Two other methods of phase matching avoid beam walk-off by forcing all frequencies to propagate at a 90?with respect to the optical axis of the crystal.
42.
Without loss of generality, we will define the optical axis so that it coincides with the " z "-axis of a fixed coordinate system.
43.
The plane of the optical axis is normal to the plane of symmetry and inclined 160, rear to the normal to ( 0, 0, 1 ).
44.
Only the beam propagating on the optical axis, proportional to the cross-product E ( t ) E ( t-\ tau ), is retained.
45.
In optics, image / optical distortion is a divergence from rectilinear projection caused by a change in magnification with increasing distance from the optical axis of an optical system.
46.
When looking at a point that is not perfectly aligned with the optical axis, some of the incoming light from that point will strike the mirror at an angle.
47.
This configuration utilizes a two-axis feed flat mirror to reflect starlight into a fixed paraboloid of revolution ( paraboloidal ) mirror, usually with a horizontal optical axis.
48.
A second ray can be drawn from the top of the object passing through the focal point and reflecting off the mirror at a point somewhere below the optical axis.
49.
Note that " H'1 " should rotate the second image's optical axis to be parallel with the transformed optical axis of the first image.
50.
Note that " H'1 " should rotate the second image's optical axis to be parallel with the transformed optical axis of the first image.
