Nonlinear optical (NLO) materials have long been known to interact with light, to produce a nonlinear response. Nonlinear optical materials use nonlinear dependence of the refraction index on the applied electric field to produce other frequencies. This results in either harmonic generation or frequency shifting. The development of the field was …

In 2018, China surpassed the U.S. Navy as the world’s largest naval force.  China has now launched a new “world-leading unmanned warship” that is supposedly ready for combat, Chinese media reports. The JARI multi-purpose unmanned combat vessel, a new product of the state-owned China Shipbuilding Industry Corporation, is 50 feet …