High-Q resonant cavities for terahertz quantum cascade lasers

被引：13
作者：
Campa, A. [1 ,2 ]
Consolino, L. [1 ,2 ]
Ravaro, M. [1 ,2 ]
Mazzotti, D. [1 ,2 ]
Vitiello, M. S. [3 ,4 ]
Bartalini, S. [1 ,2 ]
De Natale, P. [1 ,2 ]
机构：
[1] CNR, Ist Nazl Ott, I-50125 Florence, Italy
[2] European Lab Non Linear Spect, LENS, I-50019 Sesto Fiorentino, FI, Italy
[3] CNR, Ist Nanosci, NEST, I-56127 Pisa, Italy
[4] Scuola Normale Super Pisa, I-56127 Pisa, Italy
来源：
OPTICS EXPRESS | 2015年 / 23卷 / 03期
关键词：
PHASE-LOCKING; SPECTROMETER; SPECTROSCOPY; COMB; RING;
D O I：
10.1364/OE.23.003751
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report on the realization and characterization of two different designs for resonant THz cavities, based on wire-grid polarizers as input/output couplers, and injected by a continuous-wave quantum cascade laser (QCL) emitting at 2.55 THz. A comparison between the measured resonators parameters and the expected theoretical values is reported. With achieved quality factor Q approximate to 2.5 x 10(5), these cavities show resonant peaks as narrow as few MHz, comparable with the typical Doppler linewidth of THz molecular transitions and slightly broader than the free-running QCL emission spectrum. The effects of the optical feedback from one cavity to the QCL are examined by using the other cavity as a frequency reference. (C) 2015 Optical Society of America
引用
收藏
页码：3751 / 3761
页数：11
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