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#
# This file is part of the PyMeasure package.
#
# Copyright (c) 2013-2024 PyMeasure Developers
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
import logging
import numpy as np
from pymeasure.instruments import Instrument, SCPIUnknownMixin
from pymeasure.instruments.validators import strict_discrete_set, strict_range
log = logging.getLogger(__name__)
log.addHandler(logging.NullHandler())
WL_RANGE = [1480, 1620]
LOCK_PW = 1234
class KeysightN7776C(SCPIUnknownMixin, Instrument):
"""
This represents the Keysight N7776C Tunable Laser Source interface.
.. code-block:: python
laser = N7776C(address)
laser.sweep_wl_start = 1550
laser.sweep_wl_stop = 1560
laser.sweep_speed = 1
laser.sweep_mode = 'CONT'
laser.output_enabled = 1
while laser.sweep_state == 1:
log.info('Sweep in progress.')
laser.output_enabled = 0
"""
def __init__(self, adapter, name="N7776C Tunable Laser Source", **kwargs):
super().__init__(
adapter, name, **kwargs)
locked = Instrument.control(
':LOCK?', ':LOCK %g,' + str(LOCK_PW),
"""Control the lock state (True/False) of the laser source. (bool)""",
validator=strict_discrete_set,
map_values=True,
values={True: 1, False: 0}
)
output_enabled = Instrument.control(
'SOUR0:POW:STAT?', 'SOUR0:POW:STAT %g',
"""Control the state (on/off) of the laser source (bool)""",
validator=strict_discrete_set,
map_values=True,
values={True: 1, False: 0}
)
_output_power_mW = Instrument.control(
'SOUR0:POW?', 'SOUR0:POW %f mW',
"""Control the laser output power in mW. (float)""",
get_process=lambda v: v * 1e3
)
_output_power_dBm = Instrument.control(
'SOUR0:POW?', 'SOUR0:POW %f dBm',
"""Control the laser output power in dBm. (float)"""
)
_output_power_unit = Instrument.control(
'SOUR0:POW:UNIT?', 'SOUR0:POW:UNIT %g',
"""Control the power unit used internally by the laser. (str)""",
map_values=True,
values={'dBm': 0, 'mW': 1}
)
@property
def output_power_mW(self):
"""Control the output power in mW"""
self._output_power_unit = 'mW'
return self._output_power_mW
@output_power_mW.setter
def output_power_mW(self, new_power):
self._output_power_mW = new_power
@property
def output_power_dBm(self):
"""Control the output power in dBm."""
self._output_power_unit = 'dBm'
return self._output_power_dBm
@output_power_dBm.setter
def output_power_dBm(self, new_power):
self._output_power_dBm = new_power
trigger_out = Instrument.control(
'TRIG0:OUTP?', 'TRIG0:OUTP %s',
""" Control if and at which point in a sweep cycle an output trigger
is generated and arms the module. """,
validator=strict_discrete_set,
values=['DIS', 'STF', 'SWF', 'SWST']
)
trigger_in = Instrument.control(
'TRIG0:INP?', 'TRIG0:INP %s',
"""Control the incoming trigger response and arm the module.""",
validator=strict_discrete_set,
values=['IGN', 'NEXT', 'SWS'])
wavelength = Instrument.control(
'sour0:wav?', 'sour0:wav %fnm',
"""Control absolute wavelength of the output light (in nanometers)""",
validator=strict_range,
values=WL_RANGE,
get_process=lambda v: v * 1e9)
sweep_wl_start = Instrument.control(
'sour0:wav:swe:star?', 'sour0:wav:swe:star %fnm',
"""Control Start Wavelength (in nanometers) for a sweep.""",
validator=strict_range,
values=WL_RANGE,
get_process=lambda v: v * 1e9)
sweep_wl_stop = Instrument.control('sour0:wav:swe:stop?', 'sour0:wav:swe:stop %fnm',
"""Control End Wavelength (in nanometers) for a sweep.""",
validator=strict_range,
values=WL_RANGE,
get_process=lambda v: v * 1e9)
sweep_step = Instrument.control('sour0:wav:swe:step?', 'sour0:wav:swe:step %fnm',
"""Control step width of the sweep (in nanometers).""",
validator=strict_range,
values=[0.0001, WL_RANGE[1] - WL_RANGE[0]],
get_process=lambda v: v * 1e9)
