Download 50.Quantum Electronics by John G. Webster (Editor) PDF

Light

By John G. Webster (Editor)

Show description

Read or Download 50.Quantum Electronics PDF

Similar light books

Polymers and Light

S. Georgiou: Laser cleansing Methodologies of Polymer Substrates. - T. Lippert: Laser program of Polymers. - J. Krueger, W. Kautek: Ultrashort Pulse Laser Interactions with Polymers and Dielectrics. - Y. Zhang: Synchrotron Radiation Direct Photo-Etching of Polymers.

Light Scattering and Photon Correlation Spectroscopy

For the reason that their inception greater than 2. five years in the past, photon correlation thoughts for the spatial, temporal or spectral research of fluctuating gentle fields have chanced on an ever-widening diversity of purposes. utilizing detectors which re­ spond to unmarried quanta of the radiation box, those equipment are intrinsically electronic in natnre and in lots of experimental events supply a distinct measure of accuracy and sensitivity, not just for the learn of fundamental gentle assets themselves, yet so much relatively within the use of a laser-beam probe to review gentle scattering from natural fluids, macromolecular suspensions and laminar or turbulent flowing fluids and gases.

Mesons and Light Nuclei: Proceedings of the 5th International Symposium, Prague, September 1–6, 1991

Giving emphasis on electroweak nuclear interactions the ebook collects greater than 60 papers provided on the fifth foreign Symposium, Prague, September 1-6, 1991. additional issues coated are: nuclear physics with pions and antiprotons, nuclar physics with unusual debris, relativistic nuclear physics, and quark levels of freedom.

The Physics and Engineering of Solid State Lasers

This article explains the mutual impacts among the actual and dynamic procedures in solids and their lasing homes. It offers perception into the physics and engineering of strong nation lasers through integrating info from numerous disciplines, together with reliable nation physics, fabrics technological know-how, photophysics, and dynamic approaches in solids.

Extra resources for 50.Quantum Electronics

Example text

Linear flashlamps have a tubular quartz envelope with tungsten electrodes sealed at the ends. A shortduration high-voltage pulse applied to the electrodes results in intense emission over a large spectral range (Fig. 1). This is coupled to the dye solution by suitably designed enclosures with specular reflectors for imaging the lamp on the dye solution. The dye solution is flown through a cell made of fused silica at a fast speed for removal of heated dye solution between pump pulses. An important design consideration for these dye lasers is to minimize the risetime of the discharge pulses, which is limited by the impedance of the discharge.

Although weak, the large concentration of dye molecules in the ground state makes its influence significant. GSA is responsible for a red shift of the peak of the gain spectrum from the peak of the fluorescence spectrum. The shift increases with increase in dye concentration and with decrease in pump power. Although a wide variety of pump sources with different wavelengths or with broad spectra may be used for pumping the same dye, use of pump sources with ␭p close to the longest-wavelength absorption band reduces loss of photon energy (h␯p Ϫ h␯l) by internal conversion and vibrational relaxation.

Moreover, IS ≡ σ0p Ip τ + 1 (σe + σ0 )τ is the saturation intensity that determines the extent of gain saturation by the laser, as is clear from the first term in Eq. (5). The increase of IS with pump intensity represents the fact that at higher pump intensities the molecules brought down to S0 will be recycled back to S1 at a faster rate; a higher laser intensity is then required to saturate the gain. Finally, the last term in Eq. (5), with σ σ τN S ≡ 0 12 σ0p Ip τ + 1 describes a nonlinear loss arising out of absorption of two laser photons by molecules from S0 and subsequently from S1 (13).

Download PDF sample

Rated 4.62 of 5 – based on 32 votes