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On-chip reconfigurable optical add-drop multiplexer for hybrid wavelength/mode-division-multiplexing systems
10.1364/OL.42.002802 2017-07-13 A silicon-based on-chip reconfigurable optical add-drop multiplexer (ROADM) is presented for hybrid wavelength-division-multiplexing–mode-division-multiplexing systems. The present ROADM consists of a four-channel mode demultiplexer, four wavelength-selective... |
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High-average-power femtosecond laser at 258 nm
10.1364/OL.42.002826 2017-07-13 We present an ultrafast fiber laser system delivering 4.6 W average power at 258 nm based on two-stage fourth-harmonic generation in beta barium borate (BBO). The beam quality is close to being diffraction limited with an M2 value of 1.3×1.6. The pulse durati... |
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Topology optimization of multi-track ring resonators and 2D microcavities for nonlinear frequency conversion
10.1364/OL.42.002818 2017-07-13 We exploit recently developed topology-optimization techniques to design complex, wavelength-scale resonators for enhancing various nonlinear χ(2) and χ(3) frequency conversion processes. In particular, we demonstrate aperiodic, multi-track ring resonators an... |
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Multiple-view diffuse optical tomography system based on time-domain compressive measurements
10.1364/OL.42.002822 2017-07-13 Compressive sensing is a powerful tool to efficiently acquire and reconstruct an image even in diffuse optical tomography (DOT) applications. In this work, a time-resolved DOT system based on structured light illumination, compressive detection, and multiple ... |
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4D spatiotemporal evolution of combustion intermediates in turbulent flames using burst-mode volumetric laser-induced fluorescence
10.1364/OL.42.002830 2017-07-13 High-speed (20 kHz rate), volumetric laser-induced-fluorescence imaging of combustion intermediates such as a formaldehyde (CH2O) and polycyclic aromatic hydrocarbon (PAH) species is demonstrated for tracking the four-dimensional (4D) evolution of turbulent f... |
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Multiple-view diffuse optical tomography system based on time-domain compressive measurements
10.1364/OL.42.002822 2017-07-13 Compressive sensing is a powerful tool to efficiently acquire and reconstruct an image even in diffuse optical tomography (DOT) applications. In this work, a time-resolved DOT system based on structured light illumination, compressive detection, and multiple ... |
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4D spatiotemporal evolution of combustion intermediates in turbulent flames using burst-mode volumetric laser-induced fluorescence
10.1364/OL.42.002830 2017-07-13 High-speed (20 kHz rate), volumetric laser-induced-fluorescence imaging of combustion intermediates such as a formaldehyde (CH2O) and polycyclic aromatic hydrocarbon (PAH) species is demonstrated for tracking the four-dimensional (4D) evolution of turbulent f... |
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Lens-free all-fiber probe with an optimized output beam for optical coherence tomography
10.1364/OL.42.002814 2017-07-13 A high-efficiency lensless all-fiber probe for optical coherence tomography (OCT) is presented. The probe is composed of a segment of large-core multimode fiber (MMF), a segment of tapered MMF, and a length of single-mode fiber (SMF). A controllable output be... |
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Versatile backconversion-inhibited broadband optical parametric amplification based on an idler-separated QPM configuration
10.1364/OL.42.002806 2017-07-13 Conversion efficiency and phase-matching (PM) bandwidth are both critical issues for broadband parametric processes. In some sense, they determine the highest peak power achieved via the optical parametric amplification. In this Letter, a versatile idler-sepa... |
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Topology optimization of multi-track ring resonators and 2D microcavities for nonlinear frequency conversion
10.1364/OL.42.002818 2017-07-13 We exploit recently developed topology-optimization techniques to design complex, wavelength-scale resonators for enhancing various nonlinear χ(2) and χ(3) frequency conversion processes. In particular, we demonstrate aperiodic, multi-track ring resonators an... |