Page 268 - High Power Laser Handbook

236 So l i d - S t at e La s e r s Thin-Disc Lasers 237

30

20
OPD (µm)

Deformation of HR
10 Thickness and dn/dT
OPD

0
0 2 4 6 8 10 12 14
r (mm)
Figure 10.7 Contributions to the optical phase distortion OPD for a Yb:YAG
thin-disc of thickness 150 µm, mounted on a CuW heat sink with thickness
of 1 mm, pump spot radius 7.5 mm, and heat source per area 5.4 W/mm²,
equivalent to 60 W/mm² absorbed power density.

0

Phase distortion ∆Φ (µm) −1

−2

−3

−4
0 2 4 6 8 10
r pump
Radius (mm)
Figure 10.8 Aspherical part of the phase distortion of a Yb:YAG thin-disc of
thickness 150 µm, mounted on a CuW heat sink with thickness of 1 mm,
pump spot radius r 7.5 mm, and heat source per area 5.4 W/mm².
pump