Tunable kHz Deep Ultraviolet (193–210 nm) Laser for Raman Applications

Abstract

The performance characteristics of a kilohertz solid-state laser source for ultraviolet Raman spectroscopy are described. Deep ultraviolet (UV) excitation in the 193-210 nm region is provided by mixing of the fundamental and third harmonics of a Ti-sapphire laser, which is pumped by the second harmonic of a Q-Switched Nd-YLF laser. The combination of tunability, narrow linewidth, high average power, good stability, and kilohertz repetition rate makes this laser suitable for deep UV resonance Raman applications. The short pulse duration (approximately 20 ns) permits nanosecond time resolution in pump-probe applications. The low peak power and high data rate provide artifact-free spectra with a high signal-to-noise ratio. UV Raman cross-section and Raman excitation profiles are reported for gaseous O2 (relative to N), aqueous ClO4-, tyrosine, phenylalanine, tryptophan, histidine, and hemoglobin excited between 193 nm and 210 nm to illustrate laser performance.

Simultaneous Observation of Peptide Backbone Lipid Solvation and α‐Helical Structure by Deep‐UV Resonance Raman Spectroscopy

“…[15] Spectral calibration was done by cyclohexane spectra correction. [16] All data were processed in a MATLAB environment to remove interferences from gamma rays and contributions from buffer.…”

Adventures in Bioinorganic Chemistry

“…The lasers are stable and operate at 1 kHz repetition rates, producing spectra of superior quality. 124 We were able to sharpen the structural interpretation of the Hb time course, and found an important new intermediate on the pathway. 125 We examined site-directed mutants designed to test our pathway model, and came up with exciting new results, implicating dynamic cooperativity at the level of subunit dimers within the tetrameric structure.…”

Borate-Based Ultraviolet and Deep-Ultraviolet Nonlinear Optical Crystals

“…However, there exist some borates in which other types of microscopic groups also make considerable contributions to the NLO effect apart from the B-O groups. In this section, we select Ba 3 10 Cl, with one of the four coordinated boron substituted by zinc atoms. By sharing the corner oxygen atoms, the (ZnB 5 O 13 ) 3− groups are interconnected with each other to form the 3D framework (Figure 17).…”

“…Without exception, nonlinear optical (NLO) crystals, one of the most important optoelectronic functional material types, are now widely used in laser wavelength-converting technology [2][3][4][5][6][7]. In particular, the NLO crystals are vital to the generation of coherent light in the ultraviolet (UV, λ < 400 nm) and deep-ultraviolet region (DUV, λ < 200 nm) regions by all-solid-state lasers, owing to its great application in many scientific and engineering fields such as semiconductor photolithography, micromachining and ultraprecise photoelectron spectrometry [8][9][10][11]. Therefore, the exploration of NLO crystals in UV and DUV regions has been one of the research hotspots in the field of optoelectronic functional materials for decades.…”