At the peak, the Raman gain coefficient for silica fibers is 9.4×10−14 m W−1 for a pumping wavelength λp = 1.0 μm and varies as λp−1. At this wavelength, a shift of 15 THz corresponds to 50 nm. The most significant feature of the Raman gain in silica fibers is that...
where Δv˜is the Raman shift expressed in wavenumber, λ0is the excitation wavelength, and λ1is the Raman spectrum wavelength. Since in Raman scattering, the wavelength is often expressed in units of nanometres (nm), the formula can scale for this unit conversion explicitly, expressing: ...
Time-lapse experiment clearly shows peak shift of polystyrene (refer- ence channel) and polypropylene (main channel) caused by laser wavelength drift. Since both reference and main channel were col- lected from the same laser source and acquired simultaneously by the imaging CMOS sensor, we could...
The empirical relationship between the Raman shift and size reported here for the diamond nanocrystals can provide a good formula for using Raman spectroscopy as a tool to measure size of nanocrystals. Due to the simplicity and appli- cability of the model, it may be extended to more other ...
The Raman crystalline in the fresnoite structure adjusts the laser wavelength and generates laser output provided with fixed frequency shift, the Raman crystalline in the fresnoite structure is obtained through a czochralski method, the general formula is A2RM2O8, wherein A=Ca, Sr or BA; R=...
Indeed, in the regime when DE À 1 the population is dominantly in the ground state, the Raman gain is at its maximum and corresponds to the most common SRS configuration, with the system energy being primarily determined by the Raman interaction and the stark shift difference between the ...
Ramanshift/era 一Ramanshift/(?m—l Fig.2RamanspectraofnaturalandHPHTsyntheticdiamondsfromNi-CandFe-C(H)system (a):Naturaldiamond;(b):SyntheticdiamondfromNi — Csystem;(c):SyntheticdiamondfromFe-C(H)system 5006007008009001000600700800900 WavelengttdnmWavelengthhml ...
Thus, energy-level matching between molecules and graphene can be dynamically achieved to ensure effective CT transitions by simply altering the applied potentials. Distinct from metal substrates, graphene (especially in a single or few layers) shows additional potential for a shift in the Fermi ...
A relatively large amount of a concentrated protein solution is indispensable to get Raman signals, and this made it impossible to use the ordinary 1.89-μm pulse generated by H2 Raman shift of a Q-switched Nd:YAG laser as a heat pulse. The reason for this is that the large absorption ...
6. The method of claim 1 further comprising using a light source that emits illuminating light that illuminates the region of tissue with a plurality of wavelength bands. 7. The method of claim 6 further comprising using a tunable light filter to control the wavelength of illuminating light. 8...