Abstract
We explored the dynamics of frequency-modulated (FM) pulses in a cascaded fiber configuration comprising one active and one passive optical fiber with multiple fiber Bragg gratings (FBGs) of different periods inscribed over the fiber configuration length. We present a theoretical formalism to describe the mechanisms of the FM pulse amplification and pulse compression in such fiber cascades resulting in peak powers up to ~0.7 MW. In combination with the decreasing dispersion fibers, the considered cascade configuration enables pico- and sub-picosecond pulse trains with a sub-terahertz repetition rate and sub-kW peak power generated directly from the continuous optical signal.
Highlights
Photonics 2021, 8, 471. https://Fiber laser technology has recently been improved with the emerging ultrashort pulse (USP) sources emitting pulses of high peak power
We showed that the fiber cascaded configuration comprising one active and one passive optical fiber with inscribed fiber Bragg gratings (FBGs) enables a strong temporal comone active and one passive optical fiber with inscribed FBGs enables a strong temporal pression and amplification of the chirped pulse
We explored the evolution of FM pulses in fiber cascaded configurations comprising one active and one passive optical fiber with inscribed FBG arrays
Summary
Fiber laser technology has recently been improved with the emerging ultrashort pulse (USP) sources emitting pulses of high peak power. A simple way to overcome this limitation is to inscribe the array of refractive index fiber Bragg gratings with different periods distributed along the fiber length in a proper way This concept has been demonstrated to control the frequency-modulated (FM) pulse dynamics in [17,18,19,20,21]. FBG fabrication is a well-established technique [22,23]; in particular, it is 2 of widely used with grade-index multimode fibers and is promising for applications in highenergy and high-peak power laser pulsed sources [24,25,26,27,28,29,30]. A high repetition rate (terahertz) directly from the weakly modulated CW input light
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