I CAN'T download the software via the school net, could you send me an installment package? Thank you for your inquiry! I will contact you directly so we can find a way to send the software to you. Though when I tried an UV source and fixed the wavelength around , it shows some power output. Can you tell me, what could be possible issue with the device. This is a response from Nicola at Thorlabs. Thank you for reporting this issue. As long as you use a light source in between 2 mW and 10 W in e.
Are you able to perform the zeroing properly? I will contact you directly to resolve the issue. For the calibration, the responsivity of the sensor head is measured over the whole wavelength range. The responsivity is the ratio of the current generated by the photodiode and the incident power in this case.
I will contact you directly to provide further information. Hi this is for PM I'd like to know if it's possible for me to gain access to the calibration data for my specific unit? This is a response from Michael at Thorlabs. Thank you very much for your inquiry. Yes, it is possible to get the calibration data for your specific sensor. I will contact you directly and be happy to send you the data.
The internal integration time is unfortunately determined by the AD converter used in these sensors. It cannot be changed. So it depends mainly on the parameters of your laser e. In general, thermal power sensors are better suited for pulsed lasers due to their measurement principle.
I will contact you directly so we can look for a good solution for your application. There are some questions about "PM" I already have a fluorescense light source which is connected to a microscope for optogenetic experiments and I would like to measure the light power. Please let me know.
Thank you. The PM is designed to be used to measure light in a wavelength range of nm and an optical power range between pW up to 5 mW without filter or mW with filter. Do these features match to your light source? I will contact you directly to check whether you need any further assistance.
As specified in the spec-sheet, the viewing target is removable. I've noticed that on the other side it is white. Can I assume it is reflective and for which wavelength? I'm asking this because I'm using the power meter in an integrating sphere with a non-monochromatic light and I was wondering if mounting the target the other way around would offer a reflectance similar to the one of the surface of the integrating sphere.
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. The substrate material used for the viewing target is not precisely defined. It is some sort of hard plastic. Basically the reflectivity is not specified but should be better than for the fluorescing side. I will contact you directly for further discussion. I'm now selecting a suitable equipment to measure the intensity of my light source. The light source is a Xenon type, and I would use filters to generate nm wavelength range, which is a broadband.
We have a uncalibrated spectrometer which can measure the relative light intensity with the wavelength like a spectrum. I have three questions:1 if I would like to measure the absolute intensity, which equipment would you recommend? Does the result represent the intensity at the wavelength I entered? Or it measures the total power? For a broadband light source thermal sensors such as the PM are a good choice. The PM has a flat absorption curve in your spectral range so the wavelength dependence is very low.
You can see a diagram of this curve on the website. The wavelength you enter will determine the calibration factor which is used for the conversion of the sensor signal to a power value. Due to the flat absorption in this range you can simply enter a value in the middle of your range e.
Powermeter sensors cannot separate the light of different wavelengths, they can only measure the total power. So the power value will represents the total power of the incoming beam. I have also contacted you directly to provide further assistance. I was trying to use the PM to evaluate my microscope Mercury lightsource spectrum and noticed that as I measure light power as a function of wavelength, the response is very linear, dropping from high power to low with increasing wavelength.
This is not normal, as peaks should appear in accordance with the emission spectra of the lightsource. Am I missing something here?
Can the power meter maybe not be used to measure absolute power, only relative power changes. I am very confused All help, would be much appreciated. HP Support Solutions is downloading. This product detection tool installs software on your Microsoft Windows device that allows HP to detect and gather data about your HP and Compaq products to provide quick access to support information and solutions.
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Please refer to the Definitions tab to see how these parameters are calculated. Which sensors can I use for measuring femtosecond pulses?
A thermal sensor will provide the best results when measuring the average power of a femtosecond laser pulse. If we assume that the bandwidth is equivalent to the maximum pulse repetition rate, this parameter can be altered by changing the input resistance of the measurement device. In the case of a power meter console, the input resistance is fixed at 1 M? In order to increase the repetition rate, see the Sensor Tutorial tab for how to accomplish this using an oscilloscope and a k?
