NIR Laser Wavelengths for Deep-Tissue Imaging: 730 to 1550nm
Which NIR wavelength penetrates tissue deepest? The optical window explained — plus why 980nm reaches less far than 1064nm despite being shorter.
TTL vs. Analog Modulation: Which Do You Need?
TTL gates, analog dims — and "DC – 30 kHz" is three claims, not one. What the bandwidth buys you, what it cannot do, and why narrow linewidth lasers cannot modulate at all.
Understanding M² and Beam Quality: TEM₀₀ vs. Multimode
M² is a focusability spec, not a quality grade. What it predicts, why multimode lasers quote no M², and how much power beam quality actually costs you.
RMS Noise and Power Stability: What "< 1% RMS" Really Means
Power stability and amplitude noise are both quoted as "< 1% RMS" — but measure different things. Why bandwidth decides the number, and which one your experiment needs.
488nm vs. 473nm: Which Blue Laser for GFP?
488nm vs 473nm compared — why 488nm owns GFP, FITC, and Alexa Fluor 488, where 473nm's DPSS beam and ChR2 match win, and the modulation catch.
532nm vs. 561nm: Which Green Laser Do You Need?
532nm and 561nm compared — which excites PE, mCherry, and tdTomato best, why autofluorescence favours 561nm, and where 532nm still wins on power.
785nm Lasers for Raman Spectroscopy: Why 785 Is the Standard
Why 785nm is the default Raman excitation wavelength — balancing signal strength against fluorescence background — and what to specify when buying a Raman laser.
633nm Diode Laser: The Modern HeNe Replacement
Why 633nm diode lasers are replacing helium-neon lasers — more power, faster warm-up, direct modulation, and a smaller footprint. Plus the one spec to check first.
What Laser Do I Need for Optogenetics?
Matching laser wavelength, power, and modulation to your opsin — a practical guide to choosing the right light source for optogenetics experiments.
Laser Wavelengths for Fluorescence Microscopy
Which laser wavelength for GFP, mCherry, DAPI, and more? A complete reference matching excitation wavelengths to fluorophores for fluorescence microscopy.
How to Choose a Laser for Flow Cytometry
A practical guide to selecting flow cytometry lasers — which wavelengths for which fluorophores, what power you need, and why RMS noise matters for tight CVs.
Diode Laser vs. DPSS Laser: How to Choose
Diode lasers vs. DPSS lasers — beam quality, modulation speed, noise, size, and cost compared. A practical guide to choosing the right laser for your application.