Coherence at Short Wavelengths

Leonid Rybak, Lev Chuntonov, Andrey Gandman +2 more

We introduce a new scheme for generating short-wavelength coherent broadband radiation with well-controlled spectral characteristics. It is based on shaping long-wavelength femtosecond pulse to coherently control atomic resonance-mediated (2+1) three-photon excitation to a broad far-from-resonance continuum. Here, the spectrum (central frequency and bandwidth) of deep-ultraviolet coherent broadband radiation generated in Na vapor is experimentally controlled by tuning the linear chirp we apply to the driving phase-shaped near-infrared femtosecond pulse. This is a first step in implementing the full scheme for producing shaped femtosecond pulses at wavelengths down-to the vacuum-ultraviolet range.

Ingolf Volker Hertel, Claus-Peter Schulz

Roberto Buffa, Stefano Cavalieri, Marco V. Tognetti

We present a theoretical study of temporal compression of a short-wavelength laser pulse predicted in a real, Doppler-broadened, atomic system. The compression is the result of the coherent control peculiarities of electromagnetically induced transparency-propagation dynamics. Numerical results are reported and discussed, showing a temporal compression of 2 orders of magnitude (from 10 ns to 100 ps) of a 106.7-nm laser pulse in argon atoms at room temperature.

E. Wolf

Alfred Kastler

Satoshi Kako, Kazunori Hoshino, Shintaro Ishida +4 more

We present measurements of the second-order coherence function on emission from single GaN quantum dots. A large degree of photon antibunching is observed, demonstrating single-photon source operating at a record-short wavelength of 357 nm.