sweep_speed = Instrument.control('sour0:wav:swe:speed?', 'sour0:wav:swe:speed %fnm/s',
"""Control speed of the sweep (in nanometers per second).""",
validator=strict_discrete_set,
values=[0.5, 1, 50, 80, 200],
get_process=lambda v: v * 1e9)
sweep_mode = Instrument.control('sour0:wav:swe:mode?', 'sour0:wav:swe:mode %s',
"""Control sweep mode of the swept laser source """,
validator=strict_discrete_set,
values=['STEP', 'MAN', 'CONT'])
sweep_twoway = Instrument.control('sour0:wav:swe:rep?', 'sour0:wav:swe:rep %s',
"""Control the repeat mode. Applies in stepped,continuous and
manual sweep mode.""",
validator=strict_discrete_set,
map_values=True,
values={False: 'ONEW', True: 'TWOW'})
_sweep_params_consistent = Instrument.measurement(
'sour0:wav:swe:chec?',
"""Get whether the currently set sweep parameters (sweep mode, sweep start,
stop, width, etc.) are consistent. If there is a
sweep configuration problem, the laser source is not
able to pass a wavelength sweep.""")
sweep_points = Instrument.measurement(
'sour0:read:points? llog',
"""Get the number of datapoints that the :READout:DATA?
command will return.""")
sweep_state = Instrument.control(
'sour0:wav:swe?', 'sour0:wav:swe %g',
"""Control state of the wavelength sweep. Stops, starts, pauses or continues a
wavelength sweep. Possible state values are
0 (not running),
1 (running) and
2 (paused).
Refer to the N7776C user manual for exact usage of the paused option. """,
validator=strict_discrete_set,
values=[0, 1, 2])
wl_logging = Instrument.control('SOUR0:WAV:SWE:LLOG?', 'SOUR0:WAV:SWE:LLOG %g',
"""Control State (on/off) of the lambda logging feature of the
laser source.""",
validator=strict_discrete_set,
map_values=True,
values={True: 1, False: 0})
def valid_sweep_params(self):
response = int(self._sweep_params_consistent[0])
if response == 0:
return True
elif response == 368:
log.warning('End Wavelength <= Start Wavelength.')
elif response == 369:
log.warning('Sweep time too small.')
elif response == 370:
log.warning('Sweep time too big.')
elif response == 371:
log.warning('Trigger Frequency too large.')
elif response == 372:
log.warning('Stepsize too small.')
elif response == 373 or response == 378:
log.warning('Number of triggers exceeds allowed limit.')
elif response == 374:
log.warning('The only allowed modulation source with lambda logging \
function is coherence control.')
elif response == 375:
log.warning('Lambda logging only works Step Finished output trigger configuration')
elif response == 376:
log.warning('Lambda logging can only be done in continuous sweep mode')
elif response == 377:
log.warning('The step size must be a multiple of the smallest possible step size')
elif response == 379:
log.warning('Continuous Sweep and Modulation on.')
elif response == 380:
log.warning('Start Wavelength is too small.')
elif response == 381:
log.warning('End Wavelength is too large.')
else:
log.warning('Unknown Error!')
return False
def next_step(self):
"""
Performs the next sweep step in stepped sweep if it is paused or in manual mode.
"""
self.write('sour0:wav:swe:step:next')
def previous_step(self):
"""
Performs one sweep step backwards in stepped sweep if its paused or in manual mode.
"""
self.write('sour0:wav:swe:step:prev')
def get_wl_data(self):
"""
Function returning the wavelength data logged in the internal memory of the laser
"""
# Using pyvisa's method bypassing the normal read.
return np.array(self.adapter.connection.query_binary_values('sour0:read:data? llog',
datatype=u'd'))
def close(self):
"""
Fully closes the connection to the instrument through the adapter connection.
"""
self.adapter.close()
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