Following is a short review of Optical filters specifications to assist you in formulating requirements for your particular application. 

Center wavelength
Center wavelength (CWL) is the arithmetic mean of the pass band expressed in nanometers. For example, a HeNe Laser would have a center wavelength of 632.8nm.

Center Wavelength tolerance: ± FWHM 

Percent Transmission 
Percent transmission is the amount of power received by the detector compared to the total power received. Or Percentage of light pass in particular Wavelength 

Bandpass 
It is the width of the pass band, measured in nm, at the half-power points of the pass band. It is often expressed as Full Width at Half maximum (FWHM). Tolerance: ±20% of FWHM. Bandpass shape It can vary from triangular to nearly square. The number of cavities in a filter describes the overall spectral shape. 

Out-of-band rejection
out-of-band rejection (Blocking), is the amount of the energy , outside the filter pass band, transmitted through the filter. it is often expressed as an absolute level. For example 10-4 , means transmission outside the pass band is 0.01% , Unit: Optical Density (O.D.). 

Filter Dimension
Filter dimension are specified in inches or millimeter along with tolerance. Surface Quality: 80-50 scratch-dig.

Please Give Following information while sending the Order or Enquiry :

Center Wavelength: ?
FWHM : ? 
Percent Transmission :?
Size: in Diameter :?
Thickness:?

OPTICA ' s filter are designed for operation at 23 degrees Celsius, these filters can be used throughout the temperature range of -50 to +100 degrees Celsius as long as thermal shock is avoided.