Page 283 - High Power Laser Handbook

252 So l i d - S t at e La s e r s Thin-Disc Lasers 253

Figure 10.19 Artist’s view of a setup for combining four discs in one
resonator.
3.5 60

3.0
50
2.5 40
Output power (kW) 2.0 30 Optical efficiency (%)

1.5

1.0 20

10
0.5
0.0 0
0 1 2 3 4 5 6 7
Pump power (kW)
Figure 10.20 Output power and optical efficiency with 4 discs, beam quality
M² ≈ 6.
relationship between pump spot and fundamental mode is an opti-
mization that concerns phase distortions and mode overlap. In
Fig. 10.8, the intensity distribution of a fundamental mode with a
mode diameter that is 70 percent of the pump spot diameter is
sketched. Inside the pump spot, the remaining phase distortions are
smaller than 400 nm and inside the mode diameter even less than