Abstract

In the last several years, we have used an external resonating cavity with these two harmonic generation crystals arranged in tandem to generate the fourth harmonic radiation inside the cavity. When the external cavity length is an exact multiple of the trapped (resonating) wavelength which is the second harmonic at 532 nm, the electromagnetic field of the trapped radiation interfere constructively and therefore the energy conversion efficiency to the fourth harmonic is substantially increased.¹⁻³ Earlier we have reported production of 1.7 W at 266 nm using this scheme.⁴ Now, over 2.1 W at 266 nm is obtained using the same scheme.

© 2002 Optical Society of America