27 Sep 2002
The pick of this week's hottest patent applications in the world of photonics.
• Highly efficient quantum-dot lasers may be one step closer to reality. Agilent Technologies, US, is trying to patent a new type of quantum-dot structure that allegedly gives highly efficient optical emission at a wavelength of 1.4 microns. Detailed in international patent application WO 075876, the invention is based on an n-i-p structure consisting of a p-type gallium-arsenide substrate and an active region of indium-gallium-arsenide quantum wells.
• With the Ryder Cup in full swing, there's no better time to get out the golf clubs and practice your putting. Ujin Corporation from Korea hopes to simplify the task with its latest invention (WO 02/074398). The firm's laser headset projects a series of dots on an imaginary line between the ball and hole to help a golfer optimize his aim.
• An "accelerated solar ageing device" that offers an efficient way of testing the effects of the sunlight on products such as cosmetics, perfumes, plastics and paints has been unveiled by a French company. Solsys of Marseille outlines the idea in international patent application WO 02/075283. The products under test are illuminated by several pulsed xenon lamps that emit a photonic spectrum that is equivalent to solar radiation and rich in infrared light.
Oliver Graydon is editor of Optics.org and Opto & Laser Europe magazine.