{"artifact_id":"L1-021","layer":"L1","title":"Second Harmonic Generation (SHG) Microscopy","domain":"Microscopy","sub_domain":"Chi-2 non-centrosymmetric NLO imaging","physics_fingerprint":{"L_DAG":3.5,"title":"Second Harmonic Generation (SHG) Microscopy","domain":"Microscopy","carrier":"photon","primitives":["L.excitation.nonlinear_chi2","S.scan.raster","int.temporal"],"sub_domain":"Chi-2 non-centrosymmetric NLO imaging","noise_model":"shot_poisson","problem_class":"nonlinear_inverse","solution_space":"2D_intensity","difficulty_delta":5,"integration_axis":"temporal","sensing_mechanism":"second_harmonic_nlo"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D intensity is guaranteed within the declared Omega bounds. Uniqueness is local rather than global (non-convex landscape); convergence depends on initialisation and priors. Stability is moderately conditioned (kappa_eff ~= 15); pulse_compression_drift dominates the stability cliff; sample_scattering and the remaining mismatch parameters contribute higher-order bias terms. Photon-shot-noise-limited (poisson counting) sets the irreducible data-fidelity floor, while mild Tikhonov or analytic inversion is sufficient at the nominal Omega point.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"H":512,"W":512,"NA":1.0,"pixel_nm":500,"lambda_ex_nm":920,"peak_photons":100,"pulse_width_fs":100,"sample_scattering":0.0,"quasi_phase_mismatch":0.0},"input_format":"measurement_only","problem_class":"shg","forward_operator":"shg_forward","epsilon_fn_center":"24.0"},"omega_bounds":{"H":[128,2048],"W":[128,2048],"NA":[0.6,1.1],"pixel_nm":[200,1000],"lambda_ex_nm":[800,1100],"peak_photons":[10,2000],"pulse_width_fs":[50,500],"sample_scattering":[0.0,0.5],"quasi_phase_mismatch":[0.0,0.3]},"epsilon_bounds":{"psnr_db":[12.0,42.0]},"allowed_problem_classes":["shg"],"allowed_omega_dimensions":["H","W","pixel_nm","NA","lambda_ex_nm","peak_photons","pulse_width_fs","sample_scattering","quasi_phase_mismatch","pulse_compression_drift","sample_scattering","quasi_phase_mismatch"],"allowed_forward_operators":["shg_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":300,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x27555a14a99c9b9b5d4eeadcf0a413c93b7e0ff95a6de4e24740c491919146aa","chain_tx_hash":"0x835cc7a436d59b7909b3aed2559bed9119295e641e2885093301ba1efddbcd0f","chain_block":41554168}