# Femtosecond Laser Inscription Technology for FBGs

**URL:** <https://forum.ofscn.net/t/femtosecond-laser-inscription-technology-for-fbgs/229>\
**Category:** OFSCN Technical Knowledge Base\
**Tags:** fbg-technology, bare-fbg, fbg-temp-sensor, high-temp-cable\
**Created:** [January 18, 2026, 2:24pm UTC](https://forum.ofscn.net/t/femtosecond-laser-inscription-technology-for-fbgs/229 "2026-01-18T14:24:12Z")\
**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 18, 2026, 2:24pm UTC](https://forum.ofscn.net/t/femtosecond-laser-inscription-technology-for-fbgs/229/1 "2026-01-18T14:24:13Z")

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Are gratings inscribed by femtosecond lasers more resistant to high temperatures than traditional UV-inscribed ones?

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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 18, 2026, 2:24pm UTC](https://forum.ofscn.net/t/femtosecond-laser-inscription-technology-for-fbgs/229/2 "2026-01-18T14:24:20Z")

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Yes, gratings inscribed by femtosecond lasers, such as the [OFSCN® Standard Femtosecond Fiber Bragg Gratings / Fiber Bragg Grating Strings (Bare)](https://www.ofscn.net/fbg-products/femtosecond-fbg.html), generally exhibit significantly higher temperature resistance compared to traditional UV-inscribed FBGs.

**Technical Explanation:**

Femtosecond laser inscription is a point-by-point writing process that does not damage the fiber’s coating. When inscribed on standard OFSCN® SM Polyimide Optical Fiber, these gratings can achieve a maximum operating temperature range of **-270℃ to 800℃** (with special processing).

In contrast, traditional UV-inscribed FBGs typically have lower temperature limits:

- **OFSCN® Polyacrylate Fiber Bragg Gratings / Fiber Bragg Grating Strings (bare)** (UV-inscribed) have an available temperature range of **-40℃ to 100℃**.
- **OFSCN® Polyimide Fiber Bragg Gratings / Fiber Bragg Grating Strings (bare)** (UV-inscribed) have an available temperature range of **-200℃ to 300℃**.

This enhanced temperature resistance of femtosecond FBGs is crucial for applications in extreme high-temperature environments.

Here is an image of a bare FBG:  
  
[https://www.ofscn.net/images/53/190719-768/250-FBG.jpg](https://www.ofscn.net/images/53/190719-768/250-FBG.jpg)

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