Abstract
This paper reports the characteristics of an injection-seeded terahertz parametric oscillator (TPO) with a ring-cavity configuration based on the MgO:LiNbO3 crystal. The ring cavity is constituted of three mirrors and the THz wave output surface where the pump and Stokes beams are totally reflected. The THz pulse energies and the Stokes pulse energies as functions of the pump pulse energy for different seed powers of 47.5 mW, 150.7 mW, and 312.8 mW were investigated. The experimental results showed that the injection-seeded ring cavity TPO exhibited the benefits of lower pump thresholds and higher output energies for the Stokes and THz waves. The smaller the pump pulse energy, the more obvious the effect of the seed injection. The reasons for the laser performance improvement were analyzed.
Highlights
The application and development of terahertz (THz) technology are inseparable from the excellent terahertz radiation sources
This paper presents an injection-seeded ring cavity terahertz parametric oscillator (TPO) based on the MgO:LiNbO3 crystal
A 5.0 mol% MgO doped LiNbO3 crystal was used as the nonlinear crystal
Summary
The application and development of terahertz (THz) technology are inseparable from the excellent terahertz radiation sources. Terahertz parametric sources are important terahertz sources and have many advantages such as high peak power, continuous tuning, good temporal and spatial coherence, room temperature operation, compactness, and ease of use [1,2,3]. Their disadvantages are high pump threshold and low conversion efficiency. The principle of terahertz parametric sources is the stimulated polariton scattering (SPS) in nonlinear crystals [3,4]. The terahertz wave tuning can be obtained by adjusting the phase matching angle between the pump and Stokes beams [5,6]
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