Page 8 - High Power Laser Handbook

Co n t e n t s vii

5.3 High-Power Laser Diode Attributes . . . . . . . 103
5.4 Device Geometry and Wafer Fabrication
Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

5.5 Vertical and Lateral Confinement Laser Diode
Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

5.6 Efficiency of Laser Diodes . . . . . . . . . . . . . . . . 108
5.7 High-Power Broad-Area Laser Diodes . . . . . 110
5.8 High-Power Bars . . . . . . . . . . . . . . . . . . . . . . . 112
5.9 High-Power, Single-Mode Laser Diodes . . . 114
5.10 Burn-In and Reliability of Laser Diodes . . . . 116
5.11 Submount Design and Assembly . . . . . . . . . 120
5.12 Fiber-Coupled Package Design
and Processes . . . . . . . . . . . . . . . . . . . . . . . . . . 122
5.13 Performance Attributes . . . . . . . . . . . . . . . . . . 125
5.14 Spatially Multiplexed High-Brightness
Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

5.15 Qualification and Reliability . . . . . . . . . . . . . . 127
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
6 High-Power Diode Laser Arrays
Hans-Georg Treusch, Rajiv Pandey . . . . . . . . . . . . . . . . 133
6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
6.2 Diode Laser Bar Assembly . . . . . . . . . . . . . . . 134
6.3 Heat Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 136
6.3.1 Water Guidelines for Minichannel
Heat Sinks . . . . . . . . . . . . . . . . . . . . . . 137
6.3.2 Expansion-Matched Microchannel
Heat Sinks . . . . . . . . . . . . . . . . . . . . . . 138
6.4 Product Platforms . . . . . . . . . . . . . . . . . . . . . . 139
6.5 Device Performance . . . . . . . . . . . . . . . . . . . . . 141
6.5.1 Wavelength, Power, Effi ciency, and
Mode of Operation . . . . . . . . . . . . . . . 141
6.5.2 Beam Quality and Brightness . . . . . . 141
6.5.3 Wavelength Locking . . . . . . . . . . . . . 142
6.5.4 Lifetime and Reliability . . . . . . . . . . . 144
6.6 Product Performance . . . . . . . . . . . . . . . . . . . . 145
6.6.1 Fiber Coupling of Individual
Diode Bars . . . . . . . . . . . . . . . . . . . . . . 146
6.6.2 Power Scaling . . . . . . . . . . . . . . . . . . . 150
6.6.3 Fiber-Coupled High-Power
Diode Laser Devices . . . . . . . . . . . . . 151
6.7 Direct High-Power Diode Array
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
6.7.1 Industrial Applications . . . . . . . . . . . 153
6.7.2 Medical Applications . . . . . . . . . . . . . 158
6.7.3 Defense Applications . . . . . . . . . . . . . 158
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159