Single shot SPIFI operating in the Fourier Domain is demonstrated for the first time to our knowledge. We present initial results capturing Fourier Domain single shot images with both one and two-dimensional detectors and demonstrate that the same enhanced frequency support that is characteristic of classical SPIFI translates directly into single shot SPIFI architectures as well. Linear Fourier Domain single shot SPIFI is systematically analyzed, for both types of detectors. Finally, we show that despite the complex pulse structure imposed on the illumination beam by SPIFI, nonlinear single shot SPIFI can be realized, and third harmonic generation imaging is demonstrated. Prepared by LLNL under Contract DE-AC52-07NA27344. LLNL-ABS-860152.
Spatial frequency modulated imaging (SPIFI) employs a structured line-shaped illumination, able to resolve beyond conventional resolution limits for coherent light with high speed. It produces image harmonics, with each order carrying a higher resolution. To date this method used rotating reticles to produce the necessary structured illumination, limiting image acquisition to about 100 μs. Here, we introduce a single-shot approach. We show that a super-resolved 1D image can be acquired with a single femtosecond pulse, with potential acquisition rates in the tens of kHz.
New spatial domain (SD) frequency modulation imaging (SPIFI) architectures are developed that enable the use of the full numerical aperture of long working distance excitation optics without sacrificing the field-of-view. When multiplexed with wavelength domain (WD) SPIFI, multiple advantages follow. One, the WD-SPIFI signals can be used to optimize the multiphoton SD-SPIFI signals. Two, these new SD-SPIFI architectures enable video rate SPIFI. Finally, applications of these new architectures to advanced manufacturing will be presented.
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