Enhancement proposals

A solprop Enhancement Proposal (SEP) is the design document for one major change — a new model, route or numerical scheme, a changed default or convention, a redesigned interface. It sets out the motivation, the theory with its references, the implementation options and how the result will be verified; once accepted it is implemented in phases, numpy_ref first, then numba_cpu and the Kokkos backend, and each phase appends its report to the SEP. Finished SEPs are archived and linked from the manual pages they produced. SEP 0 describes the process and says when a SEP is needed; new SEPs start from the template. The roadmap lists accepted and in-progress SEPs first, then drafts under discussion, followed by informal work not fully covered by a proposal.

Commit hashes recorded before solprop’s first public release (in proposals, reports and benchmark entries) refer to the unpublished development history; the public history starts at that release. Likewise, the campaign harnesses and data they cite under benchmarks/ (other than the standard suite’s own modules) are kept with the project’s development records, not in this repository.

Open

Proposals that are active, in draft, accepted, in progress or deferred.

SEP	Title	Status	Type
0	Purpose and process	Active	Process
1	Efficient causal Raman evaluation	Draft	Feature
2	Two-photon absorption	Draft	Feature
4	Bounded execution autotuning	Draft	Feature
5	Solid ionisation and bulk filamentation	Draft	Feature
7	Laser gain dynamics in solid-core fibres	Draft	Feature
8	Second-order nonlinearity and birefringent crystal optics	Draft	Feature
9	Broadband beam measurements and propagation statistics	Draft	Feature
10	Low-rank Raman kernels along density paths	Draft	Feature
11	Finite-density gas index and mixture optics	Draft	Change
17	Broadband two-photon continuum response beside strong-field ionisation	Accepted	Feature
21	Temporal boundaries: wider windows, absorption and the escaped field	Draft	Change
32	Raman Maxwell–Bloch dynamics	Draft	Feature

SEP 13, the standalone numerical prerequisite for SEP 12, SEP 14, which carried it to the compiled backends, and SEP 16, which unified the multistep family and made it the default, are final and archived; numbering records creation order, not implementation order.

Archived

Proposals that are final, rejected, withdrawn or superseded; the archive lists them.

SEP	Title	Status	Type
3	Materials, Raman responses and ionisation rates from optmat	Final	Change
6	Frequency-dependent electronic third-order response	Final	Feature
12	TDSE-driven nonlinear response for gas-filled capillaries	Final	Feature
13	Low-call integration for expensive nonlinear responses	Final	Feature
14	Step efficiency across routes: limits, collars, tables and dense output	Final	Change
15	Exponential Adams stepping for dispersive, broadband problems	Superseded	Feature
16	Unified multistep integration and work–precision qualification	Final	Feature
18	Band-exact running integrals for the field-grid plasma	Final	Change
19	Field-scale radial quadrature for single-mode capillaries	Final	Feature
20	haCC helium TDSE target	Final	Feature
22	Memory-lean spatial execution: statistics-only planes, construct-once runs and operator settings	Final	Change
23	Far-field aperture and angular-region spectra for free-space runs	Final	Feature
24	A low-storage interaction-picture Runge–Kutta march for memory-bound fixed-step runs	Final	Feature
25	Rounding-level reproducibility and the performance it frees	Final	Change
26	An edge-free gated TDSE source: hold the current instead of switching it off	Final	Change
27	An edge-free field-grid plasma source: hold the current at the temporal collar	Final	Change
28	Free-space evaluation at the memory bound	Final	Change
29	The native backend in solprop, distributed as binaries	Final	Change
30	Standard benchmark suite	Final	Process
31	Coupling simulations and transporting ultrafast fields	Final	Feature
33	Single-precision propagation, and an MLX backend for Apple GPUs	Final	Feature
34	Medium flux for free-space propagation	Final	Change