Telescopic zoom system for electron acceleration with lasers: general design and tests

B. Le Garrec

doi:10.1117/12.2668426

9 June 2023 Telescopic zoom system for electron acceleration with lasers: general design and tests

B. Le Garrec

Proceedings Volume 12577, High-power, High-energy Lasers and Ultrafast Optical Technologies; 1257709 (2023) https://doi.org/10.1117/12.2668426
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

Both the size of the focal spot and the Rayleigh range of laser beams are increasing with the focal length of a focusing system. When preparing experiments for accelerating electron with lasers, people are considering focal lengths that can range from a few meters up to tens of meters. Telescopic zoom systems made of three spherical mirrors can be designed for such purpose. After a first attempt to design such system based on simple “a priori” parameters, a general algebraic theory has been investigated and shows that there are always solutions with no spherical aberration. When all mirrors are placed off-axis to avoid obscuration of the beam, it is possible to show that there are still solutions that minimize aberrations. When changing the distance between the mirrors, we can obtain a focal excursion of the system while the final focal spot is fixed. Of course, the goal of the study is to find what are the solutions that minimize aberrations for a given numerical aperture over a given zoom range. I have built and tested three zoom systems based on different solutions and I have been able to show that there are simple alignment procedures for generating a fixed focal spot over the zoom range. In this paper, a step-by-step analysis including damage fluence considerations for designing the 3-mirror zoom system will be detailed.

Conference Presentation

Citation Download Citation

B. Le Garrec "Telescopic zoom system for electron acceleration with lasers: general design and tests", Proc. SPIE 12577, High-power, High-energy Lasers and Ultrafast Optical Technologies, 1257709 (9 June 2023); https://doi.org/10.1117/12.2668426

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