Newport Corporation | High Speed Biased Photodetectors, 818-BB Series

High Speed Biased Photodetectors, 818-BB Series

Silicon, GaAs and InGaAs high speed biased photodetectors
Rise times down to 35 ps
Amplified detectors provide up to 26 dB gain
Built-in bias supply on unamplified photodetectors (except for BB-22 and BB-40)

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DescriptionSpecifications Models Catalog PDF

818-BB Series Biased Photodiode Detectors are cost effective diagnostic tools suitable for a variety of high speed applications such as viewing of Q-switched, mode-locked, or rapidly modulated laser signals and picosecond laser alignment.

Standard photodetectors (818-BB-20, -21, -30, -31 and -40) consist of free-space, small and large area Si, GaAs or InGaAs detectors, with rise times ranging from 175 ps–30 ns. Each unit, other than the 818-BB-40, includes a built-in bias supply consisting of standard 3 V lithium cells and a 50 ohm BNC connector output. The batteries are easily replaceable and by disconnecting the detector from the oscilloscope input, when not in use, you can extend the lifetime of the batteries. The 818-BB-40 comes with an external 24 VDC power supply.

The 818-BB-35 and 818-BB-45 photodiode detector modules offer a low-cost solution for ultra-fast measurements offering a 10 GHz bandwidth. These detectors are suitable for applications where detector risetime of <35 psec are required for Q-switched and Ultrafast Laser output analysis. These detectors also utilize 3 V lithium cells (supplied).

The 818-BB-22 UV Enhanced Silicon Detector module consists of a silicon detector with an enhanced ultraviolet response, making it well suited for the fourth harmonic Nd:YAG, YLF or Glass Lasers and Excimer Lasers. Additionally, its large active area and fast response time make it an excellent general-purpose biased detector for the 200 to 1100 nm wavelength region. To attain its fast response, this detector comes with a 24 VDC external power supply.

The 818-BB-21A, -30A, -35A, and -45A, amplified high speed detector modules consist of Si or InGaAs detectors having a built-in amplifier with approximately up to 26 dB of gain. It is excellent for viewing rapid modulation of low-power CW lasers or other light sources in the µW regime. The detectors are AC coupled and feature a bandwidth ranging from 75 kHz up to 10.7 GHz. A wall plug-in style power supply is provided with these units.

The 818-BB-35F, -45F, -35AF and -45AF are 1 meter long single mode fiber coupled high speed detectors with an FC connector .

The 818-BB-21TTL and-30TTL TTL photodetectors are based on our standard detectors with an additional TTL output whose threshold is adjustable, while their analog out exhibits performance characteristics on par with our equivalent standard products.

Detector Responsivity

Silicon

UV Enhanced Silicon

GaAs

InGaAs

Dimensions

Related Products

For spatial beam profile diagnostics, see High Resolution CCD Laser Beam Profiler

Multiple Scanning Knife-Edge Beam Profiler

• For optical detectors for calibrated power measurement, see the Optical Detectors For Power Meters Chapter

Specifications (Unamplified)

Model	818-BB-20 ⁽²⁾	818-BB-21 ⁽²⁾	818-BB-22 ⁽⁵⁾	818-BB-30 ⁽²⁾	818-BB-31 ⁽²⁾	818-BB-35 818-BB-35F ^(2,6,8)	818-BB-40 ⁽⁵⁾	818-BB-45 818-BB-45F ^(2,6)	818-BB-50 818-BB-50F ^(5,6)
Spectral Range (µm)	0.3-1.1	0.3-1.1	0.2-1.1	1.0-1.6	1.0-1.6	1.0-1.65	0.3-1.1	0.4-0.9	0.83-2.1
Material	Silicon	Silicon	Silicon	InGaAs	InGaAs	InGaAs	Silicon	GaAs	Extended InGaAs
Rise Time (ps)	<200	<300	<1.5 ns	<175	<225	<35	<30 ns	<35	<35
Fall Time (ps)	<350	<300	<1.5 ns	<175	<225	<35	<30 ns	<35	<35
Responsivity	0.4 A/W@ 830 nm	0.4 A/W @ 830 nm	0.5 A/W @ 830 nm	0.8 A/W @ 1300 nm	0.8 A/W @ 1300 nm	0.88 A/W @ 1550 nm	0.5 A/W @ 830 nm	0.45 A/W @ 850 nm	1.6 A/W @ 2.0 u⁽¹⁾
Bias Voltage (V)	3	9	24	6	6	6	24	6	3
Impedance, Load (Ω)	50	50	50	50	50	50	50	50	50
Cut Off Frequency (GHz)	>1.5	>1.2	>200 MHz	>2	>1.5	>12.5	>25 MHz	>10	>10 ^(3,4)
Active Diameter (µm)	Square: 80	400	2.55 mm	100	100	32	4.57 mm	40	40
Dark Current (nA)	<1	<0.1	<10	<1	<1	<3	<20	<200 p A	<10 u-
Junction Capacitance (pF)	<4	<1.5	<10	<0.75	<1.25	<0.12	<45	<0.3	-
Reverse Breakdown (V)	40	20	150	25	25	25	50	30	-
Acceptance Angle⁽⁷⁾	20°	30°	50°	20°	-	-	60°	-	-
Saturation Current (mA)	50	10	10	10	10	10	10	10	-
NEP (pW/√Hz)	<0.1	<1.5	<1	<0.1	<0.1	<0.04	<0.16	<0.02	<2 pW/√Hz @ 2.0 u
Output Connector	BNC	BNC	BNC	BNC	BNC	SMA	BNC	SMA	SMA
Mounting (tapped hole)	8-32 and M4	8-32 and M4	8-32 and M4	8-32 and M4	8-32 and M4	8-32 and M4	8-32 and M4	8-32 and M4	8-32 and M4
Fiber Optic Connector	-	-	-	-	FC input receptacle on detector body	FC	-

