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Second-harmonic generation
Second harmonic generation (also called frequency doubling or abbreviated SHG) is a nonlinear optical process, in which photons with the same frequency interacting with a nonlinear material are effectively 鈥渃ombined鈥?to generate new photons with twice the energy Ondrej Palat Jersey Youth , and therefore twice the frequency and half the wavelength of the initial photons. Second harmonic generation, as an even-order [url= ]customized large size and special shape CaF2 optics[url] effect, is only allowed in media without inversion symmetry. It is a special case of sum frequency generation and is the inverse of half-harmonic generation.
Second harmonic generation was first demonstrated by Peter Franken, A. E. Hill Alex Killorn Jersey Youth , C. W. Peters, and G. Weinreich at the University of Michigan, Ann Arbor, in 1961.[1] The demonstration was made possible by the invention of the laser Tyler Johnson Jersey Youth , which created the required high intensity coherent light. They focused a ruby laser with a wavelength of 694 nm into a quartz sample. They sent the output light through a spectrometer, recording the spectrum on photographic paper, which indicated the production of light at 347 nm. Famously, when published in the journal Physical Review Letters Luke Schenn Jersey Youth ,[1] the copy editor mistook the dim spot (at 347 nm) on the photographic paper as a speck of dirt and removed it from the publication.[2] The formulation of SHG was initially described by N. Bloembergen and P. S. Pershan at Harvard in 1962.[3] In their extensive evaluation of Maxwell鈥檚 equations at the planar interface between a linear and nonlinear medium, several rules for the interaction of light in [url= ]wholesale BBO nonlinear crystal[url] mediums were elucidated.
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Foreclosure homes in Houston: Ultimate means to find fair deals Business Articles | December 15, 2009
Most of the people checking the free listing sites frequently seem to be versed well with theHouston foreclosure homes. Such Internet viewers may be property owners, Re...


Most of the people checking the free listing sites frequently seem to be versed well with theHouston foreclosure homes. Such Internet viewers may be property owners Steven Stamkos Jersey Youth , Real estate agents or bankers for whom such properties really mean a lot. So, they keep an eye on what is happening in the market. The websites involved in such listings occasionally ask for credit card information. So, to reduce such hassles, investors should opt for email newsletters and RSS feeds and have themselves subscribed with a site. This will lead to fewer occurrences of any hassles while accessing the free listing sites.


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There are several Houston foreclosure homes that are intended for sale. Researching on them and comparing amongst various sites make it possible for people to find homes that are cheap and elegantly designed. Thus one can find dream homes as well properties meant for commercial purposes. Spaces, condos meant for business purposes can thus also be purchased in Houston. There are innumerable such properties that are listed on the various sites. They are also available at discounted rates. Thus one can find the best of the properties in these sites by consulting various websites.

Strategy to Sell Your Old Gold and Silver Jewelry

Posted On : Oct-13-2011 | seen (160) times | Article Word Count : 579 |

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