F. J. Duarte
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Francisco Javier "Frank" Duarte is a laser physicist and author/editor of several books on tunable lasers.
F. J. Duarte at a meeting of the Optical Society in 2006
Duarte's polarization rotator
Tunable laser
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A tunable laser is a laser whose wavelength of operation can be altered in a controlled manner. While all laser gain media allow small shifts in output wavelength, only a few types of lasers allow continuous tuning over a significant wavelength range.
CW dye laser based on Rhodamine 6G. The dye laser is considered to be the first broadly tunable laser.
A typical laser diode. When mounted with external optics these lasers can be tuned mainly in the red and near infrared.