Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p206
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 592056–595106

glass "lasers" having any of the following:
                  a. "Pulse duration" not exceeding 1 s and output energy exceeding 50 J per pulse; or
                  b. "Pulse duration" exceeding 1 s and output energy exceeding 100 J per pulse;
6. A. 005. e. Components as follows:
              1. Mirrors cooled either by 'active cooling' or by heat pipe cooling;

              Technical Note:
              For the purposes of 6A005.e.1., 'active cooling' is a cooling technique for optical components using flowing fluids within the subsurface (nominally less than 1 mm below the optical surface) of the optical component to remove heat from the optic.
6. A. 005. e. 2. Optical mirrors or transmissive or partially transmissive optical or electro‑optical components, other than fused tapered fibre combiners and Multi‑Layer Dielectric gratings (MLDs), specially designed for use with specified "lasers";

              Note: Fibre combiners and MLDs are specified by 6A005.e.3.
6. A. 005. e. 3. Fibre "laser" components as follows:
                  a. Multimode to multimode fused tapered fibre combiners  having all of the following:
                     1. An insertion loss better (less) than or equal to 0.3 dB maintained at a rated total average or CW output power (excluding output power transmitted through the single mode core if present) exceeding 1,000 W; and
                     2. Number of input fibres equal to or greater than 3;
                  b. Single mode to multimode fused tapered fibre combiners having all of the following:
                     1. An insertion loss better (less) than 0.5 dB maintained at a rated total average or CW output power exceeding 4.6 kW;
                     2. Number of input fibres equal to or greater than 3; and
                     3. Having any of the following:
                         a. A Beam Parameter Product (BPP) measured at the output not exceeding 1.5 mm mrad for a number of input fibres less than or equal to 5; or
                         b. A BPP measured at the output not exceeding 2.5 mm mrad for a number of input fibres greater than 5;
                  c. MLDs having all of the following:
                     1. Designed for spectral or coherent beam combination of 5 or more fibre "lasers"; and
                     2. CW "Laser" Induced Damage Threshold (LIDT) greater than or equal to 10 kW/cm2.
6. A. 005. f. Optical equipment as follows:
N.B.: For shared aperture optical elements, capable of operating in "Super‑High Power Laser" ("SHPL") applications, see the Munitions List.
1. Not used since 2017;
N.B.: For items previously specified by 6A005.f.1., see 6A004.f.

6. A. 005. f. 2. "Laser" diagnostic equipment specially designed for dynamic measurement of "SHPL" system angular beam steering errors and having an angular "accuracy" of 10 µrad (microradians) or less (better);
3. Optical equipment and components, specially designed for coherent beam combination in a phased‑array "SHPL" system and having any of the following:
a.  An "accuracy" of 0.1