News Article

MBE-grown GaN Lasers Get Lifetime Boost

Sharp Laboratories Europe has increased the lifetime of its MBE-grown nitride lasers from a few minutes to several hours by reducing the resistance of its p-doped region.

By Richard Stevenson in Montpellier, France
Valerie Bousquet of Sharp Laboratories of Europe (SLE) told the delegates at the International Conference on Blue Lasers and LEDs (ISBLLED) that her team has now extended the lifetime of its MBE-grown nitride lasers to 3 hours.

Although still much shorter than that of the MOCVD-grown nitride lasers that will feature in the first generation of HD-DVD and Blu-ray Disc players, three hours represents a significant improvement on the three minute figure reported last June (see related story).

The latest SLE lasers, which are grown on free-standing substrates produced by Sumitomo and Lumilog, deliver a continuous-wave output of 14 mW at a drive current of 450 mA and have a threshold voltage of 6.5 V.

This represents a 2 V improvement in the threshold voltage compared with previous attempts, and is due to a 15 ohm decrease in the resistance of the p-doped region. Bousquet and colleagues achieved that by switching from a supperlattice structure to a bulk region.

However, she believes that the threshold voltage will need to drop by a further 1.5 V, and be accompanied by a similar fall in the threshold current density, for further improvement to the laser lifetime.

CS International to return to Brussels – bigger and better than ever!

The leading global compound semiconductor conference and exhibition will once again bring together key players from across the value chain for two-days of strategic technical sessions, dynamic talks and unrivalled networking opportunities.

Join us face-to-face between 28th – 29th June 2022

  • View the agenda.
  • 3 for the price of 1. Register your place and gain complementary access to TWO FURTHER industry leading conferences: PIC International and SSI International.
  • Email  or call +44 (0)24 7671 8970 for more details.

*90% of exhibition space has gone - book your booth before it’s too late!


Search the news archive

To close this popup you can press escape or click the close icon.
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:
Live Event