Frequency locking of single-mode 3.5-THz quantum cascade lasers using a gas cell - art. no. 041111

[摘要]：We report frequency locking of two 3.5-THz third-order distributed feedback (DFB) quantum cascade lasers (QCLs) by using methanol molecular absorption lines, a proportional-integral-derivative controller, and a NbN bolometer. We show that the free-running

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