Here is a list of links to some of the other research going on in the field of non-linear spectroscopy. This list is by no means comprehensive. However, we have picked sites that contain a large amount of information about the field. Sites that are exceptionally good about the subject matter are given top listing in each category.

Dictionary of optical terms:

http://www.photonics.com/dictHome.aspx

Encyclopedia of Laser Physics:

http://www.rp-photonics.com/encyclopedia.html

Raman, resonance Raman, CARS, and other stimulated Raman theory:

http://www-amop.phy.cam.ac.uk/
http://www.bath.ac.uk/~pysdw/reports.htm
http://www.sci.sdsu.edu/TFrey/Bio750/IR%26Raman.html

Fluorescence, Laser-Induced Fluorescence, and Time-Resolved Fluorescence:

http://www.shu.ac.uk/schools/sci/chem/tutorials/molspec/lumin1.htm

Ultrafast Pulse Phenomena, Overview (with description of phasematching):

http://www.st-andrews.ac.uk/~wsquad/background/opo/opost.htm

OPO theory: 

http://www.st-andrews.ac.uk/~scnlo/pdfs/45.pdf

SHG, SFG theory (also applies to THG, DFG):

http://moebius.physik.tu-berlin.de/lc/shg/shg.html

Applications of CARS in combustion experiments (brief descriptions only):

http://www.frascati.enea.it/spettro/ram_spe.htm

Research Group Web Pages (several others exist but have no home pages):

Fleming group at U Berkeley: http://www.cchem.berkeley.edu/grfgrp/
Kiefer group at Wurzburg: http://www.phys-chemie.uni-wuerzburg.de/kiefer/Web/Topics/topapp.html
Fayer group at Stanford: http://exciton.stanford.edu/fayer_lab/index.htm
Tokmakoff group at MIT: http://web.mit.edu/~tokmakofflab/index.html
Dlott group at U Illinois: http://dlottgroup.scs.uiuc.edu/group/index.htm
Dantus group at MSU: http://www.cem.msu.edu/~dantus/index.html
Wiersma group: http://www.chem.rug.nl/spectro/
Mukamel group at UC Irvine: http://bose.ps.uci.edu/
Shen group at U Berkeley: http://physics.berkeley.edu/research/shen/
Warren group at Duke: http://www.chem.duke.edu/~wwarren/
Miller group at U Toronto: http://lphys.chem.utoronto.ca/
RLBL at U Penn: http://rlbl.chem.upenn.edu

The number of nonlinear spectroscopies is staggering. This page does not discuss some of the non-linear spectroscopies directly related to the index of refraction of materials, such as the Kerr effect, self-focusing, and laser-induced birefringence.  As for linear spectroscopy (including lasers), we have placed links to much more detailed lists of the various optical research groups around the globe, as well as a few educational sites.

LEOS (Lasers and Electro-Optics Society):
http://www.i-LEOS.org/

CREOL (Center for Research and Education in Optics and Lasers):
http://www.creol.ucf.edu/

U Rochester’s Institute of Optics:
http://www.optics.rochester.edu/

Laser Focus World:
http://lfw.pennnet.com/home.cfm

Sam’s Laser FAQ:
http://www.misty.com/people/don/lasersam.html

List of researchers in non-linear optics:
http://psi.ece.jhu.edu/~kaplan/nonlin.html

Links to the University of Wisconsin-Madison

UW-Madison's Main Page: www.wisc.edu
UW Chemistry Department Main Page: www.chem.wisc.edu
Analytical Sciences Web Site: http://analytical.chem.wisc.edu