February 2004

Submarine Systems: From Laboratory to Seabed

Vincent Letellier

Technological advances in recent decades have enabled submarine cable systems to become the backbone of today’s intercontinental telecommunications networks.

Intravascular Optical Coherence Tomography Opens a Window Onto Coronary Artery Disease

In the United States alone, more than 650,000 people die each year of heart attacks related to coronary artery disease. A new technique, intravascular optical coherence tomography, may play an important role in guiding therapeutic interventions, diagnosing atherosclerosis and researching the causes of coronary artery disease.

Wavefront-Guided LASIK

Laser surgery to correct refractive error in the eye has become one of the most widely performed surgical procedures. Studies show most patients who undergo wavefront-guided LASIK, in which individual aberration patterns are measured pre-operatively so a customized ablation pattern can be generated for each eye, are achieving improved visual acuity under all light conditions.

Laser Beam Splitting by Diffractive Optics

Recent advances in diffractive optics theory and technology have made it possible to design programmable, multichannel optical systems based on diffraction gratings, lenslet arrays and digital holography algorithms. Spot array generation, multiple and multifocal imaging, matched filtering, laser beam mode selection and simultaneous contour shaping are among the most promising applications of diffractive beam splitting.

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