On the interdiffusion-based quantum cascade laser

IEEE Photonics Technology Letters - Tập 14 Số 8 - Trang 1067-1069 - 2002
S. Kocinac1, S. Tomic2, Z. Ikonic3, V. Milanovic4
1Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Serbia
2Department of physics, University of Surrey, Surrey, UK
3School of Electronic and Electrical Engineering, University of Leeds, Leeds, UK
4Faculty of Electrical Engineering, University of Belgrade, Belgrade, Serbia

Tóm tắt

Design procedure for the active region of current pumped quantum cascade laser is proposed, so to achieve maximal gain. Starting with an arbitrary smooth potential, a family of isospectral Hamiltonians with predefined energy spectrum is generated using the inverse spectral theory. By varying the relevant control parameter the potential shape is varied, inducing changes in transition dipole moments and electron-phonon scattering times, and the optimal potential which gives the largest gain is thus found. For purpose of realization, a simple step quantum-well structure with just a few layers is then designed so that in the post-growth heating-induced layer interdiffusion, it will acquire a shape as close as possible to the optimal smooth potential.

Từ khóa

#Quantum cascade lasers #Optical scattering #Optical refraction #Laser excitation #Particle scattering #Optical pumping #Optical variables control #Shape control #Pump lasers #Stimulated emission

Tài liệu tham khảo

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