High repetition frequency flashlamp for thin Nd:YAG or Er:YAG laser rods, new

Description

Classical (years 80'), high repetition frequency, pulsed xenon flashlamp to pump thin (3 - 5 mm dia.) Nd:YAG or Er:YAG laser rods, type INP-3/75A from Russian Federation. New, never used, from original package opened to take the picture (see last picture). Plasma discharge size: 3 mm dia. x 75 mm length, ideally should match the laser rod size. Appropriate for rods with 65 mm - 85 mm in length. Outer diameter of lamp 6.3 mm. Total lamp length (with electrodes) 165 mm. The following nominal parameters are from the original datasheet of the lamp, for a lifetime of minimum 10
5
pulses: discharge energy 20 J; nominal working voltage 700 V - 1150 V; pulse duration (at 35 % of peak) 90 - 120 microseconds; max. repetition frequency 50 Hz; max. average electrical power 1.5 kW; peak trigger voltage 20 kV - 24 kV (measured on 100 kiloohm load), or greater than 8 kV (measured on 10 kiloohm load); min. trigger pulse duration (at 10 % of peak) 1 microsecond. Recommended trigger system -external, i.e., thin (0.3 mm - 0.5 mm) Ni wire wrapped on the outside flashtube. Although there is no polarity sign on the lamp, the electrodes look different. Usually the cathode (negative electrode) is the thinner one (picture #3). Breakdown (self-igniting) voltage min. 2.25 kV. Recommended coolant: distilled water, min. flow rate 7 liters per minute. Recommended coolant temperature 25 +/- 10 degrees Celsius. Needs a cooling jacket of 13 mm - 14 mm inner diameter. Critically damped RLC discharge circuit desirable. Example of good operating regime: pulse energy 20 J, with 40 microfarad, 1000 V storage capacitor; coil inductance 30 - 35 microhenry; pulse duration (at 1/3 of maximum) cca. 100 microseconds. For other designs of the discharge circuit, please inspire yourself from the Catalogue Verre et Quartz, at: flashlamps-vq.com/CatalogueVQF.pdf, and from the course "Flashlamps power supplies and triggering" at http://pe2bz.philpem.me.uk/Lights/-%20Laser/Info-902-LaserCourse/c04-04/mod04_04.htm. For laser professionals or for laser hobbyists. Also as laser history collectible item.