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(a) Photographic picture of the sample cell. Cano dislocation lines are observed with a typical spacing of . (b) The schematic diagram of the wedge cell with the half-turns of helical pitch.
The optical reflection spectra of the stopband (black curve), the fluorescence spectra with the lasing peak (red curve), and the density of mode spectra (dotted curve) are shown. The inset shows the lasing intensity as a function of the pump beam intensity.
The spectra of both lasing wavelength and stopband are shown simultaneously as the pump beam position is translated along the -axis direction.
The peak lasing wavelength is plotted as a function of the pump beam position on the wedge cell.
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