OpenLoopStrehl

MATLAB

[Strehl,StrehlTR] = OpenLoopStrehl(r0,D,[Dobs],[method])

Description

Computes the Strehl ratio of a laser propagated through a turbulent medium. Returns the Strehl ratio for tilt-included, and the Strehl ratio for a tilt-removed beam (higher-order only).

Parameters

Parameters	Description
r0 [vector]	Atmospheric phase coherence length (Fried's parameter) (m)
D [vector]	Diameter of transmit aperture (m)
Dobs [vector]	(Optional) Diameter of transmitter central obscuration (m). Defaults to 0.
method [scalar]	(Optional) Method for computing Strehl, 0 for LUT (default) or 1 for analysis. Must specify Dobs (can be []) to specify method.

Return Values

Return Values	Description
Strehl [scalar]	Strehl ratio for tilt-included beam
StrehlTR [scalar]	Strehl ratio for tilt-removed beam (higher-order only)

References

Roggemann, M. C. and Welsh, B. M., "Imaging Through Turbulence," sec. 3.5.3, sec 3.5.4. (1996)