Enhancement of Intracavity-Pumped Terahertz Parametric Oscillator Power by Adopting Diode-Side Pumped Configuration Based on KTiOPO4 Crystal
by
Feilong Gao
, Xingyu Zhang *, Zhenhua Cong, Zhaojun Liu, Xiaohan Chen, Zengguang Qin, Peng Wang, Jinjin Xu, Zecheng Wang and Na Ming
Feilong Gao, Xingyu Zhang *, Zhenhua Cong, Zhaojun Liu, Xiaohan Chen, Zengguang Qin, Peng Wang, Jinjin Xu, Zecheng Wang and Na Ming
School of Information Science and Engineering, Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao 266237, China
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(12), 666; https://doi.org/10.3390/cryst9120666
Received: 20 November 2019 / Revised: 7 December 2019 / Accepted: 9 December 2019 / Published: 11 December 2019
(This article belongs to the Section Crystalline Materials)
In this paper, a KTiOPO4 (KTP) crystal is used as the nonlinear medium in an intracavity-pumped terahertz parametric oscillator (TPO) based on stimulated polariton scattering (SPS). Almost all the reported intracavity SPS sources adopt the diode-end pumped configuration, and the THz output power is limited by the serious thermal effect and small fundamental beam size. For improving the THz output power, we propose diode-side pumping for the laser medium to get a higher fundamental power and a larger fundamental beam size. A convex–plane fundamental laser resonator is used to further offset the thermal effect and increase the fundamental beam size. The THz frequency of the intracavity-pumped KTP terahertz parametric oscillator can be discontinuously tuned from 3.19 THz to 5.94 THz with three gaps. The fundamental beam diameter in the KTP crystal is about 1.3 mm. The maximum average THz power is 166 μW at 5.74 THz under a pulse repetition frequency (PRF) of 6 kHz and a diode pump power of 98 W. By means of the diode-side pumped configuration, the maximum THz output power is more than two-fold higher compared to the diode-end pumped configuration reported using the KTP crystal.
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MDPI and ACS Style
Gao, F.; Zhang, X.; Cong, Z.; Liu, Z.; Chen, X.; Qin, Z.; Wang, P.; Xu, J.; Wang, Z.; Ming, N. Enhancement of Intracavity-Pumped Terahertz Parametric Oscillator Power by Adopting Diode-Side Pumped Configuration Based on KTiOPO4 Crystal. Crystals 2019, 9, 666.
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