For greater control over environmental conditions or to reduce operating costs, use of a simulator is now a standard technique. To compare the optical performance of a telescopic sight and its simulator the mtf curves were measured under operating conditions. Although simple in concept great care must be taken in obtaining and interpreting the results. This paper describes the conditions of measurement and discusses factors which could invalidate the results.
Tranverse mode selection increases the brightness of solid-state lasers-useful in plasma generation, microcircuit machining, drilling and nonlinear optics. This article enumerates advantages of transverse mode selection and gives the background to modes and resonators. Using mode selection solid-state lasers may become reliable with good repeatability of performance, removing their most serious drawbacks. Part 2 explains the basis of mode selection using the plano-concave resonator as an example and discusses a wide variety of resonators. Unstable resonators show particular promise for mode selection.
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