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11. Put these words in the right order to make sentences.

1. Some / lasers / power / on / applications / of / constant / depend / a / whose / output / over / is / time / beam /.

2. The / laser / mechanism / emission / producing / radiation / in / a / of / on / relies, stimulated.

3. The, the, the, of, for, is, process, supplying, called, energy, required, amplification / pumping /.

4. Albert / and / Einstein / established / for / the / the / the / theoretic / foundations / laser / maser /.

5. Solid-state / glass / which / lasers / that / use / a / or / rod / is / "doped" / with / ions / energy / provide / the / required / crystalline / states /.

6. The / emitted / output / beam / through / laser / is / this / mirror /.

7. The / which / absorbs / some / pump / energy / higher-energy / quantum / raises, electrons, into, gain, medium, states /.

8. Particles / emitting / by / can / with / either / absorbing / or / interact / light / photons /.

9. The / the / the / process / for / is / of / supplying / energy / required / pumping / amplification / called /.

12. Match the first part (1-9) of the sentence with the second one (a-h) :

1. The emitted laser light ...

2. A beam produced by a thermal or other incoherent light source ...

3. Pumping can interact with light by …

4. Particles have …

5. Emission ...

6. The gain medium ...

7. Stimulated emission is …

8. An optical amplifier is …

9. A light beam or beam of light is …

a) … a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal.

b) … the process by which an atomic electron interacting with an electromagnetic wave of a certain frequency.

c) … an instantaneous amplitude and phase which vary randomly with respect to time and position.

d) … a narrow projection of light energy radiating from a source into a beam.

e) … is notable for its high degree of spatial and temporal coherence.

e) … is the process of supplying the energy required for the amplification is called.

f) … is a material with properties that allow it to amplify light by stimulated emission.

g) … can be spontaneous or stimulated.

h) … either absorbing or emitting photons.

13. Read and translate the sentences paying attention to the Subjunctive mood:

1. It is important that safety measures be taken while working with the electric equipment.

2. Without the new instrument this experiment would not have been successful.

3. It is required that those devices be used in this case.

4. It is important that engineers should develop automatic control systems.

5. It would be interesting to develop some new substitute materials.

6. Engineers must know how the selected material will resist loading conditions lest any accidents should happen.

7. I should like to carry on my research work in the field of engineering materials.

8. If I were an engineer I would repair this device.

14. Put the verbs in the form of the Subjunctive Mood in the following sentences, translate them into Ukrainian:

1. It is necessary that an engineer (to know) the properties of engineering materials.

2. It is important that the designer (to utilize) the services of a mate­rials engineer.

3. It is necessary that the number of machines at our plant (to increase).

4. The engineer demanded that the materials which are to be used in the construction (to test).

5. We propose that the designer (to use) new substitute materials in the construction of the new machine.

6. It is desired that the final result of an experiment (to accurate)

7. We were told we (to make) experiments under the directions of a skilled instructor.

8. It (to be) important to use the new alloy in the construction of this machine.

9. It (to be) hard to select the most suitable material without a thorough knowledge of the properties of engineering materials.

10. It (to be) interesting to develop some new substitute materials.

11. Не insists that the equipment (to bring) in a week.

12. The teacher insists that her students (to be) on time.