Coherent Optics - Fundamentals and Applns by W. Lauterborn, T. Kurz

By W. Lauterborn, T. Kurz

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The isoplanatic angle is the angle where the wavefront error between the beacon path and the science path differs by 1 radian, or about 1/6 of a wave. The edge of the isoplanatic “patch” does not have a sharp cutoff but rolls off gradually. Field Guide to Adaptive Optics, 2nd Ed. 46 Deformable Mirrors Subsystem Requirements: Tilt Mirror The amount of wavefront tilt is dependent on the diameter of the full aperture D . 184 D 5/3 λ 2 r0 D A tilt-corrector mirror is usually in a compact part of the beam train.

However, when funding agencies were presented with the proposal, it was realized that the concept was already a few years old. S. Air Force, Navy, and numerous defense contractors. With the collapse of the Soviet Union in 1991, much of the research was declassified and available to astronomers worldwide. Field Guide to Adaptive Optics, 2nd Ed. Deformable Mirrors 41 Focal Anisoplanatism (the “Cone Effect”) When an object in the sky is too dim to make wavefront sensor measurements and no bright object is within the isoplanatic angle of the object of interest, artificial laser guide stars can be produced.

Beam quality is a unitless ratio and is often referred to as “times diffraction limit” because the spot size in the farfield is M 2 times larger than that of the diffractionlimited beam. Laser brightness is inversely proportional to the square of the beam quality for a given power level: B∝ 1 M2 2 Power in the bucket (PIB) is also commonly used to describe laser performance. In this case, the measured output is integrated over a defined aperture or “bucket” that represents the desired collection area.

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