Physics and technology of tunable pulsed single longitudinal mode dye laser

Sridhar, G.; Rawat, V.S.; Kawade, Nitin; Singh, Sunita; Gantayet, L.M.

doi:10.1007/s12043-010-0163-z

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…The development, demonstration and mode hop free scanning of an SLM dye laser in a short GIG cavity in our laboratory has been reported earlier [15,16]. In this paper, we report the effect of temperature variation of the dye solution on the wavelength of the SLM dye laser.…”

Section: Introductionmentioning

confidence: 71%

A study of the solvent temperature effects in a single longitudinal mode pulsed dye laser

et al. 2013

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The effect of the dye solution temperature in a single longitudinal mode pulsed dye laser pumped by a copper vapor laser was studied in detail. The study was carried out using a laser wavelength meter. It was experimentally observed that the wavelength tuning of the single mode dye laser with respect to the optical path length was limited to a grating pass band of 2.5 GHz beyond which a second mode appeared, a mode hop occurred and the laser wavelength settled at a new value. We observed cyclic behavior of single to two mode oscillation when the cavity length was changed continuously in one direction. The wavelength jitter band was observed to be ∼2.5 pm for two mode oscillation while it was ∼0.5 pm for single mode oscillation. By stabilizing the dye solution temperature to a set value of 20 ± 0.15 • C the cyclic behavior was eliminated and only a small drift of 1.4 pm was obtained over more than 30 min of operation. The wavelength change was attributed to variation of the optical path length due to variation of the refractive index with temperature. The cyclic behavior of single mode to two modes was established by applying voltage to the end mirror PZT, which changed the cavity length with a resolution of 8.5 MHz nm −1 .

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Section: Introductionmentioning

confidence: 71%

A study of the solvent temperature effects in a single longitudinal mode pulsed dye laser

et al. 2013

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“…The CFD model was used to simulate the temperature rise. The details of the dye cell (5 × 1 × 70 mm 3 ) of our SLM dye laser are reported elsewhere [6,7,36]. This dye cell is made of two precisely cut stainless steel pieces (wire cut by electrical discharge machining from a single stainless steel block), polished and welded together to form the flow channel.…”

Section: Simulation Of the Longitudinally Pumped Slm Dye Lasermentioning

confidence: 99%

A computational model for transient temperature rise in a dye laser gain medium pumped by a copper vapor laser

Rawat¹,

Gantayet²,

Sridhar³

et al. 2014

Laser Phys.

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Spectrally stable dye lasers play an important role in techniques based on high resolution spectroscopy and atomic spectroscopy. The spectral purity of a dye laser is affected when the pump power to it is increased beyond the threshold. When the pump power is increased beyond the threshold, two mode oscillations occur which decrease the spectral purity of the dye laser. The effect of higher pump pulse energies on transient thermal effects has been studied using a computational fluid dynamics (CFD) model and the disturbances to the laser cavity have been studied using commercially available ray tracing software. The change in the cavity length was determined from the CFD model for several dye concentrations and pump powers. The results of the CFD model have been verified by published results and experimental results from our system. Our study shows that in the longitudinally pumped single mode laser change in the cavity length is a more dominant disturbance than thermal blooming. Our model is useful for the design of the dye cell.

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“…A dye cell with a 1 mm flow channel was used in the SLM laser; a larger width of dye cell could decrease the cavity free spectral range (FSR), which demands higher dispersion in the cavity. A SLM dye laser with dye cell cross section of 5 mm 2 was designed and used in our SLM dye laser [22]. As an alternative to the experimental methods, detailed CFD studies were undertaken for several rectangular flow channels having cross sectional areas ranging from 5 × 1 mm 2 to 20 × 1 mm 2 and cell lengths from 30 to 80 mm.…”

Section: Dye Cell Geometries and Flow Analysismentioning

confidence: 99%

“…A SLM dye laser based on Littman's configuration has been extensively used by various groups [22][23][24][25][26][27][28][29][30][31]. A large angle of incidence for the grazing incidence grating (GIG) makes it possible to obtain a larger grating dispersion without a beam expander.…”

Section: Slm Grazing Incidence Grating Dye Lasermentioning

confidence: 99%

Design of the dye cell of a dye laser to facilitate repetitive operation in the single longitudinal mode

et al. 2013

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A dye cell was designed and fabricated to facilitate high repetition rate single longitudinal mode (SLM) operation with low viscosity solvents such as ethanol. The flow circulation (vortex) in the dye cell was eliminated by reducing the flow cross section from 10 to 5 mm 2 with optimized flow entry. The physical dimension of dye cell is very important for short cavity SLM lasers in terms of keeping the cavity length small. Flow visualization of various geometries in the dye cell was carried out using commercial computational fluid dynamics (CFD) software. It was found that the slit as well as tubular entry to the dye cell of cross section 1 × 10 mm 2 shows flow circulation (a vortex) near the entry to the dye cell. The SLM was obtained from a 10 mm 2 flow cross section dye cell with a high viscosity solvent such as binary solvent (200 cP) or glycerol (1400 cP) with a higher bandwidth. The pulse to pulse fluctuations in the bandwidth and wavelength are generally associated with dye flow instabilities. These flow related instabilities reduced with higher viscosity solvents, which results in an increased bandwidth of the SLM dye laser (by nearly 40%). A specially designed dye cell was fabricated and used for SLM operation at two different pump lasers having different pulse repetition rates ranging from 20 to 6000 Hz. SLM operation was demonstrated for longitudinal pumping of the dye cell with low viscosity solvents. Time averaged SLM line widths of 400 and 175 MHz were obtained with a copper vapor laser (CVL) and Nd:YAG laser, respectively. A single pulse line width of 315 MHz was obtained with a CVL pumped dye laser.

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Physics and technology of tunable pulsed single longitudinal mode dye laser

Cited by 10 publications

References 7 publications

A study of the solvent temperature effects in a single longitudinal mode pulsed dye laser

A study of the solvent temperature effects in a single longitudinal mode pulsed dye laser

A computational model for transient temperature rise in a dye laser gain medium pumped by a copper vapor laser

Design of the dye cell of a dye laser to facilitate repetitive operation in the single longitudinal mode

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