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A uniform size liquid microdroplet generator was fabricated with glass orifice. The orifice of the generator was made as small as 5 μm on a Pyrex tube. The size of the uniform ethanol droplets generated by the 5 μm orifice varied from 19 to 14 μm as the driving frequency changed from 150 to 400 kHz. Operation characteristics of this generator were comparable to those of the commercial devices. We also measured the interdroplet separation with the diffraction pattern of the array of droplets in order to get the velocity of droplet stream at various stream positions and driving frequencies. The deceleration of droplet stream was nearly independent of the driving frequency which determines the droplet size and interdroplet separation.

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We perform Raman amplification in a high-pressure methane cell seeded by a low-threshold liquid Raman oscillator. The Raman frequency of the oscillator medium, dimethyl sulfoxide (DMSO), is tuned when it is mixed with water to fit the Raman frequency of methane. The Raman gain in this configuration is not so sensitive to the methane pressure, and the conversion efficiency is high. Using this configuration, we measure the polarization dependence of the Raman amplifier. An experiment is performed for three typical polarization states. Complete gain suppression is expected in some polarization states, but there is a little gain because of the incompleteness of the polarization state. Theoretically the results are analyzed when the x and the y components of the scattered waves are coupled.