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.

lambda2nu has experimental support for Python Array API Standard compatible backends in addition to NumPy. Please consider testing these features by setting an environment variable SCIPY_ARRAY_API=1 and providing CuPy, PyTorch, JAX, or Dask arrays as array arguments. The following combinations of backend and device (or other capability) are supported.

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

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])