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Generation of a broadband continuum by a Ti:sapphire femtosecond oscillator with a 1-GHz repetition rate

机译:Ti:蓝宝石飞秒振荡器以1 GHz的重复频率生成宽带连续体

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摘要

A five-element Ti:sapphire femtosecond ring oscillator emitting a broadband continuum that ranges from 560 to 1150 nm at -50 dB below the maximum with a repetition rate of 1 GHz is demonstrated. The key element is a slightly convex cavity mirror that increases the self-amplitude modulation of a short pulse inside the resonator. Flat negative intracavity group-delay dispersion is required only for the core spectral part of the pulse. We believe that the device presented will make optical frequency metrology and future optical atomic clocks simpler and more stable. Within the reported ultrabroad spectrum a distinct strong emission band near 655 nm occurs that can be extracted to a powerful femtosecond pulse source far out of the amplification of Ti:sapphire.
机译:演示了一个五元素的Ti:蓝宝石飞秒环形振荡器,其发射的宽带连续范围在最大最大值以下-50 dB时在560至1150 nm范围内,重复频率为1 GHz。关键元件是一个略微凸形的腔镜,它可以增加谐振器内部短脉冲的自幅调制。仅对于脉冲的核心频谱部分,才需要平坦的负腔内组延迟色散。我们相信,所展示的设备将使光频率计量学和未来的光原子钟变得更简单,更稳定。在报告的超宽光谱内,出现了一个在655 nm附近的明显强发射带,可以将其提取到强大的飞秒脉冲源中,而远未经过Ti:蓝宝石的放大。

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