Single-mode lasing from dye-doped holographic polymer-dispersed liquid crystal transmission gratings

Re-evaluation of all-plastic organic dye laser with DFB structure fabricated using photoresists

“…In the past two decades, organic solid-state lasers (OSSLs) 1 2 3 4 5 6 7 8 9 10 11 12 13 have been developed extensively because of the easy fabrication of laser devices by spin-coating or solution casting, the low cost of device fabrication, and the wide variation of the lasing wavelength, ranging from the visible to near infrared regions, that can be selected depending on the laser dye used. Slope efficiency is an important measure to evaluate the performance of the laser devices.…”

High conversion efficiency distributed feedback laser from a dye-doped holographic transmission grating

“…The lasers emitted from sample a and sample b located at 645.1 nm and 645.8 nm with the FWHM of 0.5 nm and 0.4 nm, respectively. To date, there are only two reports on the conversion efficiency for the laser from dyedoped HPDLCs, which are around 0.1% and 0.8% [15,23]. We attributed the improvement of conversion efficiency to several aspects.…”

“…When lasing dye is doped in this DFB structure, a micro-miniature organic dye laser was formed and it can be pumped by Nd:YAG laser or laser diodes which show the potential to be integrated in all optical devices [5]. Furthermore, the lasing wavelength from dye-doped HPDLC can be controlled precisely by a thermal or electrical method due to the large optical and dielectric anisotropies of LCs [14,15]. Undoubtedly, this packaged multifunctional dye-doped organic laser will be widely used in the future.…”

“…Therefore, only refractive index spatial modulation exists in the structure and gain modulation can be neglected. Different from previous reports [14][15][16][17], only a low functional monomer was used and the rubbed PI layer was spin-coated on the substrate to control the orientation of the phase separated LCs along the groove direction of HPDLC grating. In this way, the refractive index of the phase separated LCs changed from ordinary refractive index (n o ) to extraordinary refractive index (n e ) for TE polarized light and the refractive index difference between LC and polymer lamellae was increased, thus the light feedback was improved.…”

The Synthesis and Characterization of Spacer-Free Liquid Crystal Polyrotaxane by Virtue of the Mobility of Threaded α-Cyclodextrins

“…Liquid crystalline polymers (LCPs) have been subjected to extensive attention in recent years, owing to their fascinating potential functional applications, such as biomedical materials, photoelectric materials, switches, smart, and stimuliresponsive materials . However, the LCPs always suffered from so‐called “matrix effect,” which restricted the movement of mesogen moieties resulting in the weakening and disappearing of liquid crystalline phase.…”