THz quantum cascade laser frequency combs

F. Mezzapesa, K. Garrasi, V. Pistore, Lianhe H. Li, A. Davies, E. Linfield, S. Dhillon, M. Vitiello
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Abstract

We demonstrate THz optical frequency comb (FC) operation based on ultra-broadband, record dynamic range Quantum Cascade Lasers (QCLs) which exploit a heterogeneous active region design to achieve low and flat chromatic dispersion at the center of the gain curve. By implementing a Gires-Tournois Interferometer (GTI), as tightly coupled at one end of the QCL cavity, we provide lithographically-independent control of the free-running coherence properties of such THz-QCL FC and attain wide dispersion compensation regions, where stable and narrow (~3 kHz linewidth) single beatnotes extend over an operation range that is significantly larger than that of dispersiondominated bare laser cavity counterparts.
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太赫兹量子级联激光频率梳
我们展示了基于超宽带记录动态范围量子级联激光器(qcl)的太赫兹光频梳(FC)操作,该激光器利用非均质有源区设计在增益曲线中心实现低而平坦的色散。通过在QCL腔的一端实现一个紧密耦合的gies - tournois干涉仪(GTI),我们提供了对这种太赫兹-QCL FC的自由运行相干特性的光刻无关控制,并获得了宽色散补偿区域,其中稳定和窄(~3 kHz线宽)的单beatnotes扩展的操作范围明显大于色散主导的裸激光腔。
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