The 2022 Shift in Automotive LiDAR: Where the Concave Mirror Fits

Every Automotive LiDAR system eventually meets the same question: where does the light go, and how much of it survives the turn? A well-specified Concave Mirror answers…

Every Automotive LiDAR system eventually meets the same question: where does the light go, and how much of it survives the turn? A well-specified Concave Mirror answers both, which is why it earns a place on the bill of materials long before the enclosure is drawn.

A Concave Mirror is an optical component built so that reflection happens at the coated front face rather than through a substrate. With a dielectric or metallic on a BK7 or fused silica base, the part delivers > 99% reflectivity across laser line or visible while keeping the useful aperture clean and ghost-free.

Reflection on a first surface is straightforward physics: photons strike the coated face and are returned according to the law of reflection, angle in equals angle out. Because the coating sits on top, there is no second surface behind it to create a faint ghost image, which matters whenever contrast or measurement accuracy is at stake.

Coating a Concave Mirror means laying down a dielectric or metallic whose optical thickness is controlled to a fraction of a wavelength. Done well, the part holds > 99% over laser line or visible; done carelessly, it drifts and the system loses light it cannot afford to lose.

A Concave Mirror starts as a BK7 or fused silica blank. We hold it to λ/10 flatness and 20-10 surface quality, then apply the dielectric or metallic. The substrate never sees the beam directly, but its figure sets the limit on how straight the reflected wavefront stays.

When you specify a Concave Mirror, the numbers that matter are flatness λ/10, finish 20-10, and the reflectance > 99% across laser line or visible. Thickness 1–10 mm is mostly about handling and mount compatibility, but it still belongs on the print. The specification table covers the common configurations.

Where measuring distance by timing reflected light pulses, a Concave Mirror earns its place by doing one job reliably: turning the beam without adding noise. In Automotive LiDAR that reliability is the difference between a prototype and a shippable product. More application examples are worth a look if the use case is close to yours.

2022 in context

During 2022, rapid investment in AR/VR and automotive sensing expanded demand for compact, high-yield mirror optics. For Automotive LiDAR that meant renewed attention to parts like the Concave Mirror, where measuring distance by timing reflected light pulses. Engineers who locked in a reliable dielectric or metallic on BK7 or fused silica early found it easier to scale when demand rose.

For Automotive LiDAR, do not over-specify. Choose the dielectric or metallic that covers laser line or visible at the angle you use, keep flatness at λ/10 unless the wavefront demands more, and you will have a Concave Mirror that is both capable and economical.

Mirrors reward careful handling. Hold a Concave 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 > 99% for years.

Our production of a Concave Mirror follows a simple, repeatable route: laser-cut the BK7 or fused silica to ±0.01 mm, smooth the edges, deposit the dielectric or metallic, and inspect to λ/10 / 20-10. Thickness options span 1–10 mm, and the same Hangzhou line that builds first-surface mirrors also runs windows, substrates and custom coatings.

A Concave Mirror is tougher than it looks but softer than you think. Fingerprints on the dielectric or metallic are the usual cause of field failures, so edge-handling and capped storage pay off. A little discipline keeps > 99% where it belongs.

Coating a Concave Mirror means laying down a dielectric or metallic whose optical thickness is controlled to a fraction of a wavelength. Done well, the part holds > 99% over laser line or visible; done carelessly, it drifts and the system loses light it cannot afford to lose.

Reflection on a first surface is straightforward physics: photons strike the coated face and are returned according to the law of reflection, angle in equals angle out. Because the coating sits on top, there is no second surface behind it to create a faint ghost image, which matters whenever contrast or measurement accuracy is at stake.

Where measuring distance by timing reflected light pulses, a Concave Mirror earns its place by doing one job reliably: turning the beam without adding noise. In Automotive LiDAR that reliability is the difference between a prototype and a shippable product. More application examples are worth a look if the use case is close to yours.

How the part is checked

Before a Concave Mirror leaves the line it is inspected for flatness (λ/10), finish (20-10) and reflectance (> 99% over laser line or visible). A simple 45° visual check reveals coating defects, and a flatness test confirms the wavefront stays within tolerance — the same discipline JYOPTO applies across its optical glass, vacuum-coating and precision cold-processing since 2020.

Selecting a Concave Mirror for Automotive LiDAR starts with the wavelength and angle of incidence, then the acceptable loss. Match the dielectric or metallic to laser line or visible, confirm > 99%, and make sure the BK7 or fused silica and 1–10 mm fit the mount you already have. The spec and size tables make that comparison quick.

Think of the Concave Mirror as a precisely made BK7 or fused silica plate whose working surface is a dielectric or metallic. The result is > 99% reflection across laser line or visible, which is exactly what most Automotive LiDAR builders are looking for.

Quality control

Every Concave Mirror is measured, not just sampled. Flatness against a reference, scratch-dig against 20-10, and a reflectance spot-check at laser line or visible confirm the dielectric or metallic performed as designed. Documented results matter most for Automotive LiDAR, where one bad part can stall a whole instrument.

In real service a Concave Mirror meets more than the optical table. Humidity, temperature swings and routine cleaning all test the dielectric or metallic. A good protective layer keeps the metal from oxidizing, so the part holds > 99% across laser line or visible for years rather than months — exactly what Automotive LiDAR equipment that ships to varied climates needs.

Mounting notes

A Concave Mirror is only as good as its mount. Use edge contact rather than clamping the face, avoid over-tightening that bends the BK7 or fused silica and degrades λ/10, and keep the coated side clear of adhesive. In Automotive LiDAR a kinematically supported mirror stays aligned through thermal cycles and shipping.

Quick terminology

"Flatness λ/10" describes how close the surface is to a perfect plane, in fractions of a wavelength. Tighter flatness costs more but protects wavefront quality, which is why Automotive LiDAR systems specify it explicitly rather than leaving it to chance.

In real service a Concave Mirror meets more than the optical table. Humidity, temperature swings and routine cleaning all test the dielectric or metallic. A good protective layer keeps the metal from oxidizing, so the part holds > 99% across laser line or visible for years rather than months — exactly what Automotive LiDAR equipment that ships to varied climates needs.

In short

For Automotive LiDAR, the Concave Mirror is less a commodity than a tuned component. Specify the band (laser line or visible), the reflectivity (> 99%) and the figure (λ/10), and you will spend less time debugging light you cannot see. That is the whole game. Where your application sits among the sectors we serve changes the details, not the method.