Excess noise generation during spectral broadening in a microstructured fiber

被引:22
作者
Ames, JN
Ghosh, S
Windeler, RS
Gaeta, AL
Cundiff, ST [1 ]
机构
[1] Univ Colorado, JILA, Boulder, CO 80309 USA
[2] Natl Inst Stand & Technol, Boulder, CO 80309 USA
[3] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA
[4] OFS Fitel Labs, Murray Hill, NJ 07974 USA
来源
APPLIED PHYSICS B-LASERS AND OPTICS | 2003年 / 77卷 / 2-3期
关键词
D O I
10.1007/s00340-003-1177-8
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We observe that nanojoule femtosecond pulses that are spectrally broadened in a microstructured fiber acquire excess noise. The excess noise is manifested as an increase in the noise floor of the rf spectrum of the photocurrent from a photodetector illuminated by the pulse train from the laser oscillator. Measurements are made of the intensity dependence of the excess noise for both 100 fs and sub- 10 A pulses. The excess noise is very strong for 100 fs pulses, but barely measurable for sub- 10 fs pulses. A rigorous quantum treatment of the nonlinear propagation of ultrashort pulses predicts that, for a fixed generated bandwidth, the amount of excess noise decreases with pulse duration, in agreement with the experimental results.
引用
收藏
页码:279 / 284
页数:6
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