29 January 2008 Interband cascade laser progress
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Recent advances in the development of mid-IR antimonide type-II "W" interband cascade lasers have led to a considerably improved high-temperature operation of the devices. We report an experimental investigation of four interband cascade lasers with wavelengths spanning the mid-infrared spectral range, i.e., 2.9-5.2 μm near room temperature in pulsed mode. One broad-area device had a pulsed threshold current density of only 3.8 A/cm at 78 K (λ = 3.6 μm) and 590 A/cm2 at 300 K (λ = 4.1 μm). The room-temperature threshold for the shortest-wavelength device (λ = 2.6-2.9 μm) was even lower, 450 A/cm2. A cavity-length study of the lasers emitting at 3.6-4.1 μm yielded an internal loss varying from 7.8 cm-1 at 78 K to 24 cm-1 at 300 K, accompanied by a decrease of the internal efficiency from 77% to 45%. Preliminary cw testing led to a narrow-ridge device from one of the wafers with emission at λ = 4.1 μm operating to 288 K, a new record for interband devices in this wavelength range.
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W. W. Bewley, W. W. Bewley, C. L. Canedy, C. L. Canedy, M. Kim, M. Kim, C. S. Kim, C. S. Kim, J. A. Nolde, J. A. Nolde, D. C. Larrabee, D. C. Larrabee, J. R. Lindle, J. R. Lindle, I. Vurgaftman, I. Vurgaftman, J. R. Meyer, J. R. Meyer, } "Interband cascade laser progress", Proc. SPIE 6909, Novel In-Plane Semiconductor Lasers VII, 69090X (29 January 2008); doi: 10.1117/12.766908; https://doi.org/10.1117/12.766908

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