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Optical frequency combs provide the clockwork to relate optical frequencies to radio frequencies. Hence, combs allow optical frequencies to be measured with respect to a radio frequency where the accuracy is limited only by the reference signal. In order to provide a stable link between the radio and optical frequencies, the two parameters of the frequency comb must be fixed: the carrier envelope...
We characterize a passively carrier envelope phase-stabilized Er:fiber laser frequency comb at 1550 nm. Phase noise of single comb lines over nearly an optical octave is measured via a delayed self-heterodyne beat of a cw clean-up laser. Repetition-rate stabilization achieves a RF-reference limited line-width. A lock to a low-noise optical reference shows Hz level out-of-loop line-widths. The measured...
We demonstrate terahertz (THz) frequency imaging and sensing using a single quantum cascade laser (QCL) device for both generation and sensing of THz radiation. Detection is achieved by utilising the effect of self-mixing in the THz QCL, and specifically by monitoring perturbations to the voltage across the QCL induced by light reflected from an external object back into the laser cavity. Self-mixing...
This paper investigates the performance of the Self-Mixing Interferometer (SMI) based on Vertical-Cavity Surface-Emitting Laser (VCSEL) under the influence of polarization mode switching due to optical feedback. The SMI signals are acquired using the variation in junction-voltage of the single mode VCSEL while the optical power in two orthogonal polarizations of the VCSEL fundamental mode are monitored...
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