ABSTRACT
This chapter discusses how to use lasers for alignment of other components and laser systems and how the laser scientists or engineers can be used to probe unknown material properties and to perform precise measurements. It considers various applications for lasers in the field. Tunable lasers, such as the dye laser, is very useful in probing the absorption, transmission, and fluorescence spectra of materials such as gasses, optically transmissive components, and even of surfaces. Laser beams can be modulated just like radio and microwave beams can. Likewise, laser beams can be encoded with communications signals such as voice and data signals. Lasers are used to remove tumors and to perform other types of surgeries as well as to stimulate photosensitive drugs in laser photodynamic cancer therapies. Lasers are used for many dermatological purposes such as removing skin cancers, blemishes, tattoos, and even for skin rejuvenation.
