Efficient frequency upshift of 10 fs laser pulses propagating in a 5-cm length bireringent photonic crystal fibre

• 来源期刊: 中国物理B（英文版）
• 关键词: birefringent photonic crystal fibre femtosecond laser pulses frequency upshift
• 年，卷（期）: 2009,（5）
• 页码范围: 1996-2001
• 页数: 6页
• 语种: 英文

摘要

This paper reports that a 5-cm length birefringent photonic crystal fibre is used to tune the output frequency of unamplified 10-fs Ti:sapphire pulses. The zero dispersion of the fibre is at 823 nm and 800 nm for slow and fast fundamental modes, respectively. It is demonstrated that efficient upshift of the output frequency can be achieved when the pumped radiation is polarized along the slow axis of the fibre. When the average input power reaches 320 mW, about 60% of the output energy is located in one peak at 600 nm and is accompanied by depletion of the pulse inside the anomalous dispersion region.