Task 10. Read the text «Lasers», fill in the gaps using the words below, and translate it into Russian

Lasers

Lasers (Light Amplification by Stimulated Emission of Radiation) are _(1)_ which amplify light and produce beams of light which are very intense, directional, and pure in colour. Based on the laser medium used, lasers are generally classified as _(2)_ state, gas, semiconductor, or liquid.

When lasers were invented in 1960, some people thought they could be used as «death rays». In the 1980s, the United States experimented with lasers as a _(3)_ against nuclear missiles. Nowadays, they are used to _(4)_ targets. But apart from military uses, they have many applications in engineering, communications, medicine, and the arts.

In engineering, powerful laser _(5)_ can be focused on a small area. These beams can heat, melt, or vaporize material in a very precise way. They can be used for drilling diamonds, cutting complex shapes in materials from plastics to steel, for spot welding and for surfacing techniques, such as hardening aircraft engine turbine blades. Laser beams can also be used to _(6)_ and align structures.

Lasers are ideal for communications in space. Laser light can carry many more information _(7)_ than microwaves because of its high frequency. In addition, it can travel long distances without _(8)_ signal strength. Lasers can also be used for information recording and reading. Compact discs are read by lasers.

In medicine, laser beams can treat damaged _(9)_ in a fraction of a second without harming healthy tissue. They can be used in very precise eye operations.

In the arts, lasers can provide fantastic displays of light. Pop concerts are often _(10)_ by laser displays.

devices measure tissue channels

defence accompanied solid beams

identify losing