AN OPTICAL PUMPING SCHEME FOR EUV LASERS IN TWO COUPLED MEDIA USING A QUASI-CONTINUUM EMITTED BY RARE-EARTH ELEMENTS

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Abstract
The present work proposes the use of narrrow bands of quasi-continuum radiation emitted by rare earth elements in the 60 - 100 Å range, in order to optically pump charged ions obtained separately in a coupled medium. The lasing transitions would be in the XUV range (λ > 300 Å). The proposed pumping medium is a low-inductance high-current vacuum spark. Ions of the elements Lanthanum to Dysprosium having an open 4dk sub-shell, emit a very large number of lines belonging to the 4p64dk - 4p54dk+1 and 4dk-4dk-14f transitions, within a 2 to 4 Å width band. Relatively low ionization states of low Z elements in the lasing medium are produced by means of an embedded exploding wire (EEW). The EEW source will enable to obtain plasmas having a wide range of densities and relatively low temperatures - thus minimizing both collisional transfer processes and Doppler broadening of the lines of interest. A scheme, using a Cerium band centered at 89Å to pump the 2p54p levels of SiV is proposed. The lasing 4p → 3s transitions will be emitted in the 300 - 400 Å region

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