Splitting femtosecond laser pulses by using a Dammann grating

Guowei Li; Changhe Zhou; Enwen Dai

doi:10.1117/12.576169

11 January 2005 Splitting femtosecond laser pulses by using a Dammann grating

Guowei Li, Changhe Zhou, Enwen Dai

Proceedings Volume 5642, Information Optics and Photonics Technology; (2005) https://doi.org/10.1117/12.576169
Event: Photonics Asia, 2004, Beijing, China

Abstract

A Dammann grating can generate an array of uniform intensity and equally spaced spots for an incoming monochromatic light beam. But chromatic dispersion will occur when a beam of femtosecond laser pulse, which contains a broad spectral bandwidth, is split by a Dammann grating. Furthermore, the quantity of chromatic dispersion is different in each diffraction order. As a result, diffraction spots of splitting beams are becoming more elliptical as the diffraction order increases. In this paper, we propose a method of using an m time density’s grating to collimate the mth order beam that is split by a Dammann grating. In this way, an array of femtosecond laser beams that are eliminated lateral chromatic dispersion can be obtained by using a Dammann grating and a group of compensation gratings. At the same time, the increased width of the compensated output pulse is briefly discussed with Kirchhoff-Fresnel integral, and in the case of the pulse duration of 100fs, the increased amount of the pulse width at the different diffraction orders and the shape variation of the output diffraction spots are not serious. As a new kind of beam splitter, this splitting and compensation system is high efficiency and material dispersion is avoided if reflection gratings are employed. It should be highly interesting in practical applications of splitting femtosecond laser pulses for pulse-width measurement, pump-probe measurement, and micromachining at multiple points.

Citation Download Citation

Guowei Li, Changhe Zhou, and Enwen Dai "Splitting femtosecond laser pulses by using a Dammann grating", Proc. SPIE 5642, Information Optics and Photonics Technology, (11 January 2005); https://doi.org/10.1117/12.576169

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available