Multiphoton Microscopy
Two-Photon & Three-Photon Imaging for Deeper Insight
Imaging deep inside biological tissue requires more than high resolution. Excitation wavelength, pulse characteristics, optical design, scanning and detection all influence how deeply you can image—and how much useful signal you can collect without unnecessarily affecting the sample.
Two-photon (2P) and three-photon (3P) microscopy use ultrafast excitation to enable high-resolution fluorescence imaging deeper inside biological samples with intrinsic optical sectioning and reduced out-of-focus excitation.
Laser 2000 helps researchers, imaging platform developers and OEMs select and combine the photonics technologies needed to build and optimise advanced multiphoton imaging systems.
How Deep Do You Need to See?
Choosing Between 2P and 3P Microscopy
The right approach depends on the imaging depth, sample, fluorophores, required acquisition speed and experimental objective.
Two-Photon Microscopy
Two-photon excitation is widely used for high-resolution fluorescence imaging in biological tissue. Ultrafast excitation confines fluorescence primarily to the focal region, supporting optical sectioning while reducing out-of-focus photobleaching and photodamage.
Three-Photon Microscopy
For greater imaging depths and strongly scattering tissue, three-photon excitation can extend the accessible imaging range. It places higher demands on the laser source, pulse characteristics, wavelength, optics and overall system design.
The question is not simply 2P or 3P—it is which combination delivers the information your experiment requires.
The Laser Source Is Critical
Match the Excitation to the Application
Laser selection is one of the key factors determining multiphoton imaging performance.
The optimal source depends on the fluorophore, excitation wavelength, pulse duration, repetition rate, pulse energy, tuning requirements and desired imaging depth.
Depending on the application, technologies can include Ti:Sapphire lasers, ultrafast fiber lasers and OPA/OPO-based sources, while CW lasers can support alignment and complementary imaging functions.
Our Photonics Advisors can help evaluate the source in the context of the complete imaging system rather than as an isolated component.
More Than the Laser
Optimise the Complete Optical Chain
A powerful excitation source alone does not guarantee a good image. Signal generation, collection efficiency and detection all influence the information that ultimately reaches the imaging system.
Excitation & Beam Delivery
Control and deliver ultrafast pulses efficiently to the sample while maintaining the required beam characteristics.
Optics
Select optical components suited to the wavelength range and nonlinear imaging process while minimising losses throughout the system.
Scanning
Balance field of view, acquisition speed and resolution for the required imaging task.
Detection & Signal Collection
Maximise collection efficiency to capture weak fluorescence signals, particularly in demanding deep-tissue applications.
Optical Characterization
Measure and verify laser and optical performance during development, alignment and system optimisation.
What Does Your Imaging Application Require?
Rather than starting with a particular laser or component, we look at the parameters that determine the complete imaging result:
Imaging Depth
How far into the sample does useful information need to be recovered?
Excitation Wavelength
Which wavelength range matches the fluorophores and imaging objective?
Pulse Characteristics
What pulse duration, energy and repetition rate are required?
Imaging Speed
How quickly must individual images or complete volumes be acquired?
Signal Collection
How efficiently can fluorescence be collected and detected?
Sample Viability
How can the required information be obtained while limiting phototoxicity and photobleaching?
Typical Applications
Neuroscience
Deep-tissue imaging and investigation of neuronal structures and activity.
Developmental Biology
High-resolution imaging of biological structures and processes in intact samples.
Live-Tissue Imaging
Observation of dynamic biological processes while reducing unnecessary out-of-focus excitation.
Advanced Fluorescence Microscopy
Multiphoton excitation for demanding fluorescence imaging and research applications.
OEM Imaging Platforms
Integration of multiphoton technologies into specialised scientific and biomedical imaging systems.
From Individual Components to Imaging Architecture
Multiphoton microscopy is a system challenge. The laser source, beam delivery, optics, scanning and detection need to work together to achieve the required imaging depth, speed and signal quality.
With expertise across the photonics chain and access to specialised technology manufacturers, Laser 2000 can support projects from technology selection and system architecture through to integration and optimisation.
This helps reduce development complexity, identify critical components earlier and accelerate the path from experimental concept to a reliable imaging platform.
Explore Other Laser Applications
Holographic Imaging
Capture three-dimensional information through coherent laser illumination.
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Frequently Asked Questions
Should I choose two-photon or three-photon microscopy?
The right choice depends on the required imaging depth, sample scattering properties, fluorophores and acquisition speed. Three-photon excitation can reach deeper into strongly scattering tissue but places higher demands on the laser source and system design. Our experts help evaluate which approach fits your experiment.
Which laser technologies are used for multiphoton microscopy?
Depending on the application, technologies can include Ti:Sapphire lasers, ultrafast fiber lasers and OPA/OPO-based sources, while CW lasers can support alignment and complementary imaging functions.
Does Laser 2000 support the complete imaging system, not just the laser?
Yes. Excitation and beam delivery, optics, scanning, detection and optical characterization all influence imaging performance, and we help evaluate the laser source in the context of the complete system.
Building a 2P or 3P Imaging System?
Tell us what you need to image, how deep you need to see and which fluorophores or wavelengths you are working with.
Our Photonics Advisors can help identify the right excitation, optics, beam delivery and detection technologies for your application.