Wideband Electrically Controlled Vernier Frequency Tunable Terahertz Quantum Cascade Laser,ACS Photonics

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Wideband Electrically Controlled Vernier Frequency Tunable Terahertz Quantum Cascade Laser
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-04 , DOI: 10.1021/acsphotonics.9b01616
Iman Kundu ₁ , Joshua R. Freeman ₁ , Paul Dean ₁ , Lianhe Li ₁ , Edmund H. Linfield ₁ , A. Giles Davies ₁

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Frequency tuning in terahertz frequency quantum cascade lasers is challenging because of low thermal and current tuning coefficients. Moreover, photonic designs like Vernier selection based sampled gratings, used in telecom lasers to tune emission frequency, are unsuitable due to the long terahertz wavelengths and will require impractically long cavities (>15 mm). Here, we report the first wideband frequency tuning from a monolithic device exploiting Vernier selection rules using a coupled-cavity laser with a defect engineered photonic lattice. A precisely positioned defect lattice allows us to engineer the free spectral range and finesse of one of the cavities, similar to a sampled grating but using shorter cavity lengths (<4 mm). A coupled-cavity was used to tune the emission frequency. We achieve frequency tuning over 209 GHz, including mode hop-free continuous tuning of ∼6–21 GHz across six frequency bands, controlled through Stark shift, cavity-pulling, localized Joule heating, and thermal effects.

中文翻译：

宽带电控游标频率可调太赫兹量子级联激光器

由于太低的热和电流调谐系数，太赫兹频率量子级联激光器的频率调谐具有挑战性。此外，由于太赫兹波长较长，因此在电信激光器中使用的基于光子选择的采样光栅之类的光子设计不适合，因为太赫兹波长较长，并且需要不切实际的长腔体（> 15 mm）。在这里，我们报告了使用具有缺陷设计的光子晶格的耦合腔激光器，利用游标选择规则从单片设备进行的首次宽带频率调谐。精确定位的缺陷晶格使我们能够设计其中一个腔的自由光谱范围和精细度，类似于采样光栅，但使用更短的腔长度（<4 mm）。使用耦合腔来调整发射频率。我们实现了209 GHz以上的频率调谐，

更新日期：2020-03-05

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