6C005 Category 6C

“Laser” materials as follows (see List of Items Controlled).

Category 6: Sensors and Lasers

Reasons for control

• NS: National security
• AT: Anti-terrorism

Country chart

List-based license exceptions

Items

1. a. Synthetic crystalline “laser” host material in unfinished form as follows:
2. a.1. Titanium doped sapphire;
3. a.2. [Reserved]
4. b. Rare-earth-metal doped double-clad fibers having any of the following:
5. b.1. Nominal “laser” wavelength of 975 nm to 1,150 nm and having all of the following:
6. b.1.a. Average core diameter equal to or greater than 25 µm; and
7. b.1.b. Core 'Numerical Aperture' ('NA') less than 0.065; or
8. b.2. Nominal “laser” wavelength exceeding 1,530 nm and having all of the following:
9. b.2.a. Average core diameter equal to or greater than 20 µm; and
10. b.2.b. Core 'NA' less than 0.1.

Related controls

N/A

Notes

Note to 6C005.b.1: 6C005.b.1 does not apply to double-clad fibers having an inner glass cladding diameter exceeding 150 µm and not exceeding 300 µm.

Technical Notes: 1. For the purposes of 6C005.b.1.b, the core 'Numerical Aperture' ('NA') is measured at the emission wavelengths of the fiber. 2. 6C005.b includes fibers assembled with end caps.

Source: eCFR, version 2026-08-01, retrieved 2026-08-20T04:04:59+00:00.