The development of high-performance, room-temperature, continuous wave (CW), widely-tunable terahertz (THz) lasers has attracted considerable industrial interest and has shown great potential for applications in various fields ranging from THz spectroscopy and biomedical imaging to safety and security applications. Among the commonly used lasers, direct quantum cascade lasers are regarded as the most popular sources offering the highest-to-date wall-plug efficiency. However, such lasers generally require cryogenic cooling and suffer from the drawbacks in terms of the production complexity and the lack of broad tunability. On the other hand, high-performance laser sources based on semiconductor disk lasers (SDLs) and periodically-poled ferroelectric crystals can offer an access to new wavelengths not covered by available gain media, particularly in the THz spectral region.
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