Thin-film III-V lasers bonded to silicon have low threshold-current densities

Oct. 1, 2009
In a step that brings practical on-chip optical interconnects closer to reality, researchers at Duke University (Durham, NC) and the University of Wisconsin-Madison have developed an improved thin-film III-V edge-emitting laser bonded to silicon (Si).

In a step that brings practical on-chip optical interconnects closer to reality, researchers at Duke University (Durham, NC) and the University of Wisconsin-Madison have developed an improved thin-film III-V edge-emitting laser bonded to silicon (Si). The enhancements consist of the simultaneous inclusion of metal contacts on both sides of the thin film structure (which helps lower the threshold current density), metal/metal bonding on the bottom of the laser (to dissipate heat), and flexibility in the metal-contact geometry, which allows the laser to be optimized for either high power or single-mode operation.

Click here to enlarge image

The thin-film layers in the single-quantum-well separate-confinement-heterostructure laser were various combinations of aluminum, gallium, indium, and arsenic (some doped with Si or zinc). Two types were created: a gain-guided version with a bottom p-stripe and a top n-stripe; and an index-guided version with a bottom p-ridge and a top n-stripe. Both lased at a 995 nm wavelength. The injected threshold-current density for the first type was 420 A/cm2, and for the second was 244 A/cm2—among the lowest ever reported for these sorts of lasers, say the researchers. Contact Sabarni Palit at [email protected].

Sponsored Recommendations

How to Tune Servo Systems: Force Control

Oct. 23, 2024
Tuning the servo system to meet or exceed the performance specification can be a troubling task, join our webinar to learn to optimize performance.

Laser Machining: Dynamic Error Reduction via Galvo Compensation

Oct. 23, 2024
A common misconception is that high throughput implies higher speeds, but the real factor that impacts throughput is higher accelerations. Read more here!

Boost Productivity and Process Quality in High-Performance Laser Processing

Oct. 23, 2024
Read a discussion about developments in high-dynamic laser processing that improve process throughput and part quality.

Precision Automation Technologies that Minimize Laser Cut Hypotube Manufacturing Risk

Oct. 23, 2024
In this webinar, you will discover the precision automation technologies essential for manufacturing high-quality laser-cut hypotubes. Learn key processes, techniques, and best...

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!