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

Journals >Chinese Optics Letters >Volume 17 >Issue 4 >Page 041101 > Article

Chinese Optics Letters
Vol. 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、*

Author Affiliations

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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DOI: 10.3788/COL201917.041101 Cite this Article Set citation alerts

Dixiang Shao, Chen Yao, Tao Zhou, Rong Zhang, Zhanglong Fu, Songlin Zhuang, Juncheng Cao. Terahertz imaging using an optical frequency comb source[J]. Chinese Optics Letters, 2019, 17(4): 041101 Copy Citation Text

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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.

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

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[J]. Chinese Optics Letters, 2019, 17(4): 041101

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