High Speed Analog, Phase Only – up to 2 kHz

Meadowlark Optics’ Liquid Crystal on Silicon (LCoS) Spatial Light
Modulators (SLMs) are uniquely designed for pure phase applications andincorporate analog data addressing with high refresh rates (1400 Hz). This
combination provides users with the fastest response times with high phasestability. The 1024 x 1024 SLM is good for applications requiring high speed,high diffraction efficiency, low phase ripple and high-power lasers.

High Phase Stability – Making an LCOS SLM faster usually means thephase stability is worse. However, we’ve combined our traditional analog
drive scheme with new proprietary technologies to suppress phase

SLM Featuresinstabilities to 0.05% to 2.0% without compromising speed. Phase ripple is•••quantified by measuring the variation in intensity of the 1st order diffracted

High resolution

spot as compared to the mean intensity while writing a blazed phase grating
to the SLM. Since phase stability varies as a function of pixel voltage, thismeasurement approach is an average and does not represent all scenarios. If

High speed
High Phase Stability

your application requires extremely low phase ripple, please contact aPure analog phase control

Meadowlark Solutions Engineer for more information on the 19x12 SLMHigh first order efficiency
High reflectivity
High power handling
On-board Memory

Wavelengths from 488-1650 nm

Software Features•••Input and Output Triggers
Image Generation
Automated Sequencing

Wavefront Calibration
Typical data showing phase stability of the HSP1K-488-800 at 532 nm

Global and Regional Look Up Tables
Temperature Monitoring
Look-up-table Calibration Kit

DS06.22

POLARIZERS • SPATIAL LIGHT MODULATORS • WAVEPLATES • LIQUID CRYSTAL DEVICES • OTHER CAPABILITIES

Spatial Light Modulator – 1024 x 1024

backplane to enable high speed operation while simultaneously maximizing phase stability. The 1024 x 1024 SLM isincredibly fast with liquid crystal response times ranging from 0.6 to 8 ms (wavelength dependent) for a full wave ofmodulation. In our ultra-high speed model customers can control the temperature set point to find the perfectbalance between switching speed and phase stability.

Tunable temperature control to balance speed and stability
ResponseTime vs.ModelTemperature(Typical)
Ultra-HighSpeed:UHSP1K-488-800
10.90.8

Intensity (a.u.)

OTHER CAPABILITIES • LIQUID CRYSTAL DEVICES • WAVEPLATES • SPATIAL LIGHT MODULATORS • POLARIZERSHigh Speed with High Phase Stability - Great care was taken in the design of the 1024 x 1024 silicon

0.7
0.6
0.5
0.4
0.3
0.2
0.1
00

0.25

0.5

0.75

11.25

1.5

1.75

22.25

Time (ms)
33 °C

43 °C

53 °C

63 °C

75 °C

Sub-millisecond liquid crystal response times are measured in the far field. Images
applied to the SLM are toggled between an 8-pixel, 2π phase grating and a solid image.
Data captured while operating from 33°C to 75°C, using 10 to 90% reference levels.
Results show typical switching speeds and phase stability at 532 nm.

TEC Heater
Part Number TCS2
Thermoelectric Cooler (TEC) gives the user control over the temperature in which to operate the SLM. Heating theliquid crystals increase the switching speed, and cooling the liquid crystals improves phase stability.

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grayscale images to the SLM as compared to the amount of light in the 0th order when the SLM is replaced with a reference
mirror. This measurement quantifies losses in the coverglass coatings, losses due to wavelength dependent reflectivity of thepixel pads, as well as losses to diffraction from reflecting off the pixilated structure of the backplane. In the case of a dielectric
mirror coated model, the measurement accounts for losses due to imperfect reflectivity of this dielectric mirror coating. The
0th order diffraction efficiency will vary as a function of wavelength due to differences in coating materials and designs. It will
also vary with pixel value due to the inherent change in the index of refraction of the liquid crystal that results in a change inthe Fresnel reflections inside the liquid crystal cell. Most standard SLMs will range from 70 – 90%, while the dielectric mirror
coated models will range from 92 – 98%.

High Efficiency Dielectric Mirror Coating – Optically, the backplane is converted into a flat dielectric mirror bydepositing dielectric layers to eliminate the amplitude and optical path variations associated with the underlying aluminumpixel structure. The dielectric stack is kept thin to minimize any drop in electric field across the LC layer as shown in thefigure below.

Diffraction Efficiency (1st-order) – This is
the percentage of light measured in the 1st-orderwhen writing a linear repeating phase ramp to theSLM as compared to the light in the 0th order when
no pattern is written to the SLM. 1st-orderdiffraction efficiency varies as a function of thenumber of phase levels, or pixels, in the phaseramp. Example measurement data taken at various
wavelengths is shown below for phase ramps with2 to 8 phase levels between 0 and 2π.

Typical Measured 1st Order Diffraction Efficiency+1-303-833-4333 (T)+1-303-833-4335 (F)sales@meadowlark.com
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POLARIZERS • SPATIAL LIGHT MODULATORS • WAVEPLATES • LIQUID CRYSTAL DEVICES • OTHER CAPABILITIESDiffraction Efficiency (0th-order) – This is the amount of light retained in the 0th-order (dc) when writing solid

