Illustrative · unadmitted · revision 1

Femtosecond-written volumetric optical computing volume

This is a proposed definition for criticism. It is not an experiment run, result, evidence claim, canonical admission, inventory record, or procurement request.

Stable identifier: fs-written-volumetric-computing
Kind: hybrid
Intent: falsification

Exact target

external-reference · illustrative-volumetric-recurrent-calculation-origin — conjectural volumetric recurrent calculation origin story

Minimal decisive protocol

Volume-addressed state and operator test

Address separated written paths across a finite 3-D volume, apply a declared optical operator, and test whether state readout remains separable and repeatable across depth and recurrence passes.

Write a finite 3-D address grid.
Calibrate depth-dependent coupling and readout.
Run one pass and repeated feedback passes on basis states.
Compare address cross-talk and operator output with a volumetric simulation.

Decision rule: Volumetric recurrence survives only if address separation, operator agreement, and pass-to-pass stability meet all predeclared bounds.

Controls

matched: Use a planar subset with identical readout. (depth; Depth-specific claim must exceed planar baseline.)
ablated: Break the recurrent feedback path. (feedback; Recurrence-specific signature should disappear.)

Observables and units

Observables
Observable	Units	Measurement	Uncertainty reporting
address crosstalk	fraction	decoded energy outside addressed voxel	report depth calibration
pass-to-pass state stability	dimensionless	complex state overlap	include drift and detector uncertainty

Calibration and repetitions

3-D write/read address: fiducial volumetric grid — depth error below address pitch fraction (µm)

Replicate unit: independent written address volume; minimum 12, independent 4.

Randomization: address and depth order randomized

Stopping rule: complete finite grid unless write safety stop

Uncertainty: write placement, depth aberration, feedback loss, thermal drift; depth-stratified covariance and repeatability intervals; release address maps, raw stacks, and simulation input

Success and falsifiers

Success

Repeated passes preserve separable addressed states and match the declared finite operator. (state overlap and crosstalk >= predeclared bounds dimensionless)

Falsifiers

Feedback-off or planar controls reproduce the proposed volumetric recurrence signature. (control-normalized stability <= predeclared discriminating margin dimensionless)

Required capability groups

writer · required, any-one, quantity 1: 3-D femtosecond writing and depth metrology (system) — address pitch and depth calibration documented
readout · alternative, any-one, quantity 1: depth-resolved complex optical readout (system) — raw depth-resolved stacks and calibration retention
readout · alternative, any-one, quantity 1: phase-resolved modal volume readout (system) — declared modal basis and depth cross-talk matrix

Confounds and raw artifacts

depth aberration creates apparent volume dependence: depth-resolved calibration and planar control; mitigation: correct or bound optical aberration

3-D-complex-state-stack · HDF5 · retain raw passes and write/read calibration

Nonclaims

This is the prominent conjectural origin story's test, not confirmation of it.
It does not claim scalable volumetric memory, recurrent computing, or a useful device.

Provenance boundary

The citation supplies direct-writing context only; it does not support the conjectural volumetric recurrence claim.

Direct laser writing photonics context direct-laser-writing-context

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