( There ( ( ( is ( a ( further advantage ) ) ) ( that ( ( the ( COIL laser ) ) ( generally ( produces ( ( ( single ( wavelength radiation ) ) , ) ( which ( is ( very ( helpful ( for ( forming ( a ( ( ( very well ) focused ) beam ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (NP (DT a) (JJ further) (NN advantage)) (SBAR (IN that) (S (NP (DT the) (NNP COIL) (NN laser)) (ADVP (RB generally)) (VP (VBZ produces) (NP (NP (JJ single) (NN wavelength) (NN radiation)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (RB very) (JJ helpful) (PP (IN for) (S (VP (VBG forming) (NP (DT a) (ADJP (ADVP (RB very) (RB well)) (VBN focused)) (NN beam)))))))))))))) (. .)))
There is a further advantage that the COIL laser generally produces single wavelength radiation, which is very helpful for forming a very well focused beam.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT a) (NN device)) (SBAR (WHNP (WDT that)) (S (VP (VBZ produces) (NP (NP (DT a) (ADJP (RB very) (VBN focused)) (NN beam)) (PP (IN of) (NP (NP (JJ visible) (NN light)) (PP (IN of) (NP (NP (RB just) (CD one) (NN wavelength)) (CC and) (JJ color) (NP (DT a) (NN laser)))))))))))) (. .)))