AOM

Class Arguments

Argument	Type	Default Value
center_freq	TFloat
rfsource	RFSource
freq_limit	tuple	None
bandwidth	TFloat	None
switch	Switchable	None
switching_delay	TFloat	0
passes	TInt32	1
order	TInt32	1
am_calibration	Calibration	None
amp_limit	tuple	(0.0, 1.0)

Bold arguments are mandatory. For more documentation on the listed arguments refer to the class definition below. If parameters appear in this list but not in the class definition below, please recursively check the linked base classes for the definition of the parameter.

Inheritance Diagram

Example Component Dictionary

   {
    "lightmodulator_example": {
        "classname": "atomiq.components.optoelectronics.lightmodulator.AOM",
        "arguments": {
            "center_freq": "<mandatory parameter (TFloat)>",
            "rfsource": "<mandatory parameter (RFSource)>",
            "freq_limit": null,
            "bandwidth": null,
            "switch": null,
            "switching_delay": 0,
            "passes": 1,
            "order": 1,
            "am_calibration": null,
            "amp_limit": [
                0.0,
                1.0
            ]
        }
    }
}

Class Description

class atomiq.components.optoelectronics.lightmodulator.AOM(center_freq, freq_limit=None, bandwidth=None, switch=None, switching_delay=0, passes=1, order=1, am_calibration=None, *args, **kwargs)

Bases: RFLightModulator, Switchable

An acousto-optical modulator to alter amplitude, frequency and phase of the light.

A component to represent an AOM to attenuate, switch and frequency-shift light. It is controlled by an RFSource and a Switchable to rapidly switch the light on and off. As such, the AOM works also as a (non-perfect) shutter.

Parameters:

• rfsource -- The rf source that drives the AOM

• center_freq (TFloat) -- RF center frequency of the AOM in Hz.

• freq_limit (tuple) -- Tuple (freq_min, freq_max) giving the minimum/maximum RF frequency that the AOM can handle in Hz. Either freq_limit xor bandwidth must be given

• bandwidth (TFloat) -- RF bandwidth of the AOM around the center frequency in Hz. Either bandwidth xor freq_limit must be given.

• switch (Switchable) -- An optional switch to rapidly switch on and off the AOM. If none is given the rfsource is used to switch.

• switching_delay (TFloat) -- the switching delay of the AOM, i.e. the time it takes from the arrival of the TTL to having full optical power. (default 0)

• passes (TInt32) -- How often does the beam pass the AOM? Singlepass -> 1, Doublepass -> 2 (default 1)

• order (TInt32) -- The diffraction order the AOM is aligned to. -2, -1, 1, 2 ... (default 1)

• am_calibration (Calibration) -- Calibration of RF power vs output power. Typically an inverse sigmoid. (default none)

A Parametrizable is an entity that can be controlled by one or more continuous parameter(s)

set_frequency(frequency)

Set the frequency shift of the light coming out of the AOM

Parameters:

frequency (artiq.compiler.types.TMono('float', OrderedDict()))

set_detuning(detuning)

Set the frequency shift of the light coming out of the AOM relative to the center frequency

Parameters:

detuning (artiq.compiler.types.TMono('float', OrderedDict())) -- Detuning from the AOM center frequency in Hz

detune(detuning)

Alias for set_detuning()

Parameters:

detuning (artiq.compiler.types.TMono('float', OrderedDict()))

set_amplitude(amplitude)

Set the amplitude of the light after the modulator

Parameters:

amplitude (artiq.compiler.types.TMono('float', OrderedDict())) -- Relative amplitude [0 .. 1] of the light after the modulator

arb(duration, samples_amp=[], samples_freq=[], samples_det=[], samples_phase=[], repetitions=1, prepare_only=False, run_prepared=False, transform_amp=<function identity_float>, transform_freq=<function identity_float>, transform_phase=<function identity_float>)

Play Arbitrary Samples from a List

This method allows to set the output amplitude, frequency an phase according to the values specified in respective lists. The whole sequence is played in the specified duration. The pattern store in the sample list can also be repeated.

