High Speed Biased Photodetectors BIM-7801-02

Overview

The BIM-7801-02 is a high-speed biased photodetector built around an integrated Si PIN photodiode. It covers 380-1100 nm with a 1.5 GHz bandwidth and a rise / fall time of <270 ps/<270 ps, converting optical power into photocurrent through the photovoltaic effect. An internal long-life lithium bias supply is built in, so the detector needs no external bias: connect a coaxial cable from the BNC output to a 50 Ω termination at an oscilloscope or spectrum analyser and the unit is ready to measure laser pulse width and temporal response.

Applications

• Q-switched laser output monitoring
• Mode-locked laser output monitoring
• Externally modulated CW laser output monitoring
• Time-domain and frequency-domain response measurement

Construction & Performance

The 35 × 35 × 55 mm housing carries a 0.2 mm effective detection diameter with a 45° acceptance angle and 1 pA dark current; response sensitivity is 0.4A/W@700 nm. Mounting is M4/8-32 and the unit weighs 110 g, powered by a built-in 9 v battery. Key specifications for this model:

• Model: BIM-7801-02
• Detector Material: Si
• Wavelength Range: 380-1100 nm
• Response Sensitivity: 0.4A/W@700 nm
• Rise / Fall Time: <270 ps/<270 ps
• Effective Detection Diameter: 0.2 mm
• Dark Current: 1 pA
• Acceptance Angle: 45°
• Band Width: 1.5 GHz
• Noise Equivalent Power: 0.002 pW/√Hz
• Noise Equivalent Power (2): ≥10 mW
• Optical Signal Input Interface: Free-space input - 02
• Electrical Signal Output Interface: BNC
• Mounting: M4/8-32
• Power supply: Built-in 9 V battery
• Dimensions: 35 × 35 × 55 mm
• Weight: 110 g

Storage & Handling

Keep the input window clean and free of dust and fingerprints; when cleaning is required, use optical-grade solvents and lens tissue. Always terminate the output into 50 Ω when measuring fast pulses, and avoid exceeding the specified maximum optical input. Remove the bias battery if the detector will be stored for an extended period, and keep the unit in a clean, dry environment away from direct sunlight and condensation.