Topic
Diffraction grating
About: Diffraction grating is a research topic. Over the lifetime, 24884 publications have been published within this topic receiving 372437 citations. The topic is also known as: grating.
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TL;DR: In this paper, a system is derived of differential equations which applies to two-dimensional periodic structures and can be solved by an extension of a technique suggested for the diffraction analysis of one-dimensional gratings, which is usually referred to as coupled-wave method.
86 citations
Patent•
31 Dec 1986TL;DR: The optical cavity of the present laser has a folded optical path with a pair of reflective diffraction gratings and a gain cell in it as discussed by the authors, and the laser output consists of a sequence of different wavelength but colinear rays.
Abstract: The optical cavity of the present laser has a folded optical path with a pair of reflective diffraction gratings and a gain cell in it. A disk with radially distributed perforations rotates in the optical path between the gratings and the gain cell. The laser wavelength depends upon which perforation is aligned with the slot in a slotted plate also in the optical path. The laser output consists of a sequence of different wavelength but colinear rays.
86 citations
TL;DR: In this paper, the development of interference (or 'holographic') techniques for manufacturing spectroscopic diffraction gratings, and the relationship between ruled gratings and those made interferometrically, are discussed.
Abstract: Recent progress in the techniques of manufacture of spectroscopic diffraction gratings is described. Three main topics are discussed in detail; (i) the mechanical ruling of gratings, and the way in which the mechanical aspects of the ruling process affect the spectroscopic performance of the grating; (ii) the development of interference (or 'holographic') techniques for manufacturing gratings, and the relationship between ruled gratings and those made interferometrically; (iii) X-ray gratings for use at grazing incidence, and the different criteria that arise through the use of gratings in this way. The review was completed in April 1975.
86 citations
TL;DR: In this article, the authors investigated the operation of a mode-locked fiber laser system for application in gas spectroscopy as a multipoint multigas sensor and reported a tuning rate of /spl sim/0.014 nm per kHz change in mode-lock frequency (at the third harmonic) has been demonstrated.
Abstract: This paper reports on an initial investigation into the operation of a mode-locked fiber laser system for application in gas spectroscopy as a multipoint multigas sensor. Wavelength selection is performed by use of multiple chirped gratings and fine tuning by using the dispersion properties of the chirped gratings. A tuning rate of /spl sim/0.014 nm per kHz change in mode-lock frequency (at the third harmonic) has been demonstrated, which is suitable for scanning across gas absorption lines. Key issues that have an important bearing on the tuning are discussed, including gain flattening and polarization drift. This paper investigates a method of multiplexing the sensor cells with the mode-locked system. Preliminary results for a two cavity system are presented to verify the principles of the technique.
86 citations
TL;DR: A Bragg grating in a photonic crystal fiber was written and its dependence with temperature and strain analyzed and the general properties of gratings in these fibers, and their implications, are enunciated.
Abstract: A Bragg grating in a photonic crystal fiber was written and its dependence with temperature and strain analyzed. The two observed Bragg wavelengths correspond to a fundamental and a higher-order mode in the optical fiber. The temperature and strain calibration curves for both modes are measured and found to be distinct. The general properties of gratings in these fibers, and their implications, are enunciated.
86 citations