GLS666 Visible Light Absorbing Dye – 666nm Peak for Deep Red and Near-Infrared Edge Filtering
GLS666 is a deep red absorbing dye with peak absorption at 666nm. It is designed for blocking red lasers in the 660–670nm range, including red diode lasers (660nm) and certain He-Ne laser lines. GLS666 also provides useful absorption extending into the near-infrared edge, making it suitable for cut-on filters and deep red rejection in imaging systems.
Key Features
Peak absorption: 666nm ± 2nm – covers 660–675nm
High optical density in deep red region
Excellent solubility in aromatic and chlorinated solvents
Good thermal stability up to 250°C
Sharp absorption edge for notch and long-pass filter design
Compatible with PMMA, PC, PS, and epoxy
Technical Specifications
Appearance: Dark purple solid powder
Absorption max (in toluene): 666nm
- Soluble: MA
Applications
Laser Safety Eyewear
Blocks 660–670nm red lasers used in laser pointers, barcode scanners, and certain medical lasers.
Optical Notch Filters for Imaging
Used in fluorescence microscopy to block deep red emission lines while passing longer wavelengths.
Long-Pass and Edge Filters
GLS666 can be combined with other dyes to create custom edge filters for spectroscopy and machine vision.
Security Inks
Create covert red-absorbing features for brand protection documents.
Frequently Asked Questions (FAQ)
Q: What is the difference between GLS666 and GLS640N?
A: GLS666 has a peak at 666nm, targeting deeper red light than GLS640N (640nm). Use GLS666 for 660nm laser blocking and edge filter applications.
Q: Can GLS666 be used for 670nm laser protection?
A: Yes. Absorption remains strong at 670nm (approximately 80% of peak).
Q: Is GLS666 fluorescent?
A: Minimal fluorescence makes it suitable for high-contrast optical applications.