Abstract
We present a new scheme for stabilizing diode lasers with optical feedback. This setup was designed with the intention to realize photonic local oscillators in terahertz receivers by means of mixing the radiation of two lasers on a LTG–GaAs mixer. Due to a novel second-order Littrow configuration the output beam has a circular shape and its direction is independent of laser frequency. Side mode and spontaneous emission background suppression is achieved with an intracavity etalon. Our results fully satisfy the requirements for heterodyne receivers with hot electron bolometer (HEB) mixers, and there are good prospects that the more demanding requirements for SIS-mixers can be also fulfilled.
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