OTHER CAPABILITIES • LIQUID CRYSTAL DEVICES • WAVEPLATES • SPATIAL LIGHT MODULATORS • POLARIZERSSoftware - Meadowlark Optics’ SLMs are supplied with agraphical user interface and software development kits that
support LabVIEW, Matlab, Python, and C++. The software allows
the user to generate images, to correct aberrations, to calibrate
the global and/or regional optical response over ‘n’ waves ofmodulation, to sequence at a user defined frame rate, and tomonitor the SLM temperature.
Global or Regional Calibrations - Regional calibrations provide thehighest spatial phase fidelity commercially available by regionallycharacterizing the phase response to voltage and calibrating on a
pixel-by-pixel basis.
Image Generation Capabilities
Bessel Beams: Spiral Phase, Fork, Concentric Rings, Axicons
Lens Functions: Cylindrical, Spherical
Gratings: Blazed, Sinusoid
Diffraction Patterns: Stripes, Checkerboard, Solid, Random Phase
Holograms, Zernike Polynomials, Superimpose Images
Optional Look-Up-Table Calibration Kit (Part Number LUT1)
Meadowlark includes a calibrated LUT at one of our standard test sources (405, 532, 635, 785, 1064, or 1550 nm). If theuser wants to work at a different wavelength, we recommend purchasing our Look-Up-Table Calibration Kit. It provides
the tools needed to create a custom LUT based on the user’s wavelength and operating temperature for optimalperformance. The kit is shipped with software and a National Instruments NI-6000 data acquisition card. The user only
needs to provide a photodetector at their desired wavelength.

On chip temperature sensors
allow the user to monitor theSLM temperature either throughthe example program or thesoftware developer kits.

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and low latency image transfers. Triggering can be performed on SLM chip refresh period boundaries of 696 µs, or evenin the middle of refresh periods for applications requiring the SLM be tightly synchronized to external hardware. Thecontroller also includes 752 frames of internal memory that can be loaded in advance, then sequenced at full speed inorder to minimize traffic on the PCIe bus during operation. Using the 8-bit input/12-bit out design enables the SLM tosupport a broad wavelength range without sacrificing linear phase levels

ONE SLM supports a broad wavelength
range without losing linear phase levels

PCIe Controller supports high frame rates(up to 1436.1 Hz)

High Power Capability - Meadowlark SLMs are designed for compatibility with high power lasers through useof low absorption materials, large pixel pads, dielectric mirror options, and liquid cooling. If you are using a highpower laser please contact Meadowlark with more information about your average power, pulse width, repetition
rate, and beam diameter incident on the SLM. We will compare your laser specifications to our catalog of collectedmeasurements and make a recommendation for the power handling limit of your optical system.

Liquid Cooling System - A copper block is attached to the back of the optical head to draw heat out of the SLM chip.
The copper block is coupled via 2 meters of quick-disconnect tubing to cooling unit containing an external pump,radiator, and fan to cool the liquid down to ambient temperature. Includes one bottle of liquid coolant. The liquid
cooling system not only pulls heat away from the SLM, it also keeps the SLM at a consistent temperature to ensure nochange in modulation occurs as temperature varies.

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POLARIZERS • SPATIAL LIGHT MODULATORS • WAVEPLATES • LIQUID CRYSTAL DEVICES • OTHER CAPABILITIESHardware Interface - The 1024 x 1024 SLM system includes a Gen3 x8 PCIe controller with input and output triggers

Array Size: 17.40 x 17.40 mm
Pixel Pitch: 17 x 17 µm

Zero-Order Diffraction Efficiency: 75 - 87%
With Dielectric Mirror Coating: 92 – 98%

HIGH SPEED
Standard Calibration
Wavelengths

Liquid Crystal Response Time

CalibratedWavefront
Distortion

AR Coating Range
488 – 850 nm

AR Coating Range
500 – 1200 nm

AR Coating Range
850 – 1650 nm

532 nm

≤ 1.0 ms

≤ 1.4 ms

–λ/5635 nm≤ 1.3 ms

≤ 1.8 ms

–λ/6785 nm≤ 1.8 ms

≤ 2.4 ms–

λ/71064 nm–≤ 3.4 ms

≤ 5.5 ms

λ/101550 nm––≤ 8.0 ms

λ/12

ULTRA HIGH SPEED
Standard Calibration
Wavelengths

Liquid Crystal Response Time

Calibrated
Wavefront
Distortion

AR Coating Range
488 – 850 nm

AR Coating Range
500 – 1200 nm

AR Coating Range
850 – 1650 nm

532 nm

≤ 0.6 ms

≤ 0.7 ms

–λ/5635 nm≤ 0.7 ms

≤ 0.9 ms

–λ/6785 nm≤ 0.9 ms

≤ 1.2 ms

–λ/71064 nm–≤ 1.7 ms

≤ 2.0 ms

λ/101550 nm––≤ 3.9 ms

λ/12

HIGH SPEEDResolution: 1024 x 1024
Fill Factor: 97.2%

ULTRA HIGH SPEED

OTHER CAPABILITIES • LIQUID CRYSTAL DEVICES • WAVEPLATES • SPATIAL LIGHT MODULATORS • POLARIZERS

1024 x 1024 Analog Spatial Light Modulator Specifications

Model Number Guide:

Phase-only Optical Test Setups* Vertical buff available as a custom option.
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POLARIZERS • SPATIAL LIGHT MODULATORS • WAVEPLATES • LIQUID CRYSTAL DEVICES • OTHER CAPABILITIESPCIe Controller

Liquid Cooled
Optical HeadUHSP1K Optical Head

HSP1K Optical Head

1024 x 1024 Spatial Light Modulator Component Dimensions+1-303-833-4333 (T)+1-303-833-4335 (F)sales@meadowlark.com
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VM1 Tip/Tilt Stage
Siskiyou Tip/Tilt StageOTHER CAPABILITIES • LIQUID CRYSTAL DEVICES • WAVEPLATES • SPATIAL LIGHT MODULATORS • POLARIZERS

Tip/Tilt Stage Dimensions

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FAX:048-871-0068

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