Compact self-illuminated image upconversion system based on intracavity second-harmonic generation

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Title: Compact self-illuminated image upconversion system based on intracavity second-harmonic generation
Authors: Torregrosa, Adrián José | Maestre, Haroldo | Rico Soliveres, María Luisa | Capmany, Juan
Research Group/s: Tecnología Informática Avanzada - Seguridad Legal
Center, Department or Service: Universidad de Alicante. Departamento de Tecnología Informática y Computación
Keywords: Nonlinear wave mixing | Infrared imaging | Lasers, upconversion | Lasers, solid-state
Knowledge Area: Arquitectura y Tecnología de Computadores
Issue Date: 10-Oct-2018
Publisher: Optical Society of America
Citation: Optics Letters. 2018, 43(20): 5050-5053. doi:10.1364/OL.43.005050
Abstract: We present an image upconversion system based on intracavity Type II second-harmonic generation to create an image in the visible spectrum of a target illuminated by an infrared laser. The system has the novelty of being self-illuminated. It uses some fractional leaking power of the infrared laser to illuminate a target located in the object focal plane of the system, and to couple back a created infrared target image to an intracavity nonlinear crystal, where it mixes with the cavity laser beam to obtain a second-harmonic image, visible with a silicon CCD camera. For a proof of concept, we have built a system based on a diode-pumped Nd3+:YVO4 continuous-wave (cw) laser and an intracavity KTP crystal to upconvert 1342 nm target images to 671 nm. The upconverted cw power allowed us to capture real-time video in a standard nonintensified CCD camera, with 2.5 W of a diode pump.
Sponsor: Gobierno de España, Ministerio de Economía y Competitividad (MINECO) (TEC2014-60084-R, TEC2017-88899-C2-1-R); European Regional Development Fund (ERDF).
ISSN: 0146-9592 (Print) | 1539-4794 (Online)
DOI: 10.1364/OL.43.005050
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Optical Society of America
Peer Review: si
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