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Free THz Tools

Spectroscopy Calculators

Instant, accurate conversions for THz researchers and engineers. No sign-up required.

Unit Converter DFG Calculator DFG Range Planner

THz Unit Converter

Convert between frequency, wavenumber, wavelength, and energy

THz
GHz
cm⁻¹
µm
nm
meV
eV
J
K

Constants: c = 299 792 458 m/s · h = 6.626 070 15 × 10⁻³⁴ J·s · kB = 1.380 649 × 10⁻²³ J/K · 1 eV = 1.602 176 634 × 10⁻¹⁹ J

DFG Frequency Calculator

Calculate difference frequency generation output from two pump sources

In difference frequency generation, two laser beams at frequencies ν1 (Pump 1) and ν2 (Pump 2) interact in a nonlinear crystal to produce radiation at νTHz = |ν1 − ν2|. Enter any two values below — the third is calculated automatically.

Pump 1 (ν1)

µm
THz
cm⁻¹

Pump 2 (ν2)

µm
THz
cm⁻¹

THz Output (ν1 − ν2)

THz
cm⁻¹
µm
meV

νTHz = |ν1 − ν2|  ·  λ = c / ν  ·  σ = ν / c  ·  E = hν

DFG Range Planner

Explore the THz frequency range achievable with your laser combination

Select a laser type for each pump source. For a CO₂ laser, pick from standard gas lines. For a tunable laser, enter its wavelength tuning range. The calculator shows the full THz output range from νTHz = |ν1 − ν2|.

Laser 1

Laser 2

THz Output Range

Select lasers to see output range

νTHz = |ν1 − ν2|  ·  Range computed from min/max of each laser source

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