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AFM measurements of the SRG period and amplitude. Inset shows two-dimensional image of the SRG inscribed in a liquid crystalline photochromic polymer.
Schematic view of the thin film DFB laser structure prepared on a glass plate. The photochromic polymer with SRG is covered from the top by the biopolymeric matrix of DNA-CTMA containing Rh6G.
Experimental setup for measurements of lasing and ASE. , pulse width 6 ns, and pulse repetition frequency 11 Hz.
Examples of the lasing and ASE signals measured for the excitation energy density , , pulse width 6 ns, and pulse repetition frequency 11 Hz. Inset shows excitation and emission spectra of fluorescent dye Rh6G in DNA:CTMA matrix.
Peak intensities for different excitation energy densities in the case of DFB lasing and ASE. The laser threshold lies at pump energy density equal to 1.8 and for ASE.
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