Terahertz quantum cascade VECSEL with watt-level output power
Terahertz quantum cascade VECSEL with watt-level output power
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DOI：
10.1063/1.5033910
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发表时间：
2018-07-02
影响因子：
4
通讯作者：
Williams, Benjamin S.
中科院分区：
文献类型：
--
作者：
Curwen, Christopher A.;Reno, John L.;Williams, Benjamin S.
报道了一种太赫兹量子级联垂直外腔面发射激光器（QCVECSEL），其输出功率通过使用放大超表面设计以增加功率密度而放大到瓦级。该超颖表面由加载有太赫兹量子级联增益材料的金属-金属波导天线耦合子腔的亚波长阵列组成。与先前展示的THz QC-VECSEL不同，子腔在其三阶横向模式谐振（TM 03）上操作，而不是其一阶（TM 01）谐振。这导致具有更高增益材料空间密度的超颖表面，从而导致每超颖表面面积的输出功率增加。在脉冲工作模式下，在77 K和6 K温度下，THz输出峰值功率分别达到830 mW和1.35W，同时保持了单模光谱和低发散角的光束模式。此外，压电控制的腔长允许约50 GHz的连续，单模调谐，而不会对输出功率或光束质量的显着影响。由AIP出版社出版。
We report a terahertz quantum-cascade vertical-external-cavity surface-emitting laser (QCVECSEL) whose output power is scaled up to watt-level by using an amplifying metasurface designed for increased power density. The metasurface is composed of a subwavelength array of metal-metal waveguide antenna-coupled sub-cavities loaded with a terahertz quantum-cascade gain material. Unlike previously demonstrated THz QC-VECSELs, the sub-cavities operate on their third-order lateral modal resonance (TM03), instead of their first-order (TM01) resonance. This results in a metasurface with a higher spatial density of the gain material, leading to an increased output power per metasurface area. In pulsed mode operation, peak THz output powers up to 830 mW at 77K and 1.35W at 6K are observed, while a single-mode spectrum and a low divergence beam pattern are maintained. In addition, piezoelectric control of the cavity length allows approximately 50 GHz of continuous, single-mode tuning without a significant effect on output power or beam quality. Published by AIP Publishing.