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Draw a neat hand-drawn ink schematic of a benchtop laser-optics experiment on warm cream notebook paper, laid out as a single top-down optical-table diagram reading left to right with a beam path tracing through the components. Start with a labelled "HeNe Laser, 633 nm, 5 mW" box on the left, its beam striking a 45-degree "Mirror M1" that folds the path, then passing through a "Beam Splitter (50:50)" sending a reference arm to a second "Mirror M2" and the main arm through a "Convex Lens, f = 100 mm" into a "Sample Chamber" drawn as a small cuvette. After the sample the beam reaches a "Photodetector" wired to a "Readout / Lock-in Amplifier" with a tiny signal-trace inset. Add handwritten-style annotations, arrowheads marking beam direction, dimension callouts like "d = 40 mm" and "120 mm", a small north arrow and a "scale: 1 cm" bar. Keep it tidy and publication-clean with legible cursive labels, faint blue ruled grid lines and a subtle margin.