Specifications (Amplified, AC-coupled)

Model	818-BB-21A ⁽⁵⁾	818-BB-30A ⁽⁵⁾	818-BB-35A 818-BB-35AF ^(5,6)	818-BB-45A 818-BB-45AF ^(5,6)
Spectral Range (µm)	0.3-1.1	1.0-1.6	1.0-1.65	0.4-0.9
Material	Silicon	InGaAs	InGaAs	GaAs
Rise Time (ps)	<500	<400	<37	<37
Fall Time (ps)	<500	<400	<37	<37
Responsivity (V/W)	500 V/W @ 830 nm ⁽¹⁾	400 V/W @ 1300 nm ⁽¹⁾	900 V/W @ 1550 nm ⁽¹⁾	450 V/W @ 850 nm ⁽¹⁾
Bias Voltage (V)	24	24	5	5
Impedance, Load (Ω)	50	50	50	50
Cut Off Frequency (GHz)	>1.2^(3,4)	>1.5^(3,4)	>10.7^(3,4)	>10.7 ^(3,4)
Active Diameter (µm)	400	100	32	40
Acceptance Angle⁽⁷⁾	30°	20°	-	-
Saturation Current (mA)	10	10	-	-
NEP (pW/√Hz)	<60	<30	<25	<25
Output Connector	BNC	BNC	SMA	SMA
Mounting (tapped hole)	8-32 and M4	8-32 and M4	8-32 and M4	8-32 and M4
Fiber Optic Connector	-	-	1m SMF pigtail w/ FC (optional)	1m SMF pigtail w/ FC (optional)

Specifications (TTL detectors)

Model	818-BB-21TTL ⁽⁵⁾	818-BB-30TTL ⁽⁵⁾
Analog Output
Spectral Range (µm)	0.45-0.87	1.0-1.6
Material	Silicon	InGaAs
Rise Time (ps)	<300	<175
Fall Time (ps)	<300	<175
Responsivity (A/W)	0.4 @ 830 nm⁽¹⁾	0.8 @ 1.3 µm⁽¹⁾
Power Supply (V)	12	12
Impedance, Load (Ω)	50	50
Cut Off Frequency (GHz)	>1.2⁽⁴⁾	>2⁽⁴⁾
Active Diameter (µm)	400	100
Acceptance Angle⁽⁷⁾	10°	20°
Saturation Current (mA)	10	10
Output Connector	BNC	BNC
Mounting (tapped hole)	8-32 and M4	8-32 and M4
Fiber Optic Connector	-	-
TTL Output
Rise Time (ns)	< 8
Fall Time (nm)	< 9
Adjustable Trigger Threshold (mV)	40 - 500
Threshold Monitor	External
Minimum Detectable Pulse Width (ns)	< 8
Frequency Response	DC - 60 MHz
Logic High (V)	> 3.0
Logic Low (V)	< 0.5
Pulse Stretch (when enabled) (ns)	100 typ.
Termination (Ω)	500 typ.
Output Connector	BNC

1) Detector has maximum output voltage of 500 mV.
2) Batteries are included.
3) AC coupled detector requiring input of >30 kHz.
4) If the full bandwidth is not needed, use lowpass, bandpass or highpass filters to remove excess noise.
5) Includes a universal AC/DC adaptor.
6) The -XXF versions have a 1 m, single-mode fiber pigtail with an FC/PC connector.
7) Half-angle.
8) 818-BB-35F comes with a wall plug supply.

	Model	Description
	818-BB-20	Biased Photodetector, 300-1100nm, Silicon, 3V Bias
	818-BB-21	Biased Photodetector, 300-1100nm, Silicon, 9V Bias
	818-BB-21A	Amplified, Biased Photodetector, AC coupled, 300-1100nm, Silicon, 24V Bias
	818-BB-21TTL	TTL & Analog Detector, 450-870 nm, Silicon
	818-BB-22	Biased Photodetector, 200-1100nm, Silicon, 24V Bias
	818-BB-30	Biased Photodetector, 1000-1600nm, InGaAs, 6V Bias
	818-BB-30A	Amplified Biased Photodetector, AC coupled, 1000-1600nm, InGaAs, 24V Bias
	818-BB-30TTL	TTL & Analog Detector, 1000-1650 nm, InGaAs
	818-BB-31	Biased Photodetector, 1000-1600nm, InGaAs, 6V Bias, FC Receptacle
	818-BB-35	Biased Photodetector, 1000-1650nm, InGaAs, 6V Bias
	818-BB-35A	Amplified Biased Photodetector, AC coupled, 1000-1650nm, InGaAs, 5V Bias
	818-BB-35AF	Amplified Biased Photodetector, AC coupled, 1000-1650nm, InGaAs, 5V Bias, 1M FC Pigtail
	818-BB-35F	Biased Photodetector, 1000-1650nm, InGaAs, 5V Bias, 1M FC Pigtail
	818-BB-40	Biased Photodetector, 300-1100nm Silicon, 24V Bias
	818-BB-45	Biased Photodetector, 400-900nm, GaAs, 6V Bias
	818-BB-45A	Amplified Biased Photodetector, AC coupled, 400-900nm, GaAs, 6V Bias
	818-BB-45AF	Amplified Biased Photodetector, AC coupled, 400-900nm, GaAs, 6V Bias, 1M FC Pigtail
	818-BB-45F	Biased Photodetector, 400-900nm, GaAs, 6V Bias, 1M FC Pigtail

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