Page 10 - High Power Laser Handbook

Co n t e n t s ix

9.1.2 TZ-2 Module Development . . . . . . . 211
9.1.3 TZ-3 Module Development . . . . . . . 216
9.1.4 Coupling Three TZ-3 Modules . . . . . 217
9.2 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
10 Thin-Disc Lasers Adolf Giesen, Jochen Speiser . . . . 225
10.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
10.2 History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
10.3 Principles of Thin-Disc Lasers . . . . . . . . . . . . 226
10.4 Possible Laser Materials . . . . . . . . . . . . . . . . . 229
10.5 Numerical Modeling and Scaling . . . . . . . . . 230
10.5.1 Average Temperature . . . . . . . . . . . . 230
10.5.2 Influence of Fluorescence . . . . . . . . . 232

10.5.3 Thermally Induced Stress . . . . . . . . . 234
10.5.4 Deformation, Stress, and Thermal
Lensing . . . . . . . . . . . . . . . . . . . . . . . . 235
10.5.5 Design Study for High-Power
Thin-Disc Lasers . . . . . . . . . . . . . . . . . 238
10.5.6 Numerical Modeling of Gain
and Excitation . . . . . . . . . . . . . . . . . . . 239
10.5.7 Equation of Motion . . . . . . . . . . . . . . 240
10.5.8 Coupled Quasi-Static Numerical
Model . . . . . . . . . . . . . . . . . . . . . . . . . . 241

10.5.9 Influence of ASE . . . . . . . . . . . . . . . . . 242
10.5.10 Interaction of ASE and Excitation . . . 243
10.5.11 Time Resolved Numerical Model . . . 245
10.5.12 ASE-Limit . . . . . . . . . . . . . . . . . . . . . . 248
10.6 Thin-Disc Laser in Continuous-Wave
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
10.6.1 High Average Power . . . . . . . . . . . . . 250
10.6.2 Fundamental Mode, Single
Frequency and Second Harmonic
Generation (SHG) . . . . . . . . . . . . . . . . 251
10.7 Thin-Disc Laser in Pulsed Operation . . . . . . 254
10.7.1 Q-Switched Operation of the
Thin-Disc Laser . . . . . . . . . . . . . . . . . . 255
10.7.2 Cavity-Dumped Operation of the
Thin-Disc Laser . . . . . . . . . . . . . . . . . . 256

10.7.3 Amplification of Nanosecond,
Picosecond, and Femtosecond
Pulses . . . . . . . . . . . . . . . . . . . . . . . . . . 257
10.7.4 High Pulse Energy Thin-Disc Lasers . . . 259
10.8 Industrial Realizations . . . . . . . . . . . . . . . . . . . 261