研究目的
Investigating the Kerr beam self-cleaning effect in graded index (GRIN) fibers at telecom wavelengths (1562 nm) and comparing its power threshold to that observed at 1 μm.
研究成果
The study demonstrates that Kerr beam self-cleaning occurs in GRIN fibers at telecom wavelengths with a significantly lower power threshold than at 1 μm. This finding opens new possibilities for the use of GRIN fibers in applications requiring high spatial beam quality at telecom wavelengths.
研究不足
The study is limited to observations at a specific wavelength (1562 nm) and does not explore the effect across a broader range of wavelengths. The power threshold reduction is attributed to the relatively small number of modes excited at the input, which may not hold under different excitation conditions.
1：Experimental Design and Method Selection:
The experiment involved launching 200 ps pulses at 1562 nm with a 10 nm bandwidth into a 50/125 GRIN fiber to observe the Kerr self-cleaning effect.
2：Sample Selection and Data Sources:
A 12 m long piece of GRIN fiber was used, with the laser beam coupled into it via a short section of standard single mode fiber (SSMF).
3：List of Experimental Equipment and Materials:
A GRIN fiber with a 50 μm core diameter, core-cladding index difference of
4：015, and numerical aperture of 2 was used. Experimental Procedures and Operational Workflow:
The near-field intensity distribution at the output of the GRIN fiber was observed for various input powers to study the transition from a speckled pattern to a bell-shaped pattern.
5：Data Analysis Methods:
The correlation factor between the near-field intensity and that computed for the fundamental mode was calculated, and the spectrum at the output of the GRIN fiber was measured for various peak powers.
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