GCC-2010 UV Interference Filters GCC-2020 VIS & IR Laser Interference Filters GCC-2021 High Performance Interference Filters GCC-2030 Broadband Interference Filters GCC-211 Short-Pass Filters GCC-300 Long-Pass Filters GCC-3010 Neutral Density Filters GCC-3020 Metallic Linearly Variable Neutral Density Filters GCC-3030 Metallic Circularly Variable Neutral Density Filters

Daheng Optics Filters General Optical filters transmit a certain portion of light spectrum and block the rest. They generally belong to two main categories, absorptive filters and interference or dichroic filters. They are commonly used in photography, in many optical instruments, and to colour stage lighting. Daheng Optics supplies standard and custom filter products for research and instrumentation. They are designed to offer a rapid solution with high performance at an economic price. The off-the-shelf products are dichroic filters, long-and short-pass filters, and neutral density filters....

Neutral density (ND) filters attenuate uniformly the intensity of light over a broad spectrum range. They can be absorptive or reflective type, or the combination of the two with thin metallic coating. The level of the attenuation is specified by Optical Density (OD) of the filter. OD is defined as the negative of the common logarithm of the transmission coefficient, as QD = -bg10(—) 610 100 where T is the transmission in percentage. For example, a filter with 1% transmission has an OD of 2. and^efiectors Filters Beamsplitters Long-Pass Fiters (%)uo!pa|jay (%)uoipa|jay Shot-Pass filter...

00104 China Daheng Group. Inc. www.cdhcorp.com Interference filters are fabricated by a series of thin layers of various dielectric materials sandwiched by glass substrates. When multiwavelength light passes through the filter interference occurs due to the differences in refractive index, resulting in a very high transmittance for certain wavelengths, while other wavelengths are either reflected or absorbed. For a given wavelength a very narrow bandwidth (3nm-10nm) can be obtained. Optical interference filters are angle-sensitive and should be used with normal or near normal incident light....

andTeflec'tors Filters Beamsplitters GCC-2010 UV Interference Filters Part No. Center Wavelength (nm) Peak Transmittance (%) All dimensions are in mm unless otherwise specified.

00106 China Daheng Group. Inc. www.cdhcorp.com Interference filters are fabricated by a series of thin layers of various dielectric materials sandwiched by glass substrates. When multiwavelength light passes through the filter interference occurs due to the differences in refractive index, resulting in a very high transmittance for certain wavelengths, while other wavelengths are either reflected or absorbed. For a given wavelength a very narrow bandwidth (3nm-10nm) can be obtained. Optical interference filters are angle-sensitive and should be used with normal or near normal incident light....

and^efiectors Filters Beamsplitters GCC-202009 Laser interference filters PartNo. Center Wavelength (nm) Peak Transmittance Min All dimensions are in mm unless otherwise specified.

Daheng Optics Filters GCC-2021 High Performance Interference Filters Center Wavelength Tolerance: Transmission Spectrum Width (FWHM): Minimum Peak Transmission: Out-of-Band Blocking: Center Wavelength Shifts: Diameter Tolerance: Thickness Tolerance: Flatness: Surface Quality: Clear Aperture: China Daheng Group. Inc www.cdhcorp.com All dimensions are in mm unless otherwise specified. 00108

GCC-2030 Broadband Interference Filters GCC-2030 Center Wavelength Tolerance: Transmission Spectrum Width (FWHM): Minimum Peak Transmission: Out-of-Band Blocking: Center Wavelength Shifts: Diameter Tolerance: Thickness Tolerance: Flatness: Surface Quality: Clear Aperture: GCC-2030 Broadband Interference Filters Part No. All dimensions are in mm unless otherwise specified. _| 00109 www.cdhcorp.com

Daheng Optics GCC-211 Short-Pass Filters Optical Short-pass Filters are coated on a substrate of fused silica, which allows the transmission of any wavelength shorter than the cut-off wavelength and block any wavelength longer than the cut-off. Substrate: Dimension Tolerance: Thickness: Parallelism: Flatness: Surface Quality: Clear Aperture: Transmission: Blocking: 00110 China Daheng Group. Inc. www.cdhcorp.com All dimensions are in mm unless otherwise specified.

GCC-211 Short-Pass Filters Part No. Transmission Band Blocking Band Cut-off Wavelength All dimensions are in mm unless otherwise specified. _| 00111 www.cdhcorp.com

Daheng Optics Filters GCC-300 Long-Pass Filters The substrate materials of the color filters inherently have different absorption and transmission properties across the spectrum. They are often used as long-pass and band-pass filters. It should be noted that the boundaries between passing and blocking wavelengths are less sharp than most coated filters, although peak transmission is often considerably higher. Material Dimension Tolerance Thickness Parallelism Flatness Surface Quality Clear Aperture Transmission Blocking Uniformity PartNo. Transmission Band Blocking Band Cut-off Wavelength ^ Diameter...

GCC-3010 Neutral Density Filters The metallic coatings on one side of the filter provide a nearly constant amount of transmitted energy over a wide visible and near infrared waveband. CDHC's neutral density filters are spectrally neutral from about 400nm to 1200nm. On BK7 or quartz substrates, we produce a variety of standard neutral density films with optical densities (OD) including 0.1, 0.3, 0.5, 1.0, 2.0, and 3.0 etc. The coating can be specially designed to fit most transmission requirements. We do not recommend this type of coating to be used with high power lasers due to the absorptive...

Daheng Optics Filters GCC-3010 Neutral Density Filters China Daheng Group. Inc www.cdhcorp.com Part No. Optical Density(550nm) Transmittance Dimension All dimensions are in mm unless otherwise specified. 00114