Active resonant filter

Details Active resonant filter Active resonant filter

G - Physics

02

B

G02B 5/22 (2006.01) G01J 3/12 (2006.01)

Patent

CA 2255198

A resonant absorption cell (28) filled with a gas, selected in accordance with the wavelength of the laser radiation of interest, such as DF. The gas within the cell (28) is maintained at substantially atmospheric pressure. The energy state of the gas within the cell (28) is raised by either external resistance heating (FIG 9B) or optical pumping. In an increased energy state, gas molecules resonate with the incoming laser radiation causing the molecules to absorb incident photons before the gas molecules have a chance to re-radiate the captured photons, collisions with other gas molecules within the cell transfer the excitation energy into heat in order to filter out laser radiation but past all other wavelengths.

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