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HR (High-Reflectivity) Broadband Mirrors feature multi-layer dielectric or metallic coatings optimized for ≥98% reflectivity across extended wavelength bands. The flat substrate (fused silica, silicon, or germanium) ensures minimal beam distortion during reflection.
Substrates:
Fused Silica: UV-Vis transparency (200–2000 nm), low thermal expansion (CTE: 0.55 ppm/°C).
Silicon: Mid-IR transparency (1–8 μm), high thermal conductivity (149 W/m·K) for high-power applications.
Germanium: Long-wave IR (8–14 μm), ideal for thermal imaging and CO₂ laser systems.
Coatings:
Dielectric (Multi-Layer): Alternating TiO₂/SiO₂ layers for >99% reflectivity in 400–1100 nm (visible-near IR).
Metallic: Protected silver (450–20,000 nm, ≥97%) or gold (2–20 μm, ≥98%) for broadband IR performance.
Dielectric coatings cover 400–1100 nm (e.g., 488–694 nm for argon/krypton lasers).
Metallic coatings offer flat reflectivity curves: silver (450–12,000 nm), gold (2–20 μm, dip <98% only below 3 μm).
Dielectric: 1 J/cm² (10 ns, 1064 nm), suitable for pulsed Nd:YAG lasers.
Gold: 750 W/cm² (CW, 10.6 μm), ideal for continuous-wave CO₂ laser beam steering.
Tailor coatings for specific sub-bands (e.g., 650–850 nm for VCSEL arrays) with ±5 nm tolerance on peak reflectivity wavelength.
Surface roughness <5 nm RMS (atomic force microscopy tested) minimizes stray light in sensitive spectroscopy applications.
Beam Delivery Systems: Redirect 1064 nm fiber laser beams in CNC cutting machines, maintaining >98% reflectivity over 1000–1100 nm.
Optical Isolation: Separate pump (980 nm) and signal (1550 nm) beams in erbium-doped fiber amplifiers.
Raman Spectroscopy: Reflect 785 nm excitation light while transmitting Raman-shifted signals (790–1800 nm).
Fluorescence Microscopy: Efficiently reflect excitation wavelengths (e.g., 488 nm, 561 nm) in confocal setups.
Infrared Cameras: Gold-coated germanium mirrors reflect 8–14 μm radiation in military-grade thermal vision systems.
Pyrometers: Direct mid-IR (3–5 μm) emissions from high-temperature targets (1000–2000°C) to detectors.
Wide-Field Imagers: Capture broad spectral ranges (350–1100 nm) in ground-based telescopes, minimizing chromatic aberration.
CubeSat Optics: Lightweight fused silica substrates (≤50 g for 50 mm diameter) with radiation-resistant coatings for space missions.
How do dielectric vs. metallic coatings differ in performance?
Dielectric coatings offer higher reflectivity (≥99%) in narrow bands with low absorption, while metallic coatings provide broadband coverage (≥97%) with slightly higher thermal absorption.
Can these HR Broadband Mirrors be used in vacuum environments?
Yes, all coatings are outgassing-tested (ASTM E595) for vacuum compatibility (10⁻⁶ Torr), suitable for electron microscopy and space applications.
What cleaning methods are recommended?
Use lint-free wipes with isopropyl alcohol (≥99%) for routine cleaning. For stubborn residues, apply a soft brush (10–20 mm bristle length) with deionized water.
Do you offer anti-reflective coatings on substrate back surfaces?
Yes, optional AR coatings (≤0.5% reflectance per surface) are available for UV, Vis, or IR to eliminate ghost reflections in multi-element systems.
Spectral Expertise
Our coating engineers use optical modeling software (e.g., ThinFilm Design) to optimize layer stacks for ±0.5% reflectivity tolerance across target bands.
Rigorous Testing
Every HR Broadband Mirrors undergoes:
Reflectance sweep (200–25,000 nm) using a Cary 7000 spectrometer.
Thermal cycling (-40°C to +85°C, 10 cycles) to ensure coating adhesion.
Industry-Leading Lead Times
Stock sizes (12.7–50.8 mm) ship within 24 hours; custom coatings/sizes ready in 3–4 weeks.
Application-Specific Solutions
Collaborate with our team to design HR Broadband Mirrors for challenging environments, such as high-vibration (10–2000 Hz, 2 g) or high-humidity (95% RH) conditions.
