31. For wavelengths in the near infrared and longer, the penetration depth varies from a metre to a few micrometres. 32. The absorption of the cyan dye extends into the near infrared region, making this layer opaque to infrared radiation. 33. The IVCT band is usually observed in the visible or near infrared region of the spectrum and is broad. 34. It shows almost no absorption features in the near infrared , which may indicate an iron or enstatite chondrite surface composition. 35. In the near infrared , this corresponds to a wavelength separation between pump light and laser-output light of about 100 nm. 36. One example is " lidar ", which uses ultraviolet, visible, or near infrared light from lasers rather than radio waves. 37. Nanoshells can be varied across a broad range of the light spectrum that spans the visible and near infrared regions. 38. For astrophotography, many photogenic targets ( such as emission nebulae ) are bright in the far red and near infrared . 39. Later work involved solar spectroscopy in the near infrared and participation in a solar flare patrol program in the 1950s. 40. Many optical telescopes, such as those at Keck Observatory, operate effectively in the near infrared as well as at visible wavelengths.
