Development of a burst mode oscillator free femtosecond fiber laser

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2023-1-25

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Kantoğlu, Hür Doğa

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Lasers with short pulse duration have a wide range of applications in industry and science, such as telecommunication, processing, imaging, and metrology. A conventional and well-known method for producing short pulses is mode locking. However, mode locking ultrashort lasers have a limitation on repetition rate because of the cavity length. Several techniques have been proposed to overcome this limitation, such as harmonic mode locking and adding a repetition rate multiplier into a system. Nevertheless, these methods increase system complexity and cost. High repetition rate ultrashort lasers are highly desired due to their promising capabilities in material processing as well as nonlinear optics and optical sampling. Usually adding a modulator into a high repetition rate source makes the laser operate on a burst mode regime with unique applications such as ablation cooled processing regime. In this study, a pulsed laser is created by combining two continuous-wave lasers and then the beat pulse is broadened by four-wave mixing. After the broadening, the beat pulse is compressed by the negative dispersion fiber. Our oscillator free laser system produces femtosecond pulses with picosecond pulse energy and tunable GHz intraburst repetition rate which is suitable for material processing.

Subject Keywords

Femtosecond laser, Burst mode laser, Four-wave mixing

URI

https://hdl.handle.net/11511/102538

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

H. D. Kantoğlu, “Development of a burst mode oscillator free femtosecond fiber laser,” M.S. - Master of Science, Middle East Technical University, 2023.