About Blog

Ophir’s Photonics group manufactures, calibrates and sells a complete line of accurate NIST compliant instruments for analyzing and measuring laser power, energy, position, size and beam profile (Spiricon LLC & Photon brands), which are used in industrial, medical and scientific research.
Ophir Photonics group is part of MKS Instruments, Inc., a global provider of technologies that enable advanced processes and improve productivity.

Recent Posts

- OPHIR’S 2018 CATALOG IS HERE!
- THANK YOU FOR VISITING US AT THE 2018 Photonics west Trade show!
- MKS Announces Ophir® Centauri, Compact Touch-Screen Laser Power/Energy Meter
- This is why you need to Visit Ophir Next Week at Photonics West 2018
- 4 ways Ophir’s “LP2” laser sensors can help you beat measurement challenges

Recent Comments

- OS Installations-Operating System installation for you Laptops and Desktops on Laser measurement software from Ophir® can now measure laser power from anywhere! – Part 2
- OphirBlog on Measuring the Power of a Pulsed Laser Beam
- Mary on Measuring the Power of a Pulsed Laser Beam
- DeepStream on Ophir® is proud to share the MKS Semiconductor Devices and Process Technology handbook!
- faux bague de cartier on The Truth about Laser Beam Profilers: Camera vs. Scanning Slit

Sorry Yogesh, I’m not familiar with sonication technology, this post is about the power density of lasers. Did you check this site: http://www.sonicator.com/literature/faq.shtml#powerintensity? It seems more relevant to your question.

Good luck!

how to change power intensity and power density in ultrasonic sonicator.. and what is the formula to find it out ..

hi,

what would be the formula to calculate the powerd density from a laser beam,if we also want to take into account the objective (40x) and magnification (1.6x)?

I assume we are talking about using a micro objective to focus a laser beam. Calculating the power density at the focal spot is possible, but there is not a simple formula for it. You need to know the beam size as it enters the objective and the focal length of the objective. From these you can calculate the divergence (actually convergence) angle by common trigonometry. If the beam is Gaussian then the formulas relating beam size at the waist and divergence angle are given in the article:

http://bit.ly/1792lsX

In the copclimated world we live in, it’s good to find simple solutions.

Reference to your article “A Shorcut for Calculating Power Density of a laser beam”. The fromula derivation may not be completely correct. When you solve for PowerDensity = Power(W) / πr2 = Power / π(0.5mm)2 ≈ 127 x Power (W/cm2); the answer should 1.27 x Power (W/cm2) unless I am missing something. Thanks

Hi Ritchie,

Thanks for your comment. You’re correct that 1/(π*.5^2) = 4/π, or about 1.27. What you might not have noticed is that we are also converting mm^-2 to cm^-2, so we need to add two orders of magnitude. Thanks for pointing this out, as it may have been unclear to others as well.