Conventional lens-based image relays introduce radial group delay that significantly reduces focal-spot intensity of ultra-broadband short pulses. A direct compensation scheme that can be used with conventional singlet image relays is proposed. The compensation scheme is based on using two negative lenses embedded within an Offner imaging system. The setup allows a single-pass configuration and eliminates the need for polarization switching optics. The performance of this setup is calculated using ray tracing. The compensation improves the spatiotemporal Strehl ratio from 0.02 to 0.97.
© 2014 Optical Society of America
Original Manuscript: December 12, 2013
Manuscript Accepted: January 3, 2014
Published: February 14, 2014
Seung-Whan Bahk, Jake Bromage, and Jonathan D. Zuegel, "Offner radial group delay compensator for ultra-broadband laser beam transport," Opt. Lett. 39, 1081-1084 (2014)