Lasing Mechanism of the Discharge-Pumped KrF Laser and Experimental Relations between Output Powers and Gas Concentrations

Using a home-made Blumlein-type laser apparatus provided with a simple preionization device, output powers of the 248 nm KrF laser were measured for various mixture of F2/ Kr/He at several total pressures ranging from 500 Torr to 2.65 atm. From the detailed investigation of the relation between the laser power and the mixing ratios of F2/Kr/He, three rules are deduced. To give theoretical basis for these rules computer simulation are carried out for a mixture experimentally found optimal at 2.65 atm. Fourty-four processes were taken into account, and eleven simultaneous differential equations are solved numeri cally. By varying nine parameters the observed laser pulse shape and delay time are well reproduced. Independent simulations for several different mixtures at a total pressure in the range 2.45•`2.87 atm reproduced the three rules. Temporal behaviours of the electron temperature, concentrations of the electron and transient species, and the laser gain are analysed, and a reasonable lasing mechanism is deduced.

[1]  F. W. Lee,et al.  Measurement of the rate coefficients for the bimolecular and termolecular de‐excitation reactions of He(2 3S) with selected atomic and molecular species , 1979 .

[2]  C. Brau,et al.  Theoretical studies of UV-preionized transverse discharge KrF and ArF lasers , 1978 .

[3]  R. Sze,et al.  Experimental studies of a KrF and ArF discharge laser , 1978 .

[4]  R. Waynant,et al.  KrF(B) quenching by He, Ne, Xe, and NF3 , 1978 .

[5]  C. Brau,et al.  Dissociative attachment of electrons to F2 , 1978 .

[6]  M. Flannery,et al.  Ionic recombination of Kr+ and Kr+2 with F− in dense buffer rare gases , 1978 .

[7]  M. Rokni,et al.  Rare gas fluoride lasers , 1978 .

[8]  S. Karasawa,et al.  Absorption bands and lines in the KrF laser spectrum , 1978 .

[9]  R. Waynant,et al.  New quenching rates applicable to the KrF laser , 1978 .

[10]  G. Quigley,et al.  The radiative lifetime and quenching of KrF , 1978 .

[11]  F. W. Lee,et al.  Pressure dependence of the reaction of He2(3Σ) metastable molecules with Ar , 1978 .

[12]  M. Flannery,et al.  Ionic recombination of rare‐gas molecular ions X+2 with F− in a dense gas X , 1978 .

[13]  S. Karasawa,et al.  Spectroscopic Study of a Discharge-Pumped XeF Laser at High Resolution , 1978 .

[14]  A. Alcock,et al.  Parametric study of a constant E/N pumped high-power KrF* laser , 1978 .

[15]  M. Flannery,et al.  Ionic recombination of rare‐gas atomic ions X+ with F− in a dense‐gas X , 1978 .

[16]  R. J. Hall.  Dissociative attachment and vibrational excitation of F2 by slow electrons , 1978 .

[17]  W. Lacina,et al.  Theoretical analysis of the electrically excited KrF laser , 1978 .

[18]  M. Rokni,et al.  Formation and quenching processes in e–beam‐pumped Kr/F2 mixtures , 1978 .

[19]  W. R. Wadt,et al.  Theoretical absorption spectra for Ne2/+/, Ar2/+/, Kr2/+/, and Xe2/+/ in the near ultraviolet , 1977 .

[20]  K. J. McCann,et al.  Photoionization of metastable rare‐gas atoms (He*,Ne*,Ar*,Kr*,Xe*) , 1977 .

[21]  A. J. Cunningham,et al.  Quenching reactions of He(2 3S) and He2(2 3Σ) metastables in the presence of N2 and O2 , 1977 .

[22]  D. Rothe,et al.  Analysis of a spark-preionized large-volume XeF and KrF discharge laser , 1977 .

[23]  A. Hawryluk,et al.  Three‐body quenching of KrF* by Ar and broad‐band emission at 415 nm , 1977 .

[24]  D. Trainor,et al.  Dissociative attachment of electrons to F2 , 1977 .

[25]  V. N. Ishchenko,et al.  Superradiative rare gas halide lasers excited by electric discharge , 1977 .

[26]  G. Tisone,et al.  Spectroscopic studies of diatomic noble gas halides. II. Analysis of bound-free emission from XeBr, XeI, and KrF , 1976 .

[27]  N. Djeu,et al.  Ultraviolet‐preionized discharge‐pumped lasers in XeF, KrF, and ArF , 1976 .

[28]  J. Velazco,et al.  Quenching rate constants for metastable argon, krypton, and xenon atoms by fluorine containing molecules and branching ratios for XeF* and KrF* formation , 1976 .

[29]  C. Tracy,et al.  Properties of metastable krypton atoms in afterglows produced in krypton and krypton–nitrogen mixtures , 1976 .

[30]  P. Hay,et al.  Electronic states of KrF , 1976 .

[31]  P. Monchicourt,et al.  High-pressure helium afterglow at room temperature , 1976 .

[32]  C. P. Wang,et al.  Fast-discharge-initiated KrF laser , 1975 .

[33]  J. J. Ewing,et al.  Laser action on the 2Σ+1/2→2Σ+1/2 bands of KrF and XeCl , 1975 .

[34]  J. J. Ewing,et al.  Emission spectrum of XeI in electron-beam-excited Xe/I 2 mixtures , 1975 .

[35]  J. Velazco,et al.  Bound–free emission spectra of diatomic xenon halides , 1975 .

[36]  T. Ishihara,et al.  Study of the photodetachment of C- and F- by many-body perturbation theory , 1974 .

[37]  David Smith,et al.  Three body conversion reactions in pure rare gases , 1972 .

[38]  J. A. Herce,et al.  Formation and Collisional Dissociation of Heteronuclear Rare‐Gas Associative Ions , 1972 .

[39]  R. E. Roberts,et al.  Ion-atom association reactions in the rare gases , 1972 .

[40]  A. Mandl.  Electron Photodetachment Cross Section of the Negative Ion of Fluorine , 1971 .

[41]  D. Bohme,et al.  Flowing Afterglow Studies of the Reactions of the Rare‐Gas Molecular Ions He2+, Ne2+, and Ar2+ with Molecules and Rare‐Gas Atoms , 1970 .

[42]  R. Vogel,et al.  The Absorption Spectrum of Fluorine1 , 1956 .