Stimulated Raman scattering of laser radiation in Raman crystals

Simultaneous stimulated Raman scattering and second harmonic generation in periodically poled lithium niobate

“…For input pulses of 140 fs duration, the effective crystal length should ideally be sub-mm for maximum second harmonic conversion. However, the application of longer crystals is understood to reduce the threshold and increase the efficiency of the SRS process [7]. For this reason and also for ease of handling, the 6.5 mm long crystal was retained, although we acknowledge that this ultimately reduced the SHG conversion efficiency.…”

“…Furthermore, the acceptance bandwidth for QPM structures is typically larger than those for conventionally phasematched devices since QPM allows the use of the same polarization for the input and generated frequencies [6]. Solid-state nonlinear materials such as PPLN are well-suited to efficiently generating SRS radiation as the nonlinear gain coefficient is higher than in fluid media due to an increase in the concentration of Raman scattering centres [7]. Although there are many reports of SRS in bulk nonlinear materials, reports on SRS in periodically poled materials are currently limited.…”

<title>CW and Q-switched diode-pumped laser operation of Yb<formula>^{<roman>3+</roman>}</formula>:NaLa(MoO<formula><inf><roman>4</roman></inf></formula>)<formula><inf><roman>2</roman></inf></formula></title>

“…Preliminary spectroscopic parameters of this material were reported in [6]. It is also important to note that NLM is an efficient Raman active medium [7,8].…”

A Novel Technique for Designing High Power Semiconductor Optical Amplifier (SOA)-Based Tunable Fiber Compound-Ring Lasers Using Low Power Optical Components

“…Semiconductor optical amplifiers (SOAs) [43], stimulated Raman scattering (SRS) amplifiers [44,45] and stimulated Brillouin scattering (SBS) amplifiers [46,47] have also been used as gain media in different fiber laser systems. However, the SOAs are more advantageous than their above-mentioned counterparts because they are compact, light, less expensive, efficient, and available for different operational regions from a wide range of wavelength spectra.…”