Active modulation of laser coded systems using near infrared video projection system based on digital micromirror device (DMD)

Aly A. Khalifa; Hussein A. Aly; Ashraf F. El-Sherif

doi:10.1117/12.2214300

15 March 2016 Active modulation of laser coded systems using near infrared video projection system based on digital micromirror device (DMD)

Aly A. Khalifa, Hussein A. Aly, Ashraf F. El-Sherif

Author Affiliations +

Proceedings Volume 9761, Emerging Digital Micromirror Device Based Systems and Applications VIII; 97610A (2016) https://doi.org/10.1117/12.2214300
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Near infrared (NIR) dynamic scene projection systems are used to perform hardware in-the-loop (HWIL) testing of a unit under test operating in the NIR band. The common and complex requirement of a class of these units is a dynamic scene that is spatio-temporal variant. In this paper we apply and investigate active external modulation of NIR laser in different ranges of temporal frequencies. We use digital micromirror devices (DMDs) integrated as the core of a NIR projection system to generate these dynamic scenes. We deploy the spatial pattern to the DMD controller to simultaneously yield the required amplitude by pulse width modulation (PWM) of the mirror elements as well as the spatio-temporal pattern. Desired modulation and coding of high stable, high power visible (Red laser at 640 nm) and NIR (Diode laser at 976 nm) using the combination of different optical masks based on DMD were achieved. These spatial versatile active coding strategies for both low and high frequencies in the range of kHz for irradiance of different targets were generated by our system and recorded using VIS-NIR fast cameras. The temporally-modulated laser pulse traces were measured using array of fast response photodetectors. Finally using a high resolution spectrometer, we evaluated the NIR dynamic scene projection system response in terms of preserving the wavelength and band spread of the NIR source after projection.

Citation Download Citation

Aly A. Khalifa, Hussein A. Aly, and Ashraf F. El-Sherif "Active modulation of laser coded systems using near infrared video projection system based on digital micromirror device (DMD)", Proc. SPIE 9761, Emerging Digital Micromirror Device Based Systems and Applications VIII, 97610A (15 March 2016); https://doi.org/10.1117/12.2214300

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KEYWORDS

Digital micromirror devices

Near infrared

Mirrors

Modulation

Semiconductor lasers

Video

Projection systems

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