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Electro-Optic Modulator
- Easy to configure
- Reliable
- Easy for integration
- Compact size
PRODUCT DESCRIPTION
E-O modulators and modulation systems are used for pulse selection, regen-switching, video disk mastering and data recording. Products include E-O phase modulators, beam deflectors, associated drivers, transverse field modulators, laser noise-reduction systems, and optical isolators. We also manufacture, on a custom basis, intensity modulation systems with high frequency capabilities beyond 400MHz.
Most modulators are transverse field type Pockels Cells. In the original Pockels Cell design the optical beam is longitudinal to the electric field. In the new transverse design the optical beam is orthogonal to the electric field. The advantage of the transverse design is that it requires approximately 100 volts as opposed to the kilovolts required by the original design.
• 2 or 4 crystal configurations
• Designed to minimize the natural net birefringence
• Require DC offset voltage to set the quiescent operating point
• Supplied with an output polarizer, pre-aligned to the crystal axes
• Require either that the input laser is polarized or use of an auxiliary polarizer at the input
• Filled with index matching fluid
Features:
12
Note: Window assemblies should not be removed
Configurations:
ADP Crystal Series Wavelength Limits (240 to 800 nm)*
Model Number |
V ½ wave @ 500nm |
V ½ wave @ 830nm |
Aperture Diameter |
Resonances |
Contrast Ratio @ 633nm |
Length w/ Polarizer |
STM370 |
184 |
306 |
2.5mm |
No |
500:1 |
158mm |
STM370 LA |
263 |
437 |
3.5mm |
No |
500:1 |
158mm |
STM380 |
92 |
153 |
2.5mm |
No |
500:1 |
253mm |
STM390 |
115 |
190 |
3.5mm |
No |
500:1 |
272mm |
KD*P Crystal Series Wavelength Limits (240 to 1100nm)*
Model Number |
V ½ wave @ 500nm |
V ½ wave @ 830nm |
V ½ wave @ 1064nm |
Aperture Diameter |
Resonances |
Contrast Ratio @ 633nm &1064nm |
Length w/ Polarizer |
STM350-50 |
455 |
757 |
970 |
3.1mm |
Yes |
500:1,700:1 |
106mm |
STM350-80 |
261 |
433 |
522 |
2.7mm |
Yes |
500:1,700:1 |
137mm |
STM350-80LA |
360 |
600 |
720 |
3.5mm |
Yes |
500:1,700:1 |
137mm |
STM350-105 |
226 |
376 |
472 |
3.1mm |
Yes |
500:1,700:1 |
162mm |
STM350-160 |
130 |
216 |
275 |
2.7mm |
yes |
300:1,500:1 |
215mm |
STM350-210 |
113 |
188 |
240 |
3.1mm |
Yes |
300:1,500:1 |
268mm |
LTA Crystal Series Wavelength Limits (700 to 2000nm)
Model Number |
V ½ wave @ 830nm |
V ½ wave @ 1064nm |
V ½ wave @ 2500nm |
Aperture Diameter |
Resonances |
Contrast Ratio @ 1064nm |
Length w/ Polarizer |
STM360-40 |
213 |
400 |
950 |
2.7mm |
Yes |
200:1 |
95mm |
STM360-80 |
143 |
183 |
430 |
2.7mm |
Yes |
100:1 |
137mm |
STM360-120 |
107 |
138 |
323 |
2.7mm |
Yes |
100:1 |
174mm |
STM360-160 |
71 |
92 |
215 |
2.7mm |
Yes |
100:1 |
215mm |
Amplifier Details
Model |
Bandwidth |
Rise/Fall Times |
Max. Output V |
Typical Drive Configuration |
Output |
ST25A |
DC-to-25MHz |
14ns |
145 |
100 Ohms B.L. |
Linear |
ST25D |
DC-to-30MHz |
8ns |
175 |
100 Ohms B.L. |
Digital |
ST50 |
DC-to-50MHz |
7ns |
90 |
50 Ohms B.L. |
Linear |
ST100 |
DC-to-100MHz |
3.5ns |
90 |
50 Ohms B.L. |
Linear |
ST200 |
10Khz-to-200MHz |
2ns |
170 |
50 Ohms S.E. |
-- |
ST275 |
DC-to-8MHz |
50ns |
275 |
Lumped Capacitance |
Linear |
ST302RM |
DC-to-250KHz |
1 micro-sec |
750 |
Lumped Capacitance |
Linear |
ST302A |
DC-to-1MHz |
350ns |
350 |
Lumped Capacitance |
Linear |
ST307 |
DC-to-50KHz |
8ns |
800 |
Lumped Capacitance |
Digital |
ST505 |
5MHz-to-100MHz |
3.5ns |
44 |
50 Ohms S.E. |
-- |
ST550 |
20MHz-to-500MHz |
1.5ns |
140 |
50 Ohms S.E. |
-- |