Abstract:
PROBLEM TO BE SOLVED: To solve the problem wherein a plurality of etalon filters are required and the number of adjustment working hours is increased, to detect a minute change in an LD output wavelength in a wide wavelength range, since characteristics in the etalon filters are periodic, even though the etalon filter is usually used to detect the minute change in the LD output wavelength in an LD module, having a built-in wavelength locker. SOLUTION: The output light of an LD element 10 is changed to two different polarization states by a polarization switching element 5, and by setting transmission characteristics in a filter 31A to be different characteristics by the polarization state, variations in the output wavelength of the LD element 10 are detected over a wide wavelength range. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a polarimetric device having one or more of modulation of polarized light without using a mechanical moving member, providing of a sufficiently extensive acceptable angle in an application to image formation, a simple and compact design including optimization for error propagation, and rapid data acquisition of real-time measurement. SOLUTION: This device comprises a polarization state generator 4 including a polarizer 5 for linearly polarizing an incident light beam 2 along the polarization direction in an exciting area 1 for emitting optical beam, a polarization state detector 8 including an analyzer 9 and a detection means 10, and a processing device 11. The polarization state generator 4 (PSG) and the polarization state detector 8 (SPD) each has a first and a second liquid crystal elements 13 and 14. Each LCj element 13 of the PSG has an extraordinary axis making an angle θj with respect to the polarization direction, and a phase retardation δj between its ordinary and extraordinary axes. Each liquid crystal element 14 is positioned in reverse order in the PSG with respect to each LCj element of the PSG, with θ'j equal to θj, and a retardation δ'j equal to -δj. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PURPOSE:To obtain a measuring apparatus containing no mechanically moving part which enable continuous decision with an excellent durability, by dividing a linearly polarized light transmitting with a sample into two polarization components to calculate the optical rotary power of the sample from he relationship of intensity between the two polarization components. CONSTITUTION:When the sample cell 4 is empty or the sample has no optical rotary power, a light detecting element 5 is so arranged that the linearly polarized light from a light source 1 passing through a polarizer 2 is separated into two polarization components equal to each other in the direction at + or -45 deg. to the polarizing direction of the original polarized light. Then, when the sample has any optical rotary power, the linearly polarized light passing through the sample cell 4 turns somewhat from the polarizing direction of the polarizer 2. Then, the rotary angle alpha can be calculated from a specified formula by utilizing the polarization components divided in two directions with the light detecting element 5. In other words, two luminous fluxes received by light receiving elements 71 and 72 are inputted into an arithmetic unit 12 via a preamplifiers 10 and 11 and the unit 12 performs computation by the specified formula to calculate the rotary angle alpha. The results of the computation are sent to a display 13 for indication.
Abstract:
A characterization and detection method and system, the system comprising a terahertz beam source, a probe beam source, a detection crystal receiving a probe beam from the probe beam source and a terahertz beam from the terahertz beam source, the probe beam and the terahertz beam co-propagating collinearly through the detection crystal, and a polarizer analyser receiving the pump beam transmitted from the detection crystal, wherein the polarizer analyser comprises two liquid crystal variable retarders and a linear polarizer, the polarizer analyzer analyzing a phase delay and orientation changes of the principle axes of the probe beam induced by the THz electric field and polarization.
Abstract:
Methods and apparatus for characterizing a beam parameter associated with an electromagnetic beam of a light source. The light source exposes a phase-shifted target through a set of focal distances relative to a focal plane of a substrate. At each focal distance of the set, registration values are measured and used to determine one or more registration slopes as a function of focal distance. The registration slopes are compared with baseline registration slopes to characterize the current relative state of the beam parameter in question. Beam parameters that may be characterized in this manner include degree of polarization and polarization rotation relative to an initial polarization direction. Phase shift test patterns advantageously used for beam characterization are described.
Abstract:
An imaging device and method are provided. Light from an object is provided as a plurality of sets of light beams to a phase difference array having a plurality of elements. The phase difference array is configured to provide different optical paths for light included within at least some of a plurality of sets of light beams. The light from the phase difference array is received at an imaging element array. The imaging element array includes a plurality of imaging elements. Information obtained from hyperspectral imaging data based on output signals of the imaging element array can be displayed.