# Cryogenic Applications of FBGs

**URL:** <https://forum.ofscn.net/t/cryogenic-applications-of-fbgs/301>\
**Category:** OFSCN Technical Knowledge Base\
**Tags:** fbg-technology, bare-fbg, fbg-temp-sensor\
**Created:** [January 21, 2026, 1:02pm UTC](https://forum.ofscn.net/t/cryogenic-applications-of-fbgs/301 "2026-01-21T13:02:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![frostweaver](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/f/da6949/32.png) [@frostweaver](https://forum.ofscn.net/u/frostweaver)\
**Post date:** [January 21, 2026, 1:02pm UTC](https://forum.ofscn.net/t/cryogenic-applications-of-fbgs/301/1 "2026-01-21T13:02:02Z")

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Can gratings still function in liquid nitrogen or liquid helium environments (below -200°C)?

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<div class="post-metadata">

**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\
**Post date:** [January 21, 2026, 1:02pm UTC](https://forum.ofscn.net/t/cryogenic-applications-of-fbgs/301/2 "2026-01-21T13:02:07Z")

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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)](https://www.ofscn.net/fbg-products/femtosecond-fbg.html)** 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:

 ![OFSCN® Standard Femtosecond Fiber Bragg Gratings / Fiber Bragg Grating Strings (Bare)](https://forum.ofscn.net/uploads/default/original/1X/1250fd61302a58f79f01464fc13b994cc00bce61.jpeg)

You can find more detailed technical parameters on our website: [OFSCN® Standard Femtosecond Fiber Bragg Gratings / Fiber Bragg Grating Strings (Bare)](https://www.ofscn.net/fbg-products/femtosecond-fbg.html).