# high energy photon communication

CW transmitter using 19.34 exahertz (1.93*1019 Hz) electromagnetic radiation.

The detector is a pancake Geiger–Müller tube (Mica window 44.5 mm diameter, 1.75 mg/cm). This is a bit of a joke since the detector cannot discriminate between different wavelengths (or indeed even different types of energy -- alpha and beta particles versus photons). It is basically a very wide-band detector that is unable to "tune" in the carrier wave. To compensate for signal loss and noise a very slow data rate and FEC is necessary.

# energy, frequency, electron volts

The amount of energy a photon carries is determined by its frequency (v) or wavelength (λ).

```E = h * v
or
E = h * c / λ
or
E eV = 1240 eV nm / λ nm
```

Where Planck's Constant, h = 4.135667516(91)*10−15 eV·s, and the Speed of Light, c = 299792458 m/s.

So an 80 keV x-ray beam emits photons with a peak energy of 80 keV, this the wavelength:

```  80 keV = 1240 eV nm / λ
λ = 1240 eV nm / 80 keV = 1240 eV nm / 80000 eV
λ = 1.55 * 10<sup>-11</sup> m
λ = 0.0155 nm
```

1.55*10-11 m 1.934*1019 Hz