Laser - Design. 1  Gain medium. 2  Laser pumping energy. 3  High reflector. 4  Output coupler. 5  Laser beam. 6  A laser consists of a gain medium, a mechanism to energize it, and something to provide optical feedback. 7  For the gain medium to amplify light, it needs to be supplied with energy in a process called pumping.
Children should get a booster vaccine called Tdap (which protects against tetanus, diphtheria, and whooping cough) at 11 or 12 years of age. Adults need a booster called the Td vaccine (for tetanus and diphtheria) every 10 years. Adults should also receive a one-time shot of the Tdap vaccine in place of one Td shot. Tetanus is a serious disease caused by a toxin (poison) made by bacteria.
Read about the Tdap vaccine and the importance of getting it. The Tdap vaccine is a combination booster shot. It protects preteens and adults against three diseases: tetanus, diphtheria, and pertussis (or whooping cough).Tetanus and diphtheria are rare in the United States today, but whooping cough continues to spread.ou shouldnât get a Tdap booster if: 1  You have had a previous life-threatening allergic reaction to any vaccine containing tetanus, diphtheria, or pertussis. 2  You had coma or seizures within seven days of a childhood dose of DTP or DTaP, or a previous dose of Tdap.