LEADER 00000nam  2200361   4500 
001    AAI3281950 
005    20080423130445.5 
008    080423s2007    ||||||||||||||||| ||eng d 
020    9780549246091 
035    (UMI)AAI3281950 
040    UMI|cUMI 
100 1  Sinha, Supriyo 
245 10 Power scaling long-wavelength ytterbium-doped silica fiber
       lasers for frequency doubling to yellow 
300    232 p 
500    Source: Dissertation Abstracts International, Volume: 68-
       09, Section: B, page: 6041 
500    Adviser: Robert L. Byer 
502    Thesis (Ph.D.)--Stanford University, 2007 
520    Ytterbium-doped silica fiber lasers and amplifiers 
       operating at very long wavelengths were designed and 
       demonstrated for frequency doubling to the yellow. 
       Obtaining efficient oscillation and amplification at these
       long wavelengths in Yb3+-doped silica is difficult due to 
       the low available gain and gain competition from shorter 
       wavelengths with higher emission cross-sections. These 
       challenges led us to develop techniques to mitigate 
       photodarkening and maximize the suppression of amplified 
       spontaneous emission (ASE) in silica fiber with high 
       levels of ytterbium doping. These advances resulted in the
       development of an integrated fiber oscillator operating at
       1150 nm with 213 mW of CW output power with a full-width 
       half-maximum linewidth of 8 pm and a polarization 
       extinction ratio of 21 dB 
520    Using additional ASE management techniques, we developed a
       fiber amplifier that scaled the oscillator power to 3.35 W
       CW and 2.25 W of average power in microsecond pulses. The 
       CW amplifier output power was frequency doubled in a 
       periodically poled lithium niobate (PPLN) waveguide to 
       produce 255 mW of power at 575 nm. The output of the 
       microsecond-pulse amplifier was frequency doubled in a 
       bulk periodically poled near-stoichiometric lithium 
       tantalate (PPSLT) chip to nearly 1 W of average power. In 
       addition to generating yellow radiation, issues in scaling
       to higher average and peak powers in fiber amplifiers were
       studied. In particular, the noise characteristics of large
       -mode area (LMA) fiber amplifiers were investigated and 
       the use of silicate bonding to mitigate damage to fiber 
       ends and minimize feedback was explored 
590    School code: 0212 
590    DDC 
650  4 Engineering, Electronics and Electrical 
650  4 Physics, Optics 
650  4 Engineering, Materials Science 
690    0544 
690    0752 
690    0794 
710 2  Stanford University 
773 0  |tDissertation Abstracts International|g68-09B 
856 40 |uhttp://pqdd.sinica.edu.tw/twdaoapp/servlet/