Design Blueprint: A Treacy Grating-Pair Compressor for a 100 J Beam Sized by Dispersion, Separation and Grating Aperture

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24155363): This paper presents a computed design for a four-grating Treacy compressor recompressing a 100 J, nanosecond-stretched pulse at 800 nm to the femtosecond range. The sizing follows from applying the relevant intensity, thermal, nonlinear and geometric bounds at a single stated operating point, with every number produced by a deposited computation. The headline result is a Littrow angle of 36.3 degrees, a dispersion of 7.59e+06 fs2 per metre of pair separation, a required separation of 1.05 m to cancel the stated stretcher chirp, gratings 0.34 m long for the 20 cm beam, and a four-grating throug Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.