Results 261 to 270 of about 359,935 (314)
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Frequency-modulated Nd:YAG laser
Optics Letters, 1991A frequency-modulated, single-mode Nd:YAG laser has been constructed that tunes up to 12 GHz. The laser incorporates a LiTaO(3) electro-optic phase modulator with acoustic damping to provide a tuning sensitivity of 12 MHz/V and linear voltage-to-frequency conversion. A frequency excursion of 1.2 GHz has been generated with a rise time of 0.6 ns.
P A, Schulz, S R, Henion
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Frequency-modulation-polarization spectroscopy
Optics Letters, 1983We have combined frequency-modulation and polarization spectroscopy to detect anisotropic spectral features with high sensitivity. The many line shapes possible with this technique and the potential for laser noise suppression were demonstrated by using saturation holes in iodine vapor.
M, Romagnoli +2 more
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Low frequency photoelastic modulator
Applied Optics, 1984In this paper, we propose a new excitation mode of a photoelastic modulator previously shown to perform low frequency polarization modulation. Photoacoustic and photothermal polarization spectroscopy is possible with this modulation scheme which has the specific advantages of large light throughput and freedom from mechanical vibrations.
J C, Canit, C, Pichon
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Research of frequency modulation to amplitude modulation with multi-frequency modulation
SPIE Proceedings, 2013ABSTRACT For better performance of laser coupling in inertial confinement fusion (ICF), beam shaping of the focus spot is required. Among all the beam smoothing methods, the multi frequency modulation smoothing by spectral dispersion (MultiFM-SSD) proposed by LLE has the advantages of the faster smoothing and better operability.
Yuliang Zhou +5 more
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Double frequency modulation spectroscopy: high modulation frequency with low-bandwidth detectors
Applied Optics, 1985In this paper, we describe experimental and theoretical investigations of two variations of frequency modulation (FM) spectroscopy that use two electrooptic modulators. In the first variation, both modulators are frequency modulators (FM–FM), and, in the second, one is a frequency modulator and one is an amplitude modulator (FM–AM).
D E, Cooper, T F, Gallagher
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The Journal of the Acoustical Society of America, 1994
The encoding mechanisms for amplitude modulation (AM) and frequency modulation (FM) were investigated using AM–FM discrimination tasks. In the first experiment, AM and FM were set at equally detectable levels within a trial, and discrimination thresholds were obtained adaptively in a 3IFC task.
B W, Edwards, N F, Viemeister
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The encoding mechanisms for amplitude modulation (AM) and frequency modulation (FM) were investigated using AM–FM discrimination tasks. In the first experiment, AM and FM were set at equally detectable levels within a trial, and discrimination thresholds were obtained adaptively in a 3IFC task.
B W, Edwards, N F, Viemeister
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Modulated High‐Frequency Waves
Studies in Applied Mathematics, 1990We construct asymptotic approximations to solutions of nonlinear hyperbolic conservation laws, when the initial data is small‐amplitude high‐frequency waves with modulated wave number. We show that the nonlinear multiwave interaction terms approach zero in the asymptotic limit, so that the wave components satisfy decoupled Burgers equations, provided a
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