Lasers flashlamp pumped

Lick Observatory. The success of the LLNL/AVLIS demonstration led to the deployment of a pulsed dye laser / AO system on the Lick Observatory 3-m telescope (Friedman et al., 1995). LGS system (Fig. 14). The dye cells are pumped by 4 70 W, frequency-doubled, flashlamp-pumped, solid-state Nd YAG lasers. Each laser dissipates 8 kW, which is removed by watercooling. The YAG lasers, oscillator, dye pumps and control system are located in a room in the Observatory basement to isolate heat production and vibrations from the telescope. A grazing incidence dye master oscillator (DMO) provides a single frequency 589.2 nm pulse, 100-150 ns in length at an 11 kHz repetition rate. The pulse width is a compromise between the requirements for Na excitation and the need for efficient conversion in the dye, for which shorter pulses are optimum. The laser utilizes a custom designed laser dye, R-2 perchlorate, that lasts for 1-2 years of use before replacement is required. 

The pump lasers were designed and built at LLNL. Two laser cavity configurations are employed. Two "L" shaped cavities run at the full system repetition rate of 26 kHz, producing 40-50 W per laser. They pump the DM0 and preamplifier dye cells. Four "Z" cavity lasers run at 13 kHz, each producing between 60-80 W. They are interleaved in the power amplifier dye cell to produce an effective 26 kHz repetition rate. Flashlamps were used to pump the frequency-doubled YAG lasers as diode-pumps were much more expensive at the time the Keck LGS was designed. In addition, high wavefront quality is not required... 

Alster TS,McMeekin TO (1996) Improvement of facial acne scars by the 585 nm flashlamp-pumped pulsed dye laser. J Am Acad Dermatol 35 79-81... 

Manusciatti W, Fitzpatrick RE, Goldman MP (2000) Treatment of facial skin using combinations of CO Q-switched alexandrite, flashlamp-pumped pulsed dye, and Er YAG lasers in the same treatment session. Dermatol Surg 26 114-120 Jordan R, Cummins C, Burls A (2000) Laser resurfacing of the skin for the improvement of facial acne scarring a systematic review of the evidence. Br J Dermatol 142 413-423... 

Time Dependence. The pumped level population does not settle to within 90% of its steady state value until 30 nsec after the laser is turned on. Thus, while a steady state approximation is valid for a flashlamp pumped laser with a pulse length of the order of 1 p,sec, the signals using a Nd YAG pumped dye ( 10 nsec) may exhibit an observable time dependence. 

A resistor completed the circuit and signals were measured across the resistor. The laser was a flashlamp pumped tunable dye laser with a pulse duration of -1 ps and a peak power of several kW the bandwidth was 0.014 nm in the neighborhood of 589 nm. We used a stoichiometric H2-02 Ar flame of 1800 K, shielded with a mantle flame of identical composition. In the inner flame a 2500 pg/ml NaCl solution was nebulized. An extensive description of the experiment can be found elsewhere (7). 

SF(1) Flashlamp-pumped dye laser SF(2) nxNd YAG laser pumped dye laser... 

We have shown that pulsed dye lasers are also quite capable of generating transient QRLPP, similar to the cases of RLPP reported (8,9,20,21). We have used a flashlamp pumped dye laser (Candela LFDL-1), with output pulses of lA bandwidth,... 

Figure 25F-2 Schematic of a Nd YAG laser (a) and energy levels (b). The pump transitions are in the red region of the spectrum, and the laser output is in the near-infrared, The laser is flashlamp pumped. The region between the two mirrors is the laser cavity.

Ar-I- lasers, solid-state lasers, and laser-pumped and flashlamp-pumped dye lasers. Many of these lasers exhibit pulsed output, allowing the corresponding ONP experiments to exploit the high peak power, gated emission, and defined time resolution provided by such light sources. 

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