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Simultaneous Light-Hole and Heavy-Hole Emission From an Intra-Cavity Contact Cryo-VCSEL With Dual-Wavelength Operation
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DOI：10.1109/jstqe.2026.3710344.png)
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Abstract
En 中文
The first demonstration of a single-active-region vertical-cavity surface-emitting laser (VCSEL) exhibiting dual-wavelength lasing under cryogenic operation is reported. At temperatures below 40 K, and most prominently at 8 K, the device emits at 830 nm and 867 nm from the same electrically pumped InGaAs quantum well active region. Through combined optical modeling, edge-emitting electroluminescence spectroscopy, polarization-resolved measurements, and <bold xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k<inline-formula><tex-math notation="LaTeX">$\cdot$</tex-math></inline-formula> p</b>-band structure analysis, we show that the two lasing wavelengths originate from distinct recombination pathways involving light-hole and heavy-hole transitions, respectively. Remarkably, the two wavelengths correspond to longitudinal cavity modes that are respectively anti-resonant and resonant with the quantum well gain region, demonstrating that conventional standing-wave gain enhancement is not a prerequisite for lasing in cryogenic VCSELs. The observed behavior is enabled by strong spectral broadening and increased radiative efficiency at cryogenic temperatures, which allow higher-order quantum well transitions to contribute significantly to laser gain. These results establish a new operating regime for VCSELs at cryogenic temperatures and open a route toward compact multiwavelength cryogenic VCSEL sources for wavelength-division multiplexed optical links in cryogenic computing and quantum information systems.
Keywords:
Cryo-VCSEL
VCSEL
cryogenics
dual- wavelength
light-hole emission
anti-resonant emission
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