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Power scaling long-wavelength ytterbium-doped silica fiber lasers for frequency doubling to yellow.

机译：功率缩放长波长掺-石英光纤激光器，使频率加倍至黄色。

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摘要

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.; 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.
机译：设计了掺very石英光纤激光器和在很长波长下工作的放大器，并演示了其倍频至黄色的性能。在掺Yb3 +的二氧化硅中，要在这些长波长处获得有效的振荡和放大是困难的，这是由于可用增益低，以及来自具有较高发射截面的较短波长的增益竞争。这些挑战促使我们开发出减轻光暗化并最大程度地抑制高掺fiber量的石英纤维中放大自发发射（ASE）的技术。这些进步导致了集成光纤振荡器的发展，该光纤振荡器在1150 nm处工作，具有213 mW的CW输出功率，全宽半最大线宽为8 pm，偏振消光比为21 dB。使用其他ASE管理技术，我们开发了一种光纤放大器，可将振荡器功率调整为3.35 W CW和以微秒脉冲表示的平均功率2.25W。 CW放大器的输出功率在周期性极化的铌酸锂（PPLN）波导中倍频，从而在575 nm处产生255 mW的功率。微秒脉冲放大器的输出在大块周期性极化的近化学计量的钽酸锂（PPSLT）芯片中被加倍频率，使其平均功率接近1W。除了产生黄色辐射之外，还研究了缩放到光纤放大器中更高的平均功率和峰值功率的问题。特别是，研究了大模面积（LMA）光纤放大器的噪声特性，并研究了使用硅酸盐键合来减轻对光纤末端的损害并使反馈最小化的问题。

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  • 作者

    Sinha, Supriyo.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Engineering Electronics and Electrical.; Physics Optics.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 232 p.
  • 总页数 232
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;光学;工程材料学;
  • 关键词

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