Effect of cooling gas on the thermal lens effect of the focusing lens for a high-power CO2 laser

Daqing Zhu; Duluo Zuo; Xinjun Zhou; Shimin Li; Jiangong Liu

doi:10.1117/12.361175

8 September 1999 Effect of cooling gas on the thermal lens effect of the focusing lens for a high-power CO₂ laser

Daqing Zhu, Duluo Zuo, Xinjun Zhou, Shimin Li, Jiangong Liu

Proceedings Volume 3862, 1999 International Conference on Industrial Lasers; (1999) https://doi.org/10.1117/12.361175
Event: International Symposium on Industrial Lasers, 1999, Wuhan, China

Abstract

This paper studies the influence of the cooling gas on the thermal lens effect (TLE) theoretically. It provides a method to calculate the influence of the cooling gas on the temperature of the focusing lens and presents a parameter called relax time of the temperature change (RTTC) of the focusing lens to characterize the temperature change. It studies the change of the laser power density on the surface of workpiece with the time or the cooling gas rate. Cooling gas can reduce the temperature of the lens and make it stable more rapidly. Increasing the flow rate of cooling gas can reduce the TLE greatly, however, it has a limitation. Beyond this limitation, increasing the rate leads to less reducing of the TLE and the RTTC. Double sides cooling is much more efficient than the single side one. Besides, increase of the diameter of the lens can also reduce the RTTC. It also shows that TLE is caused mainly by the change of refractive index of the lens with temperature.

Citation Download Citation

Daqing Zhu, Duluo Zuo, Xinjun Zhou, Shimin Li, and Jiangong Liu "Effect of cooling gas on the thermal lens effect of the focusing lens for a high-power CO₂ laser", Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); https://doi.org/10.1117/12.361175

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