Two approaches of fabricating grating structures for waveguided plastic dye lasers are described and compared for lasing performance. Rhodamine6G-doped poly(methyl methacrylate) (PMMA) film on a PMMA substrate was used for the waveguide, and a distributed-feedback (DFB) laser operation with a single-propagation mode was demonstrated. The performances of both types of permanent grating structured DFB dye laser were better than those of a DFB dye laser on a plain waveguide with a dynamic grating formed by the interference of two pump beams. Wide tuning range is expected by use of a multistripe DFB laser with different grating pitches.

The ah, the diabilihr, the stability and the mst of tunable lasers will be impmved v e q mvch by taking integrated waveguide structure. We have developed 80lid-8tate &+xibuted.feedback @FE9 dye laaera with I dye-doped PMMA waveguide The DPB laser action c m be attained by following two metho& 1) h d -t y p e DFB using photo-etched p t i n g dong the wavepuide, and 2) tvaableDPB urdng Wbeamintersetian ofpumpinghe..How-.e . planer vmvepuide is used in these experiments. Io this paper, we developed multi. shipe wsvsgUide la-. A 3w-hick PMMA that eontaioed l2mM of Rhod-e 6 0 dye was spinetlaled on a PMMA substrate. We fabricated five different multia+xipe l m with width of 5 0 0~~ 1 W w . 50w, 2Ow. end 1 O w where each waveguide had a length of 20" and a separetian d low. Because the chip has e total width of 0.5mm. 50 waveeuides are pallsrelly pdnted iOr IOwwide laser, 26 wave&& for 2Opm.wide laser. and 80 on. These ch&s showed DPB Larer d o n around E" by two-beam inmadion 9 the pvmping laser, a fmspuency-doubled NdYAG h e r with 6ns pulse duration. Spfftral bandwidth is about 0.lom. By rhan-ng the incidence angle of pumping beams, wavelength tuning w a obtained. Io this ease, we pumped the wholo sles d t h e ch&, 80 that we= stripes were simultaneously baed at the same wavelength. %.I shows the threshold e o w of DFB 1 as a function of the stripe width. Far IOilm-wide Lase*, the threshold energy b reduced to d y 400nJlstripe. We can make photoetched grating M u r e in the waveguide, and grsduaUy than& DFB frequency can be etched in each shipe. Using such de-, we shall realize new type of laser spectmscopy shown in Pig.2. Fig-Z(a) is the s p~c u (~~c o p y without ~Q W~C Y sanoing by the combination of e multi-stripe laser and an array detector. Pig.2@) is the mnfgvraiion of pimseemd frequency scao I-.The multi-rtdpe laser is pumped hy a a h o r t p h NdYAG laser giving a h e delay for each stripe In the P-OUS paper. we demonatrated that these DFB dye lasen can generate PS pulseslIl.8O that very rapid &QU-scan light can be generaled by concentrating the output &om each stripe. 111 M.Maeda et d.:IEEEJ.Quant. Elect. 33, 2126 (19973. ~~d e n e r w p e r S + x i p e i n Fig.2 New type of laser spaCoseopy u i h g multistripe laser (a) spectroscopy without frequency xanoiog, 0)wneration ofps ~Q U~O S Y =an k h t multietripe dye Imer

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