Abstract

This paper presents a study on the quality of interference fringes formed from a pulsed UV ($255\text{\hspace{0.17em} nm}$, $5.6\text{\hspace{0.17em} kHz}$, and $40\text{\hspace{0.17em} ns}$) source for an application in writing fiber Bragg gratings (FBGs). The interference fringes of separation of about $8\mu \text{m}$, 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 $5\text{\hspace{0.17em} min}$ (over ${10}^6$ pulses). Second harmonic UV $\left(255\text{\hspace{0.17em} nm}\right)$ 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 $\left(510\text{\hspace{0.17em} nm}\right)$ 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

Analysis on the saturation of refractive index modulation in fiber Bragg gratings (FBGs) written by partially coherent UV beams

Ramakanta Mahakud, Om Prakash, Shankar V. Nakhe, and Sudhir Kumar Dixit
Appl. Opt. 51(12) 1828-1835 (2012)

Spatial coherence of the generalized diffraction-filtered resonator copper vapor laser

Om Prakash, Paritosh K. Shukla, Sudhir K. Dixit, Sanjeeb Chatterjee, Harilal S. Vora, and Rajiva Bhatnagar
Appl. Opt. 37(33) 7752-7757 (1998)

Analysis of tuning of Bragg wavelength of photowritten fiber Bragg gratings during the inscription process using a biprism

Srikanth Gurram and Ashish Kumar Nath
Appl. Opt. 46(12) 2197-2204 (2007)

Single-pulse time-resolved comparative study on the performance of a master-oscillator, power-amplifier copper-vapor-laser system with generalized diffraction-filtered and unstable resonators as master oscillators

Om Prakash, Gorakh N. Tiwari, Sudhir K. Dixit, and Rajiva Bhatnagar
Appl. Opt. 42(18) 3538-3545 (2003)

4.7-W, 255-nm source based on second-harmonic generation of a copper-vapor laser in cesium lithium borate

Rodney I. Trickett, Michael J. Withford, and Daniel J. W. Brown
Opt. Lett. 23(3) 189-191 (1998)