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Fig. 7. Diagrams of experimental installations for the analysis of the induced Raman

scattering in condensed media:

a

— induced Raman scattering by molecular modes (

1

— laser;

2

— lenses;

3

semitransparent plate;

4

— analysed sample;

5

— light filter;

6

— holder;

7

— light guide

probe;

8

— minispectrometer;

9

— computer;

10

— power sensor;

b

— induced globular

scattering in photon crystals (

1

— laser;

2

,

5

,

7

— semitransparent plates;

4

— light filter;

6

— lens;

3

,

8

,

11

— power sensor;

9

— analysed sample;

10

— interferometer;

12

— detector)

a process is allowed both in the centrosymmetrical and non-centrosymmet-

rical media and meets the conservation laws (9).

Fig. 10 shows spectra of the induced Raman scattering by transverse

and longitudinal modes of a ferroelectric lithium niobate crystal placed into

the ruby laser resonator generating giant pulses with a high peak intensity

(

100

mW/cm

2

). In one case, the polar axis of the crystal was directed

along the laser ray (Fig. 10,

a

), in another case, it was perpendicular to the

ISSN 1812-3368. Herald of the BMSTU. Series “Natural Sciences”. 2015. No. 1

45