منابع مشابه
Continuous Wave Coherent Lyman-a Radiation
The hydrogen atom is an important testing ground for fundamental theories. High resolution laser spectroscopy has provided cornerstones such as the measurement of fundamental constants, a test of quantum electrodynamics, and even the investigation of hadronic structure [1]. The recent production of antihydrogen atoms [2], albeit at almost the speed of light, has given prospect of a new field. P...
متن کاملContinuous Coherent Lyman-a Excitation of Atomic Hydrogen
The 1S-2P transition in atomic hydrogen has been observed for the first time with almost natural linewidth. We employ a unique source of continuous coherent Lyman-a radiation based on four-wave mixing in mercury. The output of the source has been improved 40-fold to yield 20 nW. This demonstration shows that laser cooling and detection with continuous Lyman-a radiation has excellent prospects f...
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Measuring the complex dielectric function ε(ω)= ε1 + iε2 of solidstate samples in the terahertz frequency range with high spectral resolution remains difficult. Using a continuous-wave terahertz spectrometer based on photomixing in the frequency range from 60GHz to 1.8 THz, we obtain the most precise data of ε(ω) reported to date for the well-studied example of α-lactose monohydrate. We are abl...
متن کاملContinuous-wave Submillimeter-wave Gyrotrons.
Recently, dynamic nuclear polarization enhanced nuclear magnetic resonance (DNP/NMR) has emerged as a powerful technique to obtain significant enhancements in spin spectra from biological samples. For DNP in modern NMR systems, a high power continuous-wave source in the submillimeter wavelength range is necessary. Gyrotrons can deliver tens of watts of CW power at submillimeter wavelengths and ...
متن کاملContinuous-wave coherent imaging with terahertz quantum cascade lasers using electro-optic harmonic sampling
We demonstrate a coherent imaging system based on a terahertz (THz)frequency quantum cascade laser (QCL) phase-locked to a near-infraredfs-laser comb. The phase locking enables coherent electro-optic sampling of the continuous-wave radiation emitted by the QCLthroughthe generation of a heterodyne beat-notesignal that carries the amplitude and phase of the laser field. We use this beat-note sign...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1999
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.83.3828