scipy.constants.

lambda2nu#

scipy.constants.lambda2nu(lambda_)[source]#

Convert wavelength to optical frequency.

Parameters:

lambda_array_like: Wavelength(s) to be converted.

Returns:

nufloat or array of floats: Equivalent optical frequency.

Notes

Computes nu = c / lambda where c = 299792458.0, i.e., the (vacuum) speed of light in meters/second.

Array API Standard Support

lambda2nu has support for Python Array API Standard compatible backends in addition to NumPy. The following combinations of backend and device (or other capability) are supported.

Library	CPU	GPU
NumPy	✅	n/a
CuPy	n/a	✅
PyTorch	✅	✅
JAX	✅	✅
Dask	✅	n/a

See Support for the array API standard for more information.

Examples

>>> from scipy.constants import lambda2nu, speed_of_light
>>> import numpy as np
>>> lambda2nu(np.array((1, speed_of_light)))
array([  2.99792458e+08,   1.00000000e+00])