Page 37 - Tunable Lasers Handbook

18 F.J. Duarte

a 1

Screen Axial Distance (meters) x 1 0-3

b -
50.0-

40.0-
x
._
c
(I]
c - 30.0-
a,
._
-
+d
2 20.0-
10.0-

Screen Axial Distance (meters) x 10-3
FIGURE 5 Transverse-mode structures for Fresnel numbers of (a) 0.86 and (b) 0.25, at h = 580
nm. (Reprinted with permission from Duarte [37] and Elsevier Science.)

should be minimized and (a€)/&) should be maximized. Certainly, the main two
functions of the intracavity optics is to yield near-diffraction-limited beams and
very high dispersion with maximum transmission efficiency.
Equation (6) can be considered as a purely mathematical statement (see
Chapter 6, for example), although physicists working in areas of classical optics