Journal
NATURE PHOTONICS
Volume 13, Issue 12, Pages 855-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-019-0518-z
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Funding
- National Science Foundation (NSF) [1150071, 1407711, 1711892]
- National Aeronautics and Space Administration (NASA) [NNX16AC73G]
- US DOE's National Nuclear Security Administration [DE-NA-0003525]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1711892] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1150071] Funding Source: National Science Foundation
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Changing the length of a laser cavity is a simple technique for continuously tuning the wavelength of a laser but is rarely used for broad fractional tuning, with a notable exception of the vertical-cavity surface-emitting laser (VCSEL)(1,2). This is because, to avoid mode hopping, the cavity must be kept optically short to ensure a large free spectral range compared to the gain bandwidth of the amplifying material. Terahertz quantum-cascade lasers are ideal candidates for such a short cavity scheme as they demonstrate exceptional gain bandwidths (up to octave spanning)(3) and can be integrated with broadband amplifying metasurfaces(4). We present such a quantum-cascade metasurface-based vertical-external-cavity surface-emitting laser (VECSEL) that exhibits over 20% continuous fractional tuning of a single laser mode. Such tuning is possible because the metasurface has subwavelength thickness, which allows lasing on low-order Fabry-Perot cavity modes. Good beam quality and high output power are simultaneously obtained.
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