Nice find on the patent.<p>&gt; So, what this product needs in order to work is a fiber that&#x27;s durable enough to survive being dragged across skin while having very little cladding so as to allow evanescent coupling.<p>Facial hairs are alleged to be of similar toughness to copper wire when dry (see [0], too lazy to find a better reference).  I have a difficult time conceiving how one could drag a multimode fiber across one&#x27;s face without abrading the fiber to the point of failure.<p>&gt; Second, they need to pack a high power multi-wavelength laser source and the power reserve to run it into a very tiny handle.<p>What is even trickier is incorporating a cooling mechanism for the theoretical self-contained, handheld, high-power, battery-powered white laser.<p>&gt; There&#x27;s nothing here that looks outright impossible to me. Just very, very tricky.<p>If it were not self-contained in a handheld unit, then yes, maybe it would be possible.  I&#x27;m going to say that the their device, based on the proposed renderings, is impossible even if one were to throw Apple&#x27;s war chest of money at it.  There are also the problems of eye safety, skin exposure, heat, and fumes that remain to be overcome.<p>[0] <a href="http:&#x2F;&#x2F;www.economist.com&#x2F;node&#x2F;2281888" rel="nofollow">http:&#x2F;&#x2F;www.economist.com&#x2F;node&#x2F;2281888</a>