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Posted: **Fri May 06, 2022 6:34 am**

: C A He Ne Laser With A Resonator Length Of 30 Cm Is Oscillating In 3 Longitudinal Modes Calculate Its Coherence Lengt 1 (41.95 KiB) Viewed 23 times

(c) A He-Ne laser with a resonator length of 30 cm is oscillating in 3 longitudinal modes. Calculate its coherence length and compare with that expected from a laser diode. How is coherence measured?. [5 marks]