Abstract

This paper presents a study on the quality of interference fringes formed from a pulsed UV (255  nm, 5.6  kHz, and 40  ns) source for an application in writing fiber Bragg gratings (FBGs). The interference fringes of separation of about 8μm, formed by a biprism of apex angle 2°, were studied for their contrast, evolution of contrast, and positional and intensity stability over a period of 5  min (over 106 pulses). Second harmonic UV (255  nm) sources of different spatial coherence and pointing stability characteristics were employed as the inputs. It is established that the UV fringes contrast and interference pattern stability with time is largely controlled by the optical resonator geometry of the fundamental wavelength (510  nm) copper vapor laser (CVL) oscillator. In particular, the generalized diffraction filtered resonator (GDFR) CVL produced the highest quality second harmonic beam with the highest fringes contrast and stability. The implications of these results were studied by employing these UV sources for the fabrication of the C-band FBGs by a 24° apex angle biprism.

© 2007 Optical Society of America

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