Holographic characteristics of a thick self-developing photosensitive medium - dye-doped jelly-like gelatin are
investigated by means of pulsed laser exposure. The experiments were performed using aqueous gelatin solutions of
Rhodamin 6G with a layer thickness of 1 mm. The slanted holographic gratings were written with two crossed beams
from a frequency-doubled (λ = 532 nm) and Q-switched YAG:Nd laser (τ0.5 ≈ 17 ns, f ≤ 50 Hz). In the course of recording the hologram was read with the beam from a single-mode He-Ne laser (λ = 632.8 nm) which was not absorbed
by the photosensitive medium. The real-time evolution of the grating diffraction efficiency was studied in dependence of
the dye and gelatin concentration as well as the writing pulse fluence. It is shown that under appropriate choice of the
medium composition and parameters of the recording radiation, it is possible to obtain phase volume holographic
gratings with a diffraction efficiency of ~ 87 % and an angular selectivity of ~ 20'.
Simultaneous generation of several wavelengths in a steady-state distributed feedback (DFB) laser on jelly-like dyedoped
gelatin is reported. It is shown that such lasing regime of the device is possible when a set of the stationary spatial
gratings of different periods is prerecorded in the same volume of its active medium. Holographic characteristics of the
employed photosensitive medium have been studied. The 2nd harmonic radiation (&lgr; = 532 nm) of the nanosecond
(&tgr;0.5 ≈ 17 ns) YAG:Nd laser was used for recording the gratings. The obtained holograms were readout with the help of a
single-mode He-Ne laser radiation. Both picosecond and nanosecond YAG:Nd lasers were used for DFB laser excitation.
The stable multiwavelength operation of a DFB laser at two and three narrow spectral lines simultaneously was obtained.
The minimum and maximum clearance between simultaneously emitted spectral lines was measured to be ~ 0.09 and
~25 nm, respectively, at spectral width of separate lines of ~ 0.01 nm.
It is shown that distributed feedback (DFB) dye laser may be efficiently employed for measurement of the refractive index of liquid and solid laser materials. Spectral and temperature dependencies of refractive index of dye laser solutions, polymer matrices and micro-porous quartz samples doped with dye are investigated. The change of refractive index of the sample was determined by the wavelength shift of DFB dye laser. A home-made DFB dye lasers with liquid and solid active media tunable in a wide spectral range (400 nm - 760 nm) were used in the experiments.
A new modification of distributed feedback dye laser (DFDL) which is well suited for spectroscopical applications in biology and in other fields is presented. Due to the original arrangement for the pumping of the dye solution the proposed novel DFDL provides the stable generation of picosecond pulses continuously tunable from near UV to near IR when TEA N2-laser is used as the pump source.
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