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We report on a Er:fiber-based optical frequency comb transferring the stability of ultra-stable lasers from 194THz to 429THz. Sub-Hz level transfer to a fiber-delivered 698.44nm output port for future Strontium QPN-limited lattice clocks is demonstrated

We report on a transportable photonic microwave synthesizer comprising an ultrastable laser and a ultra-low noise frequency comb. The last acts as a frequency divider, transferring the spectral purity from the optical to microwave domain.

The advent of long-term stable ultra-low noise (ULN) frequency combs opens new prospects for precision measurements. We characterize the stability of such ULN combs and present dual-comb precision spectroscopy of molecules and cavities.

We report on a Er:fiber-based optical frequency comb transferring the stability of ultrastable lasers from 194THz to 429THz. Sub-mHz level transfer to a fiber-delivered 698.44nm output port for future Strontium QPN-limited lattice clocks is demonstrated.

We investigated dual-color mid-infrared quantum cascade lasers. We found that due to gain competition mid-infrared modes tend to start lasing in higher order lateral modes. The mid-infrared mode with the lower threshold current reduces population inversion for the second laser with the higher threshold current due to stimulated emission. A theoretical model describing this effect was developed, which is important for future device optimization.

A resonant-phonon THz quantum cascade laser based on Al 0.03 Ga 0.097 As step well is demonstrated. Maximum pulsed operating temperature is 123 K, with threshold current densities as low as 110 A/cm2 at 10 K and 175 A/cm2 at 100 K.

The quantum cascade laser (QCL) is a semiconductor laser that employs radiative transitions of an electron between the bounded states in a superlattice (SL) and phenomenon of resonant tunnelling. Here we present a QCL that operates in the terahertz (THz) spectral region at wavelength of 95µm. Important difference compared to previous terahertz QCL's based on GaAs/AlGaAs material system is choice of In 0.47 Ga 0.53 As/In 0.48 Al 0.52 As lattice matched to InP which has lighter electron effective mass that should lead to higher gain and better operation [1].

We report operation of terahertz quantum cascade lasers at frequencies from 2.0 THz down to 1.2 THz by using a bound-to-continuum based lasing scheme which combines high injection efficiency and low intersubband absorption.