Low modulus coatings from MY Polymers lower hot-spot temperature
LM Low Modulus coatings are used in high-power cascaded cladding light strippers, and are designed to reduce stress in thermal cycling. The cascaded design includes few elements, with refractive indices of 1.47, 1.48, and 1.49. The structures enable gradual dissipation of cladding power, lowering the temperature of hot spots.
MY Polymers
Ness Ziona, Israel
![Refractive index vs. temperature was measured for the various amorphous polyimides; for example, the BTDT polyimide (a) and linear least-squares lines fit to the data. The volume coefficient of thermal expansion (VCTE) vs. 1/m* (where m* is the molecular weight) was calculated from the data for the various polyimides (b) and the results (colored dots) compared to data (open black dots) from a 2017 study of on crystalline polyimides done by Ishige et al [2]. The VCTE for the amorphous polyimides is significantly lower than those for the crystalline polyimides.](https://img.laserfocusworld.com/files/base/ebm/lfw/image/2018/09/content_dam_lfw_print_articles_2018_09_1809lfw_wn_f2.png?auto=format,compress&fit=crop&q=45&h=139&height=139&w=250&width=250)
