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We report a drastic coupling reduction between orthogonal modes of a Nd:YAG laser when the gain crystal is cut along the <100> axis instead of <111>. Our measurements are accurately described by a simple theoretical model.
It is proposed and investigated the 8-cm-long slightly curved parallel plate oversized waveguide as wideband THz interconnecting line. Its use in waveguide TDS is demonstrated by measuring absorbance of tiny amount of water vapor.
We demonstrate a Quantum Cascade Laser employing ultra-strong (~20 meV) coupling between the injector and the upper laser state. The laser shows a pulsed wall-plug efficiency of 34%(8%) and peak power of 8.0 W(2.0 W) at 80 K(300 K).
Highly sensitive Faraday rotation measurements are performed on an ensemble of 87Rb. The deduced interaction strength is discussed in the context of spin squeezing. We present a method for spin state tomography based on Faraday rotation measurements.
A degenerate two-level system was investigated with circularly polarized probe and coupling lasers. An intensity dependent switch of an absorption peak to a dip was measured. The corresponding dispersion did not change.
We performed experiments demonstrated an effective energy-exchange between filament-forming beams intersecting in air. Theory considering the impulsive stimulated Raman response as the relevant nonlinear mechanism reproduces data well and points toward techniques for optimization.
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