High-average power ultra-broadband infrared radiation generation

Zachary Epstein; Bahman Hafizi; Joseph Peñano; Phillip Sprangle

doi:10.1117/12.2306605

8 May 2018 High-average power ultra-broadband infrared radiation generation

Zachary Epstein, Bahman Hafizi, Joseph Peñano, Phillip Sprangle

Proceedings Volume 10638, Ultrafast Bandgap Photonics III; 106381V (2018) https://doi.org/10.1117/12.2306605
Event: SPIE Defense + Security, 2018, Orlando, FL, United States

Abstract

High-average power, ultra-broadband, mid-IR radiation can be generated in a nonlinear medium by illuminating it with a multi-line laser radiation. Propagation of a multi-line CO₂ laser beam in a nonlinear medium, e.g. gallium arsenide or chalcogenide, will generate directed, broadband, IR radiation in the atmospheric window (2-13 μm). A 3-D laser code for propagation in a nonlinear medium has been developed to incorporate extreme spectral broadening resulting from the beating of several wavelengths. The code has the capability to treat coupled forward and backward propagating waves. In addition, we include transverse and full linear dispersion effects. Methods for enhancing the spectral broadening are proposed and analyzed; in particular, grading the refractive index radially will tend to guide the CO₂ radiation and extend the interaction distance, allowing for enhanced spectral broadening. Finally, we show that the laser phase noise associated with the finite CO₂ linewidths can significantly enhance the spectral broadening. In a dispersive medium laser phase noise results in laser intensity fluctuations. These intensity fluctuations result in spectral broadening due to the self-phase modulation mechanism.

Citation Download Citation

Zachary Epstein, Bahman Hafizi, Joseph Peñano, and Phillip Sprangle "High-average power ultra-broadband infrared radiation generation", Proc. SPIE 10638, Ultrafast Bandgap Photonics III, 106381V (8 May 2018); https://doi.org/10.1117/12.2306605

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