Programmable color tuning of a multiline laser by means of a twisted nematic liquid crystal display

José Luis Martínez, María Del Mar Sánchez-López, Pascuala García-Martínez, Ignacio Moreno, Juan Campos

Research output: Contribution to journalArticleResearchpeer-review

Abstract

An optical system useful to tune in a controlled way the color of a triline argon krypton (Ar-Kr) laser by means of a twisted nematic liquid crystal display (TNLCD) is presented. The optical setup employs a 4f system and two blazed gratings to first separate and then recombine the spectrum of the light beam. The TNLCD is included in the intermediate focal plane operating in the amplitude modulation mode to control the relative transmission of each spectral line. The resulting color is accurately predicted by using a previously developed physical model of the spectral and voltage dependence of the TNLCD birefringence. By simply changing the gray level image addressed to the display, the Ar-Kr laser is color modulated at a video rate, thus becoming an interesting, reconfigurable, coherent light source for applications such as multicolor holography or color inspection. © 2012 Optical Society of America.
Original languageEnglish
Pages (from-to)6368-6375
JournalApplied Optics
Volume51
Issue number26
DOIs
Publication statusPublished - 10 Sep 2012

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