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Biased DetectorsThorlabs offers a selection of free-space and fiber-coupled biased detectors. Our Ultrafast detector is optimized for time domain applications and has a bandwidth of 20 GHz, and our high-speed detectors have bandwidths up to 5 GHz. Our high-speed and free-space detectors can be used in conjunction with our photodiode amplifier, and our spectral response flattening filters improve the response uniformity of silicon detectors. Adapters can be used to couple a fiber to a free-space detector.