Optical Filters
Optical Filters transmit light within a selective range of wavelengths, operating on the fundamental rules of interference, absorption, and transmission of light. The core of designing optical filters is the engineering and utilization of the refractive indices, materials characteristics, and even arrangement patterns of coatings, dyes, and substrates so that the optical media becomes transmissive or reflective to certain bands of wavelengths or a specific line of wavelength to meet specific spectral selection requirements. Optical filters serve as indispensable components in manipulating the spectral characteristics of light, offering selective transmission, reflection, or absorption of light across specific wavelengths or spectral regions. The applications are manifold, ranging from photographic, fluorescence microscopes, spectroscopes, biochemical, machine vision inspection, and astronomical, etc.
Hangzhou Shalom EO offers a series of Off-the-shelf and Custom Optical Filters, including Bandpass Filters, Longpass Filters, Shortpass Filters, Fluorescence Filters, Neutral Density Filters, Dichroic Filters, Notched Filters, Colored Glass Absorptive Filters, IR Filters, Laser line Filters, Machine Vision Filters, Linear Variable Filters, and Multispectral Filters, and Pixel Level Filters.
Shalom EO is a professional supplier of optical filters adept at providing a vast selection of high-performance optical filters, from Bandpass to Longpass, Shortpass, Fluorescence, Neutral Density, and beyond, our extensive range caters to diverse needs. Harnessing cutting-edge advancements in a combination of optical engineering, coating, and processing techniques, we aim to optimize the selection and separation capabilities of our optical filters, a maximum optical density of OD6 can be obtained. Our filters also boast outstanding durabilities, crafted to withstand the rigors of demanding environments, supporting professionals across various fields to elevate the optical potential.
Bandpass Filter allows light in a specified band to pass through, while light outside the band is rejected. The light-transmitting band could be located in the UV, VIS, and IR spectral regions according to requirements. In Shalom EO, there is a wide available central wavelength selection range of 200-10500nm, from Ultra-Violet (UV) to Visible and Infrared (IR) spectrum, with a conventional bandwidth of 10 nm (narrower bandwidths could be obtained upon request).
A Neutral Density Filter is a filter that reduces or modifies the intensity of all wavelengths, or colors, of light homogeneously, giving no changes in the hue of color rendition. Shalom EO offers a wide variety of Neutral Density Filters for Ultraviolet, Visible, and Infrared spectrum.
Dichroic Filters transmit the wanted portion of wavelengths while other wavelengths are reflected, thus being especially suited for precise scientific work, since their exact color range can be controlled by the thickness and sequence of the dielectric interference coatings. Shalom EO offers various Dichroic filters including Longpass Dichroic filters (cut-on wavelength 500-900nm, AOI 45°), Shortpass Dichroic filters (cut-off wavelength 650-950nm, AOI 45°), Dichroic filters for RGB light show, Laser line Dichroic filters (various HR or HT coatings at specific wavelengths, AOI 45°).
Optical Notch Filter is also known as a Band Stop filter or Band Reject Filter which separates the spectrum into sections. The light is rejected/blocked in a specific wavelength range named the stop band wavelength range, while passing above and below this band. Shalom EO offers notched filters with lower transmission at rejected wavelength ranges from OD4 to OD6, and high transmission of a minimum of 90% at the transmitting wavelength range (transmission rate could be even greater than 90% available upon custom requests ).
Absorptive Filters absorb specific wavelengths of electromagnetic radiation, However, because the unwanted portion of light is absorbed, the filters are susceptible to damage induced by heat and, therefore are not competent for high-power applications. Shalom EO offers optical glass filters with high durability and steadiness reliable under various conditions and for manifold applications. Our standard or customized glass modules offered by Chinese suppliers are identical to those produced by SCHOTT or HOYA.
IR Filters are for infrared (IR) applications, with a corresponding wavelength of interest that covers the whole IR range of 0.9μm - 12μm. Any wavelength within the range could be blocked or transmitted/isolated according to your needs, with a high transmission rate that peaks at 98%.
Laser Line Filters are optical filters designed to transmit a narrow band of wavelengths with the transmission peaking at the center laser wavelength. Shalom EO offers laser line filters suitable for various laser types including N2, XeF, Ar, Nd-YAG, GaAIAs, HeNe, etc., with high peak transmissions of >80%, bandwidth of maximum 10nm, and large temperature operation range from -50℃ to 80℃ fit under working different condition.
Biochemical Optical Filters are advanced components utilized in diverse scientific and medical applications to transmit or block specific wavelengths of light, depending on their interaction with biological molecules and compounds.
Machine Vision Filters are optical filters used to control light entering a machine vision system. We offer standard and custom machine vision filters for integration into a range of applications. Regarding the standard filters, we offer a large stock of Bandpass Filters. Regarding the custom filters, we provide various filter types, including Shortpass Filters, Longpass Filters, Neutral Density Filters, and Color filters.
A series of optical filters with special designs including linear variable filters with variable central/edge wavelengths, multispectral filters for selection of multiple wavebands, and pixel level filters are also available in Hangzhou Shalom EO.
