slmsuite.hardware.slms.santec.Santec
- class Santec(slm_number=1, display_number=2, verbose=True, **kwargs)[source]
Bases:
SLM
Interfaces with Santec SLMs.
- slm_number
USB port number assigned by Santec SDK.
- Type
int
- display_number
Display number assigned by Santec SDK.
- Type
int
- optionboard_id
ID of the option board
- Type
str
- driveboard_id
ID of the drive board
- Type
str
- product_code_id
Product code of the device
- Type
str
Methods
See
SLM.close()
.Read the drive board and option board errors.
Gets
SLM_STATUS
return from a Santec SLM and parses the result.Read the drive board and option board temperatures.
Discovers the names of all the displays.
Load phase correction provided by Santec from file, setting
phase_correction
.Fourier transforms the wavefront calibration's measured amplitude to find the expected diffraction-limited perfomance of the system in
"knm"
space.Sets
measured_amplitude
used for hologram generation in the absence of a proper wavefront calibration.Approximates the expected radius of farfield spots in the
"kxy"
basis based on the near-field amplitude distributionmeasured_amplitude
.Checks, cleans, and adds to data, then sends the data to the SLM and potentially waits for settle.
Write the phase image contained in a .csv file to the SLM.
- __init__(slm_number=1, display_number=2, verbose=True, **kwargs)[source]
Initializes an instance of a Santec SLM.
- Parameters
slm_number – See
slm_number
.display_number – See
display_number
.verbose (bool) – Whether to print extra information.
kwargs – See
SLM.__init__()
for permissible options.
Note
Santec SLMs can reconfigure their phase table: the correspondence between grayscale values and applied voltages. This is configured based upon the wavelength supplied to
SLM.wav_design_um
. This allowsSLM.phase_scaling
to be one if desired, and make use of optimized routines (see :meth`.write()`). However, sometimes setting the phase table runs into issues, where the maximum value doesn’t correspond to exactly \(2\pi\) at the target wavelength. This is noted in the initialization, and the user should updateSLM.wav_design_um
or otherwise to avoid undesired behavior.Caution
Santec
defaults to 8 micron SLM pixel size (SLM.dx_um
=SLM.dy_um
= 8) and 10-bitSLM.bitdepth
. This is valid for SLM-200, SLM-210, and SLM-300, but may not be valid for future Santec models.
- static info(verbose=True)[source]
Discovers the names of all the displays. Checks all 8 possible supported by Santec’s SDK.
- Parameters
verbose (bool) – Whether to print the discovered information.
- Returns
The number and name of each potential display.
- Return type
list of (int, str) tuples
- load_vendor_phase_correction(file_path, smooth=False, overwrite=True)[source]
Load phase correction provided by Santec from file, setting
phase_correction
.- Parameters
file_path (str) – File path for the vendor-provided phase correction.
smooth (bool) – Whether to apply a Gaussian blur to smooth the data.
overwrite (bool) – Whether to overwrite the previous
phase_correction
.
Note
This correction is only fully valid at the wavelength at which it was collected.
- Returns
phase_correction
, the Santec-provided phase correction.- Return type
numpy.ndarray
- close()[source]
See
SLM.close()
.
- get_temperature()[source]
Read the drive board and option board temperatures.
- Returns
Temperature in Celsius of the drive and option board
- Return type
(float, float)
- get_error(raise_error=True, return_codes=False)[source]
Read the drive board and option board errors.
- Parameters
raise_error (bool) – Whether to raise an error (if True) or a warning (if False) if error(s) are detected.
return_codes (bool) – Whether to return an error string or integer error codes (in
(drive_error, option_error)
form).
- Returns
List of errors.
- Return type
list of str OR (int, int)
- get_status(raise_error=True)[source]
Gets
SLM_STATUS
return from a Santec SLM and parses the result.- Parameters
raise_error (bool) – Whether to raise an error (if True) or a warning (if False) when status is not
SLM_OK
.- Returns
Status in
(num, name, note)
form.- Return type
(int, str, str)
- write_csv(filename)[source]
Write the phase image contained in a .csv file to the SLM. This image should have the size of the SLM.
- Parameters
filename (str) – Path to the .csv file.
