Frequency tuning behaviour of terahertz quantum cascade lasers revealed by a laser beating scheme

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In the terahertz frequency range, the commercialized spectrometers, such as the Fourier transform infrared and time domain spectroscopies, show spectral resolutions between a hundred megahertz and a few gigahertz. Therefore, the high precision frequency tuning ability of terahertz lasers cannot be revealed by these traditional spectroscopic techniques. In this work, we demonstrate a laser beating experiment to investigate the frequency tuning characteristics of terahertz quantum cascade lasers (QCLs) induced by temperature or drive current. Two terahertz QCLs emitting around 4.2 THz with identical active regions and laser dimensions (150 μm wide and 6 mm long) are employed in the beating experiment. One laser is operated as a frequency comb and the other one is driven at a lower current to emit a single frequency. To measure the beating signal, the single mode laser is used as a fast detector (laser self-detection). The laser beating scheme allows the high precision measurement of the frequency tuning of the single mode terahertz QCL. The experimental results show that in the investigated temperature and current ranges, the frequency tuning coefficients of the terahertz QCL are 6.1 MHz/0.1 K (temperature tuning) and 2.7 MHz/mA (current tuning) that cannot be revealed by a traditional terahertz spectrometer. The laser beating technique shows potential abilities in high precision linewidth measurements of narrow absorption lines and multi-channel terahertz communications.

LIAO, XIAOYUChinese Academy of Sciences (författare)
LI, ZIPINGChinese Academy of Sciences (författare)
WAN, WENJIANChinese Academy of Sciences (författare)
ZHOU, KANGChinese Academy of Sciences (författare)
ZHAO, YIRANChinese Academy of Sciences (författare)
WANG, CHENJIEChinese Academy of Sciences (författare)
MA, XUHONGChinese Academy of Sciences (författare)
Wang, Shu Min,1963Chalmers tekniska högskola,Chalmers University of Technology,Chinese Academy of Sciences(Swepub:cth)shumin (författare)
CAO, J. C.Chinese Academy of Sciences (författare)
XU, DONGChinese Academy of Sciences (författare)
ZHANG, JUNWENFudan University (författare)
CHI, NANFudan University (författare)
LI, HUAChinese Academy of Sciences (författare)
Chinese Academy of SciencesShanghaiTech University (creator_code:org_t)

Av författaren/redakt...: GUAN, WEN; LIAO, XIAOYU; LI, ZIPING; WAN, WENJIAN; ZHOU, KANG; ZHAO, YIRAN; visa fler...; WANG, CHENJIE; MA, XUHONG; Wang, Shu Min, 1 ...; CAO, J. C.; XU, DONG; ZHANG, JUNWEN; CHI, NAN; LI, HUA; visa färre...

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