Laser pulse compressor and phase-compensator described

In the development of nonlinear phase conjugate optics, a number of phase conjugate cavity and phase conjugate mirrors have been proposed for the phase anomaly in the laser amplifier. A composite laser system with a stimulated Brillouin scattering (SBS) conjugate mirror was studied and 200 mJ of output was obtained using a polarization isolation technique. Pulse compression was observed using the usual capillary Brillouin cell and using a ruby laser as a pump. Higher order pulse compression was achieved with a long conical capillary Brillouin cell. In this work, the composite laser system and the conical capillary Brillouin scattering conjugate mirror were combined. Using a polarization isolation method, the compressed laser pulse is completely coupled out. Using a 670 mm tapered capillary Brillouin cell containing CS2 liquid, the pulse width of the Q-switched Nd:YAG laser amplifier in the composite system is compressed by a factor of 3. The laser pulse energy is more than 240 mJ. The degree of compression depends on the length of the capillary; by changing the length of the Brillouin cell, it is possible that a variable pulse width laser can be made.