Introduction to Adaptive Optics Book

	Preface	ix
Chapter 1	A long time ago, in a laboratory far, far, really far away	1
Chapter 2	Adaptive optics systems--optics is our middle name	19
	Physical/wave optics as it applies to adaptive optics	20
	Strehl ratio	22
Chapter 3	Speaking the language--a few definitions	25
	Power in the bucket	25
	Zernike polynomials	25
	Phase conjugation	29
	Imaging and MTF	30
Chapter 4	Atmospheric turbulence--bad air ... bad, bad air	33
	Structure constant	34
	Gaussian beams	36
	Fried's coherence length	36
	Scintillation	38
	Resolution and the halo	40
	Temporal effects: the Greenwood frequency	40
	Thermal blooming	41
	Anisoplanatism	42
Chapter 5	Laser guide stars--beacons in the wilderness	45
	Why we can't measure global tilt from a laser guide star	50
Chapter 6	Systems--putting it all together	53
	Configurations of adaptive optics systems	55
Chapter 7	Wavefront sensors--the eyes	63
	Measuring tilt	64
	The quadcell	64
	Measuring focus	66
	Interferometers	67
	The principle of the shearing interferometer	71
	Hartmann sensors	71
	Curvature sensing	74
	Image sharpening	75
	Wavefront sensor requirements	76
	Detectors	76
	Beamsplitters and samplers	77
Chapter 8	Deformable mirrors--the hands	81
	Types of deformable mirrors	81
	Tilt mirrors	82
	Deformable mirrors	83
	Deformable mirror requirements	87
	Bimorph deformable mirrors	89
	Micromachined deformable mirrors	90
Chapter 9	Control computers and reconstructors--the brains	93
	Single-channel servo control	93
	Single-channel dynamic control	95
	Bandwidth limitations	98
	Phase reconstruction	99
	Example problem: actuator commands from wavefront slopes	105
	Epilogue	111
	Figure credits	113
	Index	115