Lasing in organic circular grating structures

Abstract

Low-temperature lasing action in a metal-backed monosubstituted polyacetyleneOptically pumped organic polymer lasers are fabricated by spin coating a thin polymer film onto a nanopatterned SiO 2 circular-grating surface-emitting distributed Bragg reflector. For certain grating parameters, we observe a peak inside the stop band that leads to lasing with a reduced threshold. An analytical model, based on the transfer-matrix method, has been developed to investigate the origin of this peak. The theoretical results are in good agreement with the experimental findings.

Fabrication of Circular Grating Distributed Feedback Dye Laser by Nanoimprint Lithography

“…The 400 nm groove depth is defined to ensure maximum confinement, whereas the 200 µm overall diameter of the circular grating and the 50% duty cycle are used to reach the maximum coupling strength (A. Jebali et al, 2004).…”

Surface-emitting circular DFB, disk-, and ring-Bragg resonator lasers with chirped gratings III: gain saturation effects and above-threshold analysis

“…Wu et al were the first to experimentally realize such lasers in semiconductors [2]. More recently, organic polymers are also used as the gain medium for these lasers due to their low fabrication cost [3][4][5].…”

Surface-emitting circular DFB, disk- and ring- Bragg resonator lasers with chirped gratings: a unified theory and comparative study

“…Among the various grating coupled schemes, circular grating lasers with large emission apertures possess the additional advantage of producing circularly-symmetric, narrow-divergence laser beams, making them convenient for coupling to fibers [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. In such lasers, the grating serves two purposes: confining the in-plane fields to form a radial resonator and secondly acting as a broadside output coupler.…”