Posted in | Ion Lasers

Qubig High Efficiency Electro Optic Modulator

Electro-optic modulators (EOMs) are an easy to use and efficient tool to externally modify the phase, frequency, polarization, or amplitude of a free-space laser.

In contrast to acousto-optic modulators, the spatial mode of the laser beam remains unaltered. So EOMs are an ideal choice when several frequency components are required in the laser spectrum. For instance in repumper frequency generation in laser cooling and quantum optics, spectral broadening to minimize stimulated Brillouin scattering (SBS) in high power fibers, and for frequency modulation (FM) techniques, like FM Spectroscopy, Modulation Transfer Spectroscopy or Pound-Drever Hall (PDH) Laser Frequency Stabilization. The modulation spectrum of Qubig’s electro-optic modulators ranges from DC-coupled phase shifters to high-Q, resonant EOMs in the MHz to GHz.

High-efficiency electro-optic modulator supplied by Qubig has a custom resonance frequency (f0) from 0.1MHz to < 100MHz and 50 Ohm input with VSWR of less than 1:1.2. Other features include usable bandwidth ~ 1% of f0 (manual tuning available), damped out piezo/acoustic resonances, low residual amplitude modulation (RAM), and large aperture for easy alignment. The EOM has efficient modulation and is optimized for free-space lasers. It is available with a number of options such as temperature control, fiber coupling, wedged facets, Brewster angles, amplitude modulator and polarization modulator.

Key Features

The main features of the high-efficiency electro-optic modulator are:

  • Usable bandwidth ~ 1% of f0 (manual tuning available)
  • Custom resonance frequency from 0.1MHz to < 100MHz
  • 50 Ohm input, VSWR < 1:1.2
  • Damped out piezo/acoustic resonances
  • Low residual amplitude modulation (RAM)
  • Large aperture for easy alignment
  • Any orientation for s- or p-polarization
  • Max. RF power: 2W (10W with thermal mount)
  • Standard post mounting (M4 or #8-32)
  • Different versions available for low, medium and high laser power/intensity

Applications

The applications of the high-efficiency electro-optic modulator are:

  • Modulation Transfer Spectroscopy
  • Frequency Modulation Spectroscopy
  • Laser frequency stabilization
  • Pound-Drever Hall locking
  • Dynamic optical lattices
  • Spectral broadening to increase MOT capture velocity

Qubig High Efficiency Electro Optic Modulator

Usable bandwidth ~ 1% of f0 (manual tuning available)
Custom resonance frequency from 0.1MHz to < 100MHz
50 Ohm input, VSWR < 1:1.2
Damped out piezo/acoustic resonances
Different versions available for low, medium and high laser power/intensity

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