O'Reilly logo

Electro-Optical Instrumentation: Sensing and Measuring with Lasers by Silvano Donati - University of Pavia

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 2Alignment, Pointing, and Sizing Instruments

One of the specific properties of laser sources is the ability to supply a well-collimated light beam. In free propagation, the beam of a common laser like the He-Ne laser (see Appendix A1) can be visualized at a distance much larger than an ordinary flashlight can attain. This is a consequence of the low angular divergence of the laser beam and has the well-known application to laser pointers.

The divergence of the laser beam is usually the small value dictated by the diffraction limit. The diffraction limit is reached because the source generates light in the single-mode spatial regime, which is a condition easy to meet, especially with He-Ne lasers. The property of the laser emitting a ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required