31. In 2008, the first dark pulse laser was reported in a quantum dot diode laser with a saturable absorber. 32. One of the newest machines, the Coherent Lightsheer Diode Laser , is being promoted for its " cool-tip " technology. 33. In 2004, excluding diode lasers , approximately 131, 000 lasers were sold with a value of US $ 2.19 billion. 34. Many applications of diode lasers primarily make use of the " directed energy " property of an optical beam. 35. Semiconductive gallium nitride and indium gallium nitride produce blue and violet light-emitting diodes ( LEDs ) and diode lasers . 36. The review found no statistical difference in effectiveness, but a higher incidence of side effects with diode laser treatment. 37. A typical SERF atomic magnetometer can take advantage of low noise diode lasers to polarize and monitor spin precession. 38. Many of the advances in reliability of diode lasers in the last 20 years remain proprietary to their developers. 39. Different diode lasers are used based on the application and the range over which tuning is to be performed. 40. A 2006 article in the journal " Lasers in Medical Science " compared IPL and both alexandrite and diode lasers .
