Amplified spontaneous emission in the 1035 AA doublet of O5+

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Abstract
A new suggestion is made for a single-pass, high-gain, O5+ ion laboratory laser at 1035 AA. A large population inversion is shown to be generated when an X-ray pulse K shell ionises O3+ ions, followed by Auger ionisation to an excited state of O5+. Using a strong, pulsed X-ray source which is within present capabilities, a gain coefficient of the order of 1 cm-1 can be produced in a pure oxygen plasma in coronal ionisation equilibrium at 105K and at a density of the order of 1015 cm-3. Constraints and requirements for the achievement of high gain are analysed. These are shown to allow a maximum number of unsaturated gain lengths ranging from several tens to several hundreds, depending upon the size and geometry of the laser configuration.