Parametric studies of an electron-beam-pumped krypton-rich KrF laser

Journal Article · Thu Jan 15 04:00:00 EST 1987 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.338247· OSTI ID:6868138

Kannari, F; Shaw, M J; O'Neill, F

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/sup 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/sub 0//..cap alpha../sub 0/, the ratio of small-signal gain to saturable absorption, together with measured values of g/sub 0/ and the ratio of g/sub 0/ to nonsaturable absorption (..cap alpha../sub 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 x 10/sup -11/ and 5 x 10/sup -11/ cm/sup 3/ s/sup -1/ are determined for Ar gas and Kr gas, respectively. A decrease of g/sub 0//..cap alpha../sub 0/ and g/sub 0//..cap alpha../sub n/ resulting in low extraction efficiency is observed at high Kr concentration due to the relatively high ..cap alpha../sub 0/ and ..cap alpha../sub n/. The intrinsic efficiencies are 11, 11.8, and 9% for 1 atm mixtures at 10, 50, and 99.7% Kr, respectively.

• Research Organization: Laser Division, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 OQX, United Kingdom
• OSTI ID: 6868138
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 61:2; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CHEMICAL REACTION KINETICS
DATA
EFFICIENCY
ELECTRICAL PUMPING
ELECTRON BEAM PUMPING
ENERGY-LEVEL TRANSITIONS
EXCIMER LASERS
EXCITATION
EXPERIMENTAL DATA
FABRICATION
FLUORIDES
FLUORINE COMPOUNDS
GAS LASERS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
KINETICS
KRYPTON COMPOUNDS
KRYPTON FLUORIDE LASERS
KRYPTON FLUORIDES
LASERS
NUMERICAL DATA
OPERATION
PUMPING
RARE GAS COMPOUNDS
REACTION KINETICS