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The emission of rhodamine 6G and 2,5-bis(2-benzoxazolyl)hydroquinone molecules embedded in synthetic opal photonic crystals are studied in the spectral range of 520-620 nm. It is found that the intensity of spontaneous emission is suppressed in the spectral region corresponding to the photonic stop band and is amplified on its "blue" side. PACS:78.67-n, 78.55.Mb UDC: 535.361

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We demonstrate an integrated tunable coupled-cavity InGaN/GaN laser with the emission wavelength centered on 409 nm. The electronic tuning range was 1.6 nm and threshold currents were 650 mA per cavity for 8.7-μm-wide laser ridges. Multimode laser emission with an average full width at half maximum of 0.3 nm was observed. We estimate the refractive index change due to free-carrier injection and optical gain to explain the experimental tuning range