FEMTO Messtechnik

FEMTO's low-noise balanced photoreceivers of the HBPR series enable the differential measurement of optical signals with wavelengths from 320 nm to 1700 nm and bandwidths up to 500 MHz. The optical inputs are optionally free space or fiber-coupled and Si or InGaAs. The HBPR series is characterized by a very low input noise (NEP) down to 3.7 pW/√Hz and a high common mode rejection (CMRR) of up to 55 dB. The output coupling is switchable (AC/DC), the gain can be set in two stages and the bandwidth can be limited to 20 MHz. Two monitor outputs with 10 MHz bandwidth enable fast, separate acquisition of the individual input signals. HBPR photoreceivers are ideally suited for highly sensitive and precise acquisition of laser pulses, even with high repetition rates and rapidly changing signal shapes. Customized versions are available upon request.

FEMTO offers a wide range of very low-noise infrared photodetectors. They offer bandwidths up to 2 GHz and gains up to approximately 10¹¹ V/W, resulting in measurement ranges from sub-pW to mW. The NEP reaches a minimum of 7.5 fW/√Hz using InGaAs photodiodes covering a wavelength range up to 1700 nm, with either a free space or fiber input (FC/PC, FC/APC). Many types and models are switchable in gain and bandwidth and can be controlled manually or remotely via PC. Customized models are available upon request.

FEMTO offers a wide range of very low-noise photodetectors. They offer bandwidths up to 2 GHz and gains up to approximately 10¹² V/W, resulting in measurement ranges from fW to mW. The NEP reaches a minimum of 0.7 fW/√Hz. There is a choice of Si or InGaAs photodiodes covering a wavelength range from 190 nm to 1700 nm, with either a free space or fiber input (FC/PC, FC/APC). Many types and models are switchable in gain and bandwidth and can be controlled manually or remotely via PC. Customized models are available upon request.

FEMTO photodiode amplifiers are a perfect choice for applications that require the conversion of small photocurrents into usable voltages. Depending on the type and model selected, our amplifiers offer many features including gain from 10² to 10¹³ V/A, switchable AC/DC-coupling, adjustable offset for baseline correction, adjustable bias/reverse voltage and switchable low pass filters. Some types and models even offer switchable gain and the capability of both manual and remote control. Customized models are available upon request.

FENTO's OE-200-UV variable gain UV photodetector is designed for a great variety of applications requiring the fast and precise measurement of small optical signal. By combining a low noise transimpedance amplifier with a Si-PIN photodiode a broad wavelength range from 190 nm up to 1000 nm is covered. The integrated amplifier offers adjustable gain from 10³ to 10¹¹ V/W and allows the measurement over a wide dynamic range from about 100 fW up to 2 mW. The noise equivalent power (NEP) reaches a minimum of 17 fW/√Hz. Additional features like switchable signal filters, adjustable offset and the capability of manual and opto-isolated remote control by a PC make the OE-200-UV one of the most versatile UV photodetectors.