Resolve "Add parameter to disable low-frequency component of laser noise"

Closes #101 (closed)

• Add parameter laser_lowf_component on Instrument to toggle the low-frequency (infrared) relaxation of laser noise

lisainstrument/noises.py

@@ -160,7 +160,7 @@ def laser(fs, size, asd=30, fknee=2E-3, shape='white+infrared'):
 
     if shape == 'white':
         return white(fs, size, asd)
-    elif shape == 'white+infrared':
+    if shape == 'white+infrared':
         return white(fs, size, asd) + infrared(fs, size, asd * fknee**2)
     raise ValueError(f"invalid laser noise spectral shape '{shape}'")