Broadband Dielectric High Reflective Mirror
High-performance Broadband Dielectric Mirror uses multi-layer dielectric films to form a highly reflective surface on an optical substrate, which can achieve nearly 100% reflectivity in specified wavelength bands. Compared with the traditional metal film mirror, it has low absorption, strong thermal stability, and precise phase control, making it ideal for laser cavities, scientific research experiments, precision imaging, and optical communication systems. Whether it is a narrow-linewidth laser or a high-power pulsed laser, the Broadband Dielectric Mirror can work stably, reduce optical loss, and improve system efficiency.
Features
- The reflectivity inside the design band can be as high as 99.5%, reducing the loss of light energy.
- Low Absorption & High Power Resistance: Designed for high repetition of laser pulses or high-power continuous beams to avoid thermal damage.
- Precise Phase Control: Ensuring the stability of the optical path of the interferometer, laser cavity, and imaging system.
- Flexible Band Customization: Able to cover UV, visible, and NIR bands for different applications.
- Long-term Reliability: The film layer and substrate are strictly treated for long-term use in laboratories and industries.
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Customization Capabilities
- Size and Form: Round, square, oval, or special shapes could be customised according to the requirements of the optical system.
- Layer Design: The thickness and the number of layers in multi-layer media film are designed based on the customer’s wavelength and angle of incidence for high reflection or broadband reflection.
- Angle of Incidence Optimization: Ensuring high reflection performance at different angles and improvement in optical path utilization.
- Interface Customization: The Broadband Dielectric Mirror can be directly matched with fiber optics, collimators, laser cavities, or optical platforms for easy integration.
Usage Scenarios
- Laser Cavity and Beam Control: High reflectors are applied for laser cavity end-face reflection, beam shaping, and output control.
- Scientific Research Experiments: Interferometers, spectrometers, and nonlinear optical experiments require high phase stability scenarios.
- Precision Imaging: Includes microscopes, astronomical telescopes, and optical projection systems.
- Optical Communication Systems: Optical fiber communication, optical path regulation, and beam splitting applications.
- Industrial Laser Processing: Pulsed laser marking, micromachining, and material surface treatment.
Frequently Asked Questions (FAQs)
Q1: For what wavelengths are Broadband Dielectric Mirrors suitable?
A: They can achieve arbitrary wavelength reflection according to the film layer design from UV to NIR.
Q2: How high-power laser can it withstand?
A: The high-power densities it can generally withstand are ≤20 W/cm². An application-based selection of film layer and substrate is required.
Q3: How do I clean the mirror surface?
A: Use optical paper or a special optical cloth to gently wipe; avoid using acid and alkali cleaning agents, and keep the Broadband Dielectric Mirror clean.
Use and Maintenance
- Regularly clean the dust, particles, or oil from the mirror surface to avoid affecting reflective properties.
- First, use air blowing or low-pressure nitrogen to remove floating dust during cleaning, and then gently wipe withan optical cloth.
- To avoid overheating of the mirror surface when operating with high-power lasers, a cooling device or system should be used.
- Long-term preservation: Put it in a protective box to keep it dry, light-proof, and dustproof, and avoid accidental collision.
Notes
- During installation, ensure the Broadband Dielectric Mirror surface is stable and avoid vibration or offset affecting the optical path.
- Verify that the optical power and wavelength match the layer design to prevent overloading of the film layer.
- Avoid long periods of use in high humidity, high dust, or corrosive environments.
- Wear gloves during handling or maintenance to reduce sebum contact with the membrane surface.
- If it is scratched, peeled, or reflective decreases, stop using it immediately and contact the supplier for maintenance or replacement.
Optical Mirror Specifications
| Parameter | Specification |
|---|---|
| Substrate Material | BK7, Fused Silica, materials from DUV to IR, or custom materials |
| Dimensions | 0.5 mm – 500 mm (custom shapes and sizes available) |
| Dimension Tolerance | +0.0 / -0.2 mm |
| Thickness Tolerance | ±0.2 mm |
| Clear Aperture | Central 90% of diameter (> 90%) |
| Surface Flatness | λ/10 @ 632.8 nm (per 25 mm, before coating) |
| Surface Quality | 10-5 S/D (High Precision) |
| Parallelism | < 3 arcmin |
| Surface Roughness | < 100 Å (typical) |
| Bevel | Protective bevel < 0.5 mm × 45° |
| Wavelength Options | 266 nm, 355 nm, 532 nm, 780 nm, 915 nm, 976 nm, 1064 nm, 1550 nm, etc. |
| Operating Temperature | -40°C to 80°C |
| Coating | Dielectric high-reflection coating (single side), Ravg > 99.5%; backside fine ground or polished |
| Reflectivity (Optional) | R > 99.9% @ specific wavelength (AOI = 0° or 45°); R > 97% @ UV |
| Laser Damage Threshold | > 5 J/cm², 20 ns, 20 Hz @ 1064 nm |