What is the difference between resolution and minimum optical power? The resolution is the minimum detectable change of power. The minimum optical power is given by the optical power range of the sensor. Please see the Tutorial tab for an example. Measurement Range - The ranges that the power meter console can display power or energy readings. The optical power or energy measurement ranges for Consoles are stated in terms of current photodiode sensors or voltage thermal and pyroelectric sensors.
How the current or voltage is converted to a power or energy measurement is sensor dependent. Display Resolution - The minimum detectable change in power or energy that can be shown on the power meter console's display screen.
These values are also given in terms of current or voltage, as this is the input that the console measures. The optical power resolution will depend on the responsivity of the detector connected to the console.
Current Input Resolution - This specification applies to photodiode sensors and is generally specified in terms of current per responsivity value, e. This means that the console has a resolution of 1 pA in its lowest measurment range. Note at this is not the minimum measurable power. As the responsivity of photodiode sensors is wavelength dependent, the power resolution of the console will be wavelength dependent as well.
Example: An SC sensor has a responsivity of 7. In the lowest measurement range the displayed power resolution is at nm given by 1. Note that this is not the same as the minimum measurable optical power for the SC of 50 nW. Voltage Input Resolution - Typically, power and energy meters will have the voltage resolution specified separately for thermopile and pyroelectric sensors.
As with photodiode sensors, the power resolution will depend on the responsivity of the sensor. Again, the energy resolution is sensor dependent. Accuracy - The power meter accuracy is determined by the voltage or current measurement accuracy. The console's accuracy is a different specification than the sensor's measurement uncertainty.
Wavelength Correction - A value that can be entered into the console in order to apply the correct responsivity so that the correct power or energy reading calculated and displayed. Thorlabs calibrated sensors have a responsivity calibration tables stored in their connectors.
Our consoles can access this information to perform the power or energy calculation. For custom sensors, the console needs to be set to the correct sensor type photodiode, thermal, or pyroelectric and the responsivity will need to be entered as a numerical value.
The following equations can be used to quickly convert the parameters defining a square pulse train into values that can be compared to the specifications of our sensors. The first table outlines how use the pulse duration and pulse period to calculate the repetition rate and duty cycle, how to convert between average and peak power, and how to use the power to determine the total energy in your pulse.
The second table describes how calculate the power and energy densities for a circular beam with a square pulse train using these parameters. The diagram above outlines the defining properties of a square pulse train.
Power and Energy Density Power density and energy density are defined as the power or energy per unit area of a beam, respectively. The following formulas are based on a circular beam shapre with a beam diameter d B and an area of. The average power density is the ratio of the average power of the light beam to the area illuminated by the beam. Characters are Case-Sensitive. Please Wait. Power Meter Measurements Thorlabs' power meter consoles have the ability to recognize the connected sensor type as well as its responsivity.
Photodiode Sensors Photodiode sensors deliver a current that depends on the optical power and wavelength of the incident beam. Thermal Sensors Thermal sensors deliver a voltage that is proportional to the input optical power. Energy Sensors Energy sensors are based on the pyroelectric effect. Calibration of a Power Meter Console. The light source and the reference photodiode are chosen depending on the sensor type to be calibrated.
Prior to any calibration scan, a monitor diode is used to observe power variations due to lamp aging. A reference scan is carried out and the reference current I Ref vs. This allows the calculation of the optical power at each wavelength step. The reference diode is replaced by the DuT.
The wavelength scan is repeated, and its current I DuT vs. The responsivity of the DuT is then calculated over the entire specified wavelength range of the DuT with a step size of 5 nm. These data sets responsivity and wavelength are saved to the sensor's memory, located in the DSUB connector. Additionally, the calibration data are printed out to the Certificate of Calibration and are saved to our server.
Traceability All our equipment used for calibration is traceable to both national and international standards and is periodically recalibrated to maintain the required standards. National Standard Lab. Click to Enlarge The PM wireless power meter, shown here with an iPad mini not included , can be remotely operated using Apple mobile devices.
Sensor Options Arranged by Wavelength Range. Sensor Options Arranged by Power Range. Photodiode sensors deliver a current that depends on the input optical power and the wavelength. The current is fed into a transimpedance amplifier, which outputs a voltage proportional to the input current. The photodiode's responsivity is wavelength dependent, so the correct wavelength must be entered into the console for an accurate power reading.
