First, the Wright research group at the University of Wisconsin-Madison presents its research using "narrow frequency distribution of tunable laser sources to gain spectral selectivity in an analytical measurement" (1). Along with a summary of its research and techniques, this website offers a great introduction to the fundamentals of non-linear spectroscopy. The second site describes the Ernest Orlando Lawrence Berkeley National Laboratory's success in observing non-linear spectra from chiral molecules (2). With the help of a pictorial poster, users can understand the complex issues of chiral vibrations and spectra. Next, the Sasada lab at Keio University summarizes its research interests in optical communications (3 ). Visitors can find diagrams illustrating absolute frequency difference measurements and the techniques used in the work. The fourth website describes the Regional Laser and Biomedical Technology Laboratories (RLBL) of the University of Pennsylvania's applications of laser spectroscopy in the biochemical, biophysical, and biomedical fields (4 ). Researchers can find out about using the laboratory's facilities, its technological developments, educational opportunities, and much more. Next, the University of Durham describes its examination of spectroscopy of Rubidium vapor (5). Users can learn about its conclusions that "the standard designation of 'saturation spectroscopy' is a misnomer in multilevel systems where hyperfine pumping can occur." At the sixth site, the Laboratories for Biophysical Dynamics' Nano-Biophotonics group addresses its applications of nanotechnology and non-linear spectroscopy to the biology field (6). Visitors can find synopses of its four main research projects and a list of publications. Lastly, the European Laboratory for Non Linear Spectroscopy (LENS) offers an introduction to its goal "to provide advanced laser and spectroscopic facilities for researchers from European countries and to promote and facilitate the exchange of ideas, scientific techniques, and technical skills" (7). Individuals can fine descriptions of past and upcoming events and seminars, lists of publication, and training and job opportunities.