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Optical Detector Selection Guide
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Newport offers a complete line of optical meters and detectors, enabling low and high-power, as well as energy measurements. Four types of photodetectors can be used with our optical meters: Low-Power Semiconductor Photodiodes, High-Power Thermopile Detectors, Pyroelectric Energy Detectors and Integrating Spheres. This detector line is very flexible and can be used to measure power and energy with both free-space and fiber optic inputs.
The following tables, in combination with the Detector Performance Charts, should help identify the optical meter/detector combination appropriate for your particular optical measurement needs. It is always a good idea to select a detector that suits your needs before selecting an optical meter. For help in optical power meter selection, see Power Meter Selection Guide.
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| Photodiode Detectors |
| Model |
Features and Benefits |
| Common Features |
• Complete fiber optic and free space optic accessories available (see Photodiode Detector Accessories)
• Highest quality photodiodes are used
• Low NEP (noise equivalent power) with wide dynamic ranges
• EMI/RFI shield to minimize noise from environment |
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Low-Cost Photodetectors, Entry level 818-xx-L Series
• Low Cost, ideal for low budget and low power applications
• Power levels from pW to 3 mW
• Detachable Calibration Modules
• /DB suffix indicates DB15 calibration module, no /CM models |
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Low-Power Photodetector, 818 Series
• Industry standard models with broad customer base
• Power levels from pW to 3 W via a matching OD3 attenuator
• Both DB15 (/DB models) and 8-pin DIN (/CM models) calibration modules available, all detachable |
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Low-Power Photodetectors, 918D Series
• Most advanced new models
• Power levels from pW to 3 W with an integrated OD3 attenuator
• Automatic thermal drift compensation with an integrated thermistor
• Automatic detection of the attenuator On/OFF by an optical power meter
• Designed for lowest noise operation
• DB15 calibration module only |
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UV/Si Detectors, Wand
• Si and UV-enhanced Si detectors available (200 – 1100 nm)
• Slim design with an integrated sliding OD3 attenuator
• UV detector comes with a highly protective and rugged aluminum housing
• Both DB15 (/DB models) and 8-pin DIN (/CM models) calibration modules available, all detachable |
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Fiber Optic Detectors
• Integrating sphere design enabling the most accurate and polarization independent measurements from all fiber optic sources
• Continuous measurements over the entire 400–1650 nm wavelength range
• Optical power input up to 200 mW
• Bare fiber and FC, ST, LC, and SC connector adapters come in a carrying case along with the detector |
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Integrating Sphere
• Total collection of light and spatial integration - useful for divergent and non-symmetrical beams
• Measurements insensitive to exact detector positioning
• Signal attenuation, advantageous in measurement of high-power beams
• High reflectance coating avoids direct damage from the first strike of the beam
• Variety of configurational options available |
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| Thermal and Pyroelectric Detectors |
| Model |
Features and Benefits |
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Thermopile Detectors, 818P Series
• Ideal for high power laser cw power measurement
• Very high sensitivity to optical power
• High damage threshold
• Broadband flat spectral response from 0.19–11 µm
• NIST-traceable calibration included
• Insensitive to beam position |
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Pyroelectric Detector, Energy 818E Series
• Ideal for high pulse energy measurement from 0.19 – 20 um
• High repetition rates
• High damage threshold
• NIST-traceable calibration included |
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The following table provides an easy compatibility chart for Newport’s various active and obsolete optical power meters and detectors. Also see Power Meter Selection Guide.
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| Power Meter and Detector Compatibility Chart |
| Power Meter |
818-xx(-L) |
818-xx/CM
818-F-xx |
818-xx(-L)/DB
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918 |
918D |
818P |
818E |
1935-C/2935-C**
1936-C/2936-C(Optical Power and Energy Meters, High Performance, 1936-C/2936-C ) |
15-pin CM* |
841-DIN |
√ |
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√ |
√ |
√ |
| 1931-C/2931-C(Optical Power Meters, High-Performance, 1931-C/2931-C) |
15-pin CM* |
841-DIN |
√ |
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√ |
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| 1928-C(Benchtop Optical Meter, 1928-C) |
15-pin CM* |
841-DIN |
√ |
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√ |
√ |
√ |
| 1918-C(Optical Power Meter, High-Performance Hand-Held, 1918-C) |
15-pin CM* |
841-DIN |
√ |
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√ |
√ |
√ |
| 842-PE(Portable Optical Power Meter, 842-PE) |
15-pin CM* |
841-DIN |
√ |
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√ |
√ |
√ |
| 1916-C(Portable Optical Power Meter, 1916-C) |
15-pin CM* |
841-DIN |
√ |
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√ |
√ |
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| 841-P-USB(Virtual Optical Power Meter, 841-P-USB) |
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√ |
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| 1815-C (obsolete) |
√ |
Remove Cal Module (CM) |
Remove Cal Module (CM) |
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818P-BNC |
818P-BNC |
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| 1825-C (obsolete) |
√ |
Remove Cal Module (CM) |
Remove Cal Module (CM) |
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818P-BNC |
818P-BNC |
818P-BNC |
| 1835-C/2835-C (obsolete) |
8-pin CM* |
√ |
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818P-DIN |
818P-DIN |
| 2832-C (obsolete) |
8-pin CM* |
√ |
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| 1830-C (obsolete) |
8-pin CM* |
√ |
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| 840-C (obsolete) |
8-pin CM* |
√ |
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| 1930-C/2930-C (obsolete) |
8-pin CM* + 818-ADAPT-OPM |
818-ADAPT-OPM |
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√ |
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| 841-PE (obsolete) |
8-pin CM* + 841-DIN |
841-DIN |
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√ |
√ |
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On the left is /DB and on the right is the /CM calibration module, respectively.