- point_spread_function_knm(padded_shape=None)[source]
Fourier transforms the wavefront calibration’s measured amplitude to find the expected diffraction-limited perfomance of the system in
"knm"
space.- Parameters
padded_shape ((int, int) OR None) – The point spread function changes in resolution depending on the padding. Use this variable to provide this padding. If
None
, do not pad.- Returns
The point spread function of shape
padded_shape
.- Return type
numpy.ndarray
- set_measured_amplitude_analytic(radius, units='norm')[source]
Sets
measured_amplitude
used for hologram generation in the absence of a proper wavefront calibration.FourierSLM
includes capabilities for wavefront calibration viawavefront_calibrate()
. This process also measures the amplitude of the source on the SLM and stores this inmeasured_amplitude
.measured_amplitude
is used for better refinement of holograms during numerical optimization. If one does not have a camera to use forwavefront_calibrate()
, this method allows the user to set an approximation of the source amplitude based on an assumed \(1/e\) amplitude (\(1/e^2\) power) Gaussian beam radius.- Parameters
radius (float) – Radius in normalized units to assume for the source Gaussian beam.
units (str in {"norm", "nm", "um", "mm", "m"}) – Units for the given radius.
- Returns
- Return type
numpy.ndarray
- spot_radius_kxy()[source]
Approximates the expected radius of farfield spots in the
"kxy"
basis based on the near-field amplitude distributionmeasured_amplitude
.- Returns
Average radius of the farfield spot.
- Return type
float
- write(phase, phase_correct=True, settle=False)[source]
Checks, cleans, and adds to data, then sends the data to the SLM and potentially waits for settle. This method calls the SLM-specific private method
_write_hw()
which transfers the data to the SLM.Warning
Subclasses implementing vendor-specific software should not overwrite this method. Subclasses should overwrite
_write_hw()
instead.Caution
The sign on
phase
is flipped before converting to integer data. This is to convert between the ‘increasing value ==> increasing voltage (= decreasing phase delay)’ convention in most SLMs andslmsuite
’s ‘increasing value ==> increasing phase delay’ convention. As a result, zero phase will appear entirely white (255 for an 8-bit SLM), and increasing phase will darken the displayed pattern. If integer data is passed, this data is displayed directly and the sign is not flipped.Important
The user does not need to wrap (e.g.
numpy.mod(data, 2*numpy.pi)
) the passed phase data, unless they are pre-caching data for speed (see below).write()
uses optimized routines to wrap the phase (see the private method_phase2gray()
). Which routine is used depends onphase_scaling
:phase_scaling
is one.Fast bitwise integer modulo is used. Much faster than the other routines which depend on
numpy.mod()
.phase_scaling
is less than one.In this case, the SLM has more phase tuning range than necessary. If the data is within the SLM range
[0, 2*pi/phase_scaling]
, then the data is passed directly. Otherwise, the data is wrapped by \(2\pi\) using the very slownumpy.mod()
. Try to avoid this in applications where speed is important.phase_scaling
is more than one.In this case, the SLM has less phase tuning range than necessary. Processed the same way as the
phase_scaling
is less than one case, with the important exception that phases (after wrapping) between2*pi/phase_scaling
and2*pi
are set to zero. For instance, a sawtooth blaze would be truncated at the tips.
Caution
After scale conversion, data is
floor()
ed to integers withnp.copyto
, rather than rounded to the nearest integer (np.around()
equivalent). While this is irrelevant for the average user, it may be significant in some cases. If this behavior is undesired consider either:write()
integer data directly or modifying the behavior of the private method_phase2gray()
in a pull request. We have not been able to find an example ofnp.copyto
producing undesired behavior, but will change this if such behavior is found.- Parameters
phase (numpy.ndarray or None) –
Phase data to display in units of \(2\pi\), unless the passed data is of integer type and the data is applied directly.
If
None
is passed towrite()
, data is zeroed.If the array has a larger shape than the SLM shape, then the data is cropped to size in a centered manner (
unpad
).If integer data is passed with the same type as
display
(np.uint8
for <=8-bit SLMs,np.uint16
otherwise), then this data is directly passed to the SLM, without going through the “phase delay to grayscale” conversion defined in the private method_phase2gray()
. In this situation,phase_correct
is ignored. This is error-checked such that bits with greater significance than the bitdepth of the SLM are zero (e.g. the final 6 bits of 16 bit data for a 10-bit SLM). Integer data with type different fromdisplay
leads to a TypeError.
Usually, an exact stored copy of the data passed by the user under
phase
is stored in the attributephase
. However, in cases wherephase_scaling
not one, this copy is modified to include how the data was wrapped. If the data was cropped, then the cropped data is stored, etc. If integer data was passed, the equivalent floating point phase is computed and stored in the attributephase
.phase_correct (bool) – Whether or not to add
phase_correction
tophase
.settle (bool) – Whether to sleep for
settle_time_s
.
- Returns
display
, the integer data sent to the SLM.- Return type
numpy.ndarray
- Raises
TypeError – If integer data is incompatible with the bitdepth or if the passed phase is otherwise incompatible (not a 2D array or smaller than the SLM shape, etc).