Volkov O.Y., Duzhikov I.N., Khabibullin R.A., Baranov A.N., Divin Y.Y. Subterahertz difference-frequency generation in terahertz quantum cascade lasers. Applied Physics Letters , 2022 , 121. р. 263504. ISSN 0003-6951
Полный текст не доступен из этого репозитория.Аннотация
We have detected subterahertz spectral lines in the emission of free-running GaAs/AlGaAs quantum cascade lasers (QCLs) operating around 3 THz. We have found that the power W(fd) of an individual sub-THz line at the frequency fd is directly proportional to a power product W(fi) x W(fk) of the corresponding pair of THz lines having the frequency difference fi - fk = fd. The established one-to-one correspondence of each sub-THz line to pair combinations of THz lines proves the nonlinear mechanism of difference-frequency generation (DFG) in the QCL active region. The conversion efficiencies W(fi - fk)/[W(fi) x W(fk)] estimated from the experimental data are about 4x10^-3 and 5x10^-5 W^-1 for the sub-THz lines found at 132 and 310 GHz, correspondingly. Considering nonlinear polarization of QCL active regions as the reason for DFG, we have evaluated the following values of the second-order nonlinear susceptibility v^(2)(132 GHz) = 7x10^5 pm/V and v^(2)(310 GHz) = 4x10^4 pm/V from the experimental data. The obtained results pave the way for the use of THz QCLs as sources of sub-THz radiation.
| Тип объекта: | Статья |
|---|---|
| Авторы на русском. ОБЯЗАТЕЛЬНО ДЛЯ АНГЛОЯЗЫЧНЫХ ПУБЛИКАЦИЙ!: | Волков О.Ю., Дюжиков И.Н., Хабибуллин Р.А., Баранов А.Н., Дивин Ю.Ю. |
| Подразделения (можно выбрать несколько, удерживая Ctrl): | 183 лаб. фотоэлектронных явлений |
| URI: | http://cplire.ru:8080/id/eprint/8293 |
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