Abstract
Enhanced terahertz wave generation via Stokes wave recycling in a non-synchronously picosecond pulse pump configuration has been demonstrated. It is theoretically analyzed that under the condition of high pump peak power density, the oscillation of the strong 1st order Stokes wave could benefit the higher order Stokes wave emission and terahertz wave generation. In the experiment, 5.71 times enhancement of terahertz wave generation was obtained via Stokes wave recycling in the non-synchronously picosecond pulse pumped terahertz parametric generator compared with the conventional single-pass terahertz parametric generation. The maximum terahertz wave average power was 61.7 μW under the pump power of 20 W and the cavity length of 170 mm, while the maximum power conversion efficiency was 3.085 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-6</sup> .
Highlights
The terahertz (THz) wave is attractive for more and more researchers because of its potential in a wide variety of applications in condensed matter physics, chemical engineering, life sciences and homeland security [1]–[2]
5.71 times enhancement of terahertz wave generation was obtained via Stokes wave recycling in the non-synchronously picosecond pulse pumped terahertz parametric generator compared with the conventional single-pass terahertz parametric generation
We proposed the enhanced THz wave generation via Stokes wave recycling based on a non-synchronously picosecond pulse pump configuration
Summary
The terahertz (THz) wave is attractive for more and more researchers because of its potential in a wide variety of applications in condensed matter physics, chemical engineering, life sciences and homeland security [1]–[2]. In the fields of the THz science and technology, high power THz sources is crucial concerns for researchers. It is one of most promising methods to generate THz wave by stimulated polariton scattering (SPS) [3] in LiNbO3 (MgO:LN) crystal. Picosecond (ps) pulse pumped terahertz source could suppress the SBS effect and increase the conversion efficiency by about one order [23]. At this kind of maximum pump energy, broadband 1st order Stokes wave spectrum was observed over the 1069.08-1071.56 nm spectral region. We achieved a broad THz wave spectrum, ranging from 1.24 to 1.89 THz
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