We developed a module for dual-output, dual-wavelength lasers that facilitates multiphoton imaging and spectroscopy experiments and enables hyperspectral imaging with spectral resolution up to 5 cm−1. High spectral resolution is achieved by employing spectral focusing. Specifically, two sets of grating pairs are used to control the chirps in each laser beam. In contrast with the approach that uses fixed-length glass rods, grating pairs allow matching the spectral resolution and the linewidths of the Raman lines of interest. To demonstrate the performance of the module, we report the results of spectral focusing CARS and SRS microscopy experiments for various test samples and Raman shifts. The developed module can be used for a variety of multimodal imaging and spectroscopy applications, such as single- and multi-color two-photon fluorescence, second harmonic generation, third harmonic generation, pump-probe, transient absorption, and others.
The signal analysis-synthesis problems at a few femtosecond time scale demand the generation and study of broadband
similaritons. We generate similariton of ~100 nm bandwidth and characterize it experimentally to reveal its nature and
distinctive properties, and to describe it mathematically. We carry out the complete characterization of the broadband
similariton by means of its chirp measurement through the technique of spectral compression and frequency tuning in the
sum-frequency generation process. Our studies are of interest in view of applications of similariton to the solution of
signal analysis and synthesis problems in ultrafast optics, particularly for similariton-induced temporal lensing and
similariton-based spectral interferometry. Our developed method of similariton chirp measurement can also serve for the
fiber characterization.
We demonstrate pulse compression by generating nonlinear-dispersive similariton in fiber and its chirp cancellation in a
dispersive delay line, consisting of a pair of fused-silica dispersive prisms. The initial pulse with 11 nm bandwidth and
146 fs autocorrelation duration was used to form the similaritons with different bandwidths. We have synthesized
approximately transform-limited pulses of down to 25 fs autocorrelation duration, i.e. ≈ 17 fs duration, from a
similariton of 77 nm bandwidth. All obtained results are in a good agreement with the numerical simulations.
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