Depending on the concentration of the dopant, synthetic ruby usually comes in either pink or red. In 1958, after the inventor of the maser, Charles Townes, and his colleague, Arthur Schawlow, published an article in the Physical Review regarding the idea of optical masers, the race to build a working model began. A. Morozov & V. P. Khyuppenen Journal of Applied Spectroscopy volume 21, pages 1454 – … Laser Engraving . [5] The ruby laser was the first laser used to optically pump tunable dye lasers and is particularly well suited to excite laser dyes emitting in the near infrared. The schematic diagram of ruby laser can be drawn as: The ruby lazer consists of a ruby rod . Study Design/Materials and Methods: The normal-mode ruby laser (Epi-laser; 694 nm, 3 msec) was used to treat a wide range of body sites in 51 volunteers. The finely polished ends of the rod were silvered; one end completely, the other only partially. Optical cavity of ruby laser is short as compared to other lasers, which may be considered a disadvantage. In 1960 Maiman designed the first working ruby laser. [16] The continuous ruby laser was the first laser to be used in medicine. The switching control of the R.F source is used to switch on and off the flash light so that excessive heat should not be generated due to very high frequency of the movement of the electron. Using these new crystals external to the laser cavity conversion efficiencies up to 40% have been achieved using an incident unfocussed beam of about 130 MW/cm 2.After 5–10 shots, a first small internal damage spot appeared inside the LiIO 3 crystal. [CDATA[// >