Generation of quasi-continuous-wave vacuumultraviolet coherent light by fourth-harmonic of a Ti:sapphire laser with KBBF crystal

Abstract

We report the generation of quasi-continuous-wave vacuum-ultraviolet (VUV) coherent light based on a Ti:sapphire laser with two successive frequency doubling stages. In the first stage, UV light at 399 nm with power of 1.1 W was obtained by exploiting an enhanced cavity. With a KBBF crystal as nonlinear material, quasi-continuous-wave VUV coherent light with power of about 25 mW at 199.5 nm and 4.7 mW at 193.5 nm were achieved through a single-pass SHG configuration, respectively, in the second stage.

A picosecond widely tunable deep-ultraviolet laser for angle-resolved photoemission spectroscopy

“…In the experiment, the FHG conversion efficiency at 193 nm is about 0.34%, which is lower than the reported results. [20][21][22][23] The lower SH peak power density and thinner KBBF crystal are the main reasons for the low FHG conversion efficiency. Therefore, the FHG conversion efficiency can be enhanced by increasing the SH power density through reducing the radius of SH beam in KBBF crystal and adopting the thicker KBBF crystal.…”

Deep‐Ultraviolet Biomolecular Imaging and Analysis

“…A variety of nonlinear crystals are studied for emitting DUV light efficiently at different wavelengths. They include cesium lithium borate, cesium borate, potassium beryllium fluoroborate, rubidium beryllium fluoroborate, yttrium aluminum borate, barium aluminum borate difluoride, and alkali‐metal/alkaline‐earth‐metal fluorine berylliumborate . They have different properties (e.g., damage thresholds, wavelength conversion efficiencies, and acceptance angles) for generating DUV light via the nonlinear optical effect.…”

Laser-induced behavior of BK7 mirror in a compound resonator on watt level DUV laser

“…Lots of solid-state lasers have been presented by the fourth-harmonic generation (FHG) of the wavelength around 1 μm for achievement of DUV power. For the design of a frequency doubler, many nonlinear optical (NLO) crystals have been applied in the experimental studies (Lin et al 2012;Bhandari et al 2012;Zhang et al 2009;Gün et al 2011), including β -BaB 2 O 4 (BBO), CsLiB 6 O 10 (CLBO) and KBeBO 3 F 2 (KBBF). Yet more than 20 W 266 nm DUV power at high-repetition-rate was obtained by a CLBO crystal since 2000 (Kojima et al 2000;Sakuma et al 2004;Wang et al 2006).…”

“…In particular, KBBF has the better optical performances on the cut-off wavelength. The vacuum ultraviolet (VUV) light as short as 165 nm was predicted to be generated through direct second harmonic generation (SHG) by using KBBF (Zhang et al 2009;Chen et al 2008). On the contrary, CLBO is constrained in commercial high power UV lasers due to its highly hygroscopic performance and the layer-structure of KBBF makes it difficult to grow KBBF larger than several millimeters.…”