Terahertz quantum cascade laser as local oscillator in a heterodyne receiver

Opt Express. 2005 Jul 25;13(15):5890-6. doi: 10.1364/opex.13.005890.


Terahertz quantum cascade lasers have been investigated with respect to their performance as a local oscillator in a heterodyne receiver. The beam profile has been measured and transformed in to a close to Gaussian profile resulting in a good matching between the field patterns of the quantum cascade laser and the antenna of a superconducting hot electron bolometric mixer. Noise temperature measurements with the hot electron bolometer and a 2.5 THz quantum cascade laser yielded the same result as with a gas laser as local oscillator.