Bandpass Filter CWL–Temperature Shift
Center Wavelength CWL₀ (nm)
Nominal center wavelength at the reference temperature (25 °C). Allowed range: 193 to 1940 nm.
Temperature (°C)
Operating temperature. Allowed range is clamped to -100 to 150 °C.
TC = 0.015 nm/°C
T
ref
= 25 °C
CWL(T) = CWL₀ + (T − T
ref
) × TC
First-order linear model; positive TC shifts CWL to longer wavelengths. Source: Iridian Spectral Technologies, "Wavelength budgeting for optical filters" (2021), ΔWL
Temp
= Tc × (Max Temp − Min Temp),
view source
.
CWL(T) =
—
nm
Shift Δ =
—
nm from CWL₀
Δ is relative to CWL₀. Positive values indicate red-shift; negative values indicate blue-shift.