A Ti-doped sapphire laser emits at 800 nm and is mode-locked. It consists of a Ti-sapphire...

A Ti-doped sapphire laser emits at 800 nm and is mode-locked. It consists of a Ti-sapphire rod with refractive index 1.4 that is 10 cm long within a cavity that is 2 m in length (the laser pulses propagate in air except when passing through the rod). You can neglect the reflectivity of the rod surfaces, assuming they are coated with perfect anti-reflective coatings. The spectral width of the laser is 200 THz. What is the resulting pulse width, pulse repetition rate and spatial separation of the output pulses? How many cavity modes are contributing to the output pulses? Considering the pulse width achieved, comment on what strategy you think might be appropriate to achieve mode locking: would this be a passive or active mechanism? Explain the reasoning behind your answer

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genius_generous answered 2 years ago

4.22 mode-locked laser (a)consider a He-Ne laser emitting at 632.8nm, and mode-locked. the tube length is...

4.22 mode-locked laser (a)consider a He-Ne laser emitting at 632.8nm, and mode-locked. the tube length is 50cm. the spectral with of the optical gain curve is 1.5 GHz Find the mode-locked pulse width and the repetition rate. what is the seperation of pulses in space? (b) consider a Nd^3+ glass laser that is mode-locked. The emission wavelength is 1060 nm and the spectral width of the optical gain curve is 7THz. the refractive index of the laser medium is 1.45....

A laser emits two wavelengths (λ1 = 420 nm; λ2 = 630 nm). When these two...

A laser emits two wavelengths (λ1 = 420 nm; λ2 = 630 nm). When these two wavelengths strike a grating with 450 lines/mm, they produce maxima (in different orders) that coincide. What is the order (m) of each of the two overlapping lines? At what angle does this overlap occur?

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A helium neon laser emits red light of wavelength 632.8 nm, which is obtained when neon...

A helium neon laser emits red light of wavelength 632.8 nm, which is obtained when neon atoms move from level 5s to level 3p. Given is a tube that contains 0.25 moles of a helium-neon mix, of which 15% are neon atoms. Also given is that while the laser is active, around 2% of the neon atoms are located at one of the two given energy levels at any time. a) what is the difference in energy between levels 5s...

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