Second-harmonic-generation microsystem light source at 488 nm for Raman spectroscopy

Maiwald, Martin; Jedrzejczyk, Daniel; Sahm, Alexander; Paschke, K.; Güther, R.; Erbert, G.; Tränkle, G.

doi:10.1364/ol.34.000217

Cited by 27 publications

(11 citation statements)

References 5 publications

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“…The change of the emission lines has been achieved by temperature tuning of the laser system from 30 • C to 38 • C [19]. The microsystem light source was pumped by a distributed feedback (DFB) ridge waveguide (RW) diode laser with a fundamental emission line at 976 nm, which is used to generate 488 nm light by secondharmonic generation (SHG) of the fundamental emission line [23]. To separate the fluorescence from the Raman signal, SERDS was applied.…”

Section: Methodsmentioning

confidence: 99%

Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS

et al. 2012

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A silver nanoparticle ensemble was prepared under ultrahigh vacuum (UHV) conditions by Volmer-Weber growth on a quartz substrate for surface-enhanced Raman scattering (SERS) investigations of pyrene molecules. To tune the surface plasmon resonance frequency in the vicinity of the excitation wavelength of 488 nm of the diode laser, the morphology of the silver nanoparticles was optimized. The substrates were mounted in a flow-through cell as part of the optical Raman set-up. A microsystem diode laser generates two slightly different emission wavelengths (λ = 487.61 nm and λ = 487.91 nm) with a spectral width <10 pm and an optical power of 20 mW, i.e. SERS experiments are possible but also shifted excitation Raman difference spectroscopy (SERDS) can be carried out. For trace analysis of pyrene in water we demonstrate SERS/SERDS experiments which lead to a limit of detection of 2 nmol/l for pyrene. These results suggest that with silver nanoparticle ensembles excited at their plasmon resonance at 488 nm combined SERS/SERDS measurements can be effectively performed for in-situ trace analysis of pollutant chemicals in water.

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Section: Methodsmentioning

confidence: 99%

Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS

et al. 2012

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“…The SHG improves the signal-to-noise-ratio significantly due to the suppression of ASE. The emission had a constant wavelength over typical measurement times of 180 s. The SHG light source shows a diffraction limited beam quality [18]. The spectral tuning of the diode laser was determined to  DFB /T = 0.066 nm/K (Δ DFB /T = 0.69 cm -1 /K).…”

Section: Second Harmonic Generation Using a Dfb-laser As Pump Sourcementioning

confidence: 99%

Miniaturized diode laser-based light sources forin-situshifted excitation Raman difference spectroscopy

2013

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Weak Raman bands are often covered by pronounced background signals due to fluorescence or Rayleigh scattering. Several techniques to separate Raman lines from the background are known. In this paper, diode laser based light sources will be presented suitable for shifted excitation Raman difference spectroscopy (SERDS). The two wavelengths are realized by varying the injection current, by addressing two micro-integrated ECLs or by temperature tuning. Due to the freedom of choice in the wavelengths using diode lasers, the emission wavelength can be selected with respect to the addressed application (e.g. the required penetration depth) or the plasmonic resonances of the substrates for surface enhanced Raman spectroscopy. Devices were developed for the wavelengths 488 nm, 671 nm, and 785 nm. The two emission wavelengths each were selected to have a spectral distance of 10 cm -1 according to the typical width of Raman lines of solid or liquid samples. Output powers between 20 mW for the shorter wavelength devices and 200 mW for the red emitting lasers were achieved at electrical power consumptions below 1 W. With a footprint of only 25 x 25 mm 2 including all collimation and filter elements, these devices are well suited for portable applications. The diode lasers were implemented into Raman measurement systems. The SERDS signalto-background ratio was improved by several orders of magnitude.

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“…A SH output power of up to 35 mW green light at 530 nm could be achieved [135]. Maiwald et al [136] could demonstrate a miniaturized SHG device consisting of a DFB RW diode laser lens coupled to a ridge waveguide PPLN crystal (Fig. 29).…”

Section: Shg With Diode Lasers and Waveguide Crystalsmentioning

confidence: 99%

Blue‐green light generation using high brilliance edge emitting diode lasers

Jechow¹,

Menzel

Paschke

et al. 2010

Laser & Photonics Reviews

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A review about second harmonic generation using edge emitting diode lasers and nonlinear crystals to obtain laser radiation in the blue-green spectral range is presented. Therefore, pump laser radiation with high brightness and narrow bandwidth is necessary. Thus, this review gives an overview of the advances made with distributed feedback and Bragg reflector lasers, tapered lasers and amplifiers as well as external cavity diode lasers and master oscillator power amplifier schemes to achieve high brilliance emission. Since periodically poled materials have enabled high second harmonic conversion efficiencies with low and moderate pump powers, the review is focused on frequency doubling using those materials. The most commonly used materials, their properties and limitations are discussed briefly. Single pass and resonant SHG setups with waveguide and bulk nonlinear crystals are discussed and an emphasis on building compact and integrated devices is made. PPLN waveguide crystal pumped by a DFB laser (above). Integrated SHG device on a CCP heatsink (below).

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Second-harmonic-generation microsystem light source at 488 nm for Raman spectroscopy

Cited by 27 publications

References 5 publications

Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS

Naturally grown Ag nanoparticles on quartz substrates as SERS substrate excited by a 488 nm diode laser system for SERDS

Miniaturized diode laser-based light sources forin-situshifted excitation Raman difference spectroscopy

Blue‐green light generation using high brilliance edge emitting diode lasers

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