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Sampled grating terahertz quantum cascade lasers
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DOI：10.1063/1.5066310.png)
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Abstract
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We demonstrate a metal-stripe sampled Bragg grating distributed feedback terahertz quantum cascade laser for power scaling up along with reliable single-mode emission. The major advantage is that the effective coupling coefficient can be flexibly engineered by tuning the sampling duty cycle. With sampled grating technology, the single-mode peak power of 186 mW is realized in a pulsed operation at 10 K, which is approximately 1.35 times that of the uniform grating laser. Besides, the horizontal beam pattern is close to the Gaussian distribution with ideal beam quality. Published under license by AIP Publishing.
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