The power-versus-wavelength characteristic for a high-power, continuously tunable far-infrared source has been experimentally determined and compared with theory. Utilizing a Q-switched ruby laser as the pump and stimulated polariton scattering in the crystal LiNbO3 as the scattering mechanism, peak powers outside the crystal of ∼ 3 W at 200 μ are observed without crystal damage. Linewidth measurements indicate a bandwidth of < 0.5 cm−1 for the radiation over the observed tuning range 66–200 μ.
Millimeter-wave power is generated from an n+/p Hg0.74Cd0.26Te photovoltaic diode illuminated by two CO lasers of 5.467- and 5.478-μm wavelengths, respectively. The output frequency is determined by the laser line separation to be 110 GHz. A maximum power of 0.75 μW is observed when the diode is dc biased at 0.5 V in the reverse direction.
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