Topic
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•
18 Oct 2005
TL;DR: In this article, a light source generates a reference beam, a holographic optical element saves a plurality of interference patterns between the reference beam and a multiplicity of beams of specific sizes, and a beam splitter splits each reproduced beam into a Holo-Signal and Holo-Reference beam.
Abstract: In a holographic digital data storage system, a light source generates a reference beam, a holographic optical element saves a plurality of interference patterns between the reference beam and a plurality of beams of specific sizes and a beam splitter splits each reproduced beam into a holographic signal beam and a holographic reference beam. A medium records an interference pattern between the holographic reference beam and the holographic signal beam and reflecting the holographic reference beam to generate a reflective information beam and, if only the holographic reference beam is illuminated, a displaying means displays a holographic reproduced beam for the holographic signal beam and detecting the reflective information beam.
12 citations
TL;DR: In this article, a multiport coherent optical detection scheme was proposed which can simultaneously measure phase and amplitude of a signal beam using a scanning interferometer arrangement, which can be used not only for locating defects on the surface but also for identifying the nature of defects.
12 citations
TL;DR: In this article, an experimental technique for efficient 2-μm light generation based on the intracavity noncritical phase matching optical parametric oscillator (OPO) was proposed.
Abstract: We propose an experimental technique for efficient 2- μm light generation based on the intracavity noncritical phase matching optical parametric oscillator (OPO). Intra-cavity pumped by a diode pumped actively Q-switched Nd:YVO4 laser operating at 1.3 μm, we have achieved efficient 2093-nm signal beam emission making full use of noncritical phase matching KTA-OPO. At a diode pump power of 9.8 W and a Q-switching repetition rate of 30 kHz, a signal beam with a spectral linewidth of ~ 1 nm and an average power of 1.01 W have been obtained, giving a diode pump power to signal power conversion efficiency of 10.3%. The short pulse width of ~ 3.4 ns is achieved, which is much shorter than other approaches with Q-switched operation to generate 2-μm laser beams.
12 citations
TL;DR: In this paper, the optical amplification properties of dysprosium doped Gd2SiO5, Lu2SiOsO5 and YAl3(BO3)4 single crystals were compared in a pump-and-probe experiment.
Abstract: Comparative investigation of the optical amplification properties of dysprosium doped Gd2SiO5, Lu2SiO5 and YAl3(BO3)4 single crystals was performed in a pump-and-probe experiment. High power laser pulses at 475 nm were used as the pump source in order to strongly populate the 4F9/2 level of the Dy3+ ions due to ground state absorption. Low signal beam cw radiation at 574 nm was used as the probe beam to stimulate the emission associated with the 4F9/2→6H13/2 electronic transition of the Dy3+ ions. The process was modelled as a three levels system, and their populations were analysed and simulated in order to study the gain dynamics. Positive optical gain was observed and compared in these crystals. These results confirmed that among the systems studied the Dy3+-doped YAl3(BO3)4 single crystal can be considered as a good candidate to develop an optical amplifier employing the 4F9/2→6H13/2 transition at around 574 nm which is the first step to consider as laser active media.
12 citations
TL;DR: In this paper, two-dimensional holographic photovoltaic bright spatial solitons are observed in a Cu:K0.25Na0.75Sr1.5Ba0.15 crystal in which two coherent laser beams, a signal beam, as well as a strong and uniform pump beam at 532nm are coupled to each other via two-wave mixing.
Abstract: Two-dimensional holographic photovoltaic bright spatial solitons are observed in a Cu:K0.25Na0.75Sr1.5Ba0.5Nb5O15 crystal in which two coherent laser beams, a signal beam, as well as a strong and uniform pump beam at 532nm are coupled to each other via two-wave mixing. Such solitons originate from the self-trapping of the signal beam due to both photovoltaic effects and holographic focusing effects.
12 citations