RamanResponseFusedSillica - Raman response spectrum
 
 [ vRamanResponseSpectrumDt, fr ] = RamanResponseFusedSillica(hSpace)
 [ vRamanResponseSpectrumDt, fr ] = RamanResponseFusedSillica(hSpace, sType)
 
  vRamanResponseSpectrumDt is the spectrum of Raman Response
  (Green's) function shifted (zero freq at index 1) and with
  reverse frequency ordering (deffinition like in CTimeDimension)
 
  sType = 'simple' (defauld)
  simple is exp(-t/32e-15) * sin(t*12.2e-15)
  Detailed explanation goes here