qpms/constants.py

   1 # unit conversions, mostly for standalone usage
   2 # TODO avoid importing the "heavy" qpms parts
   3 from scipy.constants import epsilon_0 as ε_0, c, pi as π, e as eV, hbar, hbar as ℏ, mu_0 as μ_0
   4 pi = π
   5 μm = 1e-6
   6 nm = 1e-9
   7 # "SCUFF FREQUENCY UNIT"
   8 SU = 3e14
   9 SCUFF_OMEGAUNIT = SU
  10
  11 #freqs = freqs_weirdunits * c / μm
  12
  13 def nm2eV(lambda_nm, n = 1):
  14     return 2*π*c/(n * lambda_nm * nm) / (eV / ℏ)
  15
  16 def eV2nm(e_eV, n = 1):
  17     return 2*π*c/(n * e_eV * (eV/ℏ)) / nm
  18
  19 def SU2eV(e_SU):
  20     '''
  21     Scuff frequency units to eV.
  22     '''
  23     return e_SU * SU / (eV / ℏ)
  24
  25 def eV2SU(e_eV):
  26     return e_eV * (eV / ℏ) / SU
  27
  28 def SU2nm(e_SU, n = 1):
  29     return 2*π*c/(n * e_SU * SU) / nm
  30
  31 def nm2SU(lambda_nm, n = 1):
  32     return 2*π*c/(n * lambda_nm * nm) / SU
  33