Abstract
This chapter discusses interference spectroscopy, where it explores the use of interferometric techniques in high-resolution spectroscopy. Interference spectroscopes combine high resolution and high throughput. The chapter describes the resolving power of a spectroscope and etendue. The etendue of a grating spectroscope is limited by the entrance slit, which must be quite narrow for maximum resolution. Maximum throughput is obtained with the confocal Fabry–Perot interferometer (FPI), which consists of two transparent plates with flat surfaces. The chapter provides an introduction to the interference and birefringent filters. An interference filter can be thought of as a Fabry–Perot interferometer in which the two highly reflecting layers are separated by a thin-spacer layer of a transparent material. Also, the chapter explains the Interference wavelength meters that are widely used with tunable dye lasers. Interference wavelength meters can be used for accurate measurements of dye laser wavelengths. Laser frequency measurements are discussed. Extremely accurate measurements of laser frequencies can be made with a frequency comb.
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