scipy.constants.

nu2lambda#

scipy.constants.nu2lambda(nu)[source]#

Convert optical frequency to wavelength.

Parameters:

nuarray_like: Optical frequency to be converted.

Returns:

lambdafloat or array of floats: Equivalent wavelength(s).

Notes

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

nu2lambda 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 nu2lambda, speed_of_light
>>> import numpy as np
>>> nu2lambda(np.array((1, speed_of_light)))
array([  2.99792458e+08,   1.00000000e+00])