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Signal beam

About: Signal beam is a research topic. Over the lifetime, 1881 publications have been published within this topic receiving 20717 citations.


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Patent
21 Sep 1999
TL;DR: In this article, a four-wave mixing optical system and an atomizer chamber are used to perform highly sensitive spectroscopic measurements in a sample vapor by using a laser tunable to generate a laser beam at a desired wavelength corresponding to an absorption line in the sample vapor.
Abstract: Devices and techniques for performing highly-sensitive spectroscopic measurements in a sample vapor by using a four-wave-mixing optical system and an atomizer chamber. One embodiment of a spectrometer comprises a gas-phase atomizer having an atomizer chamber operable to vaporize a sample solution to produce a sample vapor, first and second alignment templates having apertures to align a probe beam, first and second pump beams to form a four-wave mixing configuration, a laser tunable to generate a laser beam at a desired wavelength corresponding to an absorption line in the sample vapor, and a set of optical elements disposed relative to the laser and the atomizer to split the laser beam into the probe beam, the first pump beam, and the second pump beam. The probe beam, the first and second pump beams are directed to overlap with one another in the sample vapor to produce a signal beam through a four-wave mixing process.

9 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the interaction between two strong pump beams and two signal beams and showed that the frequencies of the beams need to satisfy the relation that the sum of the pump beam frequencies should be equal to the total of the signal beam frequencies.
Abstract: The interaction between two strong pump beams and two signal beams is investigated both theoretically and experimentally. It is shown that the frequencies of the beams need to satisfy the relation that the sum of the pump beam frequencies should be equal to the sum of the signal beam frequencies. The gain is shown to depend on the detuning of the pump beams relative to the incident signal beam and on the direction of the signal beam. Maximum gain is obtained when the signal beams bisect the pump beams.

9 citations

Journal ArticleDOI
TL;DR: A single-beam directional multiplexing method using a holographic encoding technique, which is more stable, miniaturized, and flexible, should be of great interest for applications in signal encryption as well as for high-capacity data storage.
Abstract: We propose a novel method for signal storage and encryption, called single-beam multiplexing encoding. The single beam is composed of an inside signal beam and an outside reference beam. The signal beam is amplitude modulated, and the reference beam is phase modulated. The dual modulation is implemented by a spatial light modulator (SLM). Multiplexing holography with different reference beams from different directions, called directional multiplexing, is analyzed in detail. With an SLM based on a twisted nematic liquid crystal display, we demonstrate a single-beam directional multiplexing method using a holographic encoding technique, and the retrieved signals are presented. This encoding system is more stable, miniaturized, and flexible. It should be of great interest for applications in signal encryption as well as for high-capacity data storage.

9 citations

Journal ArticleDOI
TL;DR: In this article, the effect of the phase fluctuation of the pump and signal beams at the output surface fluctuates in time around a mean value, which can be minimized by using a positive feedback method of a pump beam.

9 citations

Patent
03 Feb 2005
TL;DR: In this article, the authors proposed a method to obtain an optical fiber amplifier which can control the wavelength characteristic of a gain so as not to be varied from an initial condition even when the wavelength of signal light beam is varied.
Abstract: PROBLEM TO BE SOLVED: To obtain an optical fiber amplifier which can control the wavelength characteristic of a gain so as not to be varied from an initial condition even when the wavelength of signal light beam is varied. SOLUTION: An excited light beam is inputted from the signal beam output side of a fiber 6 for amplification, an output light beam l1 to the signal beam input side from the fiber 6 for amplification is branched, and wavelength adjusting information d2a to d2n for keeping the optical level of the branched light beam l2 to a constant level are supplied to the wavelength adjusting means 3a to 3n. Therefore, the signal beam is not almost included in the output light beam l1 to the signal beam input side from the fiber 6 for amplification. It is also possible from the optical level of the naturally radiated light beam and the excited light beam to control so that the wavelength characteristic of a gain is kept within the initial condition. Accordingly, the optical fiber amplifier having excellent expandability can be obtained even when the wavelength of the signal beam is varied without taking into account the wavelength of the signal beam in the control of the wavelength characteristic of the gain. COPYRIGHT: (C)2005,JPO&NCIPI

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202215
202131
202040
201929
201844