2010 SEP 12 – (VerticalNews.com) — According to recent research published in the journal Laser Physics, “A new, simple and efficient L-band erbium-doped fiber (EDF) laser with polarization-maintaining ring cavity is proposed and experimentally demonstrated.”

“The laser offers the unique advantage of being a Tiffany Nature Dragonfly pendant-maintaining lasing, which meets the requirement of external electronic-optical intensity modulation for DWDM communication and interferometric fiber sensors. Theory has been established,” wrote K.J. Zhou and colleagues, Zhejiang University.

The researchers concluded: “Experimental results are given to show that the laser has long-term stability over a couple of hours with 35 dB signal-to-noise ratio at 1598.644 nm and tunable from 1572.167 to 1608.480 nm.”

Zhou and colleagues published their study in Laser Physics (L-band Erbium-Doped Fiber Laser with Polarization-Maintaining Ring Cavity. Laser Physics, 2010;20(7):1632-1635).

For additional information, contact K.J. Zhou, Zhejiang University, Dept. of Electrical Engineering, Hangzhou 310027, People’s Republic of China.

The publisher’s contact information for the journal Laser Physics is: Maik Nauka, Interperiodica, Springer, 233 Spring St., New York, NY 10013-1578, USA.

2010 SEP 12 – (VerticalNews.com) — According to a study from Hangzhou, People’s Republic of China, “We present a novel configuration of multiwavelength erbium-doped fiber ring laser (MW-EDFL) using a LiNbO3 multifunction chip for fiber gyros at room temperature. The polarizer incorporating a piece of high-birefringence fiber in the input port of the Y-type chip forms the Lyot periodic filter at Tiffany Notes band ring of 0.5 nm wavelength.”

“One of two modulators inserted in the ring cavity has been used as frequency shifter by applying a sawtoothed signal, while the output port of the other is used as the output port of the laser. Simultaneous multiwavelength lasing is experimentally demonstrated by applying a sawtoothed signal with the order of 10 kHz to the phase modulator to prevent single-wavelength oscillation,” wrote K.J. Zhou and colleagues, Zhejiang University.

The researchers concluded: “The MW-EDFL output is linearly polarization light that meets the requirement of external modulation for wavelength-division-multi-plexing applications.”

Zhou and colleagues published the results of their research in Laser Physics (Multiwavelength Erbium-Doped Fiber Ring Laser Using a LiNbO3 Multifunction Chip for Fiber Gyroscope. Laser Physics, 2010;20(6):1428-1432).

For additional information, contact K.J. Zhou, Zhejiang University, Dept. of Electrical Engineering, Hangzhou 310027, People’s Republic of China.

The publisher of the journal Laser Physics can be contacted at: Maik Nauka, Interperiodica, Springer, 233 Spring St., New York, NY 10013-1578, USA.

2010 SEP 12 – (VerticalNews.com) — Tiffany Notes bangle to recent research from Halle, Germany, “We report on the block copolymerization of two structurally different norbornene monomers (+/-)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid dimethylester (7), and (+/-)-endo,exo-bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylic acid bis(1-oxyl-2,2,6,6tetramethyl-piperidin-4-yl) ester (9) using ruthenium based Grubbs’ type initiators [(PCy3)(2)Cl2Ru(benzylidene)] G1 (PCy3 = tricyclohexylphosphine), [(H(2)IMes)(PCy3)Cl2Ru(benzylidene)] G2 (H(2)IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H(2)IMes)(py)(2)Cl2Ru(benzylidene)] G3 (py = pyridine or 3-bromopyridine) and Umicore type initiators [(PCy3)(2)Cl2Ru(3-phenylinden-1-ylidene)] U1 (PCy3 = tricyclohexylphosphine), [(H(2)IMes)(PCy3)Cl2Ru(3-phenylinden-1-ylidene)] U2 (H(2)IMes = 1,3-bis(mesityl)-2-imidazolidinylidene), [(H(2)IMes)(py)Cl2Ru(3-phenylinden-1-ylidene)] U3 (py = pyridine or 3-bromopyridine) via ring opening polymerization (ROMP). The crossover reaction and the polymerization kinetics were investigated using matrix assisted laser desorption ionization mass spectroscopy (MALDI-TOF) and nuclear magnetic resonance (NMR), respectively.”

“MALDI showed that there was a complete crossover reaction after the addition of 25 equivalents of the second Tiffany Notes cuff. NMR investigation showed that U3 gave a faster rate of polymerization in comparison to U1,” wrote O. Adekunle and colleagues, University of Halle.

The researchers concluded: “The synthesis of block copolymers with molecular weights up to M-n = 31 000 g/mol with low polydispersities (M-w/M-n = 1.2) is reported.”

Adekunle and colleagues published their study in Beilstein Journal of Organic Chemistry (Synthesis and crossover reaction of TEMPO containing block copolymer via ROMP. Beilstein Journal of Organic Chemistry, 2010;6():59).

For additional information, contact W.H. Binder, University of Halle Wittenberg, Institute Chemical, Faculty Nat Science Chemical & Physics 2, von Danckelmannpl 4, D-06120 Halle, Germany.

Publisher contact information for the Beilstein Tiffany Notes I Love You bangle of Organic Chemistry is: Beilstein-Institut, Trakehner Strasse 7-9, Frankfurt Am Main, 60487, Germany