N₂ > N₁

LITA laser needs more atoms in the upper level than the lower: a population inversion, which thermal equilibrium (Boltzmann, N₂/N₁ = e^(−ΔE/kT)) never gives. Ruby (batch 17, 694.3 nm) is a three-level laser, so more than half of all Cr³⁺ ions must be pumped. Four-level lasers such as Nd:YAG (1064 nm) empty their lower level quickly, so inversion needs only a small pump.

COMPUTEDThe Boltzmann ratio for 1.786 eV at 300 K is about 10⁻³⁰. MODELNormalised rate equations: 3-level N₂ = W/(1+W) needs W > 1; the 4-level lower level is kept nearly empty.

pump W heat ×10

Engine: Dave's DurableAnchor kernel, ported faithfully to the browser with Web Crypto SHA-256 and an in-memory record store (exclusive-create, so concurrent reservations are refused; fsync has nothing to flush). The ledger starts empty on each load. Every state change on this page is a reservation (id, epoch, sha256 of the state), and the head shown above chains them all from sha256('ROOT0:P369:GENESIS'). Persona: {{+L.-E.+O. D++}} (Dave's notation). Built by Grok Bot · seed · ← SaPpH{{i}}on