Product Descriptions:
| Characteristics: | BG39 BG40 Blue Glass |
| Type: | Selective Absorption Type Glass |
| Color: | Blue |
| Cut-off wavelengths(nm) | BG39: 600nm BG40:635nm |
| Minimum Transmissivity(%): | See Technical Requirements Table below |
| Shape : | Round or customized* |
| Dimension(in mm): | Customized** |
| Thickness(mm): | 2mm or Customized*** |
| Material: | BG39 BG40 Blue Glass |
| Spectral range: | 380-1100nm |
| Remark: |
| * Shape: Rectangle, Square or customized. |
| **Common for 86x86mm, 80x80mm, max. 300x300mm |
| ** Optional thickness: 0.21、0.3、0.55、0.7、1.0、1.1、2.0、3.0mm…etc. |
Spectral Graph for BG Blue Glass :
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| Picture 1: BG39 BG40 Blue Glass Spectral Graph |
BG Blue Glass Characteristics:
| 1. Basic Characteristics Table |
| Type | Thickness (mm) | A[2856K] | D65 | Chemical Stability | ND | α×10⁻⁷ (/℃) | Tg | Ts | S |
| x | y | Y | x | y | Y | DA | DW |
| BG39 | 2 | 0.364 | 0.431 | 66 | – | – | – | 6 | 5 | 1.512 | 97 | 322 | – | 2.74 |
| BG40 | 2 | 0.471 | 0.418 | 80 | – | – | – | 6 | 5 | 1.532 | 98 | 452 | – | 2.76 |
| 2. Technical Requirements Table | | | | |
| Type | Thickness (mm) | 350(nm) | 405(nm) | 514(nm) | 633(nm) | 694(nm) | 1060(nm) | Model | Bubble | Stripe | Stress |
| BG39 | 2 | ≥46.6 | ≥78.8 | ≥86.4 | ≤22 | ≤1.9 | ≤0.1 | BG39 | C-B | 3C | 3 |
| BG40 | 2 | ≥69.3 | ≥84.4 | ≥88.8 | ≤28.8 | ≤3.9 | ≤0.1 | BG40 | C-B | 3C | 3 |
What is typical application for BG39 BG40 Blue Glass Blue glass?
| Application Area | Specific Use Cases | Primary Function |
| Digital Imaging & Camera Systems | Smartphone/DSLR camera IR-cut filters, security surveillance cameras, machine vision cameras | Eliminate color shift and chromatic aberration; enhance color fidelity and image sharpness; correct for sensor sensitivity to IR light |
| Biomedical & Life Sciences | Fluorescence microscopy, flow cytometry, confocal laser scanning microscopes, diagnostic medical imaging | Spectral isolation of blue/green excitation wavelengths; block red/IR background fluorescence; boost signal-to-noise ratio for high-sensitivity biological assays |
| Industrial Machine Vision & Inspection | Automated Optical Inspection (AOI) for PCBs, food sorting/quality control, print inspection, barcode/QR code readers | Selective blue/green band filtering to highlight target features; suppress red/yellow ambient light interference; improve defect detection accuracy and contrast |
| Optical Instrumentation & Spectroscopy | Spectrophotometers, colorimeters, optical lens assemblies, astronomical observation filters, laser line filters | Precise wavelength control for spectral calibration; block out-of-band red/IR light; ensure accurate color and intensity measurements in analytical instruments |
| Photography & Cinematography | Professional camera color correction filters, landscape photography, artistic color grading | Color temperature adjustment to enhance blue tones; suppress red wavelengths for improved contrast; achieve creative color effects in film and photography |
What is the difference between Color Filter Glass and Interference coated filter glass?
Color Filter Glass is an optical filter made by doping molten glass with metal oxides or rare-earth elements, causing it to absorb specific wavelengths and transmit others, which gives it its color. Interference Coated Filter Glass is a glass substrate with thin-film layers that uses optical interference to selectively transmit or reflect specific wavelengths. In short, interference filters are for high-precision applications, while color filter glass is often used for simpler, cost-effective filtering.
| (1) Interference Filters | (2) Colored Glass Filters |
 |  |
| Interference Filters, or thin-film filters, work by using wave interference. Multiple ultra-thin layers on a substrate are designed to reflect unwanted wavelengths, while constructively let the desire wavelengths to pass through. | Colored Glass Filters work by absorption. Dyes or metal ions inside the glass absorb unwanted light colors, allowing only the desired color light to pass through. They are more simple and only some certain wavelengths. |
Shenzhen Hengda Liyuan Optoelectronics introduced advanced optical technology that apply depositing nanomaterials through ion-assisted evaporation onto a multilayer hard film in a high vacuum environment which coating layer is firm and has good tightness, and small bandwidth drift. Liyuan optoelectronics have been focus on optical coating for more than 17 years and offer one-stop optical filters solution including Narrow Bandpass Filters, IR cut-off Filters, Longpass & Short Filters, Notch Filters, ND filters, Star filters and Optical sapphire block.
Shenzhen Hengda Liyuan Optoelectronics is focus on optical coating and optical filters solution, can provide but cut-off type glass and selective Absorption type glass.
- Cut-off Type Glass: Ultraviolet Glass, Golden(Yellow) Glass, Red Glass, Infrared Glass
- Selective Absorption Type Glass: Ultraviolet Glass, Violet Glass, Green Glass, Golden(Yellow)Glass, Red Glass, Infrared Glass, Protective Glass and Heat absorbing Glass.
