Noun suffixes Participles Laser working principles Laser types and application Laser weapons

LEAD-IN

1. Look at the pictures. Are they all connected to lasers? What might be happening in these pictures? Which devices are shown? How many laser colours do you know and what is the difference between them? In which spheres are lasers used most of all? Try and name as many spheres as you can. Do you know any other laser applications?

PRONUNCIATION

2. Make sure you pronounce the following words properly:

amplify	[ˈæmplıfaı]	irradiance	[ıˈreıdɪəns]
acronym	[ˈækrnım]	longitudinal	[ˌlɒndʒɪˈtju:d(ə)nəl]
predecessor	[ˈpri:dısesə]	instantaneous	[ˌıstən'teınɪəs]
oscillation	[ˌɒsɪˈleı∫(ə)n]	simultaneous	[sım(ə)lˈteınɪəs]
coherence	[kəʊˈhı(ə)rəns]	consequently	[ˈkɒnsikwəntlı]
unattainable	[ˌʌnəˈteınəbl]	supply	[səˈplaı]
redundancy	[rıˈdʌndənsı]	arrange	[əˈreındʒ]
achieve	[əˈt∫i:v]	coupler	[ˈkʌplə]
tiny	[ˈtaını]	bounce	[ˈbaʊns]
launch	[ˈlo:nt∫]	transparent	[trænˈspærənt]
divergence	[daıˈvɜ:dʒ(ə)ns]	medium	[ˈmiːdjəm]

WORD STUDY

3. Translate the following definitions and memorize the terms:

acronym (n) - a word made up from the first letters of the name of something such as an organization. For example NATO is an acronym for the North Atlantic Treaty Organization;