Subsystem ‐ SPAM - UMassIonTrappers/PyOpticL GitHub Wiki

State Preparation and Measurement (SPAM) subsystem:

  • ECDL and Isolator Baseplate for laser source and optical isolation.
  • Two Double Pass (F=50) for laser frequency stabilization and laser modulation.
  • Beam Pickoff for monitoring the laser frequency.
  • Cavity Reference NOT SHOWN - cavity reference to stabilize the laser via PDH lock is not shown (see https://arxiv.org/abs/2402.16742 for more details).

This subsystem is used to optically pump and measure the Zeeman qubit states for qubit state preparation and measurement(SPAM) via an ultranarrow optical clock transition to a metastable D state. For 88Sr+ trapped ions the transition is at 674 nm.

image

https://github.com/UMassIonTrappers/PyOpticL/blob/main/Design/Subsystem/SPAM_subsystem.py

Function

def subsystem_674(x=0, y=0, angle=0, mirror=optomech.mirror_mount_km05, x_split=False, thumbscrews=True):
    
    layout.place_element_on_table("test", optomech.laser_mount_km100pm, 6.7 + x, 32 + y, 270 + angle, z=0)
    ECDL_isolator_baseplate(x=4 + x, y=26.5 + y, angle=270 + angle)
    doublepass_f50(x=12 + x, y=20 + y, angle=180 + angle, thumbscrews=True)
    doublepass_f50(x=11 + x, y=14 + y, angle=180 + angle, thumbscrews=True)
    Beam_pickoff(x=2.5 + x, y=8.5 + y, angle=-90 + angle, thumbscrews=True)
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