Notch Filters

At G&H, we don’t just manufacture notch filters; we advance them using a digitized rugate technique. This innovative approach allows us to adjust the width and depth of the notch at any wavelength, all while maintaining a high level of light transmission. The result is a filter tailored to specific needs, providing optimal protection without compromising visibility.

One significant advantage of our notch filters is our ability to 'color correct' the filter, making it as neutral as possible to the human eye. This means that while the filters block harmful wavelengths, they allow the rest of the visible spectrum to pass through unaffected, minimizing color distortion.

G&H's notch filters represent a fusion of science, innovation, and safety. They stand as proof of our commitment to protecting sight, whether in the surgical theater or on the battlefield, ensuring clarity isn't compromised when it matters the most.

Applications

• Eye protection in ophthalmic surgeries
• Shielding military personnel and vehicles on the battlefield
• Electro-Optical Protection Measures (EOPM) on military vehicles

In a world where precision is critical to safety, G&H notch filters are making strides in both medical and military applications. Utilizing a digitized rugate technique, our filters are transforming eye protection in ophthalmic surgeries and shielding military personnel and vehicles on the battlefield.

Laser eye surgery has revolutionized the field of ophthalmology, but with such powerful technology comes the need for equally powerful protection. This is where G&H’s notch filters play a crucial role. Used during ophthalmic laser eye surgery, our filters shield surgeons' eyes from harmful laser light, enabling them to perform delicate procedures safely and accurately. This form of protection is paramount to maintaining the eye health of those who work tirelessly to improve the sight of others.

But the application of our notch filters extends beyond the operating room. On the battlefield, vision and safety go hand in hand. Our notch filters are incorporated into periscopes and other optical systems used by military personnel, acting as a crucial line of defense against potentially harmful light sources. Whether in combat or reconnaissance, these filters ensure that our servicemen and servicewomen can perform their duties safely, protecting their sight while they protect our security.

Moreover, G&H's notch filters form an essential part of Electro-Optical Protection Measures (EOPM) on military vehicles. These filters safeguard the electro-optical sensors from harmful radiation or laser attacks, ensuring their operability is not compromised and thus maintaining the vehicles' protective capabilities in high-risk situations.

Key Metrology

• UV, VIS, and IR spectrometers
• 4 point conductivity probe
• MIL standard temperature and humidity chambers

Key Equipment & Processes

• Thin-film design including bespoke HUD design software
• PVD, CVD, and IBS coating platforms
• Laser test to MILT-DTL-62422
• TS1888 DLC test bench

Specifications

• Transmission (IVPT Ill E) > 70%
• OD > 4.5 @ 532nm AOI 0°-10°
• Rejection bandwidth < 25nm as taken from the 10% transmission points
• Excitation Purity < 20%
• Colour Corrected
• Transmission (IVPT Ill E) > 50%
• Excitation Purity < 10%

Conformance

• Adhesion: ISO 9211-4-01-03 (severe)
• Abrasion: ISO 9211-4-02-02
• Humidity: ISO 9022-16-05-01
• Contamination: ISO 9022-12 Severity 1 Evaluation as per criteria 0