Flicker in a twisted nematic spatial light modulator

Calderón-Hermosillo, Yuliana; García-Márquez, Jorge; Espinosa-Luna, Rafael; Ochoa, Noé Alcalá; López, Víctor Manuel Cuesta; Aguilar, Alberto; Noé-Arias, E.; Alayli, Yasser

doi:10.1016/j.optlaseng.2013.01.013

Cited by 14 publications

(5 citation statements)

References 32 publications

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“…To bound the pupil area, a 14 mm diameter diaphragm (D) was placed in front of the LCoS. This diameter was equal to the height of the LCoS rectangular aperture of 2 20…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…In other words, given two SLMs acting as mirrors, each reflecting a portion of a common beam, the superposition of the two wavefronts reflected by the SLMs will be affected by non-synchronous fluctuations in phase resulting in a nullified interference pattern [17,18]. Efforts have been made to reduce these fluctuations with polarized light [19], by cooling the LC molecules [17,20], or by changing the period of the pulsed width modulation (PWM) of the SLMs [21].…”

Section: Introductionmentioning

confidence: 99%

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Super-resolution with a complex-amplitude pupil mask encoded in the first diffraction order of a phase grating

Aguilar

García-Márquez

Landgrave

2020

Optics and Lasers in Engineering

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“…To bound the pupil area, a 14 mm diameter diaphragm (D) was placed in front of the LCoS. This diameter was equal to the height of the LCoS rectangular aperture of 2 20…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Super-resolution with a complex-amplitude pupil mask encoded in the first diffraction order of a phase grating

Aguilar

García-Márquez

Landgrave

2020

Optics and Lasers in Engineering

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“…Boulder Nonlinear Systems incorporates heating in an SLM for the purpose of increased response time, but the parameter is not adjustable by the user 11 . Other works employing temperature control focused only on cooling the SLM to reduce phase flicker, but these works used twisted nematic liquid crystals and digital drive schemes only appropriate for amplitude modulation and on relatively slow time scales 12,13 . It is common for active cooling (usually in the form of a copper block and radiator) to be employed for the purpose of heat dissipation when using high average power lasers.…”

Section: Active Temperature Controlmentioning

confidence: 99%

Performance metrics and active temperature control of spatial light modulators

Wolenski

Linnenberger

2023

Adaptive Optics and Wavefront Control for Biological Systems IX

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Liquid crystal on silicon (LCoS) spatial light modulators (SLMs) are versatile scientific tools relevant to an increasingly wide variety of research and technological applications including digital holography, wavefront correction, optical tweezing, and non-mechanical beam steering to name a few. Since SLMs are used in a multitude of different ways, some aspects of device performance (e.g., response time) are crucial to certain applications while being irrelevant to others. In this work we couple our standard SLMs with a thermo-electric cooler, allowing for tunability of the device operating temperature from 0° -75 °C. We show that there is an inherent tradeoff between the liquid crystal response time and the phase stability of an SLM, and that the operating temperature offers a means of controlling this tradeoff. Furthermore, this paper aims to provide the reader with a brief but thorough explanation of SLM operating principles and device structure, defines the performance metrics of the SLM, and provides a methodology for measuring the specifications. By allowing control over the SLM operating temperature and detailing how temperature affects device functionality, SLM users are afforded greater experimental flexibility and will be better able to tailor the performance of their device for the given project or application at hand.

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“…Under certain conditions -for instance, due to the fluctuating temperature of the SLM elements -it has been observed that pulse length rapidly varies in time 16,18 . In this case, FROG trace becomes a sum of FROG traces with a distribution of spectral chirp ( , Δ ).…”

Section: Chirp Instabilitymentioning

confidence: 99%

Dispersion Scan Frequency Resolved Optical Gating For Evaluation of Pulse Chirp Instability

Guesmi¹,

Veselá²,

Žídek³

2020

Preprint

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The commonly used methods to characterize ultrafast laser pulses, such as frequency-resolved optical gating (FROG) and dispersion scan (d-scan), face problems when they are used on pulses varying within the acquisition time or laser beam. Such chirp variation can be identified by a discrepancy between the measured FROG and d-scan traces and their reconstructed counterparts. Nevertheless, quantification of the instability from the experimental data is a more complex task. In this work, we evaluate the precision of chirp instability quantification based on three different pulse characterization techniques. Two commonly used techniques FROG and d-scan are compared to a new method dispersion scan FROG (D-FROG) that combines the idea of dispersion scanning with the FROG method. We demonstrate the characterization of pulses generated from NOPA together with pulses processed by a 4f-pulse shaper without and with SLM-adjusted phase. In this paper, we validate the performance of the new method to estimate the chirp instability and, therefore, to improve the reconstruction of the measured results. Furthermore, we discuss the instability origin of each measurement case by using fast-scan autocorrelation traces.

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Flicker in a twisted nematic spatial light modulator

Cited by 14 publications

References 32 publications

Super-resolution with a complex-amplitude pupil mask encoded in the first diffraction order of a phase grating

Super-resolution with a complex-amplitude pupil mask encoded in the first diffraction order of a phase grating

Performance metrics and active temperature control of spatial light modulators

Dispersion Scan Frequency Resolved Optical Gating For Evaluation of Pulse Chirp Instability

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