Abstract
Generalized Phase Contrast (GPC) is a versatile tool for efficiently rerouting and managing photon energy into speckle-free contiguous spatial light distributions. We have previously shown theoretically and numerically that a GPC Light Shaper shows robustness to shift in wavelength and can maintain both projection length scale and high efficiency over a range [0.75λ(0); 1.5λ(0)] with λ(0) as the characteristic design wavelength. With this performance across multiple wavelengths and the recent availability of tabletop supercontinuum lasers, GPC light shaping opens the possibility for creatively incorporating various multi-wavelength approaches into spatially shaped excitations that can enable new broadband light applications. We verify this new approach using a supercontinuum light source, interfaced with a compact GPC light shaper. Our experiments give ~70% efficiency, ~3x intensity gain, and ~85% energy savings, limited, however, by the illumination equipment, but still in very good agreement with theoretical and numerical predictions.
Highlights
1.1 Multi-wavelength light shapingMany important applications of the interaction of light with matter strongly depend on the illumination wavelength
We have previously shown theoretically and numerically that a Generalized Phase Contrast (GPC) Light Shaper shows robustness to shift in wavelength and can maintain both projection length scale and high efficiency over a range [0.75λ0; 1.5λ0] with λ0 as the characteristic design wavelength
We briefly review the optimization of a GPC Light Shaper (LS) system in section 2 and consider the physical effects of changing the illumination wavelength
Summary
Many important applications of the interaction of light with matter strongly depend on the illumination wavelength. The way electrons move between atomic energy levels depend on the interacting photons’ energy, which in turn can be controlled by a proper choice of wavelength. For such studies, a laser source containing multiple wavelengths is much more versatile than normal monochromatic lasers. As laser sources typically have limited shapes, many light shaping approaches have been studied to address different demands such as efficiency, speed, beam quality or economy concerns. It becomes important to shape light with consistent output dimensions and efficiency across different wavelengths
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