ENHANCED-BANDWIDTH MSFVW-OPTICAL INTERACTION EMPLOYING AN INHOMOGENEOUS BIAS FIELD.

A significant improvement is reported in the bandwidth for Bragg interaction between magnetostatic forward volume waves (MSFVWs) and laser light propagating transverse to each other in a YIG film. This bandwidth enhancement is achieved through MSFVW-optical Bragg interaction using bias field inhomogeneity as a means of extending the bandwidth of a nondispersive delay line. The experimental work used specially machined pole pieces yielding a linear variation of the bias field with distance along an in-plane direction that is normal to the MSFVW propagation direction. The observed improvement in bandwidth for MSFVW-optical Bragg interaction is almost twelvefold; the bandwidth is about 350 MHz with the inhomogeneous bias field, compared to a maximum observed bandwidth of about 30 MHz obtained with a homogeneous bias field.