Gain measurements in strain-compensated quantum cascade laser

Spectrally resolved gain measurements of a strain-compensated quantum cascade laser, emitting at 4.8 μm, are presented. Measurements have been acquired using a multisection cavity technique. The shape of the gain is compared with electroluminescence measurements whereas gain coefficients are compared to values obtained from laser data, studying the dependence of the laser threshold current with cavity length. Gain coefficients of 9.9 cm kA−1 at 80 K and 3.2 cm kA−1 at 322 K are found and we show that the temperature dependence of the gain coefficient is governed by optical phonon scattering.

[1]  Carlo Sirtori,et al.  Short wavelength ( 3:4 m) quantum cascade laser based on strain-compensated InGaAs/AllnAs , 1998 .

[2]  Dmitry G. Revin,et al.  Dispersive gain and loss in midinfrared quantum cascade laser , 2008 .

[3]  Norihiko Sekine,et al.  Bloch gain in quantum cascade lasers , 2007 .

[4]  J. Massies,et al.  InAs∕AlAsSb based quantum cascade lasers , 2007 .

[5]  Mykhaylo P. Semtsiv,et al.  Short-wavelength (λ≈3.05μm) InP-based strain-compensated quantum-cascade laser , 2006 .

[6]  M. Beck,et al.  Gain measurements on GaAs-based quantum cascade lasers using a two-section cavity technique , 2000, IEEE Journal of Quantum Electronics.

[7]  Manijeh Razeghi,et al.  Temperature dependent characteristics of λ∼3.8μm room-temperature continuous-wave quantum-cascade lasers , 2006 .

[8]  Vincenzo Spagnolo,et al.  Influence of InAs, AlAs δ layers on the optical, electronic, and thermal characteristics of strain-compensated GaInAs∕AlInAs quantum-cascade lasers , 2007 .

[9]  Jerome Faist,et al.  Intersubband gain in a Bloch oscillator and Quantum cascade laser , 2003 .

[10]  Federico Capasso,et al.  1.6W high wall plug efficiency, continuous-wave room temperature quantum cascade laser emitting at 4.6μm , 2008 .

[11]  Wolfgang Bronner,et al.  High peak-power (10.5W) GaInAs∕AlGaAsSb quantum-cascade lasers emitting at λ∼3.6–3.8μm , 2007 .

[12]  Manijeh Razeghi,et al.  Room temperature continuous wave operation of quantum cascade lasers with watt-level optical power , 2008 .

[13]  Roland Teissier,et al.  InAs∕AlSb quantum cascade lasers emitting below 3μm , 2007 .