Coherent combining of two quantum-cascade lasers in a Michelson cavity.
We developed a Michelson-type cavity to achieve coherent combining of two quantum-cascade lasers, emitting at around 4.5microm. We report a cw combining efficiency of 85% (up to 91% near threshold) with good beam quality (M(2)<1.4). Despite the interferometric nature of the coupling mechanism, this type of cavity can withstand disturbance from the laboratory environment without significant power fluctuations. Finally, the spectral behavior and the output power dependence on current are explored.
Thales Research and Technology, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France. guillaume.bloom@thalesgroup.com
Guillaume
G
Bloom
Christian
C
Larat
Eric
E
Lallier
Mathieu
M
Carras
Xavier
X
Marcadet