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LCOS-SLM characteristics
Light resistance
When an LCOS-SLM is irradiated with a high-power laser, physical damage or irreversible characteristic changes may occur. To see if such damage or irreversible characteristic changes will occur, laser irradiation tests are performed and the test results are then examined. Physical damage includes damage to the transparent electrode, dielectric multilayer film and aluminum mirror, and also thermal damage caused by boiling of the liquid crystal materials. Irreversible characteristic changes may occur in the materials making up of the LCOS-SLM due to two-photon absorption when irradiated by an ultra-short pulsed laser or due to irradiation with an ultraviolet laser (400 nm or shorter wavelengths). Also, reversible changes in characteristics may result from the liquid crystal temperature characteristics accompanying a temperature rise caused by the light absorption in the LCOS-SLM. After the irradiation tests, the outer appearance of the damage is checked and the output image and phase modulation are evaluated. If an abnormal condition is found when no voltage is applied to the LCOS-SLM, it is determined as physical damage. If an abnormal condition is found when voltage is applied, it is determined as an irreversible characteristic change.
The tables below show data examples obtained after the light resistance test. The light resistance depends on the averaged power of light (entire incident light) entering the LCOS-SLM and the peak power (light power density) incident per unit area. If the X15213-05 LCOS-SLM is used in the UV region at 400 nm or shorter wavelengths, it may sustain damage. Please consult us when using it with UV light at 400 nm or shorter wavelengths.
X15213-02
Light source |
Beam diameter |
Irradiation |
Irradiation light intensity |
Peak power |
Results |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Type |
Wavelength |
Pulse |
Repetition |
Average |
Output power |
Peak |
Output |
Damage |
|
||
Ti:S laser |
800 |
50 fs |
1 |
φ9 |
3 hours |
2.7 |
4.3 |
108 GW |
170 GW/cm2 |
None |
Seen |
Ti:S laser |
800 |
50 fs |
1 |
φ11 |
10 hours |
2.7 |
2.9 |
108 GW |
114 GW/cm2 |
None |
None |
Ti:S laser |
800 |
30 fs |
0.01 |
φ18 |
6 hours |
0.05 |
0.02 |
333 GW |
131 GW/cm2 |
None |
None |
X15213-03B
Light source |
Beam diameter |
Irradiation |
Irradiation light intensity |
Peak power |
Results |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Type |
Wavelength |
Pulse |
Repetition |
Average |
Output power |
Peak |
Output |
Damage |
Characteristic change |
||
YAG laser |
1064 |
- |
- |
φ2.5 |
1 hour |
2.0 |
40.7 |
- |
- |
None |
None |
YAG laser |
1064 |
200 ns | 80 |
φ2.5 |
1 hour |
2.0 |
40.7 |
0.25 KW |
5.1 KW/cm2 |
None |
None |
Pulsed |
1030 |
670 fs |
1 |
φ4.5 |
10 hours | 0.6 |
3.8 |
1.8 GW |
11.3 GW/cm2 |
None |
None |
Pulsed |
1030 |
1.37 ps |
30 |
φ8.11 |
8 hours |
5.2 |
10.1 |
0.25 GW |
0.49 GW/cm2 |
None |
None |
Pulsed |
1030 |
11.4 ns |
10 |
φ13 |
8 hours |
17.4 |
13.1 |
0.31 GW |
0.23 MW/cm2 |
None |
None |
X15213-03CL/-03CR
Light source |
Beam diameter |
Irradiation |
Irradiation light intensity |
Peak power |
Results |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Type |
Wavelength |
Pulse |
Repetition |
Average |
Output power |
Peak |
Output |
Damage |
Characteristic change |
||
Fiber |
1070 |
- |
- |
φ5.5 |
10 hours |
743 |
3127 |
- |
- |
None |
None*1 |
*1 Depends on water-cooling conditions. Please contact us for details.
X15213-13
Light source |
Beam diameter |
Irradiation |
Irradiation light intensity |
Peak power |
Results |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Type |
Wavelength |
Pulse |
Repetition |
Average |
Output power |
Peak |
Output |
Damage |
Characteristic change |
||
CW |
532 |
- |
- |
φ8.45 |
8 hours |
10 |
17.8 |
- |
- |
None |
None |
X15213-16
Light source |
Beam diameter |
Irradiation |
Irradiation light intensity |
Peak power |
Results |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Type |
Wavelength |
Pulse |
Repetition |
Average |
Output power |
Peak |
Output |
Damage |
Characteristic change |
||
Pulsed |
515 |
4 ps |
25 |
φ3.7 |
27 hours |
0.162 |
1.5 |
1.6 MW |
30 MW/cm2 |
None |
None |
60 hours |
0.36 |
3.3 |
3.6 MW |
67 MW/cm2 |
Seen |
Seen |
|||||
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