Ultrasimple alignment-free ultrashort pulse measurement devices

Dongjoo Lee; Pam Bowlan; Aparna P. Shreenath; Pablo Gabolde; Qiang Cao; Selcuk Akturk; Xun Gu; Rick Trebino

doi:10.1117/12.645244

28 February 2006 Ultrasimple alignment-free ultrashort pulse measurement devices

Dongjoo Lee, Pam Bowlan, Aparna P. Shreenath, Pablo Gabolde, Qiang Cao, Selcuk Akturk, Xun Gu, Rick Trebino

Proceedings Volume 6108, Commercial and Biomedical Applications of Ultrafast Lasers VI; 610818 (2006) https://doi.org/10.1117/12.645244
Event: Lasers and Applications in Science and Engineering, 2006, San Jose, California, United States

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.

Citation Download Citation

Dongjoo Lee, Pam Bowlan, Aparna P. Shreenath, Pablo Gabolde, Qiang Cao, Selcuk Akturk, Xun Gu, and Rick Trebino "Ultrasimple alignment-free ultrashort pulse measurement devices", Proc. SPIE 6108, Commercial and Biomedical Applications of Ultrafast Lasers VI, 610818 (28 February 2006); https://doi.org/10.1117/12.645244

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KEYWORDS

Ultrafast phenomena

Measurement devices

Ultraviolet radiation

Spectral resolution

Spectroscopy

Beam splitters

Diffraction gratings

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