Share Email Print
cover

Proceedings Paper

Ultrasimple alignment-free ultrashort pulse measurement devices
Author(s): Dongjoo Lee; Pam Bowlan; Aparna P. Shreenath; Pablo Gabolde; Qiang Cao; Selcuk Akturk; Xun Gu; Rick Trebino
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

We describe two novel, practical ultrashort laser pulse measurement devices, which are also experimentally very simple. The first one is an "ultra-broadband" pulse characterization device that is based on FROG, but uses transient grating (TG) process. TG FROG involves forming an induced grating in a piece of glass by crossing two pulses in space and time and then diffracting a third pulse off it to create a fourth diffracted pulse. The TG process is inherently very broadband and automatically phasematched. We have implemented an ultrasimple TG FROG device, which can also operate single-shot. First, three beams are created using a simple mask. Then, a cylindrical beams line-focuses the beams horizontally, where the induced grating is generated. The variation of the relative delay is achieved by crossing the two grating-creation beams at an angle using a Fresnel biprism. Then, by detecting the diffracted pulse with spatial resolution, the TG FROG trace is captured. The second device that we present aims to measure ultrashort pulses with complex spectral and temporal structure. Spectral interferometry (SI) works perfectly for this purpose. SI simply involves measuring the spectrum of the sum of the unknown (shaped) and known (reference) light waves. Unfortunately, SI is very difficult to align and maintain aligned, as it requires that the two beams be nearly perfectly collinear. We solved this problem by utilizing optical fibers. Spectral resolution is also significantly improved by using spatial fringes, avoiding time-domain filtering.

Paper Details

Date Published: 28 February 2006
PDF: 7 pages
Proc. SPIE 6108, Commercial and Biomedical Applications of Ultrafast Lasers VI, 610818 (28 February 2006); doi: 10.1117/12.645244
Show Author Affiliations
Dongjoo Lee, Georgia Institute of Technology (United States)
Pam Bowlan, Georgia Institute of Technology (United States)
Aparna P. Shreenath, Georgia Institute of Technology (United States)
Pablo Gabolde, Georgia Institute of Technology (United States)
Qiang Cao, Georgia Institute of Technology (United States)
Selcuk Akturk, Georgia Institute of Technology (United States)
Xun Gu, Georgia Institute of Technology (United States)
Rick Trebino, Georgia Institute of Technology (United States)


Published in SPIE Proceedings Vol. 6108:
Commercial and Biomedical Applications of Ultrafast Lasers VI
Joseph Neev; Stefan Nolte; Alexander Heisterkamp; Christopher B. Schaffer, Editor(s)

© SPIE. Terms of Use
Back to Top