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Terahertz (THz) waves at 9.7, 10.1 and 10.6 THz were generated via difference frequency generation in high-quality InxG1-xaSe mixed crystals with a relatively high indium compositions (x = 0.040, 0.048, 0.074) grown from an indium flux. The phase-matching angle for THz wave generation was measured for each indium content. As a result, it is confirmed that the incident angle of the excitation light satisfying the phase-matching condition is shifted to a higher angle with an increase in the indium content.

In x Ga 1Àx Se mixed crystals have been successfully grown from an indium flux by the traveling heater method at three growth temperatures. The thickness of the grown In x Ga 1Àx Se mixed crystal perpendicular to (001) was more than 3 mm. The lattice constant, and optical and electrical properties of the In-x Ga 1Àx Se mixed crystals and undoped GaSe crystals were investigated and compared. The indium content of the In x Ga 1Àx Se mixed crystals was observed to increase with decreasing growth temperature, while the lattice constant along the c-axis was observed to follow Vegard's law. It was confirmed that a bandgap of In 0.020 Ga 0.980 Se is narrower than that of undoped GaSe according to the photoluminescence (PL) spectra. Compared with undoped GaSe crystal, the carrier concentration p was decreased by the incorporation of indium (In 0.020 Ga 0.980 Se, p = 6.4 9 10 14 cm À3 at 257 K; In 0.037 Ga 0.963 Se, p = 2.6 9 10 14 cm À3 at 257 K). In addition, it was suggested that the dominant carrier scattering mechanism of high-indium-content crystals at low temperature is ionized impurity scattering.

Cavernous malformation (CM) is a type of vascular malformation that is an important cause of intracerebral hemorrhage. However, because CM is a low-flow vascular malformation, the occurrence of major hemorrhage is rare. We present two patients with deep ganglionic intracerebral hemorrhage that caused a significant mass effect, mimicking hypertensive hemorrhage. In both cases, we performed evacuation of the hematoma as a lifesaving treatment and made a pathological diagnosis of CM. In conclusion, preoperative diagnosis of CM using any kind of radiological evaluation is difficult, especially in patients with major hemorrhage. The possibility of CM should be remembered in cases with deep ganglionic intracerebral hemorrhage.