Terahertz-time domain spectrometer with 90 dB peak dynamic range

被引：184

作者：

Vieweg, N. ^{[1
]}

Rettich, F. ^{[1
]}

Deninger, A. ^{[1
]}

Roehle, H. ^{[2
]}

Dietz, R. ^{[2
]}

Goebel, T. ^{[2
]}

Schell, M. ^{[2
]}

机构：

[1] TOPTICA Photon AG, D-82166 Munich, Germany

[2] Heinrich Hertz Inst Nachrichtentech Berlin GmbH, Fraunhofer Inst Telecommun, D-10587 Berlin, Germany

来源：

JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES | 2014年 / 35卷 / 10期

关键词：

terahertz time domain spectroscopy; femtosecond fiber laser; InGaAs photoconductive switches; terahertz imaging; SPECTROSCOPY; TRANSMISSION; NOISE; GENERATION;

D O I：

10.1007/s10762-014-0085-9

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Many time-domain terahertz applications require systems with high bandwidth, high signal-to-noise ratio and fast measurement speed. In this paper we present a terahertz time-domain spectrometer based on 1550 nm fiber laser technology and InGaAs photoconductive switches. The delay stage offers both a high scanning speed of up to 60 traces / s and a flexible adjustment of the measurement range from 15 ps - 200 ps. Owing to a precise reconstruction of the time axis, the system achieves a high dynamic range: a single pulse trace of 50 ps is acquired in only 44 ms, and transformed into a spectrum with a peak dynamic range of 60 dB. With 1000 averages, the dynamic range increases to 90 dB and the measurement time still remains well below one minute. We demonstrate the suitability of the system for spectroscopic measurements and terahertz imaging.

引用

页码：823 / 832

页数：10

共 42 条

[1] PICOSECOND PHOTOCONDUCTING HERTZIAN DIPOLES [J].