pado.optical_element.SLM

class SLM(dim, pitch, wvl, device, polar='non')

Parameters:

• dim (tuple)

• pitch (float)

• wvl (float)

• device (str)

• polar (str)

__init__(dim, pitch, wvl, device, polar='non')

Spatial Light Modulator (SLM) optical element.

Parameters:

• dim (tuple) – Field dimensions (B, 1, R, C) for batch, channels, rows, cols

• pitch (float) – Pixel pitch in meters

• wvl (float) – Wavelength in meters

• device (str) – Device for computation (‘cpu’, ‘cuda:0’, etc.)

• polar (str) – Polarization mode (‘non’ or ‘polar’)

Examples

>>> slm = SLM(dim=(1,1,1024,1024), pitch=6.4e-6, wvl=633e-9, device='cuda:0')

set_lens(focal_length, shift_x=0, shift_y=0)

Set phase profile to implement a thin lens.

Parameters:

• focal_length (float) – Focal length in meters

• shift_x (float) – Lateral shift in x direction in meters

• shift_y (float) – Lateral shift in y direction in meters

Return type:

None

Examples

>>> slm.set_lens(focal_length=0.5, shift_x=100e-6)  # 500mm focal length, 100μm x-shift

set_amplitude_change(amplitude, wvl)

Set amplitude modulation profile of the SLM.

Parameters:

• amplitude (torch.Tensor) – Amplitude modulation profile [B, 1, R, C]

• wvl (float) – Operating wavelength in meters

Return type:

None

Examples

>>> amp = torch.ones((1,1,1024,1024)) * 0.8  # 80% transmission
>>> slm.set_amplitude_change(amp, wvl=633e-9)

set_phase_change(phase_change, wvl)

Set phase modulation profile of the SLM.

Parameters:

• phase_change (torch.Tensor) – Phase modulation profile [B, 1, R, C] in radians

• wvl (float) – Operating wavelength in meters

Return type:

None

Examples

>>> phase = torch.ones((1,1,1024,1024)) * np.pi  # π phase shift
>>> slm.set_phase_change(phase, wvl=633e-9)