EINSTEIN GAVE AN ACCOUNT OF STIMULATED EMISSION OF RADIATION. Laser was also called as optical laserIN 1953 MASER WAS INVETED. 1955 Dr.Theodre Maiman devised a working model for production of Laser from Ruby crystal. In 1960 Bennet, Javan & Herriott discovered He-Ne laser.
In 1962 White & Ridgen produced visible red Laser with wavelength 632.8nm. In 1964 Flock & Zueng for the first time used Laser for surgery. There after the interest in Laser increased and possible applications in different fields were determined
Gordon Gould, he used acronym for the first time in his PhD thesis in 1959
Military application , laser EMW can be in the range of gamma, x ray,uv, visible, infra,micro, radio waves and henc can be called x ray laser, gamma laser etc
This is electromagnetic spectrum, to your left is wavelength and to your right is frequency
Warning symbol for lasers
SARDARJI SUFFERS FROM SERIOUS FINANCIAL CRISES, HE HAD TWO OPTIONS EITHER TO LOOT BANK OR TO KIDNAP. HE OPTS FOR SECOND. HE KIDNAPS ONE CHILD, TAKE THE CHILD TO REMOTE PLACE AND WROTE ON A PAPER A MATTER FOR CHILD FATHER THAT HE SHOULD PAY A RNASOM OF 20 LACKS AT A PLACE MENTIONED BY HIMOTHERWISE HE WILL KILL HIS CHILD, SIGNS IT AS ONE SARDARJI TUCK IT ON BACK OF CHILD AND SENDS HIM TO HIS FATHER.AT SPECIFIED LOCATION THEN HE FINDS CHILD WITH 20 LACKS IN HIS HAND MEANT FOR HIM WITH A NOTE, IN WHICH IT WAS WRITTEN THAT DON’T A FEEL ASHAMED OF YOURSELF WHILE CHEATINNG OTHER SARDAR WITH A SIGN SECOND SARDARJI
Star fire by NASA
One student attaches a 100 rupee note to ans book & write Rs 1 rupee per mark. Prof Sardarji corrects the paper, takes out Rs 100, attaches 80 7 writes you scored 20, keep the change of 80
He Neon machine
Dr. Subhash Khatri
BPhT, MPT, PhD, FIAP
• Laser is an Acronym for the Light
amplification by the Stimulated
emission of Radiation.
• Therapeutic laser is also known as
Soft laser, Cold laser, Low intensity
laser, class III A B, optic laser
• Laser is a beam of light which is
used for various purposes.
1955 Dr.Theodre Maiman
1960 Bennet, Javan & Herriott
1962 White & Ridgen
1964 Flock & Zueng
Applications in different fields
Dermatology, dentistry, OBG,
optahalm, diagnosis, Physiotherapy
Helium, neon, argon, carbon
Diode Laser: like solid but
works on electron
• Class I/1: Safe, cd players.
• Class II/2: 1 mW: blink reflex of eye will
prevent damage. up to 1 mW power, for
example laser pointers.
• Class IIIa/3R: 5 mW and staring into such a
beam for several seconds is likely to cause
(minor) eye damage.
• Class IIIb/3B: immediate severe eye
damage upon exposure. Usually lasers up
to 500 mW, cd and dvd burners.
• Class IV/4:burn skin, eye and/or skin
damage. industrial and scientific lasers are
in this class.
1.Principle of production