APEs external Electro-optic Modulator (EOM) is a dedicated modulator for Stimulated Raman Scattering (SRS) and other applications that require an amplitude modulated signal.
APEs external Electro-optic Modulator (EOM) is a dedicated modulator for Stimulated Raman Scattering (SRS) and other applications that require an amplitude modulated signal.
The external EOM can be used with most CW or mode-locked lasers, or synchronously pumped OPOs in the VIS to NIR range (as for example the Levante Emerald or the 1031 nm output of the Emerald Engine). It modulates the amplitude of the beam with a fixed frequency of either 10 MHz or 20 MHz. Modulators for different wavelengths between 420 nm and 1600 nm are available as well.
The EOM combines an electro-optical crystal with a polarizer in a single housing and can be easily mounted onto the optical table. The modulator is connected to the computer through a USB interface and power and phase can be easily remote controlled through the Windows-based Control Software. For easy synchronization the modulator can be connected to the pump laser sync output (typically a signal from a fast photo diode). Alternatively, the frequency can be generated internally.
| EOM | 420 | 690 | 900 | 1030 | 1200 |
|---|---|---|---|---|---|
| Wavelength Ranges | 420 … 600 nm | 690 … 900 nm | 900 … 1200 nm | 1030 … 1064 nm | 1200 … 1600 nm |
| Modulator frequency | Either 10 MHz or 20 MHz fixed modulation frequency. (Must be specified at time of order. Frequency can be phase locked to laser frequency: f/4 or f/8) |
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| Laser frequency | 76 … 84 MHz (± 0.5 MHz) | ||||
| Damage threshold modulator | 2 W/mm² at 532 nm 4 W/mm² at 1064 nm |
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| Modulation depth | > 85 % (after initial warm up) | ||||
SRS microscopy
Amplitude Modulation of laser pulses
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Photonic Solutions Ltd
Unit 2.2 Quantum Court
Heriot-Watt University Research Park
Edinburgh
EH14 4AP
