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Esta frase, que solíamos escuchar en la llamada caja tonta, era emitida por uno de los gigantes de la televisión chilena algunas décadas atrás, cada vez que un programa se interrumpía para dar paso a la siempre provocadora, incitadora y por qué no decirlo, en ocasiones también poco empática tanda comercial. Así que, llegado el momento de hacer una pausa, nuestros oídos recibían el mensaje con el que titulé esta columna.
1. Introduction Semiconductor lasers and laser diodes are widely used in different areas, such as systems of cutting, welding, and joining of materials [1]; fiber optic or free space communications, including space communications [2,3]; or in scientific fields in instruments, inertial confinement to nuclear fusion [1], atomic clocks [4,5], and space micro propulsion systems [1,6,7].
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