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Proceedings Paper

Terahertz generation and detection using femtosecond mode-locked Yb-doped fiber laser
Author(s): Moon Sik Kong; Ji Su Kim; Sang-Pil Han; Namje Kim; Ki Won Moon; Kyung Hyun Park; Min Yong Jeon
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Paper Abstract

We successfully demonstrate a THz generation using an ytterbium (Yb)-doped mode-locked femtosecond fiber laser and a home-made low-temperature grown (LTG) InGaAs Photoconductive antenna (PCA) module for THz Time-domain spectroscopy (TDS) systems. The Yb-doped fiber ring laser consists of a pump laser diode (PLD), a wavelength division multiplexer (WDM) coupler, a single-mode fiber (SMF), a 25 cm-long highly Yb-doped fiber, two collimators, two quarter wave plates (QWPs), a half-wave plate (HWP), a 10 nm broadband band pass filter, an isolator, and a polarizing beam splitter (PBS). In order to achieve the passively mode-locked optical short pulse, the nonlinear polarization rotation (NPR) effect is used. The achieved center wavelength and the 3 dB bandwidth of the modelocked fiber laser are 1.03 μm and ~ 15.6 nm, respectively. It has 175 fs duration after pulse compression with 66.2 MHz repetition rate. The average output power of mode-locked laser has more than 275 mW. The LTG-InGaAs PCA modules are used as the emitter and receiver in order to achieve the THz radiation. The PCA modules comprise a hyper-hemispherical Si lens and a log-spiral antenna-integrated LTG-InGaAs PCA chip electronically contacted on a printed circuit board (PCB). An excitation optical average pumping and probing power were ~ 6.3 mW and 5 mW, respectively. The free-space distance between the emitter and the receiver in the THz-TDS system was 70 mm. The spectrum of the THz radiation is achieved higher than 1.5 THz.

Paper Details

Date Published: 2 May 2016
PDF: 8 pages
Proc. SPIE 9747, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX, 97471B (2 May 2016); doi: 10.1117/12.2212114
Show Author Affiliations
Moon Sik Kong, Chungnam National Univ. (Korea, Republic of)
Ji Su Kim, Chungnam National Univ. (Korea, Republic of)
Sang-Pil Han, Electronics and Telecommunications Research Institute (Korea, Republic of)
Namje Kim, Electronics and Telecommunications Research Institute (Korea, Republic of)
Ki Won Moon, Electronics and Telecommunications Research Institute (Korea, Republic of)
Kyung Hyun Park, Electronics and Telecommunications Research Institute (Korea, Republic of)
Min Yong Jeon, Chungnam National Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 9747:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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