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LCOS-SLM characteristics
Time response characteristics
Definition
In time response characteristics for a transition (10 % to 90 %) in the 2π phase difference, the transition time when the pixel value is changed from a larger value to a smaller value is defined as the rise time, and the transition time when the pixel value is changed from a smaller value to a larger value is defined as the fall time. Since the pixel values are made corresponding to 8-bit gray levels, the controller is set so that the voltage value is maximum when the pixel value is 0 (zero) and decreases as the pixel value increases.
Measurement method
Using a cross-nicol optical system（ see “Phase modulation characteristics” ）where the phase modulation can be observed as intensity modulation, changes in the output light intensity are measured with a photodiode and an oscilloscope. Specifically, the output light intensity change is measured by switching between phase 0 and 2π, and the light intensity change is then converted to a phase change to calculate the rise and fall times required for a transition from 10 % to 90 %. As one example, the time response characteristics of the X15213-03B LCOS-SLM are shown in the graphs below.
Measurement setup for phase modulation characteristics (cross-nicol optical system)
Time response characteristics (X15213-03B, typical example)
Measurement results
The average rise and fall times for each of our LCOS-SLM types are shown below. The rise time tends to be faster than the fall time.
Evaluation results of response time (average values)
Type No. |
Wide wavelength band type |
Specific wavelength type |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
-01 |
-07 |
-08 |
-02 |
-03B |
-05 |
-12 |
-13 |
-15 |
-16 |
-19 |
|
Wavelength of light source (nm) |
633 |
1064 |
1550 |
785 |
1064 |
405 |
940 |
532 |
1550 |
532 |
1950 |
Rise time (ms) |
5 |
9 |
13 |
33 |
27 |
7 |
38 |
10 |
26 |
11 |
30 |
Fall time (ms) |
21 |
73 |
145 |
85 |
83 |
17 |
109 |
21 |
135 |
33 |
155 |
Type No. |
High-power laser type |
Laser metal processing type |
|||||
|---|---|---|---|---|---|---|---|
-02L/-02R |
-03BL/-03BR |
-12L/-12R |
-15L/-15R |
-16L/-16R |
-19L/-19R |
-03CL/-03CR |
|
Wavelength of light source (nm) |
785 |
1064 |
940 |
1550 |
532 |
1950 |
1064 |
Rise time (ms) |
33 |
27 |
38 |
26 |
11 |
30 |
27 |
Fall time (ms) |
85 |
83 |
109 |
135 |
33 |
155 |
83 |
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