In one embodiment of the invention, a semiconductor optical amplifier (SOA) in a laser ring is chosen to provide low polarization-dependent gain (PDG) and a booster semiconductor optical amplifier, outside of the ring, is chosen to provide high polarization-dependent gain. The use of a semiconductor optical amplifier with low polarization-dependent gain nearly eliminates variations in the polarization state of the light at the output of the laser, but does not eliminate the intra-sweep variations in the polarization state at the output of the laser, which can degrade the performance of the SS-OCT system.

An integrated optical system includes a photonic integrated circuit (PIC) having a frequency tunable optical source, a coherent optical receiver, and an optical phased array for coupling light to/from a sample. The integrated optical system is configured such that when the optical source is tuned in optical frequency the receiver produces electrical signals that are processed to produce optical profile information about the sample.

The disclosed automatic calibration systems and methods provide a repeatable way to detect internal catheter reflections and to shift the internal catheter reflections to calibrate an image.

Disclosed are systems and methods to extract information about the size and shape of an object by observing variations of the radiation pattern caused by illuminating the object with coherent radiation sources and changing the wavelengths of the source. Sensing and image-reconstruction systems and methods are described for recovering the image of an object utilizing projected and transparent reference points and radiation sources such as tunable lasers. Sensing and image-reconstruction systems and methods are also described for rapid sensing of such radiation patterns. A computational system and method is also described for sensing and reconstructing the image from its autocorrelation. This computational approach uses the fact that the autocorrelation is the weighted sum of shifted copies of an image, where the shifts are obtained by sequentially placing each individual scattering cell of the object at the origin of the autocorrelation space.

An optical-coherence-tomography apparatus includes a light-source unit configured to emit light while changing a wavelength of the light; an optical interferometric system configured to split the light from the light-source unit into illuminating light to be applied to an object and reference light, and to generate interfering light from the illuminating light reflected by the object and the reference light; a photodetection unit configured to receive the interfering light, and an information-acquiring unit configured to acquire information on the object from the interfering light received by the photodetection unit. The light-source unit performs wavelength sweep by displacing a movable portion with an electrostatic force generated with the application of a voltage. The optical-coherence-tomography apparatus further includes a pull-in-detection unit configured to detect whether or not a pull-in effect is occurring on the movable portion of the light-source unit.

The disclosed automatic calibration systems and methods provide a repeatable way to detect internal catheter reflections and to shift the internal catheter reflections to calibrate an image.

Provided is an optical tomographic device for simultaneously acquiring a plurality of tomographic images at a same position in a subject without narrowing a depthwise measurement range. A measurement light generator generates at least two measurement lights with different optical path lengths, superimposes the at least two measurement lights, radiates the resultant light to a subject, and splits reflected light reflected from the subject into at least two reflected lights. A reference light generator generates at least two reference lights with different optical path lengths. An interfering light generator combines the at least two reflected lights and the at least two reference lights having corresponding different optical path lengths, to generate at least two interfering lights. An interfering light detector detects the at least two interfering lights independently by at least two interfering light detectors.

During one or more active periods of time over which at least one of an amplitude, frequency, or phase of one or more optical wave(s) are modified, the optical wave(s) overlap with and interact with a gaseous cloud of IAMs and transfer portions of the among different distributions of momentum states. Control signals for controlling aspects of the optical wave(s) are determined based at least in part on (1) a constraint determined based at least in part on a set of optical wave parameters, and a set of quantum state parameters, where two or more of the quantum state parameters do not satisfy the constraint, and/or (2) a partial derivative of one or more quantum states associated with the IAMs, where the partial derivative is with respect to an optimization parameter determined based at least in part on the one or more optical waves or the estimation parameter.

Disclosed are systems and methods to extract information about the size and shape of an object by observing variations of the radiation pattern caused by illuminating the object with coherent radiation sources and changing the wavelengths of the source. Sensing and image-reconstruction systems and methods are described for recovering the image of an object utilizing projected and transparent reference points and radiation sources such as tunable lasers. Sensing and image-reconstruction systems and methods are also described for rapid sensing of such radiation patterns. A computational system and method is also described for sensing and reconstructing the image from its autocorrelation. This computational approach uses the fact that the autocorrelation is the weighted sum of shifted copies of an image, where the shifts are obtained by sequentially placing each individual scattering cell of the object at the origin of the autocorrelation space.

A sample clock generator includes a first optical path and a second optical path through which input lights are guided, an optical phase shifter to shift a phase of the input light guided through the first optical path, an interference-light generating unit to combine a phase-shifted input light and the input light guided through the second optical path to thereby generate an interference light for sample clock, a splitting unit to split the interference light for sample clock into two split lights having different phases, one light receiving unit to at least receive one split light from among the two split lights having different phases, the other light receiving unit to at least receive the other split light, a signal generating unit to generate a sample clock signal based on signals outputted from the one light receiving unit and the other light receiving unit.