Open AccessГенерация частотных гребенок квантово-каскадными лазерами спектрального диапазона 8 μm
Author(s) -
В.В. Дюделев,
Д.А. Михайлов,
А.В. Бабичев,
С.Н. Лосев,
Д.В. Чистяков,
Е.А. Когновицкая,
Д.Д. Авров,
С.О. Слипченко,
А.В. Лютецкий,
Н.А. Пихтин,
А.Г. Гладышев,
Л.Я. Карачинский,
И.И. Новиков,
В.И. Кучинский,
А.Ю. Егоров,
Г.С. Соколовский
Publication year - 2019
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2019.20.48387.17905
Subject(s) - lasing threshold , cascade , terahertz radiation , laser , wavelength , optoelectronics , radiation , physics , optics , spectral width , absorption (acoustics) , materials science , chemistry , chromatography
We have studied the generation of frequency combs by quantum cascade lasers (QCLs) emitting in the 8-μm wavelength range. Results showed the presence of a self-pulsation regime near the lasing threshold. Further increase in the pumping current led to a sharp increase in width of the lasing spectrum, which allowed us to obtain frequency combs with a spectral width exceeding 1.5 THz. This behavior of QCLs can be explained by radiation absorption at the stripe edge that is related to the penetration of waveguide mode into unpumped regions.