Product Descriptions:
| Characteristics: | 560nm sapphire longpass filter |
| Type: | Interference type |
| Cut-off wavelength(in nm): | 560nm |
| Peak Transmittance(%) : | >90% |
| Surface Quality: | 60/40 scratch-dig |
| Optical Density (OD): | OD2 |
| Color: | Yellow |
| Shape： | Rectangular solid or customized. |
| Dimension(mm): | 30*11*10mm or customized. |
| Thickness(mm): | 1mm、2mm、5mm、10mm or customized. |
| Substrate: | Optical sapphire. |
| Spectral range: | 350-1100nm |
| Remark：Support customized for wavelength from 200-2000nm. |
Spectral measurement graph – 560nm sapphire longpass filter :
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| Picture 1: 560nm sapphire longpass filter |
What is function and advantage of 560nm sapphire longpass filter in IPL hair removal device?
(1) In IPL hair removal systems, a 560 nm sapphire longpass filter performs two key tasks simultaneously: it tailors the emission spectrum and assists with surface cooling. Its dielectric coating blocks wavelengths below 560 nm, ultraviolet and blue-green light that would otherwise be strongly absorbed by melanin in the epidermis-while transmitting more than 90% of yellow, red, and near-infrared wavelengths above this threshold. These longer wavelengths penetrate more deeply into the follicle, where melanin in the hair shaft absorbs them and converts the light into heat, eventually disrupting the follicle’s regenerative structures. (2)Sapphire as the substrate brings further benefits: its high thermal conductivity enables rapid heat dissipation during intense pulsed-light firing, lowering the risk of epidermal burns, while its mechanical strength and high damage threshold allow it to withstand repeated high-power pulses without degradation of its optical filtering properties, helping ensure effective and safe treatment over the device’s lifetime.
What is key parameter when choose for suitable Longpass filter?
When selecting a Longpass Filter, normally the following factors need to be taken into consideration：
- Cut-Off Wavelength: it is one of the most important parameters, typically defined as the wavelength transmittance at 50% .
- Average or Peak transmittance: usually average transmittance ≥90%, higher transmittance e.g. 92% or 95% on average or specific single point need to definite and communicate with manufacturer, higher transmittance need to additional AR coating.
- Blocking rate: usually expressed in terms of optical density(OD), OD2-OD3 for standard and higher will be OD4-OD6 per requirement
- Angle of Incidence (AOI): AOI need to be consider as Interference Filter is angle sensitive, 0° AOI by default, other AOI e.g. 30/45° need to be specified.
- Physical and environmental requirement: Substrate type, dimensions and thickness, surface quality, and environmental durability.
Shenzhen Hengda Liyuan Optoelectronics introduced advanced optical vacuum technology that apply depositing nano-materials 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. The company have been focus on optical coating for more than 17 years ,and the company offer one-stop optical filters solution including
Narrow Bandpass Filters,
IR cut-off Filters,
Longpass Filters,
Shortpass Filters,
Notch Filters,
ND filters,
Star filters and
Optical sapphire block.
Remark：Because the interference type filter varies its performance at different angles, the spectral parameters usually determine its appearance color; moreover, the pictures in this link may originate from various shooting angles, so the actual color should therefore rely on the final spectral parameters required as the standard.
