DETERMINATION OF THE ENERGY OF A PULSED LASER BEAM BY TRANSFER OF THE PHOTON MOMENTUM TO A BALLISTIC TORSIONAL PENDULUM
NAVAL ORDNANCE LAB WHITE OAK MD
Pagination or Media Count:
An instrument has been designed and constructed which is capable of measuring high energies of pulsed laser beams, without seriously interfering with their simultaneous use in an experiment. Transfer of the photon momentum of the beam to angular momentum of a doubly-reflecting ballistic torsional pendulum was the principle by which photon momentum effects were successfully measured. The instrument operates at 10 to the minus 5 power mm of Hg with a sensitivity of 2.55 plus or minus 0.04 cmjoule, and does not require damping of the initial oscillations before making a measurement. In addition to providing the capability of simultaneous energy measurement and use of a laser beam, the measurements made with this instrument appear to be more accurate than those made with a commercial calorimeter used for comparison.
- Test Facilities, Equipment and Methods