Frequency tunable continuous THz wave generation in a periodically poled fiber
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Data
2015-05-01
Autores
Liu, Weilin
Zhang, Jiejun
Rioux, Maxime
Viens, Jeff
Messaddeq, Younes [UNESP]
Yao, Jianping
Título da Revista
ISSN da Revista
Título de Volume
Editor
Ieee-inst Electrical Electronics Engineers Inc
Resumo
An all-fiber approach to terahertz generation using a periodically poled optical fiber is proposed and experimentally demonstrated. In the proposed approach, a continuous-wave THz wave is generated at a periodically poled fiber by beating two optical wavelengths from two laser sources with the wavelength spacing corresponding to the frequency of the THz wave. The key component in the system is the periodically poled fiber, which is made by a twin-hole fiber with the fiber core residing between two holes. The twin-hole fiber is then thermally poled at a temperature of similar to 260 degrees C with a voltage of 3.3 kV applied to the silver electrodes inside the two holes to introduce second-order nonlinearity. The quasi phase matching (QPM) condition is achieved by periodically erasing the thermal poling induced second-order nonlinearity with an ultraviolet laser, which enhances the energy conversion efficiency. The proposed approach is validated by an experiment. The emission of a THz wave centered at 3.8 THz with an output power of 0.5 mu W is observed. The frequency tunability between 2.2 and 3.8 THz is also experimentally demonstrated.
Descrição
Palavras-chave
Difference frequency generation (DFG), Fiber nonlinear optics, Quasi-phase matching (QPM), Second-order nonlinearity, Terahertz (THz), Thermal poling
Como citar
Ieee Transactions On Terahertz Science And Technology. Piscataway: Ieee-inst Electrical Electronics Engineers Inc, v. 5, n. 3, p. 470-477, 2015.