Terahertz lasing in a quantum cascade structure in pulsed mode up to a temperature of 87K at a wavelength of λ=88 µm (3.4 THz) has been obtained. At 5K, a peak power of approximately 3.4 mW is observed, with still ∼1 mW at 78K.
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Williams et al. (2003) studied this question.
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