Laser-dye-doped-DNA-CTMA-PMMA hybrid films have been studied as a potential material for waveguide type
thin-film laser devices. For the purpose of evaluate improving processability, not only optical characteristics of the
fluorescence intensity and ASE spectrum but also moisture resistance of the hybrid film have been investigated. It is
found that optical characteristics of those films are equally matched to the conventional laser-dye-doped- DNA-CTMA
films with better moisture resistivity.
Because the fluorescence from organic dye is enhanced when it is intercalated or bound to DNA double strands, a lot of studies on optical amplification and lasing have been made. In this study, we investigated the optical and lasing properties of several cyanine dyes incorporated in DNA in solution and complex films. At first, we confirmed that the addition of DNA into dye solutions strongly enhances the fluorescence intensity, and also affects the degree of molecular aggregation. We fabricated the films composed of DNA, dye, and lipid by two methods, and observed the amplified spontaneous emission (ASE) under the excitation of 532 nm laser pulses with sub-mJ energy. We also made a thin film DFB dye laser by forming DNA/dye/lipid films on a grating plate, from which a laser action was observed under optical pumping.
A moire pattern appears when two or more periodic patterns are superimposed with a small rotation angle. We focused on this phenomenon and fabricated moiré gratings by an "etchless" process. This process utilizes two-beam interference exposure with a He-Cd laser to fabricate holographic gratings quickly and at low cost. Experimental results show that the moire gratings had a diffraction efficiency sufficient to allow them to serve as resonators for DFB solid-state dye lasers. We then prepared a DFB solid-state dye laser device with moire gratings and pumped the device with a second harmonic generation (SHG) of a Nd:YAG laser. This resulted in narrow-banded DFB laser oscillation in the red wavelength region.
Solid-state dye lasers have been developed as compact and easy-to-handle coherent light sources. In particular, distributed feedback (DFB) solid-state dye lasers are able to emit narrow-banded single-mode laser beams. In DFB lasers, the diffraction grating is a key device for selecting the laser oscillation wavelength from a fluorescent band of organic dye. We adopted an "etchless process" and fabricated gratings for DFB solid-state dye lasers quickly and at low cost. In this study, we attempted to fabricate a multi-beam DFB solid-state dye laser combining pitch-different gratings and dye-doped silica xero-gel. We succeeded at obtaining narrow-banded triple-beam laser oscillations in the same optical axis with the three-wavelength DFB solid-state dye laser device.
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