From 7563f22236332e30276cce2bcd8041d5636daff1 Mon Sep 17 00:00:00 2001
From: Laurent Mercadier <laurent.mercadier@xfel.eu>
Date: Thu, 26 Sep 2019 13:56:54 +0200
Subject: [PATCH] Adds HWP angle to power conversion
---
Laser_utils.py | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/Laser_utils.py b/Laser_utils.py
index 0af4c88..157f387 100644
--- a/Laser_utils.py
+++ b/Laser_utils.py
@@ -12,4 +12,16 @@ def positionToDelay(data, key, origin=0, invert = False, reflections=1):
'''
c_ = 299792458 *1e-9 # speed of light in mm/ps
x = -1 if invert else 1
- return 2*reflections*(data[key]-origin)*x/c_
\ No newline at end of file
+ return 2*reflections*(data[key]-origin)*x/c_
+
+def degToRelPower(x, theta0=0):
+ ''' converts a half-wave plate position in degrees into relative power
+ between 0 and 1.
+ Inputs:
+ x: array-like positions of half-wave plate, in degrees
+ theta0: position for which relative power is zero
+
+ Output:
+ array-like relative power
+ '''
+ return np.sin(2*(x-theta0)*np.pi/180)**2
--
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