Abstract
A tunable circularly polarized distributed feedback (DFB) laser based on reflection grating configuration was realized in a solution of 4- (dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) doped methanol. Chiral photonic DFB structures with tunable photonic bandgap were generated by controlling the state of polarization of the two interfering pump beams. The dual-peak lasing emission spectrum indicates that the periodic chiral DFB grating is affected by a combination of modulations of gain and refractive index.
Highlights
The distributed feedback (DFB) technique has been intensively employed for achieving tunable lasers since the first DFB laser was pioneered by Kogelnik and Shank [1]
Low-threshold and narrow-linewidth lasing was observed in a photonic bandgap (PBG) structure composed of a dye doped holographic polymer-dispersed liquid crystal (HPDLC) by using holography technique [5]
The circularly polarized DFB laser was first operated in left-handed circularly polarized pumping (LCP):LCP pumping geometry
Summary
The distributed feedback (DFB) technique has been intensively employed for achieving tunable lasers since the first DFB laser was pioneered by Kogelnik and Shank [1]. Instead of the traditional transmission DFB grating geometry, a DFB lasing was achieved in a reflection grating geometry constructed by two interfering pump beams coming from the opposite sides of the sample. Lo’s group reported a detailed experimental investigation of the polarization properties of a DFB lasing output by polarization modulation based on dye doped solutions and dye doped sol-gel waveguides in the conventional transmission pumping geometry [9, 10]. They demonstrated that a transient polarization grating induced by the optical anisotropy of the gain medium resulting from polarization modulation can be used to generate DFB laser action
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