Intracavity frequency doubling of Yb-doped fiber laser with 540–550 nm tuning

The intracavity doubling of a tunable Yb-doped fiber laser is studied. The phase effects are observed, analyzed and compensated. A smooth wavelength dependence of the second harmonic is obtained in the wavelength interval 540–550 nm. The second-harmonic output is greater than 300 mW at an LD pump power of 18 W.     

Compression of terahertz radiation in resonant systems with a quantum superlattice

It is shown theoretically that ultrashort terahertz electromagnetic pulses can be generated in resonant systems containing a quantum semiconductor superlattice. This effect is due to the compression of radiation incident on a cavity as a result of ultrafast self-modulation of the cavity Q factor upon cyclic switching of the superlattice from the screening to the transparent state in a pump field.     

Magnetically Controlled Terahertz Polarizationsensitive Filter Based on 5BDSR Microparticle Ferrofluid

Russian Physics Journal - The paper proposes the magnetically controlled polarization-sensitive filter operating in the range of 0.2 to 1.5 THz. This filter is based on the created magnetic fluid...     

Analysis of High-Frequency Acoustic Resonances of an Opto-Acoustic Detector with Differential Helmholtz Resonators

Optics and Spectroscopy - Acoustic resonances of an opto-acoustic detector (OAD) with differential cylindrical Helmholtz resonators are studied numerically upon variation of their main parameters....