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Gershenzon EM, Gol'tsman GN, Ptitsina NG. Observation of the free-exciton spectrum at submillimeter wavelengths. JETP Lett. 1972;16(4):161–2.
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Gershenzon EM, Orlov LA, Ptitsina NG. Absorption spectra in electron transitions between excited states of impurities in germanium. JETP Lett. 1975;22(4):95–7.
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Gershenzon EM, Orlova SL, Orlov LA, Ptitsina NG, Rabinovich RI. Intervalley cyclotron-impurity resonance of electrons in n-Ge. JETP Lett. 1976;24(3):125–8.
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Gershenzon EM, Gol'tsman G, Ptitsina NG. Energy spectrum of free excitons in germanium. JETP Lett. 1973;18(3):93.
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Tuchak AN, Gol’tsman GN, Kitaeva GK, Penin AN, Seliverstov SV, Finkel MI, et al. Generation of nanosecond terahertz pulses by the optical rectification method. JETP Lett. 2012;96(2):94–7.
Abstract: The possibility of the generation of quasi-cw terahertz radiation by the optical rectification method for broad-band Fourier unlimited nanosecond laser pulses has been experimentally demonstrated. The broadband radiation of a LiF dye-center laser is used as a pump source of a nonlinear optical oscillator. The energy efficiency of terahertz optical frequency conversion in a periodically polarized lithium niobate crystal is 4 × 10−9 at a pump power density of 7 MW/cm2.
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