I have already discussed the construction and working of dye laser. Let us discuss the output and applications of dye lasers.
Output: The dye laser provides 3nsec pulses in the spectral range of 360 nm to 950 nm. The typical peak powers are on the order of about 10kW to 20kW. Dye lasers can be operated in both pulsed and continue wave (CW) modes. If a flash lamp is used to pump the dye laser, the output will be pulsed one whereas if the laser is pumped by a continuous wave laser like argon-ion laser, the dye laser will also be continuous. Continue reading “Ouput and applications of dye laser”
Last time I have discussed the construction of dye lasers. Let us discuss the working of dye laser:
The molecules have singlet as well as triplet states. Each electronic state comprises of several vibrational states and each vibrational state comprises of several rotational levels.
Due to absorption of light from pumping source, dye molecules get excited from the ground state E1 to upper vibrational rotational levels of excited state E2 which is upper laser level. Most of the dye molecules decay to the lowest vibrational level L of E2 in a time of about 10-11 seconds. This process is due to thermal redistribution in level E2, thus, it is a non-radiative process. Population inversion is achieved at level L. Continue reading “Working of dye laser”