Direct inversion methods for spectral amplitude modulation of femtosecond pulses

Delgado-Aguillón, Jesús; Garduño-Mejı́a, Jesús; López-Téllez, Juan Manuel; Bruce, Neil C.; Rosete-Aguilar, Martha; Román-Moreno, Carlos J.; Ortega-Martı́nez, R.

doi:10.1063/1.4870282

Review of Scientific Instruments

2014

DOI: 10.1063/1.4870282

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Direct inversion methods for spectral amplitude modulation of femtosecond pulses

Jesús Delgado-Aguillón

Jesús Garduño-Mejı́a

Juan Manuel López-Téllez

et al.

Abstract: In the present work, we applied an amplitude-spatial light modulator to shape the spectral amplitude of femtosecond pulses in a single step, without an iterative algorithm, by using an inversion method defined as the generalized retardance function. Additionally, we also present a single step method to shape the intensity profile defined as the influence matrix. Numerical and experimental results are presented for both methods.

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Cited by 3 publications

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Experimental method to characterize the retardance function of optical variable retarders

López-Téllez¹,

Bruce²,

Delgado-Aguillón³

et al. 2015

American Journal of Physics

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In this work, we present an experimental method to characterize variable optical retarders, which can have linear or non-linear behavior of the retardance variation. A theoretical analysis of such is presented using a combination of Stokes vectors and Mueller matrixes for three different optical retarders. A straightforward method for phase unwrapping, or reconstructing the original phase from the measured retardance, is proposed that yields high-accuracy results. This work can be used in an undergraduate optics lab to help students understand the concepts of retardance and its control and also how variable retardance devices work.

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Experimental method to characterize the retardance function of optical variable retarders

López-Téllez¹,

Bruce²,

Delgado-Aguillón³

et al. 2015

American Journal of Physics

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Characterization of retardance spatial variations over the aperture of liquid-crystal variable retarders

et al. 2021

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We present a comparison of two experimental methods to measure retardance as a function of applied voltage and as a function of position over the aperture of liquid-crystal variable retarders. These measurements are required for many applications, particularly in polarimetry. One method involves the scan of an unexpanded laser beam over the aperture, and the other uses an expanded beam from a LED and a CCD camera to measure the full aperture with a single measurement. The first method is time consuming, is limited in the measured spatial resolution, and requires more expensive equipment to perform the scan, whereas the second method is low cost, with the spatial resolution of the CCD, and fast, but in principle has variations of the incident beam over the aperture that affect the measured retardance values. The results obtained show good agreement for the average values of retardance for the two methods, but the expanded-beam method shows more noise, particularly close to the voltage values at which the variable-retarder retardance versus voltage curves are unwrapped. These retardance variations can be reduced by smoothing the retardance image, which makes the expanded-beam method an attractive method for polarimetry applications since it gives the complete information in the full aperture of the device with the additional advantages of low cost, simplicity, and being less time consuming.

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Characterization of optical polarization properties for liquid crystal-based retarders

2016

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We present the analysis and implementation of a set of experimental procedures to characterize optical polarization properties as a function of the applied voltage for liquid-crystal variable retarders (LCVRs) in the transmission mode. The studied properties are those involved in the operation of the LCVRs and, generally, are the most significant for optical applications: retardance, diattenuation, optical axes position, and output depolarization effects. The correct characterization of these polarization properties can be useful to improve results or estimate errors in applications using these devices. The results obtained show good accuracy and good agreement with the expected results.

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Direct inversion methods for spectral amplitude modulation of femtosecond pulses

Cited by 3 publications

References 12 publications

Experimental method to characterize the retardance function of optical variable retarders

Experimental method to characterize the retardance function of optical variable retarders

Characterization of retardance spatial variations over the aperture of liquid-crystal variable retarders

Characterization of optical polarization properties for liquid crystal-based retarders

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