Rapid and adjustable shifted excitation Raman difference spectroscopy using a dual‐wavelength diode laser at 785 nm

Abstract

In this paper, we present rapid and adjustable shifted excitation Raman difference spectroscopy (SERDS). A dual-wavelength diode laser emitting at 785 nm is used as the excitation light source. Two laser resonators are realized in a single chip, and two distributed Bragg reflector gratings provide two excitation lines at 785 nm. For each laser line, an optical power of 170 mW is achieved. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

Surface‐enhanced Raman spectroscopy for on‐site analysis: A review of recent developments

“…[65] Near infrared (NIR) or deep ultraviolet (UV) laser sources could effectively avoid those problems and, taking into consideration cost, weight, and fluorescence mitigation, most portable Raman spectrometers adopt diode lasers. [66][67][68] Therefore, the wavelengths of solid-state semiconductor lasers currently employed are 532 nm or 785 nm; the excitation wavelength of 1064 nm might be proposed in few cases (Figure 4). [69,70] Cullumet al presented a lightweight and highly integrated, portable Raman spectrometer which consisted of a 632.8 nm helium-neon (He-Ne) laser, an acousto-optic tuneable filter (AOTF), and an avalanche photodiode.…”

“…[68,[73][74][75] Maiwald et al developed a rapid and adjustable SERDS, in which a dual-wavelength diode laser based on the excitation wavelength of 785 nm was used as the light source ( Figure 6). [66] F I G U R E 3 Schematic representation of a portable Raman spectrometer F I G U R E 4 Compact advantage 1064 system operated by external computer and equipped by knee-shaped optical head. (Adapted from Vitek et al (2012) [69] with permission from Elsevier.…”

“…DBR: distributed Bragg reflector. (Adapted from Maiwald et al (2018) [66] with permission from Wiley.) F I G U R E 7 General layout of the dual optical fibre Raman probe; B, C, D, different fibre arrangements of the probe heads.…”

Recent advances in linear and nonlinear Raman spectroscopy. Part XIII

“…The results demonstrate rapid and adjustable SERDS using a dual-wavelength diode laser as a potential tool for Raman applications such as real-time diagnostic during surgeries, in situ measurements, which require quick on-site decisions, and Raman experiments with strong background interferences, for example, from laserinduced fluorescence and ambient light. [204]…”

Continuous Wave THz System Based on an Electrically Tunable Monolithic Dual Wavelength Y-Branch DBR Diode Laser

“…In this work, we analyse the suitability of an electrically tunable two color distributed Bragg reflector (DBR) diode laser at 785-nm centre wavelength for THz applications. The diode laser was successfully developed for the abovementioned Raman spectroscopic applications [11,12] where the two wavelengths were used alternatingly. In contrast, in this work, the laser operates at both wavelengths simultaneously in order to generate THz radiation.…”