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ankle Minis"—and an inmrnu'd HenKit k Steenhlik is applying holography to an old-fashioned idea: 3-D glasses. A lbNO mechanical engineering —spectrometers are a good example. These instruments seperate light into wavelength components for spectral analysis, says Hartman. "The advantages of the holographic process are our ability to fabricate the gratings with specific diffraction characteristics, gratings of large surface area, and enhanced fabrication ease. "The old technique required the use of time-consuming ruling methods with limited capabilities for grating fabrication." Holography is also useful in devising input couplers for optical wave guides—"a means of getting light into very thin optical wave
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