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High-Speed Optical Modulators![]()
OM6N High-Speed Optical Modulator Two-channel 2P image of mouse kidney cells acquired wtih Thorlabs' Bergamo® II Microscope and Tiberius® Fast-Tuning Ti:Sappire laser, using the OM6N High-Speed Optical Modulator to Define a Region of Interest ![]() Please Wait ![]() Click to Enlarge The high-speed temporal response of the OM6N(/M) and OM6NH(/M) Optical Modulators, which enables fast on/off modulation, is exhibited. ![]() Click to Enlarge High-Speed Optical Modulator shown with the PDA100A2 Photodector removed, thereby providing access to four 4-40 taps for 30 mm cage system compatibility. ![]() Click to Enlarge Typical transmissions for the OM6N (solid) and OM6NH (dashed) modulators at 700 nm (blue) and 1100 nm (red). For each unit, the full transmission (at 0 V) is different for 700 nm compared to 1100 nm due to the reflective nature of the gold-coated mirrors. Additional performance graphs are available on the Graphs tab. Features
Thorlabs' High-Speed Optical Modulators use deformable mirror technology instead of Pockels cells or acousto-optic modulators to provide high-speed intensity modulation and beam attenuation (see graph at right). The all-reflective design incorporates gold-coated MEMS mirrors that are polarization independent and introduce minimal (<100 fs2) dispersion. This unidirectional device accepts a collimated, 1 to 2 mm (1/e2) diameter input beam with <5 W optical power and is available with either standard (>250:1) or high (>2500:1) contrast ratios. Transmission, which is a function of both input voltage and wavelength as shown in the graph to the right, is controlled by a 0 to 1 V analog input voltage; this voltage can be easily generated by off-the-shelf data acquisition (DAQ) hardware or other electronics. The device supports continuous DC operation as well as modulation frequencies up to 20 kHz, making it ideal for imaging applications such as fly-back blanking or region of interest (ROI) selection. The higher contrast achieved with the OM6NH(/M) modulator is made possible by incoporating two MEMS mirrors, the deformation of which behaves like a grating, into the design; one diffracts horizontally and the other vertically to provide enhanced contrast performance. Replaceable Photodetector Housing and Mounting Features Three slots in the enclosure allow the modulator to be mounted directly to an optical table with table clamps, such as our CL6 clamps (not included), resulting in a minimum beam height of 1.25". The base also includes three 8-32 (M4) mounting holes for attaching pedestal posts, which can be used to elevate the modulator to the desired beam height. The unit is shipped with a 24 V power supply with an KPJX-4S-S connector for the modulator, as well as a ±12 V supply for the photodetector. For more information, please see the Pin Diagrams tab. ![]() Click to Enlarge Laser Power Modulator Housing Dimensions
Performance GraphsThis data reflects the typical performance of our high-speed optical modulators and is presented for reference only. The guaranteed specifications are shown in the Specs tab. ![]() Click to Enlarge Typical transmission for the OM6N and OM6NH at 700 nm. The transmission will vary from device to device. For each unit, the extinction voltage is the input voltage resulting in minimum transmission. Please note that the maximum contrast ratio, defined as maximum transmission to minimum transmission, can only be achieved when the extinction voltage is carefully calibrated. ![]() Click to Enlarge Typical transmission for the OM6N and OM6NH at 1100 nm. The transmission will vary from device to device. For each unit, the extinction voltage is the input voltage resulting in minimum transmission. Please note that the maximum contrast ratio, defined as maximum transmission to minimum transmission, can only be achieved when the extinction voltage is carefully calibrated. ![]() Click to Enlarge Typical extinction voltages as a function of input wavelength. The exact voltage for maximum extinction varies from device to device. ![]() Click to Enlarge Plot showing the high frequency temporal response of the OM6N(/M) and OM6NH(/M) Optical Modulators.
![]() Click to Enlarge High-Speed Optical Modulator Electrical Connections OM6N(/M) and OM6NH(/M) Optical Modulator ConnectionsBNC Female, Modulation Signal InputModulation Signal Input is 0 - 1 V KPJX-4S-S Connector, Female Power INPDA100A2 Detector ConnectionsBNC Female Output (Photodetector)PDA100A2 has a 0 - 10 V Output Male (Power Cable)*![]() *For the Included LDS12B Power Supply Female Power IN (Photodetector)
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