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UPD Series Ultrafast Photodetectors

Updated:2025-03-13

Brand: ALPHALAS
Model: UPD
Description: The UPD series of ultrafast photodetectors are best suited for measurement of optical waveforms from DC to 25 GHz. Various models feature rise times as short as 15 ps and cover the spectral range from
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Product Details

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UPD Series Ultrafast Photodetectors Description：

Ultrafast Photodetectors: UPD Series Datasheet

ALPHALAS Ultrafast Photodetectors - Product Citations

ALPHALAS UPD Photodiode BNC - 2D Drawing

ALPHALAS UPD Photodiode BNC - 3D Model

ALPHALAS UPD Photodiode SMA - 2D Drawing

ALPHALAS UPD Photodiode SMA - 3D Model

Features

Ultra High-Speed Operation

Rise Times: starting from 15 ps

Bandwidths: up to 25 GHz

Spectral Ranges: 170 - 2600 nm (UV to IR)

Compact Design

Battery or External Power Supply

Models for Free-Space Beam, or with FC/PC Receptacle or Pigtailed with SM Fiber

Applications

Pulse Form Measurements

Pulse Duration Measurements

Precise Synchronization

Mode Beating Monitoring

Heterodyne Measurements

The UPD series of ultrafast photodetectors are best suited for measurement of optical waveforms from DC to 25 GHz. Various models feature rise times as short as 15 ps and cover the spectral range from 170 to 2600 nm.

All photodiodes are enclosed in compact and solid aluminum housings and can be biased with a battery or an external power supply.

The UV-extended versions of the silicon type photodetectors are the only commercial products that cover the spectral range from 170 to 1100 nm.

Another type of unique UV-sensitive InGaAs photodetectors can be used for detecting laser pulses in the range from 350 to 1700 nm, thus having the widest spectral range and the highest speed commercially available.

Perfect impedance matching and state-of-the-art microwave technology assure pulse form measurements without any ringing or artefacts. The customer is free to use a 50 Ω terminating resistor for highest speed operation, or a high impedance load for obtaining large signals. This guarantees maximum flexibility for diverse applications.

In combination with our BBA series of wideband high-gain amplifiers, the high-speed photodetectors are an advantageous alternative to the expensive and cumbersome avalanche photodiodes.

The UPD series high-speed photodetectors are indispensable tools for laser and photonics research.

New Photodetector Models Available: Faster Rise Times & Wider Wavelength Ranges

UPD-15-IR2-FC: Ultrafast InGaAs PIN photodetector, rise time < 15 ps, bandwidth> 25 GHz, spectral range 800 - 1700 nm, fiber-coupled input with FC/APC connector

UPD-35-IR2-P, UPD-35-IR2-D: Ultrafast InGaAs PIN photodetectors, rise time < 35 ps, bandwidth> 10 GHz, spectral range 800 - 1700 nm, with polished or diffuse window

UPD-35-UVIR-P, UPD-35-UVIR-D: Ultrafast InGaAs PIN photodetectors, rise time < 35 ps, bandwidth> 10 GHz, spectral range 350 - 1700 nm, with polished or diffuse window

UPD-50-SP, UPD-50-SD, UPD-50-UD, UPD-50-UP: Ultrafast Si PIN photodetector, rise time 50 ps, fall time 50 ps, bandwidth > 7 GHz, spectral range 170 - 1100 nm or 320 - 1100 nm, with polished or diffuse window

UPD-100-IR1-P: Ultrafast Ge photodetector, rise time < 100 ps, pulsewidth (FWHM) 300 ps, spectral range 400 - 2000 nm

UPD-3N-IR2-P: Fast InGaAs photodetector, extended infrared range up to 2.1 μm, rise time 150 ps

UPD-5N-IR2-P: Fast InGaAs photodetector, extended infrared range up to 2.6 μm, rise time 200 ps

