A long pass filter is one that transmits at longer wavelengths, rejects shorter wavelengths.  By design, the transition between the 50% cut-off or cut-on to rejection is quite sharp.  They are useful in applications where spectral noise reduction is important or for isolating a particular region of the spectrum.  They can be used in fluorescence applications to eliminate any unwanted radiation, in Raman spectroscopy as order sorting filters as well as in astronomical applications.  They are also used in laser-induced fluorescence to isolate source radiation.

 

Similar to long pass filters in applications but short pass filters transmit at shorter wavelengths and reject longer wavelengths.  Again, the transition between the 50% cut-off or cut-on to rejection is quite sharp.  This makes it much easier to separate excitation from emitted wavelengths without interfering with wavelengths of interest.

 

 

While lasers are generally assumed to emit monochromatic light, there is often unwanted radiation that the user wishes to eliminate and Optometrics' Laser Line filters are designed for this purpose.  Standard filters are designed for use with YAG, HeCd, Argon, HeNe, Krypton, Ruby and Diode lasers and are available in two standard sizes.  All are mounted in a black anodized metal ring.                  

 

Now select from our expanded range of standard interference filters which extends to 1650nm.  Our newest NIR wavelength filters (1000nm to 1650nm) are all ring mounted, have blocking to OD4 over a broad range and transmit from 65-75%.  They should be considered for applications that require a limited number of known wavelengths, when energy throughput is more critical than wavelength resolution or when cost is more important than flexibility.

Multiple Applications and Types of Filters (both traditional soft-coated filters as well as our new Ion-Assist durable hard coatings)

  

 

 

 

 

   More About Us

 

Visit our Website