Abstract:
An optical coherence analysis system comprising: a first swept source that generates a first optical signal that is tuned over a first spectral scan band, a second swept source that generates a second optical signal that is tuned over a second spectral scan band, a combiner for combining the first optical signal and the second optical signal for form a combined optical signal, an interferometer for dividing the combined optical signal between a reference arm leading to a reference reflector and a sample arm leading to a sample, and a detector system for detecting an interference signal generated from the combined optical signal from the reference arm and from the sample arm. In embodiments, the swept sources are tunable lasers that have shared laser cavities.
Abstract:
A spectroscopy system comprises a tunable semiconductor laser, such as an external cavity laser, that generates a tunable signal. A detector is provided for detecting the tunable signal after interaction with a sample. In this way, the system is able to determine the spectroscopic response of the sample by tuning the laser of the scan band and monitoring the detector's response. An integrating device, such as an integrating sphere, is interposed optically between the tunable semiconductor laser and the detector. This integrating device is used to mitigate the effects of parasitic spectral noise, such as noise that is generated by speckle or the combination of single- and multi-mode optical fibers in the transmission link between the tunable semiconductor laser and the detector.
Abstract:
A spectrometer that provides the ability to combine the advantages of high resolution, compactness, ruggedness, and low-power consumption of Fabry-Perot (FP) tunable filter spectrometer, with the multi-channel multiplexing advantage of FT and/or grating/detector array. The key concept is to design and operate a tunable FP filter in a multiple-order condition. This filter is then followed by a "low-resolution" fixed grating, which disperses the filtered n-order signal into a preferably matched N-element detector array for parallel detection. The spectral resolution in this system is determined by the FP filter, which can be designed to have very high resolution. The N-order parallel detection scheme reduces the total integration or scan time by a factor of N to achieve the same signal to noise ratio (SNR) at the same resolution as the single channel tunable filter method.
Abstract:
An optical component manipulation system (100) has two opposed jaws (120A, 120B), which can each be independently positioned relative to each other in a coordinate plane to thereby effect the desired positioning of optical components (10) within the larger system. Z-axis rigidity is provided by air-bearings (124A, 124B). Laser heating (220) of the jaws is used for solder, or similar heat driven bonding, processes.
Abstract:
A MEMS tunable VCSEL includes a membrane device having a mirror and a distal-side electrostatic cavity for displacing the mirror to increase a size of an optical cavity. A VCSEL device includes an active region for amplifying light. Then, a proximal-side electrostatic cavity is defined between the VCSEL device and the membrane device is used to displace the mirror to decrease a size of an optical cavity.
Abstract:
An optical membrane device comprises a substrate, at least one support block on a surface of the substrate, and at least one plate. A torsion beam supports the plate above the substrate on the support block. The optical membrane device also includes an optical membrane structure supported by the plate above the substrate and at least one electrode on the substrate underneath the plate. In one implementation, the optical membrane device further comprises a tether for coupling the optical membrane structure to the plate. The tether extends between the optical membrane structure and the plate. In another implementation, the substrate of the optical membrane device has an optical port through the substrate directly below the optical membrane structure. The plate is substantially balanced around the torsion beam to minimize a sensitivity to orientation in a gravitational field.
Abstract:
An optical probe for emitting and/or receiving light within a body comprises an optical fiber that transmits and/or receives an optical signal, a silicon optical bench including a fiber groove running longitudinally that holds an optical fiber termination of the optical fiber and a reflecting surface that optically couples an endface of the optical fiber termination to a lateral side of the optical bench. The fiber groove is fabricated using silicon anisotropic etching techniques. Some examples use a housing around the optical bench that is fabricated using LIGA or other electroforming technology. A method for forming lens structure is also described that comprises forming a refractive lens in a first layer of a composite wafer material, such as SOI (silicon on insulator) wafers and forming an optical port through a backside of the composite wafer material along an optical axis of the refractive lens.
Abstract:
A frequency swept laser source for TEFD-OCT imaging includes an integrated clock subsystem on the optical bench with the laser source. The clock subsystem generates frequency clock signals as the optical signal is tuned over the scan band. Preferably the laser source further includes a cavity extender in its optical cavity between a tunable filter and gain medium to increase an optical distance between the tunable filter and the gain medium in order to control the location of laser intensity pattern noise. The laser also include a fiber stub that allows for control over the cavity length while also controlling birefringence in the cavity.
Abstract:
A multi semiconductor source tunable spectroscopy system has two or more semiconductor sources for generating tunable optical signals that are tunable over different spectral bands. The system enables the combination of these tunable signals to form an output signal that is tunable over a combined band including these individual spectral bands of the separate semiconductor sources. The system further compensates for spectral roll-off associated with the semiconductor sources. Specifically, near the limits of the semiconductor sources spectral bands, the power in the tunable signal tends to degrade or decrease. The system compensates for this roll-off using drive current control, attenuators, or electronic compensation.
Abstract:
A process for singulating MOEMS optical devices (10) from a precursor structure (110), in which the precursor structure (110) comprises device material (12), having movable optical structures (14), and handle material (22), through which optical ports (30) are formed to provide for optical access to the movable optical structures (14). The process comprises coating a frontside and a backside of the precursor structure (110) with protection material (610). The precursor structure (110) is then attached to a substrate such as dicing tape and the precursor structure (110) separated into individual optical devices (10) by a process, including die sawing. Thereafter, the optical devices (10) are removed from the tape and the protection material (610) removed from the optical devices (10).