We supports a scheme to prepare the arb function before it is actually used. If that is needed, run this function with prepapre_only = True when the arb should be prepared and with run_only = True when the prepared arb should be played. In both calls the other parameters have to be passed.

Parameters:

• samples_amp (artiq.compiler.types.TMono('list', OrderedDict({'elt': artiq.compiler.types.TMono('float', OrderedDict())}))) -- List of amplitude samples. If this list is empty (default), the amplitude is not modified.

• samples_freq (artiq.compiler.types.TMono('list', OrderedDict({'elt': artiq.compiler.types.TMono('float', OrderedDict())}))) -- List of frequency samples. If this list is empty (default), the frequency is not modified.

• samples_det (artiq.compiler.types.TMono('list', OrderedDict({'elt': artiq.compiler.types.TMono('float', OrderedDict())}))) -- List of frequency samples relative to the center frequency. If this list is empty (default), the frequency is not modified. This overwrites samples_frequency

• samples_phase (artiq.compiler.types.TMono('list', OrderedDict({'elt': artiq.compiler.types.TMono('float', OrderedDict())}))) -- List of phase samples. If this list is empty (default), the phase is not modified.

• duration (artiq.compiler.types.TMono('float', OrderedDict())) -- The time in which the whole sequence of samples should be played back [s].

• repetitions (artiq.compiler.types.TMono('int', OrderedDict({'width': artiq.compiler.types.TValue(32)}))) -- Number of times the sequence of all samples should be played. (default 1)

• prepare_only (artiq.compiler.types.TMono('bool', OrderedDict()))

• run_prepared (artiq.compiler.types.TMono('bool', OrderedDict()))

on()

Turns on the AOM. The time cursor is moved back in time to accommodate the switching_delay of the AOM. After executing the on method of the defined switch the time cursor is then forwarded by switching_delay again. The time cursor advancement is therefore given by the switch.on() method.

ramp(duration, frequency_start=-1.0, frequency_end=-1.0, amplitude_start=-1.0, amplitude_end=-1.0, ramp_timestep=-1.0, ramp_steps=-1)

Ramp frequency and amplitude over a given duration.

Parameters default to -1 to indicate no change. If the start frequency/amplitude is set to -1, the ramp starts from the last frequency/amplitude which was set. This method advances the timeline by ´duration´

Parameters:

• duration (artiq.compiler.types.TMono('float', OrderedDict())) -- ramp duration [s]

• frequency_start (artiq.compiler.types.TMono('float', OrderedDict())) -- initial frequency [Hz]

• frequency_end (artiq.compiler.types.TMono('float', OrderedDict())) -- end frequency [Hz]

• amplitude_start (artiq.compiler.types.TMono('float', OrderedDict())) -- initial amplitude [Hz]

• amplitude_end (artiq.compiler.types.TMono('float', OrderedDict())) -- end amplitude [Hz]

• ramp_timestep (artiq.compiler.types.TMono('float', OrderedDict()))

• ramp_steps (artiq.compiler.types.TMono('int', OrderedDict({'width': artiq.compiler.types.TValue(32)})))

set_phase(value)

Set the phase shift of the light imposed by the modulator

Parameters:

• phase -- Phase shift in radians

• value (artiq.compiler.types.TMono('float', OrderedDict()))

set_polarisation(angle)

Set the polarization rotation imposed by the modulator

Parameters:

angle (artiq.compiler.types.TMono('float', OrderedDict())) -- Rotation angle in radians

off()

Turns off the AOM. The time cursor is moved back in time to accommodate the switching_delay of the AOM. After executing the off method of the defined switch the time cursor is then forwarded by switching_delay again. The time cursor advancement is therefore given by the switch.off() method.