Lasers ♦ industry news
within the CMOS-processing infrastructure is key to realizing the potential of silicon photonics,” said Laurent Fulbert, photonics programs manager at Leti and coordinator of HELIOS. “The HELIOS partners are focused on bringing this technology to foundries and component manufacturers for high- volume applications.”
In addition to the laser and silicon modulator, building blocks under development by the HELIOS partners include a light modulator, passive waveguides and photodetectors.
Other recent results of the project include:
•Demonstration of high responsivity (0.8-1A/W), low dark current and high BW photodiodes (up to 130 GHz)
•Efficient passive waveguides (Mux/Demux, polarization diversity circuit, fiber coupling, rib/strip transition)
•Establishment of a photonics design flow •Investigation of novel concepts for light emission and modulation
Most of the results of the second year have been presented at the IEEE Group Four Photonics Conference in Beijing.
The HELIOS consortium also developed a training course addressing all aspects of silicon photonics. This free, 21-hour course is available on HELIOS website:
http://www.helios-project.eu/Download/ Silicon-photonics-course
In addition to Leti, the HELIOS partners are: - imec (Belgium) - CNRS (France) - Alcatel Thales III-V lab (France) - University of Surrey (UK) - IMM (Italy) - University of Paris-Sud (France) - Technical University of Valencia (Spain) - University of Trento (Italy) - University of Barcelona (Spain) - 3S Photonics (France) - IHP (Germany) - Berlin University of Technology (Germany) - Thales (France) - DAS Photonics (Spain) - Austriamicrosystems AG (Austria) - Technical University of Vienna (Austria) - Phoenix BV (Netherlands) - Photline Technologies (France)
The HELIOS Project website address is www.
helios-project.eu/
Soraa builds the brightest blue lasers
Soraa has fabricated blue lasers delivering more than 800 mW and green variants producing more than 60 mW.
University of California, Santa Barbara, spin-off Soraa claims to have broken the output power and efficiency records for blue laser diodes.
The west coast start-up, which is based in Goleta, California, has produced a 447 nm edge-emitting laser with a 900 micron cavity that delivers an output above 800 mW, and a shorter version with a 600 micron cavity that has a peak wall plug efficiency (WPE) of 23.2 percent.
In addition, the company has made a 521 nm laser that delivers more than 60 mW and produces a WPE in excess of 1.9 percent.
All the green and blue lasers have been built on undisclosed, non c-plane orientations of GaN using conventional semiconductor processing technology for this wide bandgap material. The devices were 1.5- 2.5 microns wide and featured a surface ridge laser architecture designed for single lateral mode operation.
Soraa’s most powerful blue laser had a threshold current and voltage of 45 mA and 3.8V. Slope efficiency was 1.55 W/A at a case temperature of 20 degrees C. The shorter variant had a threshold current and voltage of 30 mA and 3.8V, a slope efficiency of 1.68 W/, and a WPE of 23.2 percent at a laser output of 180 mW.
At an output of 100 mW, the efficiency of these laser chips are about 40 percent higher than those reported by Osram Opto Semiconductors at this year’s Photonics West meeting. Soraa says that this highlights the attractiveness of non c-plane lasers for applications requiring high efficiency, such as next generation displays.
Reliability testing of five blue lasers revealed a mean lifetime of 10,000 hours. These tests used automatic power control to start driving lasers at 60 mW and the time it took for the output power to fall by 20 percent was recorded.
The green lasers produced by the start up had a 600 micron cavity, a threshold voltage and current
94
www.compoundsemiconductor.net November/December 2010
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129 |
Page 130 |
Page 131 |
Page 132 |
Page 133 |
Page 134 |
Page 135 |
Page 136 |
Page 137 |
Page 138 |
Page 139 |
Page 140 |
Page 141 |
Page 142 |
Page 143 |
Page 144 |
Page 145 |
Page 146 |
Page 147 |
Page 148 |
Page 149 |
Page 150 |
Page 151 |
Page 152 |
Page 153 |
Page 154 |
Page 155 |
Page 156 |
Page 157 |
Page 158 |
Page 159 |
Page 160 |
Page 161 |
Page 162 |
Page 163 |
Page 164 |
Page 165 |
Page 166 |
Page 167 |
Page 168 |
Page 169 |
Page 170 |
Page 171 |
Page 172 |
Page 173 |
Page 174 |
Page 175 |
Page 176 |
Page 177 |
Page 178 |
Page 179 |
Page 180 |
Page 181 |
Page 182 |
Page 183 |
Page 184 |
Page 185 |
Page 186 |
Page 187 |
Page 188 |
Page 189 |
Page 190 |
Page 191 |
Page 192 |
Page 193 |
Page 194 |
Page 195 |
Page 196 |
Page 197 |
Page 198 |
Page 199 |
Page 200 |
Page 201 |
Page 202 |
Page 203 |
Page 204 |
Page 205 |
Page 206 |
Page 207 |
Page 208 |
Page 209 |
Page 210 |
Page 211 |
Page 212 |
Page 213 |
Page 214 |
Page 215 |
Page 216 |
Page 217 |
Page 218 |
Page 219 |
Page 220 |
Page 221 |
Page 222 |
Page 223 |
Page 224 |
Page 225 |
Page 226 |
Page 227 |
Page 228 |
Page 229 |
Page 230 |
Page 231 |
Page 232 |
Page 233 |
Page 234 |
Page 235 |
Page 236 |
Page 237 |
Page 238 |
Page 239 |
Page 240 |
Page 241 |
Page 242 |
Page 243 |
Page 244 |
Page 245 |
Page 246 |
Page 247 |
Page 248 |
Page 249 |
Page 250 |
Page 251 |
Page 252 |
Page 253 |
Page 254 |
Page 255 |
Page 256