance in determining the active laser cavity width and the total laser power extraction.45 The K and K* rates are directly related to the optical broadening coefficient a. As only the order of magnitude of K and K* have been estimated6'7 the determination of the coefficient (X will serve as a check for these estimates of K and K*.

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D. Cerny, M. Aubert-Frecon, R. Bacis, B. Bussery, M. Nota, and J. Verges "Pressure Broadening Of The Atomic Iodine 5²P_1/2 - 5²P_3/2 Transition", Proc. SPIE 1031, 7th Intl Symp on Gas Flow and Chemical Lasers, (20 June 1989); https://doi.org/10.1117/12.950538

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