InGaAs Fiber-Coupled Amplified Photodetectors
- Wavelength Range from 950 - 1650 nm
- Fixed or Switchable Gain Versions
- Bandwidths Up to 1500 MHz
- High Signal-to-Noise Ratio
600 MHz Max Bandwidth
1500 MHz Max Bandwidth
|FPD510-FC-NIR & FPD610-FC-NIR|
- Built-in Amplifier
- Fiber-Coupled Module with M4 Tapped Hole for Post Mounting
- Minimum Recommended Load Resistor: 50 Ω
- Power Supply Included
We offer a selection of Indium Gallium Arsenide (InGaAs) Fiber-Coupled Amplified Photodetectors that are sensitive to light in the NIR wavelength range. These fast response detectors are ideal for detection of fast laser pulses, low-light level signals, or chopped light sources. All detectors include a power supply.
Menlo Systems' high-sensitivity, ultrafast PIN FPD310-FC-NIR photodetector is optimized for high gain, high bandwidths, extremely short rise times and high signal-to-noise ratio. The photodetector is an easy-to-use, InGaAs PIN photodiode with an integrated high-gain, low-noise, RF amplifier. The gain can be switched between two fixed settings, which allows optimal performance for many applications. The compact design of this detector allows for easy OEM integration. A low noise power supply with a universal AC input is included. This detector has an SMF28 Pigtail with an FC/APC optical input.
FPD510-FC-NIR & FPD610-FC-NIR
Menlo Systems' high-sensitivity, ultrafast PIN FPD510-FC-NIR and FPD610-FC-NIR photodetectors are optimized for maximum signal-to-noise-ratio for detection of low-level optical beat signals and pulse shapes at frequencies up to 250 MHz and 600 MHz, respectively. These photodetectors are easy-to-use, InGaAs PIN photodiodes with an integrated high-gain, low-noise transimpedance amplifier. The 3 dB bandwidth of these DC-coupled devices is 200 MHz for FPD510-FC-NIR and 500 MHz for FPD610-FC-NIR. The compact design of the detectors allows for easy OEM integration. A low noise power supply with a universal AC input is included with each. The detectors have an SMF28 Pigtail with an FC/APC optical input.
For InGaAs photodetectors with free-space input, click here.
FPD Series Detectors
Signal Out- SMA Female (Photodetector)
For connection to a suitable monitoring device, e.g. oscilloscope or RF-spectrum-analyzer, with 50 Ω impedance.
Female (Power Cables)
Male Power IN (Photodetector)
Pulsed Laser Emission: Power and Energy Calculations
Determining whether emission from a pulsed laser is compatible with a device or application can require referencing parameters that are not supplied by the laser's manufacturer. When this is the case, the necessary parameters can typically be calculated from the available information. Calculating peak pulse power, average power, pulse energy, and related parameters can be necessary to achieve desired outcomes including:
- Protecting biological samples from harm.
- Measuring the pulsed laser emission without damaging photodetectors and other sensors.
- Exciting fluorescence and non-linear effects in materials.
Pulsed laser radiation parameters are illustrated in Figure 1 and described in the table. For quick reference, a list of equations are provided below. The document available for download provides this information, as well as an introduction to pulsed laser emission, an overview of relationships among the different parameters, and guidance for applying the calculations.
Peak power and average power calculated from each other:
|Peak power calculated from average power and duty cycle*:|
|*Duty cycle () is the fraction of time during which there is laser pulse emission.|
Click to Enlarge
Figure 1: Parameters used to describe pulsed laser emission are indicated in the plot (above) and described in the table (below). Pulse energy (E) is the shaded area under the pulse curve. Pulse energy is, equivalently, the area of the diagonally hashed region.
|Pulse Energy||E||Joules [J]||A measure of one pulse's total emission, which is the only light emitted by the laser over the entire period. The pulse energy equals the shaded area, which is equivalent to the area covered by diagonal hash marks.|
|Period||Δt||Seconds [s]||The amount of time between the start of one pulse and the start of the next.|
|Average Power||Pavg||Watts [W]||The height on the optical power axis, if the energy emitted by the pulse were uniformly spread over the entire period.|
|Instantaneous Power||P||Watts [W]||The optical power at a single, specific point in time.|
|Peak Power||Ppeak||Watts [W]||The maximum instantaneous optical power output by the laser.|
|Pulse Width||Seconds [s]||A measure of the time between the beginning and end of the pulse, typically based on the full width half maximum (FWHM) of the pulse shape. Also called pulse duration.|
|Repetition Rate||frep||Hertz [Hz]||The frequency with which pulses are emitted. Equal to the reciprocal of the period.|
Is it safe to use a detector with a specified maximum peak optical input power of 75 mW to measure the following pulsed laser emission?
- Average Power: 1 mW
- Repetition Rate: 85 MHz
- Pulse Width: 10 fs
The energy per pulse:
seems low, but the peak pulse power is:
It is not safe to use the detector to measure this pulsed laser emission, since the peak power of the pulses is >5 orders of magnitude higher than the detector's maximum peak optical input power.