High-Performance All-Organic DFB and DBR Waveguide Laser with Various Grating Height Fabricated by a Two-Photon Absorption DLW Method

Tsutsumi, Naoto; Kaida, Keiichi; Kinashi, Kenji; Sakai, Wataru

doi:10.1038/s41598-019-47098-4

Cited by 12 publications

(6 citation statements)

References 19 publications

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“…Early OSSLs were realized by bulk optics 24 , but soon alternative designs have been developed. For example, vertical emission has been realized with vertical cavity surface-emitting lasers (VCSELs) 25–27 , vertical external cavity surface-emitting organic laser (VECSOL) 28 , and Bragg gratings 17,22,29–31 . However, the in-plane emission of the laser radiation into planar waveguides is a prerequisite for the application as an integrated light source in PIC devices.…”

Section: Introductionmentioning

confidence: 99%

Slot-Waveguide Silicon Nitride Organic Hybrid Distributed Feedback Laser

Vogelbacher

Sagmeister

Kraft

et al. 2019

Sci Rep

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One of the major barriers for a widespread commercial uptake of silicon nitride photonic integrated circuits for cost-sensitive applications is the lack of low-cost monolithically integrated laser light sources directly emitting into single-mode waveguides. In this work, we demonstrate an optically pumped organic solid-state slot-waveguide distributed feedback laser designed for a silicon nitride organic hybrid photonic platform. Pulsed optical excitation of the gain medium is achieved by a 450 nm laser diode. The optical feedback for lasing is based on a second-order laterally coupled Bragg grating with a slot-waveguide core. Optimized material gain properties of the organic dye together with the increased modal gain of the laser mode arising from the improved overlap of the slot-waveguide geometry with the gain material enable single-mode lasing at a wavelength of 600 nm. The straightforward integration and operation with a blue laser diode leads to a cost-effective coherent light source for photonic integrated devices.

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Section: Introductionmentioning

confidence: 99%

Slot-Waveguide Silicon Nitride Organic Hybrid Distributed Feedback Laser

Vogelbacher

Sagmeister

Kraft

et al. 2019

Sci Rep

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“…21−29 The dependence of the grating height and pitch on the lasing threshold and the slope efficiency has been investigated for DFB and distributed Bragg reflector (DBR) waveguide laser devices based on rhodamine 6G (R6G) dyes dispersed in cellulose acetate (CA). 30,31 In a previous report, 32 we found that for DFB and DBR organic dye lasers, the preserved fluorescence emission and the enhanced slope efficiency for laser emission for R6G dye dispersed in a CA matrix were induced by the insertion of an intermediate layer consisting of a copolymer of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) (P(VDF-TrFE)) between the waveguide layer and quartz substrate. The enhancement is considered to originate from the suppression of fluorescence concentration quenching by the introduction of polar crystals into the P(VDF-TrFE) intermediate layer.…”

Section: ■ Introductionmentioning

confidence: 98%

“…These approaches promise the suppression of aggregation-induced fluorescence quenching. Dendrimers and starburst polymers are a good option to prevent π–π stacking of phenyl rings in molecules. − The dependence of the grating height and pitch on the lasing threshold and the slope efficiency has been investigated for DFB and distributed Bragg reflector (DBR) waveguide laser devices based on rhodamine 6G (R6G) dyes dispersed in cellulose acetate (CA). , …”

Section: Introductionmentioning

confidence: 99%

Enhancement of Amplified Spontaneous Emission and Laser Performance of Rhodamine 6G/Cellulose Acetate DFB and DBR Waveguide Devices: A Role of Thermally Annealed P(VDF-TrFE) Intermediate Layer

Tsutsumi

Hirano

Kinashi

et al. 2020

ACS Appl. Electron. Mater.

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Inserting a crystalline P(VDF-TrFE) intermediate layer under rhodamine 6G (R6G) laser active waveguide layer preserved the emissive R6G molecules in the matrix, which increases the intensity of fluorescence of R6G dye in the matrix and thus enhances the laser performance, including the optical gain of amplified spontaneous emission (ASE). The thermal annealing of the intermediate layer of P(VDF-TrFE) affects the optical gain of ASE and the laser performance in terms of slope efficiency and the threshold for the R6G/CA waveguide laser devices with DFB and DBR structures. With a higher annealing temperature, the crystallinity, crystallite size, and thus surface roughness of the P(VDF-TrFE) layer were increased; simultaneously, the fluorescence intensity, the optical gain of ASE, and the slope efficiency were increased, and the threshold for lasing was reduced. Thermal annealing of P(VDF-TrFE) at 120 °C gave a higher crystallinity, larger crystallite size, and thus deeper surface roughness. A DBR laser device with m = 2 mode number gave a slope efficiency of 4.6% and the optical gain of ASE of 13.0 cm–1. The deeper roughness of the surface due to the larger polar β-crystallites of P(VDF-TrFE) was significantly related to the increased intensity of fluorescence, optical gain of ASE, and slope efficiency for laser emission and the reduced threshold for lasing. The present approach is the easier way to enhance the lasing performances for ionic laser dyes in industrial applications.

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“…Much of this effort is and has been driven by the prospect of obtaining the long-sought after electrically pumped organic (or hybrid) laser, a device that it is finally becoming a reality [4,5]. In the process of reaching this final goal, many advances have been done in optically pumped devices, either developing new organic, inorganic or hybrid active materials [1][2][3][6][7][8][9][10][11], or optimizing the laser device fabrication and performance [1][2][3][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%