diff --git a/examples/laser/inputs_chirp b/examples/laser/inputs_chirp
index 5b2d8c85bb..9db147c313 100644
--- a/examples/laser/inputs_chirp
+++ b/examples/laser/inputs_chirp
@@ -21,7 +21,7 @@ laser.focal_distance = 0.0
 laser.w0 = 5e-6
 laser.tau = 5e-14
 laser.phi2 = 2.4e-19
-laser.zeta = 2.4e-24
+laser.zeta = 0
 laser.beta = 3e-18
 laser.STC_theta_xy = 0
 amr.max_level = 0