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TASERs: Possible dc pumped terahertz lasers using interwell transitions in semiconductor heterostructures
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7.The ”impedance-admittance” language accepted in this work is equivalent to the usual language of loss-gain balance. While the latter language is more traditional in the literature on lasers, we believe that our formulation is more natural for any system where the thickness d of the active region (but not necessarily the planar size of the device) is much smaller than the radiation wavelength.
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