+44 (0)24 7671 8970
More publications     •     Advertise with us     •     Contact us
 
Technical Insight

High-power 980nm VCSEL arrays in demand (Research Review)

Investigations into both edge-emitting laser diodes and VCSELs are being driven in part by demand for compact, high-power devices for use in materials processing, printing, medical applications and free-space data transmission. This paper by Miller and colleagues from the University of Ulm (Phot. Tech. Lett. 2001 13(3) 173) describes an array consisting of 19 high-power VCSELs operating at 980 nm. The devices (see ) were grown by MBE and contain C-doped upper Bragg reflectors made up of 30 pairs of Al0.9Ga0.1As/GaAs layers. The active region comprises three 8 nm thick In0.2Ga0.8As quantum wells. Above the p-type cladding, a 30 nm thick layer of AlAs is added, which is partially wet etched at 410C after mesa etching to form 50 m apertures, which are spaced 100 m apart. The total array size was 0.64 mm2. Backside light emission through the 150 m thick GaAs substrate is facilitated by an n-type DBR with only 20 Si-doped mirror pairs with the same composition as the p-type reflector. The GaAs substrate was coated with an anti-reflection layer and the device also employs a diamond heat spreader and copper heat sink. Each device provides 1.08 W of CW output at room temperature and 1.4 W at a heat sink temperature of 10C, corresponding to a total power density for the array of 1 kW/cm2. A beam divergence of 16 FWHM was also achieved, and the circularly symmetric far-field pattern allows for simple focusing of the beam with power densities of over 10 kW/cm2. Long-term testing has shown the device to be reliable for at least 10 000 h, with less than 1% degradation in output per 1000 h.
×
Search the news archive

To close this popup you can press escape or click the close icon.
×
  • 1st January 1970
  • 1st January 1970
  • 1st January 1970
  • 1st January 1970
  • View all news 22645 more articles
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in: