Design of laser collimating and focusing system under small working distance

Weijing Zhou; Hao Chang; Jifei Ye

doi:10.1117/12.2524435

29 March 2019 Design of laser collimating and focusing system under small working distance

Weijing Zhou, Hao Chang, Jifei Ye

Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 110462M (2019) https://doi.org/10.1117/12.2524435
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China

Abstract

Laser micro thruster based on semiconductor laser has great advantages in volume. However, the design of optical collimating and focusing system is very challenging under highly integrated conditions. The operating distance from the laser exit to the working ablation target needs to be tens of millimeters. Based on the ray tracing method, a convenient and fast design method of the optical collimating and focusing system is proposed under the small working distance. The method is verified by an example. The design conditions are as follows: laser wavelength is 940 nm, fiber core diameter is 105 microns, and the numerical aperture is 0.22; focusing spot diameter is 50 microns; fiber head and ablation surface distance is not more than 20 mm; only one lens is used. Using the method proposed in this paper, the final design results are as follows: doubly convex lens R₁ = 5mm, R₂ = 25mm~30mm, lens aperture D = 6mm, central thickness T_C = 2mm. According to the energy simulation results, the method proposed in this paper is effective.

Citation Download Citation

Weijing Zhou, Hao Chang, and Jifei Ye "Design of laser collimating and focusing system under small working distance", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110462M (29 March 2019); https://doi.org/10.1117/12.2524435

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