中红外可调谐量子级联激光器研究进展

Research progress of tunable mid-infrared quantum cascade lasers

摘要:

量子级联激光器(QCL)是中红外波段重要的激光光源，其中，可调谐中红外量子级联激光器具有单纵模、频率可调谐的优点，成为目前研究的热点。可调谐中红外量子级联激光器主要通过分布反馈(DFB)光栅、分布布拉格反射(DBR)光栅、外腔衍射光栅等方法实现。本文介绍了中红外量子级联激光器的基本原理，分别归纳、总结了近年来DFB、DBR可调谐量子级联激光器以及外腔可调谐量子级联激光器的研究进展，讨论了各种可调谐方法的优缺点。最后，对可调谐量子级联激光器的发展趋势进行了展望。

Abstract:

Quantum Cascade Lasers(QCL) are the important laser sources in mid-infrared bands. The tunable mid-infrared quantum cascade laser has been a research focus because of tunable frequency and single longitudinal mode. At present, the tunable frequency of mid-infrared quantum cascade lasers can be realized by the Distributed Feed Back(DFB) grating, the Distributed Bragg Reflect(DBR) grating, the external cavity diffraction grating, etc. The principle and applications of mid-infrared quantum cascade laser are introduced. The progresses of the DFB and DBR tunable quantum cascade lasers, of the external cavity tunable quantum cascade lasers nearly 10 years are summarized. The advantages and disadvantages of various tunable methods are discussed. Finally, the development trends of tunable quantum cascade lasers are prospected.