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Technique for Generation of High-Energy Femtosecond Light Pulses Based on a Gain-Switched Laser Diode

Detailed Technology Description
This discoverysolves the challenge of amplifying and compressing pulses from a gain-switcheddiode with durations up to 150 fs and pulse energies above 1 uJ while reaching 10X peak powercomparably. A commercial laser based onthis discovery promises to replace expensive and relatively complex mode-lockedfiber lasers with a fully integrated optical device.
Others

Publications

  • Fu,Walter, Logan G. Wright, and Frank W. Wise. "High-power femtosecond pulseswithout a modelocked laser." Optica 4,831-834 (2017). DOI: 10.1364/OPTICA.4.000831
*Abstract

This technique preserves the ability of again-switched diode to generate pulses at variablerepetition rates, or even pulses ondemand. The pulse rate can be adjusted toaccommodate various applications resulting in reduces sample damage in microscopyapplications or more precise control of laser based material machining.

 

In the figure below: A commercial gain-switcheddiode emits pulses consisting of an intense, ~10-picosecond peak on top of acomplicated, semi-coherent background. The pulses are highly-chirped, as the transform-limited duration is only2 ps, and the measured autocorrelation is indicative of a complex residualphase. Propagating these pulses througha length of passive fiber (in this case, 10 meters of Nufern PM980-XP) causesthe intense component to experience strong self-phase modulation and developassociated spectral fringes, while the background undergoes negligible spectralevolution. Filtering around the red-mostspectral fringe separates the high-intensity component from the background,while shortening it to 3 picoseconds (within a factor of 1.5 of thetransform-limited duration). Thisprocess is referred to as nonlinear spectral-temporal filtering, and isillustrated in the figure below.

 

 

 

 

PotentialApplications

  • Replacement for mode-locked fiber lasers in productionenvironments
  • Microsurgery
  • Nonlinear microscopy
  • Micromachining
  • Advanced Imaging and Spectroscopy

Advantages

  • Higher energies than modelocked laser equivalent (µJ vs nJ)
  • Short pulse duration
  • Robust technology with minimal impact from environmentalfluctuations
  • Can be controlled to produce desired repetition rates orpulses on demand

 

Keywords: Physical Sciences, Engineering, Physics, Applied Physics, Optics & Photonics, Fiber Optics, Lasers, Measurement, Spectroscopy, Microscopy, Optoelectronics, Photonics, Manufacturing
*Licensing
Patrick Govangpjg26@cornell.edu1-607-254-2330
Country/Region
USA

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