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Terahertz spectrometer up to 110 m single-pass measurement trace was realized by room-temperature GaSe:S down-converter operating at 0.2–0.6 THz range with 0.1 cm−1 high resolution. Ab-initio measurements were carried out in the real atmosphere.
This paper reports a 3-dimensional (3D) micro-optical coupling system for improving coupling efficiency in the Littrow configured micro-electro-mechanical system (MEMS) tunable lasers. In the coupling system, an optical fiber acts as a rod lens for light convergence in the vertical plane, while a deep-etched silicon parabolic mirror confines the light in the horizontal plane. Compared with previous...
We demonstrate a cross-(de)focusing assisted polarization spectroscopy technique for molecular alignment measurement, allowing us to identify the exact orientation of the pre-aligned molecules and reveal the weak ionization of the impulsive rotational Raman excitation.
By using field-free molecular alignment, we demonstrate the multi-filaments of ultrashort laser pulse with input spatial ellipticity can be suppressed to be a single core, or be controlled to various structures with modulated spectra.
Two-dimensional multicolored arrays of quadratic spatial solitons and up-converted parametric amplifications are observed through cascaded non-collinear quadratic processes in quadratic media, which can be switched by phase-insensitive weak beam control with second harmonic seeding pulses.
More than 3.5 W power at 1535 nm is efficiently generated from a cladding pumped Er:Yb codoped 14 cm-long phosphate fiber laser. The short cavity length shows potential capability for watt level single frequency output.
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