Silicon (Si) Mirrors for CO2 Lasers

Silicon mirrors offer excellent durability, ensuring prolonged performance within laser processing optical path systems.
Withstand varying thermal conditions without compromising reflective integrity, maintaining consistent performance during laser operations.
Serve as total reflectors, rear reflectors, fold mirrors, and beam benders, providing flexibility in various laser processing setups.
Optimized for CO2 laser systems, featuring a protective gold coating, ensuring reflectivity above 99% for unpolarized radiation, and a laser damage threshold of 4 kW for Ø 10 mm, catering to specific laser requirements.

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Specifications:

Materials	Silicon (Si)	Density	2.33 g/cm³
Surface Quality	40/20 S/D (MIL-PRF-13830B)	Clear Aperture	>80% of full dimension
Dimensional Tolerance	+0.0 -0.2 mm	Thickness Tolerance	±0.25 mm
Surface Flatness	λ/4 @ 633nm	Operation Wavelength	10.6 µm
Coating	protected gold	Reflectivity for Unpolarized Radiation	>99%
Laser Damage Threshold	4 kW for Ø 10 mm

Modules or Types:

Following modules and types of Silicon mirrors are available in stock:

Diameter (mm)	Thickness(mm)	Substrate Materials	Reflections at 10.6μm
12	3	Monocrystalline Silicon	R≥99% at λ=10.6μm
18	3	Monocrystalline Silicon	R≥99% at λ=10.6μm
19	3	Monocrystalline Silicon	R≥99% at λ=10.6μm
20	3	Monocrystalline Silicon	R≥99% at λ=10.6μm
25	3	Monocrystalline Silicon	R≥99% at λ=10.6μm
25.4	3	Monocrystalline Silicon	R≥99% at λ=10.6μm
30	3	Monocrystalline Silicon	R≥99% at λ=10.6μm
38.1	5	Monocrystalline Silicon	R≥99% at λ=10.6μm
50.8	7	Monocrystalline Silicon	R≥99% at λ=10.6μm
200	15	Monocrystalline Silicon	R≥99% at λ=10.6μm

Silicon (Si) Mirror is an important component in laser processing optical path systems, which reflect light according to the predetermined route and direction. Si mirror is one of the most prevalent reflective mirrors for lasers. The inherent transmission range 1 - 25 µm spectral range, low cost, decent thermal endurance, and durability render silicon mirrors an excellent option for CO2 lasers. A silicon mirror consists of a silicon substrate and a reflective gold coating, which introduce a vulnerableness to the silicon mirror, therefore Si mirrors are recommended for lower power CO2 lasers as flat fold mirrors, and in clean conditions where back spatter and dust will not cause catastrophic damage of the mirrors. These reflective Silicon mirrors or total reflectors can be used as rear reflectors and fold mirrors and as beam benders, which save space, help reduce light loss, and reserve laser power. It is a great optical accessory for laser equipment such as laser cutting machines, laser engraving machines, and laser marking machines.

Shalom EO offers Standard and Custom Silicon Mirrors. Regarding the standard silicon mirrors, various dimensions with diameters from 12mm to 200mm and thicknesses from 3mm to 15mm are available. Advanced polishing and coating techniques are utilized to ensure reflectance above 99% for unpolarized radiation, and a laser damage threshold of 4 kW for Ø 10 mm, minimizing scattering and wavefront distortion and optimizing mirror performance over prolonged use in harsh laser environments. Silicon mirrors with custom dimensions and specific precision requirements are also available.