Abstract
Phase sensitive second harmonic microscopy (PS-SHM) is applied to different nonlinear optical crystals such as N,N-dimethyl-2-acetamido-4-nitroaniline (DAN), 2-cyclo-octylamino-5-nitropyridine (COANP), a channel-type inclusion compound of perhydrotriphenylene (PHTP)/N,N-dimethyl-3-nitroaniline (DMNA), potassium dihydrogen phosphate (KH2PO4) crystals stained by amaranth, and the zeolite AlPO4-5 loaded by 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM). Present experiments show that phase sensitive experiments can be performed using a sufficiently flat surface of samples irrespective of their thickness. The new application of PS-SHM reveals a bipolar state in stained KH2PO4 and dye-loaded AlPO4-5.
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