What Types of lasers would travel farthest in water?
What Types of lasers would travel farthest in water?
(OP)
I have a science project on lasers and i need to do two things, 1) find three lasers, each different wavelengths, and 2) test them in a scientific method and also create a Hypothesis. I am looking for any guidance as to where i can find verifyed research on the subject and if any one knows, where to buy lasers. By the way, i am not posting HW.





RE: What Types of lasers would travel farthest in water?
RE: What Types of lasers would travel farthest in water?
Lasers are used in combination with water for industrial metal cutting eg Hybrid Laser/Water Jet, but info on beam travel through water unless coupled with fibre optics will be difficult to find.
Laser manufacturers include: Rofin Sinar, Trumph, Fanuc, PRC, Convergent, Prima, Panasonic, Mitsubishi and Wegmann Baasel.
References can be sought through the Laser Institute of America www.laserinstitute.org
TJA
RE: What Types of lasers would travel farthest in water?
RE: What Types of lasers would travel farthest in water?
Just a guess, but I seem to remember reading somewhere that the US Navy has the ability to communicate with submerged submarines through Ultra Low Frequency (ULF). The lower the frequency the better the signal transmits through the water. Using this assumption the lower wavelength lasers would probably work the best.
Rich...
Richard Nornhold, PE
nornrich@redrose.net
RE: What Types of lasers would travel farthest in water?
You do realise that you are extrapolating a trend across wavelengths by a factor of 10^9 or more?
Cheers
Greg Locock
RE: What Types of lasers would travel farthest in water?
So, Greg, Rich is right about lower wavelength but got there by faulty logic -- frequency is inversely proportional to wavelength: f = c/λ.
Of the lasers in ‘Characteristics of Laser Sources’ in CRC Handbook of Chemistry and Physics, 79th Edn., the 10 best for penetrating water are
1. Argon (Ar2), ~125 nm wavelength (UV),
2. Krypton (Kr2), ~145 nm,
3. Fluoride (F2), ~155 nm,
4. Hydrogen (H2), ~165 nm,
5. Xenon (Xe2), ~175 nm,
6. Argon-chloride (ArCl), ~180 nm,
7. Argon-fluoride (ArF), ~195 nm,
8. Krypton-chloride (KrCl), ~220 nm,
9. Krypton-fluoride (KrF), 249 nm,
10. Chloride (Cl2), ~255 nm.
Also, 2 common types of possible interest:
Nitrogen ion (N2+), 420 nm (violet),
Argon ion (Ar+), 488 nm (blue-green).
Hope this helps,
Ken
RE: What Types of lasers would travel farthest in water?
The exact opposite of what Richard said!
Cheers
Greg Locock
RE: What Types of lasers would travel farthest in water?
wow
RE: What Types of lasers would travel farthest in water?
Actually I just reread Rich's post. The confusion comes about because he wrote
" The lower the frequency the better the signal transmits through the water. Using this assumption the lower wavelength lasers would probably work the best."
Lower wavelength does not imply lower frequency, rather the reverse.
Cheers
Greg Locock
RE: What Types of lasers would travel farthest in water?
RE: What Types of lasers would travel farthest in water?
RE: What Types of lasers would travel farthest in water?
Have worked on thses types of prjocts before. In reality onlly goos in the deep blue, close to shore, this light is a plantin magnets, which in turn call the food chain to attention