cse • paper_1 • waves_oscillationscse-2018-subject-02-005
He–Ne laser — UPSC CSE 2018 Physics PYQ
Buy PYQ Solution Manual →Explain the principle and working of He-Ne laser. What is the role of He gas? Why is it necessary to use narrow tube? How many longitudinal modes can be excited for an He-Ne laser in a cavity of length 30 cm and having half width of gain profile of laser material 2 \times 10^{-3}\,\mathrm{nm}? The emission wavelength is 6328\,\mathring{\mathrm{A}}.
Discussion (0)
Sign in to post a solution, derivation, or discussion.
No comments yet. Start the conversation!