Rodent Optogenetics Laser Stimulation
Adjustable power laser system providing 473nm, 532nm, and 593nm wavelengths for optogenetic stimulation of light-sensitive proteins in rodent neural circuits.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The Rodent Optogenetics Laser Stimulation system provides precise wavelength-specific illumination for optogenetic manipulation of neural circuits in rodent models. This compact laser platform delivers blue (473nm), green (532nm), and yellow (593nm) light through fiber optic connections, enabling researchers to control genetically modified neurons expressing channelrhodopsins, halorhodopsins, or other light-sensitive proteins.
The system features adjustable power output ranging from 0-50mW to 0-200mW across different configurations, with power stability options of <1% to 10,000 hour operational lifetime and portable form factor make it suitable for both acute and chronic optogenetic experiments.
How It Works
Optogenetic stimulation relies on the expression of light-sensitive proteins (opsins) in specific neuronal populations through viral delivery or transgenic approaches. These proteins undergo conformational changes when exposed to specific wavelengths of light, leading to ion channel opening or closing and subsequent neuronal activation or inhibition. Blue light (473nm) typically activates channelrhodopsin variants for neuronal excitation, while yellow light (593nm) activates halorhodopsin or archaerhodopsin for inhibition.
The laser system generates coherent, monochromatic light at precise wavelengths that can be efficiently coupled into optical fibers for delivery to target brain regions. The coherent nature of laser light allows for minimal power loss during fiber transmission, ensuring consistent illumination at the fiber tip. Power stability control maintains consistent photon flux delivery, critical for reproducible optogenetic responses across experimental sessions.
External waveform generator connectivity enables complex stimulation patterns including pulsed protocols, ramp stimulation, or closed-loop feedback paradigms. The adjustable power output accommodates different opsin sensitivities and tissue penetration requirements, while FC-PC connectors provide stable optical coupling with minimal back-reflection.
Features & Benefits
wavelengths
- Blue Light 473nm, Green Light 532nm, Yellow Light 593nm
output_power_range
- 0-50mW, 0-100mW and 0-200mW, adjustable
stability
- <5%, <1%, and many other different stabilities
connector_type
- FC-PC connectors
life_expectancy
- more than 10 thousand hours
power_variation
- less than 2%
form_factor
- compact size, portable
waveform_control
- Connect the waveform generator or stimulator to control the light output
fiber_compatibility
- Connect a variety of fibers
safety_requirement
- To be used in conjunction with laser goggles
Color
- 473nm Blu-ray Laser
- 532nm Green Laser-50mW
- 593nm Yellow Laser-50mW
Automation Level
- semi-automated
Research Domain
- Addiction Research
- Anxiety and Depression
- Behavioral Pharmacology
- Learning and Memory
- Motor Function
- Neuroscience
- Pain Research
- Social Behavior
Species
- Mouse
- Rat
Weight
- 6.06 kg
Dimensions
- L: 65.0 mm
- W: 36.0 mm
- H: 27.0 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Wavelength Options | Blue 473nm, Green 532nm, Yellow 593nm | Single wavelength systems common in entry-level models | Enables bidirectional neural control and compatibility with multiple opsin types within one system |
| Power Output Range | 0-50mW to 0-200mW adjustable configurations | Fixed power outputs or limited adjustment range | Accommodates diverse experimental requirements from low-power chronic studies to high-power acute applications |
| Power Stability | <1% to <5% selectable stability options | Higher power fluctuations in basic models | Ensures reproducible optogenetic responses critical for quantitative behavioral measurements |
| Control Interface | External waveform generator and stimulator compatibility | Basic on/off control or limited pattern options | Enables complex temporal protocols and integration with existing electrophysiology systems |
| Operational Lifetime | More than 10,000 hours | Shorter lifetimes in lower-cost alternatives | Reduces equipment replacement frequency and provides reliable performance for long-term studies |
| Form Factor | Compact, portable design | Larger bench-top units common in high-power systems | Facilitates integration into behavioral testing setups and enables use across multiple experimental locations |
This laser system combines multi-wavelength capability, adjustable power output, and precise stability control in a compact platform optimized for rodent optogenetics research. The external control compatibility and extended operational lifetime provide experimental flexibility and long-term reliability.
Practical Tips
Calibrate power output at the fiber tip rather than at the laser output, as coupling efficiency can vary between fiber connections.
Why: Ensures accurate irradiance delivery to tissue and accounts for connector losses.
Clean FC-PC connectors with appropriate optical cleaning tools and inspect for damage before each experimental session.
Why: Maintains optimal coupling efficiency and prevents power loss or beam distortion.
Allow 15-20 minute warm-up period before beginning experiments to achieve specified power stability.
Why: Laser output power and wavelength stabilize with temperature, affecting experimental reproducibility.
Always verify laser safety goggles match the specific wavelength being used and ensure they are easily accessible during operation.
Why: Different wavelengths require different optical density specifications for adequate eye protection.
If power output appears unstable, check fiber connector cleanliness and ensure adequate ventilation around the laser unit.
Why: Contaminated connectors or thermal drift can cause power fluctuations affecting experimental results.
Monitor and record actual power output at the start of each experimental session for data analysis purposes.
Why: Power variations between sessions can affect optogenetic response magnitude and experimental interpretation.
Use the minimum effective power density to achieve desired behavioral response to minimize tissue heating and photodamage.
Why: Excessive light exposure can cause tissue damage and alter neuronal function beyond optogenetic effects.
Store fiber optics in protective sleeves and avoid tight bending radii that can cause core damage or light loss.
Why: Proper fiber handling maintains light transmission quality and extends fiber operational lifetime.
Setup Guide
What’s in the Box
- Laser stimulation unit (typical)
- Power supply and cables (typical)
- FC-PC connector interface (typical)
- User manual and safety guidelines (typical)
- Wavelength specifications certificate (typical)
Warranty
ConductScience provides a standard 1-year manufacturer warranty covering defects in materials and workmanship, with technical support for setup and operational guidance.
Compliance
What power density should I use for channelrhodopsin activation in vivo?
Power requirements vary by opsin variant and tissue depth. Start with 1-5 mW/mm² at the fiber tip for ChR2, adjusting based on behavioral response and minimizing tissue heating. Consult your opsin datasheet for specific irradiance recommendations.
Can this system deliver pulsed stimulation protocols?
Yes, through external waveform generator connectivity. The system responds to TTL or analog control signals, enabling complex temporal patterns including pulsed trains, ramps, or closed-loop paradigms.
What fiber diameter and numerical aperture work best with this system?
The FC-PC connector accommodates standard research fibers. For in vivo applications, 200-400 μm core diameter fibers with 0.22-0.39 NA provide good balance between light delivery and tissue damage minimization.
How do I maintain power stability across long experimental sessions?
Allow 15-20 minutes warm-up time and select appropriate stability specification (<1% for critical applications). Monitor power output periodically and ensure adequate ventilation around the laser unit.
Can I use this system for simultaneous multi-site stimulation?
Single-wavelength output requires fiber splitters for multi-site delivery, though this reduces power at each site. Consider power budget and splitting ratio when designing multi-site protocols.
What safety precautions are required during operation?
Wavelength-specific laser safety goggles must be worn during operation. Ensure proper beam containment and avoid direct viewing of fiber output. Follow institutional laser safety protocols.
How does this compare to LED-based optogenetic systems?
Laser systems provide higher power density and better fiber coupling efficiency compared to LEDs, enabling deeper tissue penetration and more precise spatial control, though at higher cost.
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