Laser processing methods based on projection of amplified images provide significant benefits compared to scanning based methods in applications with variable high resolution information. Using the Texas Instrument Digital Micromirror Device (DMD) as a Variable Mask, an image amplification architecture is presented that provides pulse energies (50 ~ 250mJ) and peak powers necessary to process large areas (several cm2 ) with variable high resolution information. The seed lasers and the amplifiers used in the architecture are pulsed Nd:YAG systems.
KEYWORDS: Digital filtering, Analog electronics, Single mode fibers, Tunable filters, Linear filtering, Filtering (signal processing), Electronic filtering, Acousto-optics, Optical filters, Signal processing
Electronically programmable, broadband analog Radio Frequency (RF) transversal filter architecture is proposed and
implemented using an Acousto-Optic Tunable Filter and a Chirped Fiber Bragg Grating. Proof-of-concept filter two-tap
notch filters are demonstrated with a tunable range of 2-8 GHz and notch depth of 35 dB.
To the best of our knowledge, proposed is the first extreme-environment wireless pressure sensor design using a remoted single-crystal SiC chip within a pressurized capsule. A detailed theoretical analysis of the sensor system is performed, including the SiC chip's mechanical response within the pressure capsule and the pressure measurement technique's optical response based on image demagnification. The remote sensor was experimentally tested at room temperature for pressures up to 41 atm, and the sensor response is consistent with the theoretical analysis. The demonstrated sensor has a current experimental resolution of 1.17 atm with a designed maximum pressure range of 140 atm. Improved sensing resolution and range can be achieved via optimal selection of the SiC chip's dimensions and its seating in the pressure capsule. Applications for this sensor include extreme environments involving hot gases and corrosive fluids, as in power generation systems, oil field operations, and aerospace systems.
Propose here unique wavelength and hybrid wavelength-polarization and wavelength-polarization-time-multiplexed heterodyne optical interferometers using an internal self-referencing scheme enabling Angstrom level sensitivity optical path-length measurements. As a first step, a proof-of-concept wavelength multiplexed scanning heterodyne interferometer is built to test the surface quality of a test mirror, demonstrating ±100 Å profile variations with a 0.9 Å accuracy. The hybrid wavelength-polarization and wavelength-polarization-time-multiplexed interferometers can be used to form spectrally coded distributed sensors.
Proposed, to the best of our knowledge, is the first extreme environment wireless all-in-one hybrid temperature plus pressure sensor using a remoted thick single crystal Silicon Carbide chip within a pressurized capsule. Analysis and experiments are reported for the pressure aspect of the sensor for pressures up to 40 atms.
KEYWORDS: Signal attenuation, Micromirrors, Analog electronics, Fiber optics, Digital micromirror devices, Microelectromechanical systems, Variable optical attenuators, Single mode fibers, High dynamic range imaging, Biosensing
Fiber-optic variable optical attenuators (VOAs) are required for light power control in numerous applications such as test and instrumentation, optical fiber telecommunications, industrial fiber-optic sensing, biomedical imaging and sensing, and photonic signal processing for antennas and radar systems. The requirements for the VOA, such as dynamic range and resolution, vary depending on the application. A VOA can demonstrate high end performance when it possesses critical attributes like super resolution precision and high dynamic range. Reported in this paper is the demonstration of a hybrid analog-digital fiber-optic VOA design that employs microelectromechanical systems (MEMS) technology. The VOA demonstrates simultaneously a super high controlled dynamic range of 81 dB as well as super 0.1 dB resolution attenuation controls. Proof-of-concept experiments exhibit an optical loss of 2.5 dB and C-band operations.
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