“The yellow-orange spectral range is strongly absorbed by hemoglobin in the blood, which makes lasers with such
Femtosecond Tunable Yellow Laserthe source can assist in medical procedures that cause less thermal damage and where more selective laser exposure is needed than is currently available.
Researchers led by K. Samantha describe how they used the optical phenomenon of nonlinear frequency conversion to convert mid-infrared laser light into yellow light that can be tuned from 570 to 596 nanometers.
“We demonstrate robust, powerful, ultrafast, tunable yellow light in a fairly simple experimental configuration,” Ghosh said.
Although studies have shown that laserRadiation in the yellow spectral range is optimal for various medical procedures, such wavelengths are usually created using bulky and inefficient copper vapor lasers, dye lasers and parametric light oscillators.
Researchers have created a more practical laserusing a newly developed ultra-fast mid-infrared solid-state laser and a two-stage frequency doubling process. Doubling the frequency of an ultrafast laser is a tricky process that requires identifying the correct crystal to produce high-quality laser light with the desired properties.
Tests of the new laser have shown that it canDeliver over 1 W maximum average output power with 130 femtosecond pulses at 80 MHz repetition rate with outstanding spatial beam profile. The laser also showed excellent power stability over time.
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