Using Protected Gold Mirror for 3D Scanning & Structured Light: What to Know

Optical designers sometimes treat mirrors as simple parts, yet in 3D Scanning & Structured Light the mirror decides beam direction, loss budget and even image contrast.…

Optical designers sometimes treat mirrors as simple parts, yet in 3D Scanning & Structured Light the mirror decides beam direction, loss budget and even image contrast. The Protected Gold Mirror is a quietly critical component whose details repay careful attention.

A Protected Gold Mirror is an optical component built so that reflection happens at the coated front face rather than through a substrate. With a protected gold on a silicon, copper or glass base, the part delivers 98%+ in the IR reflectivity across 700 nm to 10.6 µm while keeping the useful aperture clean and ghost-free.

The working principle is the law of reflection applied to a coated plane. Mount the Protected Gold Mirror at 45° and a beam turns 90°; stack several and you fold a long path into a short box. That simplicity is why mirrors remain the fastest way to route light in 3D Scanning & Structured Light.

The protected gold is where performance is won or lost. Deposited by vacuum processes, it is tuned so the reflected wave adds constructively across 700 nm to 10.6 µm, reaching 98%+ in the IR. Getting the layer thickness right is a precision task: a few nanometers off and the reflectivity curve shifts.

A Protected Gold Mirror starts as a silicon, copper or glass blank. We hold it to λ/4 flatness and 40-20 surface quality, then apply the protected gold. The substrate never sees the beam directly, but its figure sets the limit on how straight the reflected wavefront stays.

A practical Protected Gold Mirror datasheet reads: silicon, copper or glass substrate, λ/4 flatness, 40-20 quality, 0.5–6 mm thick, 98%+ in the IR over 700 nm to 10.6 µm. Those five lines settle most design reviews for 3D Scanning & Structured Light. See the standard size list for what we stock and what we cut to order.

Most 3D Scanning & Structured Light engineers reach for a Protected Gold Mirror when they need projecting and capturing patterned light accurately. The component's job is unglamorous but essential — keep the light on course and the loss low.

In 3D Scanning & Structured Light, the Protected Gold Mirror usually appears wherever projecting and capturing patterned light accurately. Designers value it because it keeps the beam path predictable and the loss budget small, which translates directly into a more stable instrument. The applications overview maps where each industry places it.

Selecting a Protected Gold Mirror for 3D Scanning & Structured Light starts with the wavelength and angle of incidence, then the acceptable loss. Match the protected gold to 700 nm to 10.6 µm, confirm 98%+ in the IR, and make sure the silicon, copper or glass and 0.5–6 mm fit the mount you already have. The spec and size tables make that comparison quick.

Mirrors reward careful handling. Hold a Protected Gold Mirror by the edges, keep the coated face away from fingers and aerosols, and clean only with approved optics tissue and solvent when truly needed. Store it in its packaging, coated face protected, and it will hold 98%+ in the IR for years.

Our production of a Protected Gold Mirror follows a simple, repeatable route: laser-cut the silicon, copper or glass to ±0.01 mm, smooth the edges, deposit the protected gold, and inspect to λ/4 / 40-20. Thickness options span 0.5–6 mm, and the same Hangzhou line that builds first-surface mirrors also runs windows, substrates and custom coatings.

The working principle is the law of reflection applied to a coated plane. Mount the Protected Gold Mirror at 45° and a beam turns 90°; stack several and you fold a long path into a short box. That simplicity is why mirrors remain the fastest way to route light in 3D Scanning & Structured Light.

Durability is part of the spec, not an afterthought. For 3D Scanning & Structured Light the Protected Gold Mirror should survive shipping, installation and the occasional wipe. The protective overcoat on the protected gold is what lets it do that without losing 98%+ in the IR over time.

When you specify a Protected Gold Mirror, the numbers that matter are flatness λ/4, finish 40-20, and the reflectance 98%+ in the IR across 700 nm to 10.6 µm. Thickness 0.5–6 mm is mostly about handling and mount compatibility, but it still belongs on the print. The specification table covers the common configurations.

Coating a Protected Gold Mirror means laying down a protected gold whose optical thickness is controlled to a fraction of a wavelength. Done well, the part holds 98%+ in the IR over 700 nm to 10.6 µm; done carelessly, it drifts and the system loses light it cannot afford to lose.

The working principle is the law of reflection applied to a coated plane. Mount the Protected Gold Mirror at 45° and a beam turns 90°; stack several and you fold a long path into a short box. That simplicity is why mirrors remain the fastest way to route light in 3D Scanning & Structured Light.

Mounting notes

A Protected Gold Mirror is only as good as its mount. Use edge contact rather than clamping the face, avoid over-tightening that bends the silicon, copper or glass and degrades λ/4, and keep the coated side clear of adhesive. In 3D Scanning & Structured Light a kinematically supported mirror stays aligned through thermal cycles and shipping.

A Protected Gold Mirror starts as a silicon, copper or glass blank. We hold it to λ/4 flatness and 40-20 surface quality, then apply the protected gold. The substrate never sees the beam directly, but its figure sets the limit on how straight the reflected wavefront stays.

A Protected Gold Mirror starts as a silicon, copper or glass blank. We hold it to λ/4 flatness and 40-20 surface quality, then apply the protected gold. The substrate never sees the beam directly, but its figure sets the limit on how straight the reflected wavefront stays.

Mirrors reward careful handling. Hold a Protected Gold Mirror by the edges, keep the coated face away from fingers and aerosols, and clean only with approved optics tissue and solvent when truly needed. Store it in its packaging, coated face protected, and it will hold 98%+ in the IR for years.

Wrapping up

A Protected Gold Mirror is a small part with an outsized effect on 3D Scanning & Structured Light. Get the protected gold, silicon, copper or glass and flatness right and the rest of the system behaves. If your drawing calls for something specific, the team at JYOPTO can cut and coat it to match — start from the specifications and standard sizes, then tell us the wavelength and angle.