What units are required for the two-photon cross-section input?

The cross-section is entered in Göppert-Mayer (GM) units, where 1 GM equals 10⁻⁵⁰ cm⁴ s photon⁻¹.

Can the calculator handle different laser wavelengths?

Yes, users input the laser wavelength in nanometers; the tool uses this value in the two-photon absorption equation to compute the excitation rate.

What does the exposure time parameter represent?

Exposure time (τ) is the duration the sample is illuminated by the laser, and it directly affects the total number of excitations per molecule calculated.

Is the result affected by the focus size of the laser beam?

Yes, the focus size (FWHM) is a required input; a smaller focus increases the photon flux and typically raises the excitation rate.

ChemistryFree Tool

Two-Photon Absorption Calculator

Provided byOmni Calculatoromnicalculator.com

Use the two-photon absorption calculator to calculate the expected excitation rate in a two-photon absorption process.

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About this tool

What Two-Photon Absorption Calculator does

The Two-Photon Absorption Calculator on Omni Calculator determines the expected excitation rate for molecules undergoing two-photon absorption. Users input parameters such as the two-photon cross-section, laser power, wavelength, focus size, and exposure time to calculate the number of excitations per molecule. The tool provides a straightforward way to estimate the efficiency of molecules in absorbing two photons simultaneously, which is essential for researchers working in photochemistry, advanced materials, and bioimaging. The result shows the predicted excitation rate, helping users assess whether a given laser source will effectively excite their target molecule. The site also includes a brief explanation of the underlying physics and a worked example to guide interpretation of the output.

Step by step

How to use the Omni Calculator Two-Photon Absorption Calculator

1
Enter the two-photon cross-section (δ) in units of GM (Göppert-Mayer)
2
Input the laser power (P) delivered to the sample
3
Provide the laser wavelength (λ) in nanometers
4
Specify the focus size (FWHM) of the beam in micrometers
5
Set the exposure time (τ) in seconds to calculate excitations per molecule (N)

Is it right for you

Best for

Researchers and chemists in academia or industry who need quick, estimates of two-photon excitation efficiency for molecules under specific laser conditions.

Limitations

Results are estimates based on provided input parameters
No unit switching between common measurement systems
Does not account for sample concentration or environmental effects

Questions

Two-Photon Absorption Calculator FAQ

What units are required for the two-photon cross-section input?: The cross-section is entered in Göppert-Mayer (GM) units, where 1 GM equals 10⁻⁵⁰ cm⁴ s photon⁻¹.
Can the calculator handle different laser wavelengths?: Yes, users input the laser wavelength in nanometers; the tool uses this value in the two-photon absorption equation to compute the excitation rate.
What does the exposure time parameter represent?: Exposure time (τ) is the duration the sample is illuminated by the laser, and it directly affects the total number of excitations per molecule calculated.
Is the result affected by the focus size of the laser beam?: Yes, the focus size (FWHM) is a required input; a smaller focus increases the photon flux and typically raises the excitation rate.

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