研究目的
To demonstrate a simple 'pick and place' method for mounting organic single crystals onto distributed feedback gratings to achieve efficient lasing, indicating the potential for broad application of the method for making single crystal lasers.
研究成果
The 'pick and place' method successfully fabricates DFB lasers from sub-millimeter-scale 2D organic single crystals, demonstrating narrow single frequency laser emission with reasonable excitation thresholds. This method may pave the way for realizing electrically pumped lasers from organic single crystals.
研究不足
The method's applicability is limited to slightly flexible, high-quality sheet-like organic single crystals that exhibit ASE under pulsed optical pumping. The thickness of the crystals may affect the lasing threshold due to mode competition.
1：Experimental Design and Method Selection:
The study employs a 'pick and place' method to mount organic single crystals onto distributed feedback gratings for lasing. Theoretical models include waveguide simulations and refractive index measurements.
2：Sample Selection and Data Sources:
Three organic fluorescent materials (BDPV2T, DSB-Me, P2T-CF3) were used as gain media, grown by the physical vapor transport method.
3：List of Experimental Equipment and Materials:
UV-NIL for grating manufacture, Q-switched diode pumped solid-state laser at 355 nm for excitation, SEM for imaging, and a homemade Fourier imaging microscope for refractive index measurements.
4：Experimental Procedures and Operational Workflow:
Crystals were picked up by a fine brush and placed on grating structures. Emission spectra were recorded under pulsed optical pumping.
5：Data Analysis Methods:
Angle-resolved PL measurements, waveguide simulations using FEM, and analysis of lasing thresholds and emission spectra.
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