Highly scannable injection seeded nanosecond Ti:sapphire ring laser

Abstract

Abstract.A widely tunable injection seeded Ti:Sa ring cavity has been developped and characterized. The seeding source is a single mode quasi continuous wave Ti:Sa laser, continually tunable over more than 2.5 cm −1 (75 GHz). Its short term (pulse to pulse) stability is on the order of ± 3.2 MHz at a repetition rate of 20 Hz. The long term absolute stability is limited up to now to about ± 10 MHz. These frequency charactristics are transferred to the pulsed emission with minor degradations. The frequency chirps and shifts during the pulses are also studied using an optical heterodyne technique. PACS

Oxygen atom kinetics in CO2 plasmas ignited in a DC glow discharge

“…The laser set-up used for HR-TALIF measurements (shown schematically in figure 1), uses a commercial single-mode continuous Titanium:Sapphire (Ti:Sa) laser (Coherent MBR 110 pumped by a 10W Verdi Nd:YVO 4 laser) to seed a home-built nanosecond pulsed ring cavity Ti:Sa laser, pumped by a 20Hz 532nm Nd:YAG laser (Quantel CFR200) [60][61][62][63]. The seed laser is injected colinearly with the pump laser into a Ti:Sa crystal.…”

A narrowband infrared source based on orientation-patterned GaAs for standoff detection of chemicals

“…To analyse the instantaneous frequency during the pulse, we applied the heterodyne beat-note analysis exposed in Ref. [58] that was already applied on near infrared lasers [59] and OPOs [60]. In a NesCOPO, a frequency chirp within the pulse can be either due to a frequency chirp in the pump pulse or to partial overlap between idler and signal modes as illustrated in Fig.…”

“…13 (top) with a difference frequency of 220 MHz, and we adapted the method described in Ref. [59] to retrieve the instantaneous frequency. In fact, due to the asymmetric nature of the idler pulse, it is difficult to extract properly the pulse shape by a simple numerical lowpass filter.…”

“…The instantaneous frequency shift can be obtained as explained Ref. [59]. The oscillating part of the detected signal can be written as follows:…”

Multispecies transmitter for DIAL sensing of atmospheric water vapour, methane and carbon dioxide in the 2 μm region

“…Finally, we evaluated the evolution of the "instantaneous" frequency during the pulse on a nanosecond timescale. To analyze the potential frequency chirps, we employed an optical heterodyne method which has been largely developed and implemented in the field of injection seeded pulsed laser and OPO in order to assess the quality of the injection process 16,17,18 . Figure 6 illustrates a typical beating signal that was used to extract the frequency shifts as well as the envelope of the beat waveform, which corresponds to the signal pulse temporal shape.…”