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Read Laser Focus World Magazine, July 2009 Online

Features
PHOTONIC FRONTIERS: MONSTER GROUND TELESCOPES: Bigger is better for ground telescopes: Super-giants will reach 24 to 42 m
Three super-giant ground telescopes planned to begin operation in 2018 have apertures two to four times larger than today’s biggest optical instruments.

TERAHERTZ DETECTORS: Quantum dots enable integrated terahertz imager
A highly sensitive and frequency tunable terahertz detector based on carbon nanotube quantum dots is the main ingredient for a near-field terahertz imaging system in which all components—an aperture, a probe, and a detector—are integrated on one semiconductor chip.

Q-SWITCHED LASERS: Uses proliferate for high-energy picosecond UV lasers
High-energy, ultrashort-pulse ultraviolet lasers are useful for many practical applications—for example, fabrication of solar cells and flat-panel displays, 3-D information storage, cutting of thick sheets of material, photomask manufacturing, and remote sensing.

PHOTONICS APPLIED: PHOTONICS IN MEDICINE: Low-level light therapy: It’s all about wavelength and power
While the benefits and detriments of sunlight have been known for decades, researchers are showing that electromagnetic radiation can be the key to safe and effective medical therapies, but only when applied at specific wavelengths and power levels.

SPECIALTY FIBERS: Targeted pulse-energy routing in fiber drives nonsupercontinuum applications
While routing femtosecond pulse energy to a broadband spectrum in optical fibers is important, many emerging nonsupercontinuum applications require selective routing of the pulse energy to an isolated spectral band by exploiting certain properties of the optical fiber itself.

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