Question
A He-Ne c-w laser has a Doppler-broadened transition bandwidth of about $1.4 \mathrm{GHz}$ at $632.8 \mathrm{nm}$. Assuming $n=1.0$, deter- mine the maximum cavity length for single-axial mode operation. Make a sketch of the transition linewidth and the corresponding cavity modes.
Step 1
4 \, \text{GHz} = 1.4 \times 10^9 \, \text{Hz}$ and the wavelength $\lambda = 632.8 \, \text{nm}$. The index of refraction is assumed to be $n = 1.0$. Show more…
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Calculate the number of modes that can be sustained by the cavity of a He-Ne laser, knowing that the cavity length is 30 cm, and that the laser emits a line with an average wavelength of 632.801 nm and bandwidth 2 × 10^(-3) nm.
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