GLS640N Visible Light Absorbing Dye – 640nm Peak for Red Laser Blocking and Optical Notch Filters
GLS640N is a high-performance visible light absorbing dye with peak absorption at 640nm. It is specifically formulated for blocking red light sources, including He-Ne lasers (632.8nm), red diode lasers (635–650nm), and other red-emitting devices. This dye offers excellent thermal stability and solubility, making it ideal for laser protection filters, optical notch filters, and anti-counterfeiting coatings.
Peak absorption wavelength: 640nm ± 2nm – covers 630–650nm range
High optical density in red region, minimal absorption in blue-green
Excellent solubility in ketones, esters, and aromatic solvents
Good heat stability up to 200°C for short periods
Low fluorescence – suitable for high-contrast optical applications
Compatible with PMMA, PC, PS, and epoxy resins
GLS640N Typical Specifications
- Absorption Peak: 640±2nm (in MC)
- Appearance: Dark purple crystalline powder
- Solubility: Soluble in MC; insoluble in EtOH, AC, and other common solvents
- Purity: ≥98%
- Moisture Content: ≤0.5%
- Heat Stability: Stable up to 200℃
GLS640N Applications
Laser Safety Eyewear
GLS640N is used in laser protection glasses and goggles to block red lasers (630–650nm) while maintaining good visibility of other colors.
Security Inks & Brand Protection
Formulate into covert inks that are invisible under white light but readable with specific red-light blocking detection systems.
Automotive Lighting Filters
Used in taillight or interior lighting filters to modify color output or block unwanted red wavelengths.