Suservo example#
Experiment
"""
SUServo Laser Example
#####################
Scenario
========
We want to control a laser that is intensity stabilized by a Sinara SUServo (Sampler + 2x Urukul with special gateware)
"""
from atomiq import AtomiqExperiment
from artiq.experiment import kernel, parallel, sequential, delay
class SuServoTest(AtomiqExperiment):
components = ["laser_suservo_test", "ttl_test", "pd_aom_test_cal"]
arguments = {
"pulse_power": {"default": 0.5},
"pulsetime": {"default": 3e-3, "unit": "ms", "scale": 1e-3},
"off_time": {"default": 0.5, "unit": "s"},
}
@kernel
def step(self, point):
# Optional: If the PI parameter set in the components definition is not what you need
# you can set a different value like so:
self.laser_suservo_test.set_servo_parameter(0, -1.0, -1.0e4, 0.0)
# Set the detuning of the laser. Depending on the `fmmod` parameter either the modulator
# or the laser source will be used for detuning
self.laser_suservo_test.set_detuning(400e6)
# Activate servo loops for our laser
self.laser_suservo_test.stabilize(True)
# Set the power level we want to stabilize on. Since the photodiode is calibrated
# we give the desired power in mW
self.laser_suservo_test.set_power(point.pulse_power)
with parallel:
# Output a test tll for triggering our instrumentation
self.ttl_test.pulse(point.pulsetime)
# Pulse on the laser
self.laser_suservo_test.pulse(point.pulsetime)
# Ramp down the intensity of the laser to half its power in half the pulsetime
self.laser_suservo_test.ramp(point.pulsetime/2, power_start=point.pulse_power,
power_end=point.pulse_power/2)
with sequential:
delay(point.pulsetime/2)
# Switch off the servo loop and hold the output power
self.laser_suservo_test.stabilize(False)
# Measure the power on the photodiode
power = self.pd_aom_test_cal.get_power()
self.log.info("Measured PD output: {0}", [power])
delay(point.off_time)
Components
# Basics
components = {
"log": {
"classname": "atomiq.components.basics.log.KernelLogger"
}
}
# Calibrations
components = {
"cal_pd_test": {
"classname": "atomiq.components.basics.LinearCalibration",
"arguments": {
"input_unit": "V",
"output_unit": "mW",
"a": 30.0,
"b": 0.0
}
}
}
# Sinara modules
components = {
"kasli0": {
"classname": "atomiq.components.sinara.Kasli",
"arguments": {}
},
"suservo0": {
"classname": "atomiq.components.sinara.suservo.SUServo",
"arguments": {
"suservo_device": "@suservo0",
}
}
}
# TTL Out
components = {
"ttl_test": {
"classname": "atomiq.components.sinara.DioOutput",
"arguments": {
"kasli": "&kasli0",
"ttl": "@ttl8"
}
}
}
# Analog in
components = {
"input_suservo_test": {
"classname": "atomiq.components.sinara.suservo.SUServoADCChannel",
"arguments": {
"suservo": "&suservo0",
"channel": 0,
"default_gain": 0
}
}
}
# Photodiodes
components = {
"pd_aom_test_cal": {
"classname": "atomiq.components.optoelectronics.photodiode.CalibratedPhotodiode",
"arguments": {
"adc_channel": "&input_suservo_test",
"calibration": "&cal_pd_test"
}
}
}
# RF Sources
components = {
"rfsource_aom_test": {
"classname": "atomiq.components.sinara.suservo.SUServoChannel",
"arguments": {
"suservo": "&suservo0",
"suservo_channel": "@suservo0_ch0",
"default_amplitude": 0.75,
"default_frequency": 220e6,
"freq_limit": (15e6, 400e6),
"blind": True
}
}
}
components = {
"aom_test": {
"classname": "atomiq.components.optoelectronics.lightmodulator.AOM",
"arguments": {
"rfsource": "&rfsource_aom_test",
"switch": "&rfsource_aom_test",
"center_freq": 200e6,
"bandwidth": 60e6,
"switching_delay": 30e-9,
"order": 1,
"passes": 2
}
}
}
# Lock
components = {
"lock_test": {
"classname": "atomiq.components.lock.SpectroscopyLock",
"arguments": {
"reference_frequency": 539e12,
"lock_offset": -60.0e6,
}
}
}
# Lasersources
components = {
"ls_test": {
"classname": "atomiq.components.laser.LockedLaserSource",
"arguments": {
"lock": "&lock_test",
"power": 900e-3
}
}
}
# Lasers
components = {
"laser_suservo_test": {
"classname": "atomiq.components.sinara.suservo.SUServoModulatedLaser",
"arguments": {
"laser_source": "&ls_test",
"photodiode": "&pd_aom_test_cal",
"modulator": "&aom_test",
"default_ki": -1.0e4,
"default_kp": -1.0
}
}
}