To: Steve who wrote (4506 ) 3/25/2000 10:45:00 PM From: dwight martin Respond to of 7720
Beatin' Those Low-Power Blue Laser Blues...Good news for fans of home theaters: Projection displays stand to get a lot brighter--and cheaper--with a new, compact blue laser developed by Gemfire Corporation (Palo Alto, CA). The company's technology is scalable, which means multiple blue lasers could be combined into high-power arrays that are more efficient and brighter than conventional projection methods. It will also cost much less than existing blue-green lasers because the design uses low-cost, frequency-doubled infrared (IR) diode lasers. In addition to projection displays, the blue laser could enable higher-density optical data storage devices. BMDO funded Gemfire to develop this laser for use in data storage systems for battlefield management applications. Gemfire's innovation uses a 830-nanometer (nm) IR diode laser and a second-harmonic generator (frequency doubler) to create a 415-nm beam. Output beams anywhere in the visible spectrum are possible by varying the input IR laser wavelength. The key component of the blue laser source is a 0.5 H 5 H 15-millimeter chip of lithium niobate (LiNbO3) material. The diode laser irradiates a polarization rotator integrated on the LiNbO3 chip, which changes the light's polarization from horizontal to vertical. Then, the light's frequency is doubled by the second-harmonic generator, which halves the wavelength to produce blue light. Focusing on the lucrative projection display market, Gemfire has already created a 20-milliwatt prototype laser, which is available for demonstration. It currently is seeking display manufacturers and other companies interested in making full-color projection displays. Once its presence in the display market is established, Gemfire will investigate other potential markets in which the company can compete by mass-producing low-cost blue lasers. Contact Jim Stanley of Gemfire at (650) 849-6887, or click here for more information acq.osd.mil