Im looking for a compact pulsed laser with 50-150 ns long pulses and prefereably 500-1000 mJ of pulse power. All Q-switched lasers I seem to find have 5-15 ns long pulses. (wavelength is not important). A MOPA fiber laser version can get me the pulse length right but not the power...
Any suggestions?
I think it is not possible to find a commercial laser with the required characteristics at present. But in 1970-1980 a lot of rangefinders, using similar lasers were developed for military. In Sweden also. It is a laser on the base of Nd-glass with rotating prism as Q-modulator. You can expect 0.5-0.8 J, ~50 ns, ~1 Hz. So, you can try to seek just in your country.
Hi. You can use flashlamp-pumped alexandrite at 750 (720-780) nm. It is possible to generate long, high-energy pulses in the 100-ns+ range with a compact folded cavity. See for example the ref below.
A six-color four-laser mobile platform for multi-spectral fluorescence imaging endoscopy
John Black, Tyler Tate, Molly Keenan, Elizabeth Swan, Urs Utzinger, Jennifer Barton
Proceedings Volume 9304, Endoscopic Microscopy X; and Optical Techniques in Pulmonary Medicine II; 93040T (2015) https://doi.org/10.1117/12.2077999
You could also try using thulium or holmium as the gain medium at ~2 microns and q-switch. Lower gain compared to Nd, so longer pulses.
If you would really prefer 1-micron for your application then, as Dr. Tarasov suggests, you might be able to use a laser based on an Nd-silicate glass rod (not a fiber). Nd:Glass has lower gain than Nd in YAG or YAlO, etc., so gives longer pulses. It has very poor thermal properties so you have to operate at low repetition rate, but it has great storage and gives high energy pulses.
Yes, high-power Q-switched lasers with 100 ns pulses exist, but they are rare. Custom solid-state or hybrid systems may be required.
Md Shahbaz and John F Black thanks for your reply. I will use it for large area ablation, will see what we may find.
Currently, Im thinking about combineing 10-15 smaller (~200 mJ) lasers and trigger them in sequence and aim at the same place...
If you have one or two really big short pulse lasers you could also stretch the pulse width by sending the beam through a series of mirrors and optical delays. I think this used to be called an optical rattler. See https://ntrs.nasa.gov/api/citations/20020023953/downloads/20020023953.pdf
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