Abstract

We use a single-photon avalanche detector array camera with pico-second timing accuracy to rapidly characterise and film the propagation of various laser pulses in optical fiber. We present results of supercontinuum generation and the tracking of a GHz pulse train.

Highlights

  • Recording processes and events that occur on sub-nanosecond timescales poses a difficult challenge

  • We report two main results: first, the observation of supercontinuum generation in photon crystal fiber (PCF) at a repetition rate of 80 MHz to investigate the evolution of the spectrum generation; and second, the observation of a train of femtosecond pulses at 803 nm at a repetition rate of 1 GHz to test the limit of the frequency at which the camera can operate

  • We record the generation of a supercontinuum by collecting photons scattered from the fiber cladding with a single-photon avalanche diodes (SPADs) camera, enabling the visualization of discrete wavelength ranges through the use of bandpass interference filters

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Summary

Introduction

Recording processes and events that occur on sub-nanosecond timescales poses a difficult challenge. We use a single-photon avalanche detector array camera with pico-second timing accuracy to detect photons scattered by the cladding in optical fibers. We use this method to film supercontinuum generation and track a GHz pulse train in optical fibers. The outgoing beam can be scanned to form an image[12] through the use of galvonometer mirrors to raster-scan both the outgoing beam and the returned photons to the collection fiber This increases acquisition times since all spatial positions cannot be measured simultaneously. It has been shown that per-pixel dwell times of just a few milliseconds can yield sufficient signal to recreate a depth image of the scene at 325 m standoff distance[13]

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