Features

• 7 Models Cover the 150 nm to 2.6 μm Wavelength Range
• High-Speed Response (Please see the Specs Tab for Details)
• Easy-To-Use, Compact, and Versatile
• Internal Bias Battery A23 (Included)
• Thin Profile Allows Measurements in Tight Spaces
• Includes Threaded Mount for Ø1" (Ø25 mm)
• Accepts Ø1" Diameter Optics via SM1Threads
• New Large Area and IR Versions Available

Thorlabs' newly redesigned biased photodetectors are now available in seven models that cover the wavelength range from the UV to the mid-IR (150 nm to 2.6 µm) with improved bandwidth and NEP performance. The slim housing allows the optical detector to slip in between tight setups. Each model comes complete with a fast PIN photodiode and an internal bias battery packaged in a rugged aluminum housing. With a wide bandwidth DC-coupled output, these detectors are ideal for monitoring fastpulsed lasers as well as DC optical sources. Each DET has a Bias-T circuit that combines a high frequency AC signal with a DC signal into a single output. The direct photodiode anode current is provided on a side panel BNC. This output is easily converted to a positive voltage using a terminating resistor. When looking at high-speed signals, Thorlabs recommends using a 50Ω load resistance; for lower bandwidth applications, our variable terminator is a great time saver.

All connections and controls have been moved away from the light path, thus making the DET a more useful, easier-to-use device. The SM1 threading, SM05 threading, and #8-32 (M4) threaded stubs on the DET detector housing allow it to be mounted in a cage system, lens tube system, or on a TR series post. See the mounting options tab for more details on how to incorporate a DET series photodetector into an optical setup.