cw laser emission from coumarin dyes in the blue and green

7-Amino-4-methylcoumarin

“…The title compound, (I), an aminocoumarin laser dye also known as coumarin 120 (Eastman Kodak Co., Rochester, NY, USA) or coumarin 440 (Exiton Inc., Dayton, Ohio, USA), has been observed to produce laser emissions in the 370-760 nm region, pumped by an XeF eximer laser (Eschrich & Morgan, 1985), and in the visible region by various other continuous wave (CW) lasers (Tuccio, Drexhage & Reynolds, 1973;Yarborough, 1974;Kato, 1975). Structural details of several related aminocoumarin laser-dye compounds have been reported (Selladurai & Subramanian, 1992;Chirmakali, Sivakumar & Natarajan, 1989, 1990Chinnakali, Sivakumar, Natarajan & Mathews, 1992;Chinnakali, Selladurai, Sivakumar, Subramanian & Natarajan, 1990;Masilamani, Chandrasekar, Sivaram, Sivasankar & Natarajan, 1986;Messager & Delugeard, 1974;Murthy, Ramamurthy & Venkatesan, 1988).…”

Aggregation Characteristics of Laser Dye Rhodamine 6g in Aqueous Surfactant Solutions

“…Xanthene dyes, of which Rhodamines form an important group (Peterson et af., 1970;Snarley and Schafer, 1969), have been in very active use as laser dyes.Rhodamines as a class of laser dyes are known for their high water solubilities, but this beneficial property has been marred by the detrimental formation of dimeric aggregates which impair the laser action (Marling et al, 1974). Different approaches adopted to circumvent the dimerization phenomenon include the use of solvents like hexafluoroisopropanol and N,N-dipropylacetamide (Tuccio et al, 1973), and the addition of surfactants as deaggregating agents (Tuccio and Strome, 1972;Marling et al, 1974;Alfano et al, 1973).…”

Mode-locked CW dye lasers

“…Mode-locking with a saturable absorber has produced the best results: transform limited pulses of approximately 1.5 ps duration. The methods described here should be applicable to other CW dye lasers [31][32][33] and should open the way for the generation of such pulses over the entire visible spectrum.…”