Customize Raman Optical Filter China Manufacturer
In Raman spectroscopy equipment, filters selectively filter out unnecessary light. Filters can separate excitation light from Raman signals to avoid interference of laser light sources on Raman signals. This improves the quality and accuracy of Raman signals.
Coligh is specialized in Raman filters manufacturing. The filters include bandpass exitation filter, longpass emission filter and edge dichroic filter also some notch filters.
Our filters have advantages over:
- Efficiently block lasers and avoid interference of lasers on detection systems
- Ultra-narrow bandpass filters can select and transmit the required Raman signals and shield light of other wavelengths
- Deep cutoff blocks lasers and other stray light, and high transmittance enhances weak Raman signals to form an ultra-high signal-to-noise ratio
- Ultra-narrow bandpass filters can accurately select the wavelength range of interest and improve the resolution of Raman spectra

Raman Optical Filter Series
- Raman Filters Set
- Individual Raman Filters
Why Choose Coligh Optical Filter For Raman Spectroscopy?
- We customize Raman laser line filter, laman Edge filters,Raman bandpass filters, Raman Longpass Filter and Raman Notch filters for Raman Applications
- Above 90% transmission and OD>6 deep blocking depth
- Deep slope from high transmission to deep blocking depth to seperate the exitation and emission light
Coligh Optical Filters for Raman Spectroscopy Applications

Materials Science and Chemical Analysis
Raman filters are mainly used for molecular structure analysis, polymer and composite material research to analyze molecular structure and material changes.

Biomedicine and Life Sciences
Raman filters can help researchers and analysts obtain biological signals and make disease diagnosis by analyzing the molecular composition of cells.

Semiconductor and Electronics Industry
In thin films and nanomaterials, Raman spectroscopy can detect material quality and material characterization in the manufacturing process in real time.

Forensics
Raman filters can ensure the accurate determination of Raman scattering signals, thereby quickly identifying drugs and poisons in forensic samples.
FAQs
The center wavelength is mainly matched according to the laser wavelength, such as 532nm, 788nm, etc. The bandwidth is determined based on the characteristics of the signal to be resolved, depending on the specific application requirements.
It is recommended that the cutoff depth of a Raman filter reach OD5 or higher, as a higher OD value allows for better removal of unwanted laser light and scattered light.
We primarily use high-quality optical glass, which is then coated with a hard coating to produce the Raman filters. This ensures both excellent optical performance and durability.
For specific available sizes, please consult our sales representatives. We offer standard sizes and can also provide custom sizes upon request.
For in-stock filters, the delivery time is usually within 10 days. For custom products, the delivery time depends on the production schedule, typically ranging from 15 to 20 days.