Offer the following technical specifications:

● Substrate Material: Metal (oxygen-free copper, stainless steel) and non-metal (silicon, glass, micro-crystal ceramic) optical raw materials.

● Surface Quality: λ/20-λ (λ = 632.8 nm), or as per customer request.

● Beam Parallelism Error: 3-30 arc seconds, or as per customer request.

● Coating Options: Aluminum, copper, silver, gold, hydrophobic.