Terahertz imaging using an optical frequency comb source

Dixiang Shao; Chen Yao; Tao Zhou; Rong Zhang; Zhanglong Fu; Songlin Zhuang; Juncheng Cao

doi:10.3788/COL201917.041101

Chinese Optics Letters, Volume. 17, Issue 4, 041101(2019)

Terahertz imaging using an optical frequency comb source

Dixiang Shao^1,2, Chen Yao², Tao Zhou², Rong Zhang², Zhanglong Fu², Songlin Zhuang¹, and Juncheng Cao^2、*

¹Shanghai Key Laboratory of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology, Shanghai 200093, China

²Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

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Figures & Tables(4)

Fig. 1. Experimental configuration of the THz imaging system. LD, laser diode; PM, phase modulator; MZM, Mach–Zehnderintensity modulator; RF, radio frequency source; UTC-PD, uni-traveling photodiode; LA, locked-in amplifier; SBD, Schottky barrier diode; PC, personal computer; PM1, PM2, PM3, and PM4, parabolic mirrors.

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Fig. 2. Output spectra of the experimentally generated combs when (a) $f \sim 8 GHz$ and DC bias voltage of $\sim 7.1 V$ is applied on the MZM. (b) $f \sim 15 GHz$ and DC bias voltage of $\sim 8.8 V$ is applied on the MZM.

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Fig. 3. Pictures of the sample under inspection: (a) the wrench, (b) the wrench sandwiched between two thick cardboards (each $\sim 3 mm$ thick).

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Fig. 4. Images of the wrench obtained by different optical sources. (a) Monochromatic source where two wavelengths are separated by $\sim 100 GHz$ . (b) Optical frequency combs with $f \sim 1 GHz$ and DC bias voltage of $\sim 10.4 V$ . (c) Optical frequency combs with $f \sim 8 GHz$ and DC bias voltage of $\sim 7.1 V$ . (d) Optical frequency combs with $f \sim 15 GHz$ and DC bias voltage of $\sim 8.8 V$ .

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Dixiang Shao, Chen Yao, Tao Zhou, Rong Zhang, Zhanglong Fu, Songlin Zhuang, Juncheng Cao, "Terahertz imaging using an optical frequency comb source," Chin. Opt. Lett. 17, 041101 (2019)

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Paper Information

Category: Imaging Systems

Received: Nov. 30, 2018

Accepted: Jan. 25, 2019

Published Online: Apr. 15, 2019

The Author Email: Juncheng Cao (jccao@mail.sim.ac.cn)

DOI:10.3788/COL201917.041101

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology