Can gratings still function in liquid nitrogen or liquid helium environments (below -200°C)?
Yes, Fiber Bragg Gratings can function in liquid nitrogen or liquid helium environments.
Specifically, OFSCN® Standard Femtosecond Fiber Bragg Gratings / Fiber Bragg Grating Strings (Bare) can operate in temperatures as low as -270°C, making them suitable for cryogenic applications. This requires special processing by Beijing Dacheng Yongsheng Technology Co., Ltd.
Here is an image of a bare FBG:
You can find more detailed technical parameters on our website: OFSCN® Standard Femtosecond Fiber Bragg Gratings / Fiber Bragg Grating Strings (Bare).