A new coupling scheme of a 4.28-THz quantum-cascade laser is constructed by employing two off-axis parabolic reflectors. Two parallel terahertz beams are coupled out from the symmetrical facets of the wire laser. The total effective laser power of the terahertz beams is measured by a thermal power-meter under the modulation state. The highest value of the laser effective output power is about 1.4 W at a driving current of 19.3 A and a duty cycle of 1%. This dual-beam coupling scheme makes full use of the output power of the wire laser and has important applications in terahertz imaging and biological-effect research studies.

中文翻译：

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具有 >1 W 有效输出功率的双光束太赫兹量子级联激光器

通过采用两个离轴抛物面反射器构建了一种新的 4.28-THz 量子级联激光器耦合方案。两束平行的太赫兹光束从线激光器的对称面耦合出来。太赫兹光束的总有效激光功率在调制状态下由热功率计测量。在19.3 A的驱动电流和1%的占空比下，激光器有效输出功率的最高值约为1.4 W。这种双光束耦合方案充分利用了线激光器的输出功率，在太赫兹成像和生物效应研究中具有重要应用。