Cw mode-locked deep UV pulses at an average power of 1.8 W

Garcı́a, Javier; Newman, Andrew; Liu, J M; Lee, Meng-Chieh

doi:10.1088/1464-4258/2/6/101

Cited by 4 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[38] The output of the 532 nm laser was focussed into the 7-mm-long BBO crystal cut for type I second-harmonic generation (SHG) using a 70-mm lens. The resulting DUV along with the residual 532-nm light were collimated with a 70-mm lens and then separated using a Pellin-Broca prism.…”

Section: Raman Measurement Systemmentioning

confidence: 99%

Deep‐UV tip‐enhanced Raman scattering

Taguchi

Hayazawa

Furusawa

et al. 2009

J Raman Spectroscopy

163

126

View full text Add to dashboard Cite

We report for the first time the tip-enhancement of resonance Raman scattering using deep ultraviolet (DUV) excitation wavelength. The tip-enhancement was successfully demonstrated with an aluminum-coated silicon tip that acts as a plasmonic material in DUV wavelengths. Both the crystal violet and adenine molecules, which were used as test samples, show electronic resonance at the 266-nm excitation used in the experiments. With results demonstrated here, molecular analysis and imaging with nanoscale spatial resolution in DUV resonance Raman spectroscopy can be realized using the tip-enhancement effect.

show abstract

Section: Raman Measurement Systemmentioning

confidence: 99%

Deep‐UV tip‐enhanced Raman scattering

Taguchi

Hayazawa

Furusawa

et al. 2009

J Raman Spectroscopy

163

126

View full text Add to dashboard Cite

show abstract

“…Harmonic frequency generation is a well-known technique for creating continuous-wave as well as pulsed light in the green and ultra-violet wavelengths. However, quadrupling of mode-locked pulses has been rare [3]. Recently, some commercial systems have become available, but their pulse widths are relatively long and their pulse energies are relatively low [4].…”

Section: Introductionmentioning

confidence: 99%

Green and ultraviolet pulse generation with a compact, fiber laser, chirped-pulse amplification system for aerosol fluorescence measurements

Lou

Currie

Sivaprakasam

et al. 2010

Review of Scientific Instruments

View full text Add to dashboard Cite

We use a compact chirped-pulse amplified system to harmonically generate ultrashort pulses for aerosol fluorescence measurements. The seed laser is a compact, all-normal dispersion, mode-locked Yb-doped fiber laser with a 1050 nm center wavelength operating at 41 MHz. Average powers of more than 1.2 W at 525 nm and 350 mW at 262 nm are generated with <500 fs pulse durations. The pulses are time-stretched with high-dispersion fiber, amplified by a high-power, large-mode-area fiber amplifier, and recompressed using a chirped volume holographic Bragg grating. The resulting high-peak-power pulses allow for highly efficient harmonic generation. We also demonstrate for the first time to our knowledge, the use of a mode-locked ultraviolet source to excite individual biological particles and other calibration particles in an inlet air flow as they pass through an optical chamber. The repetition rate is ideal for biofluorescence measurements as it allows faster sampling rates as well as the higher peak powers as compared to previously demonstrated Q-switched systems while maintaining a pulse period that is longer than the typical fluorescence lifetimes. Thus, the fluorescence excitation can be considered to be quasicontinuous and requires no external synchronization and triggering.

show abstract