632.8/10nm Bandpass Laser Filter For HeNe
632.8/10nm Bandpass Laser Filter is a narrow bandpass filter specially design for Helium-Neon Laser. Coligh manufactures 254nm to 1550nm laser filters.
- Special design for Helium-Neon
- Center wavelength 632.8nm
- FWHM 10nm
- Blocking depth OD4
632.8/10nm Bandpass Laser Filter Description
The 632.8/10nm bandpass laser filter is a narrowband filter designed for HeNe lasers. The center wavelength of this filter is 632.8+/-2nm, which accurately matches the 632.8nm standard wavelength of HeNe lasers. The half-bandwidth is 10+/-2nm, the passband range is 627.8-637.8nm, and the transmittance in the passband range is >80%. At the same time, it can deeply suppress stray light, with a cutoff depth of OD4 outside the passband within the range of 200-1100nm, which completely suppresses ambient light and laser secondary peak interference.
632.8/10nm Bandpass Laser Filter Technical Datasheet
| Parameter | Specification |
| Center Wavelength (CWL) | 632.8 nm ± 2 nm |
| Bandwidth (FWHM) | 10 nm ± 2 nm |
| Peak Transmission | ≥ 80% |
| Blocking Range | OD4 from 200 nm to 1100 nm |
| Suitable laser | HeNe laser |
| Substrate Material | Fused silica / Optical glass |
| Surface Quality | 80-50， 60-40， 40-20 scratch-dig (per MIL-PRF-13830B) |
| Clear Aperture | > 90% of the diameter |
| Filter Diameter | Customizable (e.g.2.0mm, 12.5 mm, 25 mm, 50 mm) |
| Coating Type | Hard-coated, ion-Assisted coating |
| Angle of Incidence (AOI) | 0° (normal incidence) |
| Durability | MIL-STD-810E, Method 507.3 compliant |
| Tempreture | -40℃- +60℃ |
632.8/10nm Bandpass Laser Filter Applications
HeNe laser refers to Helium-Neon Laser, which is the most classic and widely used gas laser. 632.8/10nm is specially designed for HeNe laser and has important applications in the following industries:
- Holographic imaging
The 632.8/10nm filter can be used in HeNe laser holographic imaging system to filter out ambient stray light and only transmit 632.8nm holographic reconstruction light to improve image contrast and resolution. - Flow cytometry
This filter separates the far-red light signal excited by HeNe laser (632.8nm), such as the 780nm emission light of APC-Cy7 dye, to avoid crosstalk with other fluorescent channels. - Laser barcode scanner
This filter can be integrated into the HeNe laser scanner to suppress ambient light interference and improve the recognition rate of low-contrast barcodes
