Lasers have been part of the human world for the past ten years with the implementations of laser pointers and CD players to medicine and science research. Lasers are also significant because of its précised way of production and have an exact emission color. We can also picture out lasers as an electronic device we can touch and hold with our bare hands or as a huge box in the center of a research laboratory.

Fluorescent dyes are also common in research and used in to diagnose or distinguish specific cell and tissue types. To light up a fluorescent dye makes it to produce and discharge the light with a distinctive color. This color and intensity are used for measurement in concentrations of different chemical substances like DNA and proteins. The essential disadvantage of fluorescent dyes is that only limited colors can be identified.

Two different technologies that have joined research identifies that if a dye is put in an optical cavity, it can produce a laser. This optical cavity is an electric equipment that keeps light. Based on the research of the journal Nature Photonics, it can give a tiny laser that produce and release light inside a single living cell.

When it comes to attentively designing a laser, it is possible to reach 1 trillion cells which have extraordinary label. That is approximately similar to the total number of cells in the human body. For this reason, every cell in the human body can be possibly identified and monitored. This is a long jump from cell-tagging methods which can tag at most few hundred cells. Up to this time, Petri dishes were only tagged cells and it is still possible that it can also work for human body cells.

S. Yun