The 720nm bandpass filter is an optical component that allows specific wavelengths of light around 720nm to pass through while blocking other wavelengths. It belongs to the category of interference filters. Its core function is similar to an "optical sieve," utilizing the interference effect of multi-layer thin films to precisely select light within the target wavelength range. It is widely used in optical detection, medical instruments, infrared imaging, and other fields.

Key Technical Parameters of the 720nm Bandpass Filter

Core Performance Indicators

• Center Wavelength (CWL): 720nm, which is the peak wavelength of light allowed to pass through the filter. It can be fine-tuned according to requirements.
• Full Width at Half Maximum (FWHM): Typically 10nm to 100nm (e.g., 715nm-725nm). The narrower the bandwidth, the higher the wavelength selectivity, making it suitable for high-precision spectral analysis.
• Peak Transmittance: 70% to 90%, indicating the efficiency of light transmission at the 720nm wavelength. It can be optimized based on customer needs.
• Blocking Depth: Out-of-band light transmittance is typically as low as 0.01% to 0.5% (e.g., T0.01%), effectively suppressing stray light interference.