The console reads out the responsivity for this wavelength from the connected sensor and calculates the optical power from the measured photocurrent. Thermal sensors deliver a voltage proportional to the input optical power.
Based on the measured sensor output voltage and the sensor's responsivity, the console will calculate the incident optical power. They deliver a voltage peak proportional to the pulse energy. If an energy sensor is recognized, the console will use a peak voltage detector and the pulse energy will be calculated from the sensor's responsivity.
The filter position is automatically detected by the power meter to correctly calibrate the power measurement. Without the filter, the power measurement range is pW to 5 mW, while with the filter, the range is 5 mW to mW. The position of the ND filter is automatically detected by the power meter.
Choosing a Sensor Beam Size Compared to the Sensor's Active Area Most sensors do not provide completely uniform response over their active area with the exception of integrating sphere sensors, which incorporate this feature as part of their design. Below are some hints and recommendations to minimize the effects of noise: Power sensors should be grounded directly to the earth e.
Energy sensors should be mounted so that they are isolated from earth ground since the housing is connected to the analog ground of the power meter. Since the sensor cable can conduct very small currents or voltage signals, and cable capacitance induces disturbances when the cable is moved, the cable should be in a fixed position for very small power or energy measurments.
The bandwidth should be set to the "Low" setting for photodiode sensors. For thermal sensors, the acceleration circuit should be shut off. The detector noise is lowest for Si or InGaAs sensors. Long-term measurements in free-space applications require constant ambient light conditions or shielding the light path from external light sources.
The temperature should be stable over the time of the measurement. Special Considerations for Energy Sensors Thorlabs' energy sensors are based on the pyroelectric effect and have a thermal time constant of 20 ms. Click to Enlarge. In the image to the left, the open port of the T-adapter is ready to be plugged into the BNC input of an oscilloscope. Click to Enlarge Several of our consoles feature a statistics view, where parameters such as the min and max detected power are displayed.
Click to Enlarge The needle view marks the maximum and minimum detected power with a green and a yellow arrow, respectively. This feature can be useful for determining the appropriate power range for detecting pulsed signals with a photodiode sensor. Frequently Asked Questions Can the maximum repetition rate of an energy sensor be increased? The specified measurement uncertainty only applies for this wavelength range.
All Sensors Resolution This is the minimum detectable change of the measured parameter. Resolution is always specified for a certain console type and bandwith setting, which is typically given in the footnotes of the specifications table on the sensor's spec sheet. All Sensors Measurement Uncertainty This parameter indicates the measurement accuracy and is generally specified for the entire wavelength range of the sensor. For certain sensor types, several values may be specified on the specification sheet , with different values corresponding to different regions of the specified wavelength range.
All Sensors Optical Power Range The optical power range lists the minimum and maximum measurable power that the sensor can detect. Exceeding the upper limit leads to sensor saturation and incorrect measurement results. When measuring pulsed signals, the peak power of the pulse must not exceed the maximum measurable power to avoid saturation. Attempting to use a sensor to acquire power measurements below the lower limit will increase the measurement uncertainty due to the effects of noise.
Care should be taken when setting the trigger level to measure pulses with energy levels close to the lower limit of the optical energy range. Sensor noise may interfere with the pulse edge triggering the sensor correctly, causing incorrecte measurement results. Pyroelectric Max Average Power Density The average power per unit area that can be incident on the sensor without causing damage. This value must not be exceeded to avoid damaging the sensor. Equations for calculating the average power density of a light source with a square pulse train and circular beam shape are given below in the Calculations section.
The total energy in a pulse must not exceed this value to avoid damaging the sensor. Photodiode Max Pulse Energy Density Another alternative specification to the max average power density. The maximum energy density a pulse can have before causing damage to the sensor. Besides thermal sensors and integrating spheres, we provide this specification for our fiber power sensors.
Fibers may have a very small beam diameter at the tip, leading to high energy densities that could damage the sensor if they are above this specification.