Ultrafast Photodiodes (UPD Series) - Available Models

Photodetector Model	Rise Time (ps)	Band- width (GHz)	Spectral Range (nm)	Quantum Efficiency @ Peak	Sensitive Area (Dia. μm/mm²)	Noise Equiv. Power (W/√Hz)	Dark Current (nA)	Material	Optical Input / Window Type ¹⁾	RF Output Connec- tor
UPD-15-IR2-FC	< 15	> 25	800 - 1700	75%	Fiber, 9 μm	1.0 × 10^-15	0.1	InGaAs	Fiber w. FC/APC ⁵⁾	SMA
UPD-30-VSG-P	< 30	> 10	320 - 900	40%	200x200/0.04	3.0 × 10^-15	0.1	GaAs	Polished, glass	SMA
UPD-35-IR2-P	< 35	> 10	800 - 1700	80%	55/0.0024	1.0 × 10^-15	0.3	InGaAs	Polished, glass	SMA
UPD-35-IR2-D	< 35	> 10	800 - 1700	80%	55/0.0024	1.0 × 10^-15	0.3	InGaAs	Diffuse, quartz	SMA
UPD-35-IR2-FR	< 35	> 10	800 - 1700	80%	55/0.0024	1.0 × 10^-15	0.3	InGaAs	FC/PC receptacle ⁵⁾	SMA
UPD-35-IR2-FC	< 35	> 10	800 - 1700	80%	Fiber, 9 μm	1.0 × 10^-15	0.3	InGaAs	Fiber w. FC/APC ⁵⁾	SMA
UPD-35-UVIR-P	< 35	> 10	350 - 1700	80%	55/0.0024	1.0 × 10^-15	0.3	InGaAs ⁴⁾	Polished, MgF₂	SMA
UPD-35-UVIR-D	< 35	> 10	350 - 1700	80%	55/0.0024	1.0 × 10^-15	0.3	InGaAs ⁴⁾	Diffuse, quartz	SMA
UPD-40-VSI-P	< 40	> 8.5	500 - 1690	40%	200x200/0.04	3.0 × 10^-10	5000	InGaAs	Polished, glass	SMA
UPD-40-IR2-P	< 40	> 8.5	800 - 1700	80%	60/0.0028	1.1 × 10^-15	0.5	InGaAs	Polished, glass	SMA
UPD-40-IR2-D	< 40	> 8.5	800 - 1700	80%	60/0.0028	1.1 × 10^-15	0.5	InGaAs	Diffuse, quartz	SMA
UPD-40-IR2-FR	< 40	> 8.5	800 - 1700	80%	60/0.0028	1.1 × 10^-15	0.5	InGaAs	FC/PC receptacle ⁵⁾	SMA
UPD-40-IR2-FC	< 40	> 8.5	800 - 1700	80%	Fiber, 9 μm	1.1 × 10^-15	0.5	InGaAs	Fiber w. FC/APC ⁵⁾	SMA
UPD-40-UVIR-P	< 40	> 8.5	350 - 1700	80%	60/0.0028	1.1 × 10^-15	0.5	InGaAs ⁴⁾	Polished, MgF₂	SMA
UPD-40-UVIR-D	< 40	> 8.5	350 - 1700	80%	60/0.0028	1.1 × 10^-15	0.5	InGaAs ⁴⁾	Diffuse, quartz	SMA
UPD-50-SP	< 50	> 7.0	320 - 1100	45%	100/0.0079	1.2 × 10^-15	0.001	Si	Polished, glass	SMA
UPD-50-SD	< 50	> 7.0	320 - 1100	45%	100/0.0079	1.2 × 10^-15	0.001	Si	Diffuse, quartz	SMA
UPD-50-UP	< 50	> 7.0	170 - 1100	45%	100/0.0079	1.2 × 10^-15	0.001	Si ⁴⁾	Polished, MgF₂	SMA
UPD-50-UD	< 50	> 7.0	170 - 1100	45%	100/0.0079	1.2 × 10^-15	0.001	Si ⁴⁾	Diffuse, quartz	SMA
