Measurement and Generation of Ultra-High Power Fiber Laser Pulses by Coherent Combination

摘要

In this seedling project, we studied the feasibility of coherently combining the output beams of multiple pulse-seeded fiber-optical amplifiers. Our procedure was to begin with a nanosecond seed pulse from a micro-disk laser, amplify it, and then develop a device to measure it in order to determine whether the pulses produced by currently available fiberlaser sources are sufficiently stable and possess sufficiently clean waveforms that it is conceivable that they can be combined coherently. As a result, we developed new single-shot frequency-resolved-optical gating (FROG) pulsemeasurement techniques with unprecedented spectral resolution and temporal range, with the ability to measure potentially extremely complex pulses on a single shot. Using this technology, we studied the pulses produced by an Ytfiber- amplified micro-disk laser. Although we found that the pulse shape became somewhat complex as amplification increased, we believe that the phase stability was sufficient.