Put the missed sentences into the correct places in the text.

Date: 2015-10-07; view: 425.

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Laser

Do you know any of its alternatives?

What principle does it work on?

What do you know about lasers?

Starting point

Unit 7

1. __________. The laser is becoming the most widely used light source to excite tissues for disease diagnosis as well as to irradiate tumors for tissue removal in interventional treatment.

2. The word “laser” is an acronym for “light amplification by stimulated emission of radiation”. Einstein, who postulated photons and the phenomenon of stimulated emission, can be considered the grandfather of the laser. ___________.

3. Lasers are now used as excitation light sources in disease diagnostics and as optical scalpels in interventional surgery. Ideal light sources because of their monochromaticity and intensity, lasers can be coupled to optical fibers inserted into endoscope for in vivo diagnosis of diseases. ___________. Computers are used to control the intensity and direction of the laser beam, thus reducing human error.

4. Nowadays lasers are commonly used to perform surgery on the skin and can be used to remove wrinkles, tattoos, birthmarks, tumors and warts. _____________. Lasers are used to treat eye condition; in some individuals, visual problems can be corrected with laser surgery.

5. Lasers can help treat some forms of glaucoma and eye problems related to diabetes and are being incorporated into surgical procedures for other parts of the body as well. These include the heart, prostate gland and throat. __________. Knives and scalpels may be completely eliminated one day.

A. They also have the advantages of increased precision and reduced rates of infection and bleeding.

B. Other types of growths can also be removed.

C. Lasers are also used to open clogged arteries and remove blockages caused by tumors.

D. The first successful optical laser was constructed by Maiman in 1960.

E. The invention of the laser was an important milestone in the development of biomedical photonics.