UPD-70-IR2-P	< 70	> 5.0	800 - 1700	80%	80/0.005	2.0 × 10^-15	0.8	InGaAs	Polished, glass	SMA
UPD-70-IR2-D	< 70	> 5.0	800 - 1700	80%	80/0.005	2.0 × 10^-15	0.8	InGaAs	Diffuse, quartz	SMA
UPD-70-IR2-FR	< 70	> 5.0	800 - 1700	80%	80/0.005	2.0 × 10^-15	0.8	InGaAs	FC/PC receptacle ⁵⁾	SMA
UPD-70-IR2-FC	< 70	> 5.0	800 - 1700	80%	Fiber, 9 μm	2.0 × 10^-15	0.8	InGaAs	Fiber w. FC/APC ⁵⁾	SMA
UPD-70-UVIR-P	< 70	> 5.0	350 - 1700	80%	80/0.005	2.0 × 10^-15	0.8	InGaAs ⁴⁾	Polished, MgF₂	SMA
UPD-70-UVIR-D	< 70	> 5.0	350 - 1700	80%	80/0.005	2.0 × 10^-15	0.8	InGaAs ⁴⁾	Diffuse, quartz	SMA
UPD-100-IR1-P	< 100	> 3.0	400 - 2000	80%	80/0.005	3.0 × 10^-13	700	Ge	Polished, glass	SMA
UPD-200-SP	< 175	> 2.0	320 - 1100	85%	400/0.126	1.5 × 10^-15	0.001	Si	Polished, glass	BNC
UPD-200-SD	< 175	> 2.0	320 - 1100	85%	400/0.126	1.5 × 10^-15	0.001	Si	Diffuse, quartz	BNC
UPD-200-UP	< 175	> 2.0	170 - 1100	85%	400/0.126	1.5 × 10^-15	0.001	Si ⁴⁾	Polished, MgF₂	BNC
UPD-200-UD	< 175	> 2.0	170 - 1100	85%	400/0.126	1.5 × 10^-15	0.001	Si ⁴⁾	Diffuse, quartz	BNC
UPD-300-SP	< 300	> 1.0	320 - 1100	90%	600/0.283	3.0 × 10^-15	0.01	Si	Polished, glass	BNC
UPD-300-SD	< 300	> 1.0	320 - 1100	90%	600/0.283	3.0 × 10^-15	0.01	Si	Diffuse, quartz	BNC
UPD-300-UP	< 300	> 1.0	170 - 1100	90%	600/0.283	3.0 × 10^-15	0.01	Si ⁴⁾	Polished, MgF₂	BNC
UPD-300-UD	< 300	> 1.0	170 - 1100	90%	600/0.283	3.0 × 10^-15	0.01	Si ⁴⁾	Diffuse, quartz	BNC
UPD-500-SP	< 500	> 0.6	320 - 1100	90%	800/0.5	3.5 × 10^-15	0.01	Si	Polished, glass	BNC
UPD-500-SD	< 500	> 0.6	320 - 1100	90%	800/0.5	3.5 × 10^-15	0.01	Si	Diffuse, quartz	BNC
UPD-500-UP	< 500	> 0.6	170 - 1100	90%	800/0.5	3.5 × 10^-15	0.01	Si ⁴⁾	Polished, MgF₂	BNC
UPD-500-UD	< 500	> 0.6	170 - 1100	90%	800/0.5	3.5 × 10^-15	0.01	Si ⁴⁾	Diffuse, quartz	BNC
UPD-3N-IR2-P	< 150 ⁶⁾	> 0.4 ⁶⁾	800 - 2100	75%	300/0.07	1.5 × 10^-13	90	InGaAs	Polished, glass	BNC
UPD-5N-IR2-P	< 200 ⁶⁾	> 0.3 ⁶⁾	800 - 2600	70%	300/0.07	7.0 × 10^-13	2000	InGaAs	Polished, glass	BNC
UPD-2M-IR2-P	< 75000	> 0.004	900 - 1700	80%	2000/3.14	4.0 × 10^-14	5	InGaAs	Polished, glass	BNC
UPD-2M-IR2-P-1TEC ³⁾	< 75000	> 0.004	900 - 1700	75%	2000/3.14	1.0 × 10^-14	0.3	InGaAs	Polished, glass	BNC