Diffraction Limited Dichroic Combiner Diode Laser.
Patent, Filed 10 Nov 86, patented 18 Apr 89,
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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A laser transmitter is disclosed in which the laser combines the outputs of numerous laser diodes using dichroic combination to produce a high power, diffraction limited beam which may be transmitted at minimum beam divergence using the full aperture of the transmitter telescope. The individual diode beams are combined and superimposed in the laser, and are transmitted superimposed in the near and far field of the transmitter telescope. The dichroic combining process is as follows. A collimate beam of a first wavelength is directed at a narrowband or long wave pass filter which is tilted slightly about 10 degrees. This beam passes through the filter. A beam of a second wavelength is directed toward the exist side of the filter which acts as a mirror at such an angle that the second beam is reflected colinear with the first beam and superimposed on it. This process of superimposing the laser beams continues as each laser beam from the laser diodes is added to form a combined laser beam. Patents. RRH
- Lasers and Masers