Abstract: An optical-resolution photoacoustic microscopy (OR-PAM) system for visualizing water content deep in biological tissue uses an all-fiber 1930-nm hybrid optical parametrically-oscillating emitter. The emitter includes a tunable laser source whose output is amplified by a first erbium-doped fiber amplifier (EDFA). The output of the first amplifier is modulated with a Mach-Zehnder amplitude modulator that receives an RF signal with a nanosecond pulse width and a multiple kilohertz repetition rate. A second EDFA further amplifies the signal and passes it to a fiber circulator that in turn delivers it to a 1950/1550 mm fiber wavelength-division-multiplexing coupler WDM. The coupler introduces the signal to a cavity that includes a spool of highly nonlinear fiber and a Thulium-doped fiber amplifier TDFA. From the TDFA the signal reaches a 50/50 fiber coupler that sends part to a second output TDFA and guides part back to the cavity through a port of the WDM.

Abstract: The present invention provides a fiber laser system, comprising: a master laser cavity for generating a master laser beam; a beam splitter for splitting the master laser beam into a first beam for generating a first color pulsed laser beam and a second beam for generating a second color pulsed laser beam; and a synchronization component configured to synchronize the first color pulsed laser beam and a second color pulsed laser beam based on coherent wavelength generation.

Abstract: The panoramic-reconstruction temporal imaging (PARTI) system is a single-shot optical waveform measurement apparatus that achieves scalable record length and sub-picosecond resolution simultaneously for ultrafast non-repetitive waveform characterization, in analogy with the wisdom of stitching multiple mosaic images to achieve larger-field-of-view in the spatial domain. It consists of a high-fidelity optical buffer, a low-aberration time magnifier and synchronization-control electronics. For specific measurement circumstances, the PARTI system can also be carried out based on a passive optical buffer, which reduces the system complexity. The PARTI system is configured for real-time single-shot characterization of non-repetitive optical dynamic waveform that evolves over a time scale much larger than that of its ultrafast temporal details, i.e., optical dynamics with large time-bandwidth product.

Abstract: The panoramic-reconstruction temporal imaging (PARTI) system is a single-shot optical waveform measurement apparatus that achieves scalable record length and sub-picosecond resolution simultaneously for ultrafast non-repetitive waveform characterization, in analogy with the wisdom of stitching multiple mosaic images to achieve larger-field-of-view in the spatial domain. It consists of a high-fidelity optical buffer, a low-aberration time magnifier and synchronization-control electronics. For specific measurement circumstances, the PARTI system can also be carried out based on a passive optical buffer, which reduces the system complexity. The PARTI system is configured for real-time single-shot characterization of non-repetitive optical dynamic waveform that evolves over a time scale much larger than that of its ultrafast temporal details, i.e., optical dynamics with large time-bandwidth product.

Abstract: A spatio-temporally incremental fiber sweep source includes a laser light pulse generator for generating light pulses and a fiber array of individual optical fibers. The fiber array has an input end and an output end, with the fibers at the input end receiving the light pulses substantially simultaneously. The optical fibers at the output end are arranged in a raster scan pattern, e.g., a square pattern, wherein the optical delay in each fiber is greater than the previous one in the scan pattern direction. As a result light exits the array in a completely optical two dimensional raster scan pattern. It has no moving parts, and thus no mechanical inertia, so extremely high speed scanning can be achieved.

Abstract: A spatio-temporally incremental fiber sweep source includes a laser light pulse generator for generating light pulses and a fiber array of individual optical fibers. The fiber array has an input end and an output end, with the fibers at the input end receiving the light pulses substantially simultaneously. The optical fibers at the output end are arranged in a raster scan pattern, e.g., a square pattern, wherein the optical delay in each fiber is greater than the previous one in the scan pattern direction. As a result light exits the array in a completely optical two dimensional raster scan pattern. It has no moving parts, and thus no mechanical inertia, so extremely high speed scanning can be achieved.

Abstract: Systems and methods for non-invasive optical imaging are provided. One or more time-lenses can be utilized to perform an optical Fourier transform, and the time-to-wavelength conversion can generate a wavelength-encoded image of optical scattering, analogous to optical coherence tomography. This optical Fourier transform provides improved axial resolution and simplifies digital signal processing after data acquisition.

Abstract: An optical coherent tomographic imaging system includes means for introducing a 180-degree phase inversion in the interference fringes, and generating a two-peak shape point spread function (PSF) in the frequency domain for the interference-based tomographic imaging system. The system further includes means for achieving sharper resolution than the diffraction-limited spectral bandwidth in the tomographic imaging system through subtracting the two-peak shape from the original Gaussian PSF. Means are provided for removing the ghost fringes in the tomographic imaging system, which is introduced by the self-interference between the different layers of the sample arm. The apparatus is configured to realize the real-time super-resolution swept-source optical coherent tomography (OCT) such that the sensitivity of the system is enhanced by suppressing the noise floor in the frequency domain, as well as removing the ghost fringes.

Abstract: Systems and methods for non-invasive optical imaging are provided. One or more time-lenses can be utilized to perform an optical Fourier transform, and the time-to-wavelength conversion can generate a wavelength-encoded image of optical scattering, analogous to optical coherence tomography. This optical Fourier transform provides improved axial resolution and simplifies digital signal processing after data acquisition.