Spectral gain narrowing of high-average power, regenerative chirped pulse thin-rod Yb:YAG amplifier was compensated by the regenerative spectral and pulse shaping technique. An average output power of 18 W was achieved at a repetition rate of 100 kHz with an output pulse width of below 1.2 ps. A wide spectral bandwidth of 2.5 nm was also observed. 2009 Optical Society of America OCIS codes: (1...

We report a mode-locked ytterbium fiber laser that generates femtosecond pulses with energies as large as 2.2 nJ. This represents a 20-fold improvement in pulse energy compared with that of previously reported femtosecond Yb fiber lasers. The laser produces pulses as short as 52 fs, which are to our knowledge the shortest pulses to date from a Yb fiber laser. The laser is diode pumped by a wave...

Ytterbium triflate efficiently catalyzes an unusual cyclization of o-hydroxybenzaldehydes with 2,3-dihydrofuran and 3,4-dihydro-2H-pyran in the presence of trimethyl orthoformate at ambient temperature to afford a new class of compounds, furoand pyrano[2,3-b]benzopyrans in excellent yields with high diastereoselectivity. Also, o-hydroxybenzaldehydes reacted smoothly with acetophenones in the pr...

We report on successful realization of a picosecond visible-continuum source embedding a single mode fiber taper. The output of ytterbium mode-locked fiber laser was frequency doubled in a periodically-polled lithium niobate (PPLN) crystal to produce green pump light. Spectral brightness of the white light generated in the tapered fiber was improved by limiting the broadening just to the visibl...

Single-mode ytterbium-doped phosphate all-solid photonic crystal fiber (AS-PCF) with 13.8 W output power and 32% slope efficiency was reported. By altering the diameter of the rods around the doped core and thus breaking the symmetry of the fiber, a polarization-maintaining AS-PCF with degree of polarization of >85% was also achieved, for the first time to knowledge, in a phosphate PCF.

The authors report the realization of a mixture atomic Bose-Einstein condensates highly magnetic erbium and nonmagnetic ytterbium by sympathetic cooling method. measurement trap lifetime shows good collisional stability against three-body losses.

0031-9007= We report the direct excitation of the highly forbidden 6s2 S0 $ 6s6p P0 optical transition in two odd isotopes of neutral ytterbium. As the excitation laser frequency is scanned, absorption is detected by monitoring the depletion from an atomic cloud at 70 K in a magneto-optical trap. The measured frequency in 171Yb (F 1=2) is 518 295 836 591:6 4:4 kHz. The measured frequency in 173...

We present a single-frequency, single-mode, plane-polarized ytterbium-doped all-fiber master oscillator power amplifier source at 1060 nm generating 264 W of continuous-wave output power. The final-stage amplifier operated with a high gain of 19 dB and a high conversion efficiency of 68%. There was no evidence of rollover from stimulated Brillouin scattering even at the highest output power, an...