Journal ArticleDOI
Variable Metal Mesh Coupler for Far Infrared Lasers
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TLDR
In a far infrared molecular laser the traditional pierced output mirror has been replaced by an infrared interference filter, consisting of two metal mesh reflector grids, which allows convenient optimization of the coupling conditions of a laser for maximum power output.Abstract:
In a far infrared molecular laser the traditional pierced output mirror has been replaced by an infrared interference filter, consisting of two metal mesh reflector grids. By adjusting the spacing between the two parallel grids, the reflectance of the filter can be varied. Theory and experiment of this variable reflector are presented. It allows convenient optimization of the coupling conditions of a laser for maximum power output. In contrast to hole coupling, the interference filter provides uniform coupling over the entire cross section of the reflector. This reduces the diffraction losses and improves the angular distribution of the output beam. The variable reflector has also been used to determine the linear gain of the laser.read more
Citations
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Journal ArticleDOI
Simple formulas for transmission through periodic metal grids or plates
Abstract: A simple closed-form approximate solution is given for the transmission coefficient of a normally incident electromagnetic plane wave through a screen made of periodic metal grids (inductive screen), or made of metal plates (the complementary capacitive screen). Explicit formulas are also presented for cascading screens and dielectric slabs. When compared with the exact solution, our approximate simple formulas show good numerical accuracy.
Journal ArticleDOI
The waveguide laser - A review
TL;DR: In this article, the fundamental physical principles essential to an understanding of waveguide gas and liquid lasers, and the current technological state of these devices are discussed, as well as their applications and their current state of the art.
Journal ArticleDOI
Equivalent-circuit formulas for metal grid reflectors at a dielectric boundary.
TL;DR: This paper points out a number of errors that have appeared in the literature concerning transmission-line models for metal grid reflectors (strip gratings and meshes) especially in regard to the design of laser mirrors and filter elements for use at submillimeter wavelengths.
Journal ArticleDOI
Submillimeter waveguiding on periodic metal structure
R. Ulrich,M. Tacke +1 more
TL;DR: In this article, the magnetic radiation of 337μm wavelength has been guided in the form of TM surface waves along thin copper sheets perforated in a regular pattern (metal mesh).
Journal ArticleDOI
Infrared frequency selective surface based on circuit-analog square loop design
TL;DR: In this paper, a frequency selective surface (FSS) was designed to have a resonant spectral signature in the infrared, which is based on circuit-analog resonant behavior of square loop conducting elements.
References
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Journal ArticleDOI
Far-infrared properties of metallic mesh and its complementary structure
TL;DR: In this article, the optical properties of thin metallic mesh (inductive grids) are compared theoretically and experimentally with the properties of the complementary structure (capacitive grids) close interrelations are found in the non-diffraction region (wavelength > grid constant).
Journal ArticleDOI
Interference filters for the far infrared.
TL;DR: Perforated metal plates (grids) of various kinds are used for the construction of transmission filters for the far ir, and measurements at oblique incidence indicate that the filters will find useful application in light pipes too.
Journal ArticleDOI
Effective low-pass filters for far infrared frequencies
TL;DR: Capacitive grids are used to construct effective low-pass filters for the far infrared and sub-millimeter wave region as discussed by the authors, which are closely related to optical interference filters and to microwave filters of the lris-coupled resonator type.
Journal ArticleDOI
Metallic Mesh Bandpass Filters and Fabry-Perot Interferometer for the Far Infrared
TL;DR: In this article, the optical properties of thin electroformed metallic meshes were described in detail and two types of Fabry-Perot Interferometers (FPI's) for the far infrared were fabricated.