Notch Filters

Description

1.  Features

• High Transmittance: Ensures high light transmission for a broad range of wavelengths, excluding only the specific blocked wavelengths.
• Deep Reflection: Capable of providing strong reflection across specific wavelengths while allowing the rest of the spectrum to pass through.
• Narrow Rejection Bands: Filters out very specific wavelength ranges, ideal for selective wavelength separation.
• Customizable Wavelengths: Available for different custom wavelengths such as 488nm, 532nm, 632.8nm, and 1064nm.
• Versatile Applications: Perfect for Raman spectroscopy, laser-based fluorescence instrumentation, and confocal/multi-photon microscopy.

2. General Description

Notch Filters are optical filters designed to selectively block specific wavelengths, effectively rejecting a narrow portion of the spectrum while allowing the transmission of all other wavelengths. These filters are especially useful in applications where it is necessary to block a specific wavelength, such as in Raman spectroscopy, laser-based fluorescence instruments, or confocal/multi-photon microscopy. Their highly efficient rejection capability ensures that only the desired wavelengths pass through, with a strong reflection in the blocked range. The filters are made from H-K9L material, offering high durability and low optical distortion. SOT’s Notch Filters offer excellent performance across various wavelengths (e.g., 488, 532, 1064nm), delivering precise optical performance for demanding applications in scientific, medical, and industrial instrumentation.

3. Spectrum Transmission Curves

If the standard components are not available, Shape Optics Technologies Pte Ltd (SOT) offers customized notch filters designed specifically for your wavelength requirements. Upon your request, tailored solutions for precise spectrum transmission can be developed according to your needs.

4. Coating Quality

• Adhesion Test: Adheres to MIL-C-675C military standards. A tape (LT-90 specification) is applied to the lens film layer and removed three times without causing blistering or peeling.
• Temperature Test: Test pieces undergo temperatures of -62±1°C and 71±1°C per MIL-C-675C specifications. After two hours at room temperature (16-32°C), no film detachment occurs.
• Abrasion Resistance Test: Conforming 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 for 25 cycles with no damage to the surface.
• Humidity Test: Under MIL-C-675C standards, the film remains intact in controlled temperature and humidity (49±2°C, 95%-100% humidity) for 24 hours with no peeling or defects.
• Solvent and Cleaning Test: After exposure to acetone and alcohol for 10 minutes each, followed by cleaning with a cotton cloth, the film shows no peeling or scratches.
• Salt Spray Test: No damage is observed after 100 hours of exposure to a 5% saltwater solution at 35°C.

5. Standard Specifications

6. General Applications and Examples

• Raman Spectroscopy: Essential for high-precision spectral analysis, especially when isolating specific Raman shifts.
• Laser-based Fluorescence Instruments: Used to selectively block excitation wavelengths while allowing emission wavelengths to pass through for accurate fluorescence measurement.
• Confocal and Multi-Photon Microscopy: Vital for eliminating undesired light sources, enhancing imaging quality in both confocal and multi-photon applications.
• Spectral Analysis: Notch filters are used in various spectrometers to isolate specific wavelength regions, improving measurement accuracy.

7. SOT Strengths and Capabilities

Shape Optics Technologies Pte Ltd (SOT) is committed to providing world-class optical components designed to meet the highest industry standards. SOT’s expertise in developing customized optical filters such as Notch Filters ensures precise optical performance for demanding applications in fields like medical imaging, research, and industrial analysis. The company’s rigorous testing procedures, along with its ability to offer tailored solutions, makes SOT a trusted partner for delivering durable, high-performance optical components. The company’s advanced capabilities and focus on innovation enable it to provide reliable products for a wide range of industries, including biomedical instruments, spectral analysis, and high-precision optical systems.

8. Standard Products