M500 High Voltage Video Amplifier
Linear amplifier for 500V and >5MHz operation
Our M250 amplifier (for now) retains the title of our highest bandwidth linear amplifier design but its maximum output voltage swing is rather limited and it is most suitable for our EM200 2mm aperture modulators in the UV-visible wavelength range. Larger apertures or longer wavelengths would exceed the maximum voltage swing if half wave modulation is required. Enter our M500 amplifier.
The M500 amplifier has a bandwidth of >6MHz and a rise/fall time of less than 70ns giving it almost identical temporal performance to the M250 but with the advantage of a peak to peak differential output voltage swing of >500V, comfortably enough to drive an EM400A/K series modulator even into the near IR limits of the materials.
Like the M250 design, this amplifier does not include an internal oscillator so an external variable output low signal level source must be connected. The designs retain the DC biasing control of the M250 and so is ideally suited to driving larger aperture versions of our low-voltage series modulators such as the EM400A/K and at shorter wavelengths even EM600A/K transverse field modulators which require DC bias to set the optimum operating point for the most linear modulation. The higher voltage M1000 and M2500 units are more suitable for driving other transverse field modulators such as RTP Pockels cells and even some lower voltage BBO cells for analogue modulation applications such as true polarization rotation (when combined with a suitable waveplate)
Specifications
| Parameter | M500 |
| Output Voltage Swing | >500V (differential) |
| Full amplitude Frequency Response (sinewave) | ~5MHz |
| Small Signal Frequency Response (20% Full Amplitude) |
~10MHz |
| Rise and Fall Time | <70ns |
| Input Voltage | -2.5V to + 2.5V |
| Input Impedance | 50 ohm |
| Cabinet Form | 63HP width x 3U height rack |
| Cabinet Size (mm) | 160 (height) x 360 (width)x310 (depth) |
| Mains Voltage | 90 - 264Vac 50/60Hz |
Applications
The combination of high bandwidth with substantially higher voltage swing these amplifiers offer compared to the older M250 design has opened up entirely new possibilities for modulation systems. These may now include the larger aperture EM400 and EM600 devices as well as other transverse field modulators such as our lowest voltage RTP options and this is enabling a whole new range of opportunities for higher optical power analogue modulation in areas such as two-photon microscopy and arbitrary polarization generation at high speeds.
