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Optical modulator
About: Optical modulator is a research topic. Over the lifetime, 14068 publications have been published within this topic receiving 196932 citations.
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TL;DR: In this article, a two-phase-only liquid crystal spatial light modulators (LC-SLMs) were designed to convert a quasi-Gaussian beam into a flat-top beam.
Abstract: A system containing two-phase-only liquid crystal spatial light modulators (LC-SLMs) is designed to convert a quasi-Gaussian beam into a flat-top beam. The first LC-SLM redistributes the intensity and the second LC-SLM re-collimates the reshaped beam. The phase distributions of the LC-SLMs are derived based on energy conservation and the constant optical path length principle. The influences of deviations of the beam waist and beam shape from the assumed value are analyzed in detail. Experimental results show that approximately 71.5% of the incident power is enclosed in a region with less than 6% rms power variation. The performance is compared quantitatively with the theoretical design. The far-field intensity distribution and the phase distribution of the reshaped beam show that the wavefront after reshaping is maintained.
50 citations
TL;DR: In this paper, the first measurements of dynamic spectra of an InGaAsP/InP light modulator under high-frequency large-signal modulation were reported, and a spectral broadening factor was determined from the relative sideband strength to the carrier, and it decreased with increasing operating electric field in the modulator.
Abstract: The first measurements of dynamic spectra of an InGaAsP/InP electroabsorption light modulator under high-frequency large-signal modulation are reported. A spectral broadening factor ? was determined from the relative sideband strength to the carrier, and it decreased with increasing operating electric field in the modulator. The estimated ?-value for full modulation was |?| = 2.3, which can be reduced by designing a modulator to give a more effective change of electro-absorption.
50 citations
TL;DR: In this paper, a few-layer MXene Ti3C2Tx was fabricated and utilized as a saturable absorber (SA) to realize passive Q-switched visible bulk laser covering the spectral range of orange (607nm), red (639nm), and deep red (721 nm).
Abstract: The novel two-dimensional MXenes have been investigated in the photonics field in areas such as broadband nonlinearity, pulse laser generation and passive photonic diode, and so on. In this contribution, the nonlinear optical response at the visible band and the demand pulse laser generation based on MXenes was initially realized. The few-layer MXene Ti3C2Tx was fabricated and utilized as a saturable absorber (SA) to realize passive Q-switched visible bulk laser covering the spectral range of orange (607 nm), red (639 nm), and deep red (721 nm). At the three wavelength, the maximum average output powers and the shortest pulse widths were (111 mW, 426 ns) for 607 nm, (150 mW, 264 ns) for 639 nm, (115 mW, 328 ns) for 721 nm, respectively. Our experimental results indicate the MXene Ti3C2Tx SA could be an efficient and promising optical modulator in the visible domain.
50 citations
01 May 1965
TL;DR: In this paper, an optical amplitude modulator with a bandwidth of approximately one Gc/s and requiring about a fifty-volt drive to produce a 100 per cent amplitude modulation was constructed by using the traveling-wave approach previously used in the gigacycle bandwidth phase modulator.
Abstract: We have constructed an optical amplitude modulator having a bandwidth of approximately one Gc/s and requiring about a fifty volts drive to produce a 100 per cent amplitude modulation. The wide-bandwidth low drive power performance is obtained by using the traveling-wave approach previously used in the gigacycle bandwidth phase modulator. The electro-optic material is KDP cut in the same orientation used in the phase modulator and combined with other optical elements to produce retardation-amplitude modulation. Temperature variations through the KDP produce a deflection and decollimation of the output beam. Experiments have been conducted to determine the magnitude of these effects. Corrective measures have been devised. Comparatively good agreement between the computed and the measured bandwidth has been obtained.
50 citations
TL;DR: In this paper, the effects of both varying the alignment films and the operating conditions on the dynamic characteristics of liquid-crystal spatial light modulators (LC-SLMs) have been investigated.
Abstract: The effects of both varying the alignment films and the operating conditions on the dynamic characteristics of liquid-crystal spatial light modulators (LC-SLMs) have been investigated The optimum operating conditions of LC-SLMs have been determined, and a proper choice of alignment films has been made To interpret the high speed obtained for polyimide systems retaining their high resolution, a simulation of speed enhancement has been proposed
50 citations