Editing Tunable laser (section)

===Applications===
The range of applications of tunable lasers is extremely wide. When coupled to the right filter, a tunable source can be tuned over a few hundreds of nanometers<ref>[http://www.photonetc.com/tunable-laser-source PhotonEtc: Tunable Laser Source from 400nm to 2300nm].</ref><ref>{{usurped|1=[https://web.archive.org/web/20100816065812/http://www.leukos-systems.com/spip.php?rubrique23 Leukos : White light compact supercontinuum systems]}}.</ref><ref>[http://www.fianium.com/supercontinuum.htm Fianium : Powerful WhiteLase Supercontinuum Sources].</ref> with a spectral resolution that can go from 4&nbsp;nm to 0.3&nbsp;nm, depending on the [[wavelength]] range. With a good enough isolation (>OD4), tunable sources can be used for basic [[absorption (electromagnetic radiation)|absorption]] and [[photoluminescence]] studies. They can be used for solar cells characterisation in a light-beam-induced current (LBIC) experiment, from which the [[external quantum efficiency]] (EQE) of a device can be mapped.<ref>{{cite journal |author=L. Lombez|title= Micrometric investigation of external quantum efficiency in microcrystalline CuInGa(S,Se)<sub>2</sub> solar cells |journal=Thin Solid Films |pages=32–36 |date=2014 |doi=10.1016/j.tsf.2014.06.041 |bibcode= 2014TSF...565...32L |display-authors=etal |volume=565}}</ref> They can also be used for the characterisation of gold [[nanoparticle]]s<ref>{{cite journal |author=S. Patskovsky|title= Wide-field hyperspectral 3D imaging of functionalized gold nanoparticles targeting cancer cells by reflected light microscopy|journal=Journal of Biophotonics |pages= 401–407|date=2014 |doi= 10.1002/jbio.201400025|display-authors=etal |volume=8|issue= 5 |pmid=24961507|s2cid= 6797985}}</ref> and single-walled [[carbon nanotube]] [[thermopile|thermopiles]],<ref>{{cite journal |vauthors=St-Antoine B, etal |title= Single-Walled Carbon Nanotube Thermopile For Broadband Light Detection |journal=Nano Letters |volume= 11 |issue= 2 |pages=609–613 |date=2011 |doi= 10.1021/nl1036947|bibcode= 2011NanoL..11..609S |pmid=21189022}}</ref> where a wide tunable range from 400&nbsp;nm to {{formatnum:1000}}&nbsp;nm is essential. Tunable sources were recently{{When|date=November 2024}} used for the development of [[hyperspectral imaging]] for early detection of retinal diseases where a wide range of wavelengths, a small bandwidth, and outstanding isolation is needed to achieve efficient illumination of the entire [[retina]].<ref>{{cite journal |vauthors=Shahidi AM, etal |title= Regional variation in human retinal vessel oxygen saturation |journal=Exp Eye Res |pages=143–7 |date=2013 |doi=10.1016/j.exer.2013.06.001 |volume=113 |pmid=23791637}}</ref><ref>[http://www.photonetc.com/retinal-imaging Tunable Lasers For Retinal Imaging].</ref> Tunable sources can be a powerful tool for [[reflectivity|reflection]] and [[transmission spectroscopy]], [[photobiology]], detector calibration, hyperspectral imaging, and [[steady-state]] pump probe experiments, to name only a few.