We explore the potential of Nd:YAG single-crystal fibers for the amplification of passively Q-switched microlasers operating below 1 ns. Different regimes are tested in single or double pass configurations. For high gain and high power amplification this novel gain medium provided average powers up to 20 W at high repetition rate (over 40 kHz) for a pulse duration of 1 ns. As an energy amplifie...

We demonstrate a technique for frequency measurements of atomic transitions with a precision of 30 kHz. The frequency is measured using a ring-cavity resonator whose length is calibrated against a reference laser locked to the D2 line of Rb, the frequency of which is known to 10 kHz. We have used this to measure the hyperfine structure in the 5P3/2 state of Rb. We obtain precise values for the ...

Binary colloidal suspensions are assembled into planar superlattices using ac electric fields. Either triangular or square-packed arrays form, depending on the frequency and relative particle concentrations. The frequency dependence is striking since superlattices develop at low and high frequencies but not at intermediate frequencies. We explain the low frequency behavior (<3 kHz) in terms of ...

We report efficient noncollinear optical parametric amplification (NOPA) of ultrabroadband near-IR pulses tunable in the 1.1-1.5 μm range at a repetition rate of 250 kHz. Improved generation of smooth near-IR continua (extending over ~1.0-1.6 μm) at 250 kHz was achieved by weakly focusing ~20% of the 1 W driving laser beam into a sapphire plate with longer focal length lenses than previously re...

This paper reports on an active 16 x 16, low-noise, low-power, multi-electrode array (MEA) neural sensor chip designed in IBM BiCMOS 8HP 0.13μm process with a total gain of 60 dB per input, a 20 kHz sample rate, an input-referred noise of 5.3 Vrms over 10 Hz to 10 kHz and a total power dissipation of 15.8 mW, or 61.7 W per channel. A C4 microelectrode is attached to the input of each amplifier ...

With the avai lability today of high performance operation al a mplifie rs and r elated co mpone nts, it is poss ible to co ns truct an ins trume nt for ac-dc transfer work that meets t.he requlre~e nt s of a s tandards labora tory. Transformation of meas ured average a-c values Into doc .volt.age IS possIble wIth a predI ctable accuracy of 20 parts per million up to 1 kHz. PrecIsIon of opera t...

OBJECTIVES/HYPOTHESIS To study the prevalence and usefulness of audiometric notches in the diagnosis of noise-induced hearing loss (NIHL). STUDY DESIGN Audiograms and data on noise exposure from 23,297 men and 26,477 women, aged 20 to 101 years, from the Nord-Trøndelag Hearing Loss Study, 1996-1998. METHODS The prevalence of four types of audiometric notches (Coles, Hoffman, Wilson) and 4 k...

The hypersonic effect is a phenomenon in which sounds containing significant quantities of non-stationary high-frequency components (HFCs) above the human audible range (max. 20 kHz) activate the midbrain and diencephalon and evoke various physiological, psychological and behavioral responses. Yet important issues remain unverified, especially the relationship existing between the frequency of ...

The traditional low-pass ZA analog-to-digital converter is extended to the bandpass case. For input signals with small relative bandwidths, bandpass !ZA converters offer high signal-to-noise ratios at significantly lower sampling rates tban are required for low-pass XA converters. A sixth-order single-ended switched-capacitor circuit, clocked at 3 MHz, is designed to convert bandpass signals ce...

Only a small fraction of the high-dimensional parameter space that governs the occurrence of stable single-bubble sonoluminescence (SBSL) has been explored so far. We predict that decreasing the acoustic driving frequency f upscales SBSL. More specifically, at f ­ 5 kHz we expect more than 100 times as many photons per flash as at f ­ 20 kHz and a flash width of about 1000 ps. The application o...