1.1 Rhodamine 6G Laser with Laser Pumping for Holography, Resonance …
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grating rotation. Figure 1.2b shows the spectrogram where during its mounting some
changes were made, in particular, the resonator length was increased and spatial
coherence spatial coherence with the basis of 100 μm was included, and due to these
changes it became possible to narrow the generation spectrum width of 0.1–0.3 J and
to carry out single-frequency and four-frequency generation regime with the pulse
energy of 10
−3 J and with the pulse power of about 0.1 mW. These changes made it
appropriate for the purposes of holography and resonance interferometry.
Spectogram where the spectra of two pulses were sequentially fixed during the
generation wavelength tuning through grating rotation is shown in Fig. 1.2. In this
case, maximal generation energy is 0.006 J.
For further generation spectrum narrowing into the Rhodamine 6G laser, the
Fabry–Perot interferometer (9) with the basis of 100 μm (free spectral range is
1.8 nm) was included, the mirrors of which had dielectric covers with the reflection
index of 70%. Great dispersion of the Fabry–Perot interferometer equal to 1.8 nm
provides narrowing of generation lines up to 0.01–0.03 nm that corresponds to the
Fig. 1.2 Generation spectra of rhodamine 6G dye laser with laser pumping: a the non-selective
resonator (the mirrors are R = 100%, R = 60%, the resonator length is 20 cm); b selective resonator
(the diffraction grating, the exit mirror is R = 60%); c selective resonator (the diffraction grating, the
exit mirror is R = 60%, Fabry–Perot interferometer, four impulses with Fabry–Perot interferometer
sequential slope); d four-frequency generation mode. Reprinted from [54] with permission
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grating rotation. Figure 1.2b shows the spectrogram where during its mounting some
changes were made, in particular, the resonator length was increased and spatial
coherence spatial coherence with the basis of 100 μm was included, and due to these
changes it became possible to narrow the generation spectrum width of 0.1–0.3 J and
to carry out single-frequency and four-frequency generation regime with the pulse
energy of 10
−3 J and with the pulse power of about 0.1 mW. These changes made it
appropriate for the purposes of holography and resonance interferometry.
Spectogram where the spectra of two pulses were sequentially fixed during the
generation wavelength tuning through grating rotation is shown in Fig. 1.2. In this
case, maximal generation energy is 0.006 J.
For further generation spectrum narrowing into the Rhodamine 6G laser, the
Fabry–Perot interferometer (9) with the basis of 100 μm (free spectral range is
1.8 nm) was included, the mirrors of which had dielectric covers with the reflection
index of 70%. Great dispersion of the Fabry–Perot interferometer equal to 1.8 nm
provides narrowing of generation lines up to 0.01–0.03 nm that corresponds to the
Fig. 1.2 Generation spectra of rhodamine 6G dye laser with laser pumping: a the non-selective
resonator (the mirrors are R = 100%, R = 60%, the resonator length is 20 cm); b selective resonator
(the diffraction grating, the exit mirror is R = 60%); c selective resonator (the diffraction grating, the
exit mirror is R = 60%, Fabry–Perot interferometer, four impulses with Fabry–Perot interferometer
sequential slope); d four-frequency generation mode. Reprinted from [54] with permission