Double-Pass AOM Clusters are versatile opto-mechanical units that enable dynamic frequency control and amplitude modulation of laser light with high bandwidth. These setups can be combined with beam splitters, monitor diodes, shutters and other multicube™ components.
Optical SetupThe input port is fiber-coupled to a PM fiber cable. A photo diode right after the input port allows for continuous monitoring of the input laser power. The AOM diffracts the incident light and induces a frequency shift. Magnitude of the frequency shift and diffraction efficiency are determined by the applied radiofrequency signal. The system uses a double-pass AOM set up in a 'cat's-eye' configuration. In this configuration, the diffracted light is focused onto a retroreflective mirror, propagates back through the set up collinearly and is diffracted again by the acousto-optic modulator. On its way, the light passes through a quarter-wave plate twice. Due to its resulting perpendicular polarization, the light is subsequently reflected by a PBS. The reflected light has undergone a frequency shift of twice the applied radiofrequency. A second power monitor is used before coupling into the output fiber cable.
Acousto-optic Modulators
The acousto-optic modulators form the centerpiece of all Integrated AOM Systems. As modulators we integrate purchased AOMs (e.g. MT-Series from AA Optoelectronics, AOMO-Series from Gooch & Housego as well as corresponding modulators from other manufacturers with a similar form factor). The achievable tunability of the output laser frequency as well as the efficiency of the system is determined by the diffraction efficiency of the AOM.
Fiber CouplersA fundamental component of a Double-Pass AOM Cluster is the
Laser Beam Coupler, which is the input into the opto-mechanical unit collimating the input radiation and, finally, couples the radiation back into the polarization-maintaining fiber cables. The stability of the Single-Pass AOM Cluster is determined by the
stability of the laser beam coupler.
How to Order
Please provide us with
Wavelength
Maximum input laser power
Center Frequency and tuning range (AOM)
Cable lengths
Connector types
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