Abstract
Multi-Watt high-power terahertz (THz) frequency quantum cascade lasers are demonstrated, based on a single, epitaxially grown, 24-μm-thick active region embedded into a surface-plasmon waveguide. The devices emit in pulsed mode at a frequency of ∼4.4 THz and have a maximum operating temperature of 132 K. The maximum measurable emitted powers from a single facet are ∼2.4 W at 10 K and ∼1.8 W at 77 K, with no correction being made for the optical collection efficiency of the apparatus, or absorption by the cryostat polyethylene window.
Highlights
Terahertz (THz) frequency radiation has many potential applications, ranging from imaging, bio- and chemical-sensing, and non-destructive testing, through to security scanning, industrial process monitoring, and telecommunications [1, 2]
A high-power THz source is attractive for the investigation of non-linear physics at THz frequencies
We previously demonstrated 1.01 W peak output powers (Ppeak) from a broad-area THz quantum cascade laser (QCL) [6]
Summary
Terahertz (THz) frequency radiation has many potential applications, ranging from imaging, bio- and chemical-sensing, and non-destructive testing, through to security scanning, industrial process monitoring, and telecommunications [1, 2]. We previously demonstrated 1.01 W peak output powers (Ppeak) from a broad-area THz QCL [6]. THz QCLs with Ppeak of up to 470 mW per facet at 5 K have been demonstrated, using a direct wafer-bonding technique to stack two separate 10-μm-thick THz QCLs together, thereby increasing the active region thickness [8].
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