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The birds will be frightened and not to come back. Our lasers are using in many countries for farmers protecting their lands and scientists working in forests. Spartan 637nm 90mW Red Laser Pointer Control birds from 100m to 1km. This laser has a very bright red beam and very low divergence. The beam is still concentrated and bright enough to scare birds from long distance. Spartan 532nm 100mW to 300mW Green Laser Pointer control birds from 100m to 1km.
There are two different frequencies, in two entirely different contexts, involved. The infrared light generated by an infrared LED is in the 300+ GHz range, this is correct. For instance, the TSAL5400 IR LED often used in remotes has its radiation peak at 940nm wavelength, i.e. 318,930 GHz. However, IR remote controls do not output continuous infrared light. The LED output is chopped via control circuitry into pulses of a given frequency, such as 34 KHz, 38 KHz, 40 KHz or 56 KHz. The IR sensor at the other end filters incident IR at the specified frequency, and ignores any IR that does not conform to this chopping frequency or modulation. This ensures that stray infrared light, such as from sunlight, heat sources, or incandescent lamps, is ignored by the sensor, and only the correctly modulated incoming IR is acted upon.