We report the first experiment on a source based on type-II parametric downconversion for beam-like creation of a pair of degenerate, entangled photons at 1550 nm produced in a 12 mm long BBO crystal. The crystal is pumped with a femtosecond pulsed Ti-sapphire laser operating at 775 nm. ...
The following parameters of β-BBO have thus been determined: space group at room temperature R3, melting point 1095℃, phase transition temperature 925±5℃, transparent band range 190—2500mμ, phase matching angle at 539—270mμ 47°, and radiation damage threshold 2GW/em. Its effective ...
coli tesA, tesB, fadM, ybgC or yciA, among others) or long chain alcohol dehydrogenases (such as ucpA, ybbO, yiaY, betA, ybdH or eutG) for carboxylic acid or alcohol production, respectively. The term “appropriate” is used herein to refer to an enzyme with the required specificity ...
Several compounds of the Na2(Mn1−xFe2+x)2Fe3+(PO4)3 solid solution have been hydrothermally synthesized at 400 °C and 1 kbar; pure alluaudite-like compounds have been obtained for x = 0.00, 0.25, 0.50, 0.75, and 1.00. Rietveld refinements of the powder X-ray diffraction patterns...
Compounds of the Na-1.5(Mn1-xMx2+)(1.5)Fe-1.5(PO4)(3) (M2+ = Cd2+, Zn2+) alluaudite-type solid solutions were synthesized by solid-state reactions in air, ... F Hatert,L Rebbouh,RP Hermann,... 被引量: 0发表: 2005年 加载更多来源...
1 History of discovery of the low temperature phase barium metaborate (BBO)——an excel-lent new-type ultraviolet radiation frequency-doubling crystalline materialTHE first laser excitation in 1960 with ruby (α-Al_2O_3: Cr) as a laser crystal and the first dou-bling of frequency (347. 15...
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toxins Article Crystal Structure of the Receptor-Binding Domain of Botulinum Neurotoxin Type HA, Also Known as Type FA or H Guorui Yao 1, Kwok-ho Lam 1, Kay Perry 2, Jasmin Weisemann 3, Andreas Rummel 3 and Rongsheng Jin 1,* 1 Department of Physiology & Biophysics, University of ...
2) parametric down conversion 参量下转换 1. A pair of light quanta called signal and idler light quanta is produced through the nonlinear process of type Ⅰ spontaneous parametric down conversion with Ti∶sapphire femtosecond pulses. 利用钛宝石飞秒激光超短脉冲抽运BBO晶体 ,产生Ⅰ型自发光参量下...
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