<story><title>World’s Shortest Wavelength Laser Diode Emits Deep UV Light at Room Temperature</title><url>https://iopscience.iop.org/article/10.7567/1882-0786/ab50e0</url></story><parent_chain></parent_chain><comment><author>rubidium</author><text>In the atomic research world, diode lasers are great because they’re cheap and fairly tunable.&lt;p&gt;Many of atomic cooling studies  done 20 years ago were done using rubidium because it had a primary absorption wavelength that matched what commercial CD players used. This made the 780nm diodes dirt cheap.&lt;p&gt;Having new wavelengths of diode lasers makes certain basic research more accessible. I’ve been out of the field too long to know where this one may help but it’s exciting to see progress.</text></comment>
<story><title>World’s Shortest Wavelength Laser Diode Emits Deep UV Light at Room Temperature</title><url>https://iopscience.iop.org/article/10.7567/1882-0786/ab50e0</url></story><parent_chain></parent_chain><comment><author>howardD</author><text>Normally, in LEDs and solid state lasers, there is a direct relation between wavelength(energy quantum) (electron-Volts) and operating voltage (Volts).&lt;p&gt;For example Red = 660 nanometers = 1.8 electron-Volts = 1.8 Volts, which is the typical operating voltage for a Red LED.&lt;p&gt;Blue = 470 nm = 3.3 eV = 3.3 Volts operating voltage.&lt;p&gt;So: Deep UV (270 nm) is supposed to operate on ~4.6 Volts.&lt;p&gt;But article mentions 13.8 Volts. I wonder why there is such a huge gap?</text></comment>