Output Coupler Mirror

Product Specifications

Technical details and manufacturing context for Output Coupler Mirror

Definition

In an optical resonator, the output coupler mirror is a critical component that serves as one of the end mirrors. Unlike a high-reflectivity mirror, it has a specific, designed reflectivity (e.g., 95%, 99%) that allows a precise percentage of the circulating laser light to be transmitted out of the cavity as the usable output beam. Its primary role is to balance the need for sufficient feedback within the resonator to sustain lasing action against the requirement to extract useful optical power. The mirror is typically made from materials such as fused silica, Zerodur, or BK7 glass, chosen for their thermal and mechanical properties. Standard diameters range from 12.7 to 50.8 mm, with thicknesses from 3 to 10 mm. Surface flatness is specified at λ/10 at 633 nm, and surface quality is 10-5 scratch-dig, both per ISO 10110. Reflectivity can range from 10% to 90%, depending on the laser gain and desired output coupling. Damage threshold is 10–100 J/cm² at 1064 nm, 10 ns pulse, per ISO 11254. Transmitted wavefront error is λ/4 at 633 nm, and parallelism is ≤1 arcmin. Clear aperture is ≥85% of diameter, with chamfer of 0.1–0.5 mm × 45°. Operating temperature is -40 to 85 °C, and coating adhesion is at least 5 MPa per ISO 9211-4. Weight ranges from 10 to 100 g depending on size and material. These parameters are reference ranges; actual values must be confirmed for the specific model and application. The output coupler is essential for optimizing output power, beam quality, and laser efficiency. It is used in various laser systems, including solid-state, gas, and fiber lasers. Proper selection requires considering the gain medium, resonator design, and desired output characteristics. Verification of specifications should be done with the legal manufacturer or supplier.

Working Principle

The mirror is placed at one end of the optical resonator. Light within the cavity reflects between this mirror and a fully reflective end mirror. On each pass, a controlled percentage of the light's intensity is transmitted through the output coupler's partially reflective coating, forming the output laser beam. The reflectivity (R) and transmittance (T) of the coating are precisely engineered to optimize output power, beam quality, and laser efficiency for a given gain medium and resonator design.

Common Materials

Fused Silica, Zerodur, BK7 Glass

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	12.7–50.8 mm	Standard sizes for laser cavities
Thickness	3–10 mm	Affects thermal lensing and mechanical stability
Surface Flatness	λ/10	At 633 nm; critical for wavefront distortionISO 10110
Surface Quality	10-5 scratch-dig	MIL-PRF-13830B equivalentISO 10110
Reflectivity	10–90 %	Depends on laser gain and output coupling
Damage Threshold	10–100 J/cm²	At 1064 nm, 10 ns pulseISO 11254
Transmitted Wavefront Error	λ/4	At 633 nm; affects beam qualityISO 10110
Parallelism	≤1 arcmin	For beam alignmentISO 10110
Clear Aperture	≥85 %	Of diameter; edge exclusion
Chamfer	0.1–0.5 mm × 45°	Prevents edge chipping
Operating Temperature	-40–85 °C	Coating stability
Coating Adhesion	5 MPa	Minimum pull-off strengthISO 9211-4
Weight	10–100 g	Depends on size and material

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Optical Substrate Part
Provides the mechanical base and optical surface. Made from low-thermal-expansion, high-homogeneity material to minimize wavefront distortion.

Material: Fused Silica, Zerodur, or specialty glass
Dielectric Coating Part
A multi-layer thin-film coating deposited on the substrate. Precisely engineered to achieve the target reflectivity/transmittance at the design wavelength and angle of incidence.

Material: Alternating layers of materials like TiO2, SiO2, Ta2O5, HfO2
Mounting Interface Part
Mechanical features (e.g., edge, holes, bezel) for securing the mirror in a kinematic or rigid mount within the resonator assembly.

Material: Often integral to the substrate or a bonded metal ring

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Optical Resonator

View system integration details

Manufacturers of Output Coupler Mirror

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Frequently Asked Questions

What is the function of an output coupler mirror?

It allows a controlled fraction of laser light to exit the resonator while maintaining sufficient feedback for lasing.

What materials are commonly used?

Fused silica, Zerodur, and BK7 glass are typical substrate materials.

How is reflectivity specified?

Reflectivity is given as a percentage, typically ranging from 10% to 90%, depending on the laser design.

What standards apply?

Surface quality and flatness per ISO 10110, damage threshold per ISO 11254, and coating adhesion per ISO 9211-4. Always verify with the manufacturer.

Data Basis

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pressure:	Atmospheric to 10^-6 Torr (vacuum compatible)
other spec:	Wavelength range: 200-2000 nm, Damage threshold: >5 J/cm² (pulsed), >10 kW/cm² (CW)
temperature:	-50°C to 150°C

Product Specifications

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