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Journals and Conferences
An optically pumped mid-infrared edge-emitting laser is described, in which a Distributed Bragg Reflector grating partially occupies the surface, and provides spectral narrowing in a high power device. A quasi-continuous-wave power of 3 Watts is obtained at 3.6 µm that is contained within a spectral width of 7 nm.
We develop a method for subaperture piston phase retrieval in a telescope using a segmented primary mirror. We assume that the mirror subapertures are arranged on a two-dimensional lattice, and in addition, the separate subaperture point-spread functions are focused and overlapped on the focal plane. Therefore, the residual errors are the subaperture piston… (More)
Abstract: We will examine the waveguide mode losses in ridge-guided quantum cascade lasers. Our analysis illustrates how the low-loss mode for broad-ridge quantum cascade lasers (QCLs) can be a higher-order lateral waveguide mode that maximizes the feedback from the sloped ridge-wall regions. The results are in excellent agreement with the nearand far-field… (More)
An optically pumped in-plane DBR mid-infrared laser is described. A quasi continuous-wave power of ∼2.8 Watts is obtained at ∼3.59 μm that is contained within a spectral width of ∼5 nm.
An analytic solution for the bare cavity eigenmodes of a nonsymmetric self-filtering unstable resonator is obtained by a modal expansion in prolate functions, which is a complete and orthogonal set of eigenmodes for a symmetric confocal stable resonator. An accurate representation within the aperture is shown to require only three terms. An efficient use of… (More)
The linear and circular prolate functions are basis sets for the bare cavity eigenmodes of stable and unstable laser resonators having rectangular or circular symmetry. Early calculations of these functions used power series expansions. A matrix technique which was first used by Sanderson and Streifer is used here to demonstrate rapid and accurate numerical… (More)
We will develop a general theory of laser resonators based on an analysis of optimized regenerative optical amplifiers. In particular, we demonstrate that a description of the circulating field in the regenerative amplifier should not be decoupled from the injected field description. Specifically, we solve the following problem: for a given wavelength and… (More)
We develop a method for analyzing the lateral modes of broad-ridge quantum cascade lasers (QCLs) that incorporate an intracavity lateral constriction. The calculations provide results that are in good agreement with the recent data taken on broad-ridge QCLs that incorporate such lateral constrictions. We conclude by providing design principles for… (More)
We describe a class of laser resonator, incorporating a feedback collimator (FBC), that provides feedback that is mode-matched onto a higher-order lateral mode of a slab waveguide laser. In addition, this same resonator, in outcoupling, converts the stabilized higher-order lateral mode into an essentially laterally collimated output beam with a width that… (More)
We will compare speckle imaging reconstruction results for several speckle imaging approaches. 1 In particular, we will compare and contrast four methods: 1) Knox-Thompson, using a hidden phase-finder in the object spectrum phase reconstruction; 2,3 2) Knox-Thompson, using a phasor-based phase reconstruction; 3) Bispectrum, using only two bispectrum planes;… (More)