A high brightness, high energy passively Q-switched (PQS) Nd:YAG laser is presented using volume transmitting Bragg gratings (TBGs) as angular filters. A planar cavity with a length of 1 cm, an 800 μm diameter pump beam, a 20% transmission Cr:YAG saturable absorber, and a 40% output coupling resulted in output pulse energies greater than 1 mJ and durations near 600 ps. In order to increase brightness without altering cavity length, a TBG with narrow angular selectivity placed in the cavity to suppress the higher order transverse modes allowing for near diffraction limited output.
Evan R. Hale, Ivan Divliansky, and Leonid Glebov, "High brightness, sub-nanosecond, and compact passively Q-switched laser with intracavity volume Bragg gratings," Proc. SPIE 10637, Laser Technology for Defense and Security XIV, 1063711 (Presented at SPIE Defense + Security: April 19, 2018; Published: 4 May 2018); https://doi.org/10.1117/12.2307204.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon