LP930nm Longpass Filter NIR High Transmission Industrial Imaging Core Component

LP930 nm Long-Pass Filter (Long-Pass 930 nm)

1. Core Function
   Achieves a "hard" transition at 930 nm:
   • Transmission: 940-1100 nm, Tavg > 90 %
   • Blocking: 200-920 nm, depth OD4-OD6 (T<0.01 %)
   Provides a clean passband for 940 nm LED, 980 nm laser, or 1064 nm light sources while completely blocking visible to near-infrared stray light.

2. Spectral and Process Specifications
   • Cut-off Wavelength: 930 nm ± 5 nm (T50 %)
   • Transition Steepness: ≤ 15 nm (T5 %→T80 %)
   • Peak Transmission: ≥ 92 % (typically at 940 nm)
   • Material Options: K9, BK7, B270, D263T, JGS1, Sapphire
   • Surface Quality: 60-40 scratch-dig; Surface Figure λ/4 @ 632.8 nm
   • Coating: Ion-Assisted Hard Coating (IAD), withstands 500 alcohol wipes, -40 ℃ to +85 ℃ cycling for 48 h without delamination

3. Typical Applications
   • Facial Recognition & Palm Vein Access Control: Paired with 940 nm LED, eliminates ambient light interference below 850 nm, improving liveness detection accuracy
   • Machine Vision Barcode/Logistics: Works with 940 nm or 980 nm illumination to penetrate transparent or semi-transparent packaging, directly reading internal barcodes and QR codes
   
   • Medical & Beauty: Used in 980 nm semiconductor laser hair removal and physiotherapy equipment, blocks visible light leakage from the treatment head, ensuring safety for patients and operators
   • Drone/Vehicle TOF: Paired with 940 nm VCSEL, suppresses daylight background, enabling accurate ranging up to 30 m

4. Selection and Customization
   • Steeper Transition: HP High-Steepness Version (transition band ≤ 10 nm)
   • Custom Shapes: Round wafers φ3-110 mm, square pieces 5×5-146×146 mm, with options for drilling, chamfering, and screen printing
   • Combined Functions: Can be coated with 940 nm or 980 nm anti-reflection coating on the backside to meet dual-band system requirements