Resonant second-order nonlinear optical processes in quantum cascade lasers.
We demonstrate an efficient intracavity nonlinear interaction of laser modes in a specially adapted quantum cascade laser. A two-wavelength quantum cascade laser structure emitting at wavelengths of 7.1 and 9.5 micrometer included cascaded resonant optical intersubband transitions in an intracavity configuration leading to resonantly enhanced sum-frequency and second-harmonic generation at wavelengths of 4.1, 3.6, and 4.7 micrometer respectively. Laser peak optical powers of 60 and 80 mW resulted in 30 nW of sum-frequency signal and 10-15 nW of second-harmonic signal, both in good agreement with theoretical calculations.
Owschimikow
Nina
N
Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA.
Gmachl
Claire
C
Belyanin
Alexey
A
Kocharovsky
Vitaly
V
Sivco
Deborah L
DL
Colombelli
Raffaele
R
Capasso
Federico
F
Cho
Alfred Y
AY