## Abstract

This paper describes the results of a detailed experimental study of an electron-beam-pumped, high Kr concentration KrF laser. The excitation rate is 1.4 MW/cm^{3} for 1 atm of Kr gas. The formation efficiency of KrF* and extraction efficiency are estimated using calculated values of saturation intensity and g_{0}/α_{0}, the ratio of small-signal gain to saturable absorption, together with measured values of g_{0} and the ratio of g_{0} to nonsaturable absorption (α_{n}). Although the highest formation efficiency of 24% is observed at 99.7% Kr concentration, the effect of finite vibrational-relaxation rate significantly decreases the KrF* density accessible to lasing at high Kr concentration due to the shorter lifetime of KrF*. KrF* vibrational-relaxation rates of 4×10^{-11} and 5×10^{-11} cm^{3} s ^{-1} are determined for Ar gas and Kr gas, respectively. A decrease of g_{0}/α_{0} and g_{0}/α _{n} resulting in low extraction efficiency is observed at high Kr concentration due to the relatively high α_{0} and α_{n}. The intrinsic efficiencies are 11, 11.8, and 9% for 1 atm mixtures at 10, 50, and 99.7% Kr, respectively.

Original language | English |
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Pages (from-to) | 476-488 |

Number of pages | 13 |

Journal | Journal of Applied Physics |

Volume | 61 |

Issue number | 2 |

DOIs | |

Publication status | Published - 1987 |

Externally published | Yes |

## ASJC Scopus subject areas

- Physics and Astronomy(all)