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Notes: √ indicates that the power meter and the optical detector combinations are directly compatible, while "blank" indicates incompatible. Otherwise, an adapter is required as mentioned in the table.
* 8-pin CM or 15-pin CM indicate that a 8-pin or a 15-pin calibration module is required, respectively. Please contact Newport to obtain one at 1-800-222-6440 or Tech@newport.com.
** 1935-C and 2935-C were replaced by 1936-C and 2936-C.
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| Power Measurements |
| Mode |
Repetition Rate |
Power Level |
Detector Family |
Power Meter |
| CW |
N/A |
11fW–2W(2) |
Low-Power Photodetector, 818 Series
Low-Power Photodetectors, 918D Series |
1918-C, 1928-C, 842-PE, 1916-C, 1931-C, 1936-C, 2931-C, 2936-C |
| N/A |
100pW–0.2W |
Fiber Optic Detectors |
| N/A |
15pW–20W+(4) |
Integrating Sphere |
| N/A |
1mW–400W |
Thermopile Detectors, 818P Series |
842-PE, 1916-C, 1918-C, 1928-C, 1936-C, 2936-C |
| Pulsed |
>10 Hz |
1mW–400W (<0.6 J/cm2) |
Thermopile Detectors, 818P Series |
842-PE, 1916-C, 1918-C, 1928-C, 1936-C, 2936-C |
| >100 Hz(1) |
1pW–2W(2) (<1 µJ/cm2) |
Low-Power Photodetector, 818 Series
Low-Power Photodetectors, 918D Series |
842-PE, 1916-C, 1918-C, 1928-C, 1931-C, 1936-C, 2931-C, 2936-C |
| 100pW–0.2W (>1 µJ) |
Fiber Optic Detectors |
| 15pW–20W+(4) |
Integrating Sphere |
| Peak-to-Peak |
<200 kHz(1) |
11fW–2W(2) |
Low-Power Photodetector, 818 Series
Low-Power Photodetectors, 918D Series |
842-PE, 1918-C, 1931-C, 2936-C, 1935-C, 2936-C |
| 100pW–0.2W |
Fiber Optic Detectors |
| 15pW–20W+(4) |
Integrating Sphere |
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| Pulse Energy Measurements |
| Mode |
Repetition Rate |
Energy Level |
Detector Family |
Power Meter |
Energy
per Pulse |
Single pulse–6000 Hz(1) |
>20 µJ |
Pyroelectric Detector, Energy 818E Series |
842-PE, 1918-C, 1928-C, 1936-C, 2936-C |
| >10 Hz |
<5 J/cm2(>1mW avg.) |
Thermopile Detectors, 818P Series(4) |
842-PE, 1918-C, 1928-C, 1936-C, 2936-C |
| >100 Hz(1) |
<1 µJ/cm2 (1pW–2W(2)) |
Low-Power Photodetector, 818 Series(4)
Low-Power Photodetectors, 918D Series |
842-PE, 1916-C, 1918-C, 1928-C
1931-C, 1936-C, 2931-C, 2936-C |
| <100 µJ (100pW–0.2W) |
Fiber Optic Detectors(4) |
| 15pW–20W+(3) |
Integrating Sphere(4) |
Integrated
(power x time) |
>10 Hz |
<5 J/cm2(>1mW avg.) |
Thermopile Detectors, 818P Series |
842-PE, 1918-C, 1928-C, 1936-C, 2936-C |
| >100 Hz(1) |
1pW–0.2W(2) |
Low-Power Photodetector, 818 Series
Low-Power Photodetectors, 918D Series |
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1) Power meter dependent. Minimum 1% duty cycle is recommended.
2) Maximum peak power density for OD3 attenuator that comes with the 818/918D Series detectors is 2W/cm2.
3) Upper power limit depends on several factors, e.g., sphere size, port aperture size and wavelength.
4) These detectors actually measure power, but the energy can be derived by the calculation, energy = power/(rep rate).
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| Detector Performance Charts |
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