Long Wave Pass Filter

Long pass filter Description

1.  Features

• High Transmission: Ensures maximum light throughput with superior optical performance.
• Superior Damage Threshold: Designed for high-energy applications, these filters can withstand intense conditions.
• Excellent Thermal Stability: Reliable performance even under varying temperature conditions.
• Low Wavefront Distortion: Contributes to high-quality images and precise measurements.
• Customization Options: Filters can be tailored to specific wavelength needs and sizes for diverse applications.

2. General Description

Long wave pass filters, also known as long-pass filters, are optical components designed to pass light at wavelengths greater than a specified cutoff wavelength while blocking shorter wavelengths. These filters are vital in applications where selective transmission is required, such as in fluorescence instrumentation, heat rejection, and color filtering. At Shape Optics Technologies Pte Ltd (SOT), our long wave pass filters feature high transmission rates, excellent damage resistance, and outstanding thermal stability, ensuring optimal performance across diverse environments. SOT’s long-pass filters are crafted from superior materials like BK7 and ZnSe, with custom designs available based on specific requirements, including size, coating, and performance specifications. Whether you are working in scientific research, medical applications, or industrial settings, these filters provide the clarity and precision needed.

3. Spectrum Transmission Curves

• If standard components are unavailable, SOT can provide customized services tailored to your specific needs, ensuring you get the best performance for your application.

4. Coating Quality

• Adhesion Test: Compliant with MIL-C-675C military standards, our filters undergo an adhesion test that involves applying a tape meeting LT-90 specifications to the lens film layer. The procedure is performed three times, ensuring no blistering or peeling of the coating.
• Temperature Test: In line with MIL-C-675C specifications, test pieces are subjected to temperatures ranging from -62°C to 71°C, and after room temperature stabilization, the adhesion test is repeated to confirm no film detachment.
• Abrasion Resistance Test: Adhering to MIL-C-675C and CCC-C-440 standards, a gauze tester applies a minimum force of 1.0 lbs (0.45 kg) to the film, repeated 25 times to ensure no surface damage.
• Humidity Test: Test pieces are subjected to a controlled temperature and humidity chamber for 24 hours under 49±2°C and 95-100% humidity, with no peeling or other defects observed.
• Solvent and Cleaning Test: Following MIL-C-675C guidelines, test pieces are exposed to acetone and alcohol for at least 10 minutes each. After drying, the film surface shows no damage.
• Salt Spray Test: After 100 hours in a 35°C environment with a 5% saltwater concentration, the film shows no degradation.

5. Standard Specifications

6. General Applications and Examples

Long wave pass filters are essential in a wide range of applications, such as:

• Fluorescence Instrumentation: These filters help in isolating specific wavelengths for detecting fluorescence signals, ensuring clear and accurate results.
• Heat Rejection Applications: Used in situations where blocking specific wavelengths of heat-producing radiation is critical, such as in thermal cameras or heat-sensitive equipment.
• Color Filters: In color imaging systems, long wave pass filters allow the passage of desired wavelengths, enhancing image clarity and ensuring proper color representation.
• Optical Instruments: Widely used in optical instruments for their ability to selectively pass light while blocking other undesired wavelengths.
• Multi-band Detection Systems: Used in advanced detection systems requiring precise control of wavelength ranges for detecting multiple target signals.

7. SOT Strengths and Capabilities

Shape Optics Technologies Pte Ltd (SOT) prides itself on delivering high-quality optical components designed to meet the most demanding industrial, scientific, and medical applications. With years of expertise in the field, SOT offers custom-tailored solutions, ensuring optimal optical performance. Our advanced manufacturing capabilities, combined with strict adherence to quality control standards, allow us to meet the unique requirements of each customer. We specialize in providing filters, lenses, windows, and coatings with the highest precision, durability, and reliability. Whether it’s a standard product or a highly customized solution, SOT guarantees exceptional performance and service.

8. Standard Products

Custom options are available on request, including different coatings, sizes, and other specifications tailored to the needs of your specific application.