Using the E22 transition of carbon nanotubes for fiber laser mode-locking
Using the E22 transition of carbon nanotubes for fiber laser mode-locking
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DOI：
10.1002/lapl.201010112
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发表时间：
2011-02
影响因子：
1.7
通讯作者：
J. Travers;J. Morgenweg;E. Obraztsova;A. Chernov;E. Kelleher;S. Popov
中科院分区：
文献类型：
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作者：
J. Travers;J. Morgenweg;E. Obraztsova;A. Chernov;E. Kelleher;S. Popov
我们表征了单壁碳纳米管样品的第二（E22）电子跃迁的可饱和吸收，并将其用于镱光纤环形激光器的锁模。调制深度为15%时，与相应的E11跃迁（13%）相似，但饱和强度（1220 MW cm-2）大约大一个数量级（10 MW cm-2）。我们实现了15 MHz的锁模脉冲序列的输出脉冲宽度为6.5 ps。为了比较，我们还展示了稳定的锁模E11过渡，相同的纳米管，与铒光纤环形激光器，产生1.1 ps的脉冲。使用E22跃迁应该能够在比目前可能的E11跃迁更短的波长下使用碳纳米管可饱和吸收体，这受到最小可实现的纳米管尺寸的限制。
We characterize the saturable absorption of the second (E22) electronic transition of a sample of single-walled carbon nanotubes and use it to mode-lock an ytterbium fiber ring laser. The modulation depth of ∼ 15% was found to be similar to the corresponding E11 transition (∼ 13%), but the saturation intensity (∼ 220 MW cm-2) about an order of magnitude larger (∼ 10 MW cm-2). We achieved a 15 MHz mode-locked pulse train with an output pulse duration of 6.5 ps. For comparison we also demonstrate stable mode-locking on the E11 transition, of the same nanotubes, with an erbium fiber ring laser, producing 1.1 ps pulses. Using the E22 transition should enable the use of carbon nanotube saturable absorbers at shorter wavelengths than currently possible with the E11 transition, which are limited by the smallest achievable nanotube dimensions.