Abstract
ABSTRACT A three-level solid-state maser using ruby has been operated at frequencies near 3000 Mc/s, using a high-efficiency cavity having TEM modes in a rectangular geometry. Two different operating points in the θ = 10° to θ =30 ° region of the ruby spectrum gave maser operation with a pump frequency near 10 500 Mc/s, although the inversion obtained was a. sensitive function of the exact operating point. An operating point at θ = 90°, requiring pumping at 13 500 Mc/s, gave a gain-bandwidth product of better than 50 Mc/s. It was also found possible to pump the 1-4 or ΔM = 3 transition at this same operating point, obtaining 3000 Mc/s amplification with a 23 700 Mc/s pump frequency. Although this mode of operation was not fully explored, it is potentially capable of increasing the gain-bandwidth product by a substantial amount.
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