All Sensors Max Intermittent Power 2 minutes Max The maximum power that can be applied to the sensor for less than 2 minutes without causing damage. We have appropriate drivers for Ubuntu for the optical power monitor software. Would be great if they were also compatible with the Mac OS, or can be interfaced via Python drivers. This is a response from Wolfgang at Thorlabs. We have a wrapper file for the driver and a sample code so the PM16 devices can be used in Python.
These are however based on the Windows driver and only work on a Windows system. These files are included in the latest version of the power meter software. I CAN'T download the software via the school net, could you send me an installment package? Thank you for your inquiry! I will contact you directly so we can find a way to send the software to you. Though when I tried an UV source and fixed the wavelength around , it shows some power output.
Can you tell me, what could be possible issue with the device. This is a response from Nicola at Thorlabs. Thank you for reporting this issue.
As long as you use a light source in between 2 mW and 10 W in e. Are you able to perform the zeroing properly? I will contact you directly to resolve the issue. For the calibration, the responsivity of the sensor head is measured over the whole wavelength range. The responsivity is the ratio of the current generated by the photodiode and the incident power in this case.
I will contact you directly to provide further information. Hi this is for PM I'd like to know if it's possible for me to gain access to the calibration data for my specific unit?
This is a response from Michael at Thorlabs. Yes, it is possible to get the calibration data for your specific sensor.
I will contact you directly and be happy to send you the data. The internal integration time is unfortunately determined by the AD converter used in these sensors. It cannot be changed. So it depends mainly on the parameters of your laser e. In general, thermal power sensors are better suited for pulsed lasers due to their measurement principle. I will contact you directly so we can look for a good solution for your application.
There are some questions about "PM" I already have a fluorescense light source which is connected to a microscope for optogenetic experiments and I would like to measure the light power. Please let me know.
Thank you. The PM is designed to be used to measure light in a wavelength range of nm and an optical power range between pW up to 5 mW without filter or mW with filter.
Do these features match to your light source? I will contact you directly to check whether you need any further assistance. As specified in the spec-sheet, the viewing target is removable. I've noticed that on the other side it is white. Can I assume it is reflective and for which wavelength? I'm asking this because I'm using the power meter in an integrating sphere with a non-monochromatic light and I was wondering if mounting the target the other way around would offer a reflectance similar to the one of the surface of the integrating sphere.
This is a response from Sebastian at Thorlabs. Thank you for the inquiry. The substrate material used for the viewing target is not precisely defined. It is some sort of hard plastic. Basically the reflectivity is not specified but should be better than for the fluorescing side. I will contact you directly for further discussion. I'm now selecting a suitable equipment to measure the intensity of my light source. The light source is a Xenon type, and I would use filters to generate nm wavelength range, which is a broadband.
We have a uncalibrated spectrometer which can measure the relative light intensity with the wavelength like a spectrum. I have three questions:1 if I would like to measure the absolute intensity, which equipment would you recommend?
Does the result represent the intensity at the wavelength I entered? Or it measures the total power? For a broadband light source thermal sensors such as the PM are a good choice. The PM has a flat absorption curve in your spectral range so the wavelength dependence is very low. You can see a diagram of this curve on the website.
The wavelength you enter will determine the calibration factor which is used for the conversion of the sensor signal to a power value. Due to the flat absorption in this range you can simply enter a value in the middle of your range e.
Powermeter sensors cannot separate the light of different wavelengths, they can only measure the total power. So the power value will represents the total power of the incoming beam. I have also contacted you directly to provide further assistance. I was trying to use the PM to evaluate my microscope Mercury lightsource spectrum and noticed that as I measure light power as a function of wavelength, the response is very linear, dropping from high power to low with increasing wavelength.
This is not normal, as peaks should appear in accordance with the emission spectra of the lightsource. Am I missing something here? Can the power meter maybe not be used to measure absolute power, only relative power changes. I am very confused All help, would be much appreciated. It can be used to measure the absolute optical power traceable to a National Standard.
The responsivity vs wavelength is not constant for this sensor. When measuring broadband sources the results have to be corrected in view of the light sources' spectrum. In case the spectrum is known it can be loaded into the console and the displayed values will be automatically corrected.
Unfortunately, in our PMSeries this feature is not implemented.
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