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 pumper 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.
Qubig’s high-efficiency electro-optic modulator has a custom resonance frequency (f0) ranging from 0.1MHz up to < 100MHz and a 50 Ohm input with VSWR of less than 1:1.2. Other features include damped out piezo/acoustic resonances, low residual amplitude modulation (RAM), usable bandwidth ~ 1% of f0 (manual tuning available), and large aperture for easy alignment. The EOM offers 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)
- Any orientation for s- or p-polarization
- Max. RF power: 2W (10W with thermal mount)
- Large aperture for easy alignment
- Standard post mounting (M4 or #8-32)
- Dedicated 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
High Efficiency Electro Optic Modulator from Qubig
Custom resonance frequency from 0.1MHz to < 100MHz
Low residual amplitude modulation (RAM)
Large aperture for easy alignment
Any orientation for s- or p-polarization
Dedicated versions available for low, medium and high laser power/intensity