Ramakrishan, P

Sivaram, B M

Srinivasan, M

IACS Institutional Repository

["'/tan./ Ph'll>. SfB. 52-3:l (IU80) Gain of the Ct-NPO dye laser in different solvents P Rllimakri~hna.n, B M SiVllirllm Phy",O" Department and M Srinivasan Chemistry Department, Indian Institute of Technology Mad.ae·600 036 Ct-NPO (2-(I-napb,thyl)-5-Phonyl oxazolc) has boan reported Ho fn)' to w()~k M 0. laser in only five solvents (Deutsch and Bllss 1969, Naboikin et al1969, FU1\p.moto a.nd Ceccon 1970. Maeda Ilud Miyazoe 1971, Turek and Yllrdley 1971) \ In the pro~ent study we have obRorved IllSer actIOn ill 16 solvents and through a study of the gain tried to arrive at the most suitable ~olv"nt. Tho group of solvonts studied are hydrocarbons, alcohols, ketoneH Ilnd solvontR containing heavy atoms. Th(l gain of the sciontiUator dyo Ct-NPO 1Il each solvent waR measured hy the method of Shr.lllk and Dienes (1970) USing a nitrogen lasel' built by U~ . ' Table 1 givos tho wllvelength of the peak intonsity and thr. gain of the dye molecule Ct-NPO per unit kW input pump power a.t that wa.vt,longth in different, 8olvcnt,s. rt i8 found thB~ the solvonts in the aloohol group show a. gradual variation of ga.in from lower to higher alooholR Simila.rly with ketone solvcnt~. it is found tha~ in the on08 ha.vmg longor hydrocarhon chains, «-NPO has highor gain. This suggests tha~ the gain should bo larger in tho hydrooarhon solvents ami experiment al~o confirms thill. Tho roason for tho roduction in gain in the lower alcohols is Reemingly duo to the loss of onergy from the dye to the solvont la.ttiae, which enorgy is dissipated in the OR vibration of the a.lcohol moloculo. From the valuos of gain for group (d) solvents, in Ta.ble 1, it is seon that the Holvents containing hea.vy a.toms tend to reduoo the gain. ThiA is du .. to the fJxternal heavy atom effect (Schafer). This study suggests ~ha.t tho scientillator dye cx-NPO works effioiently a.s a dye laser in hydrooarbons with cyclohexane being the most suitable. Solvents conta.ining hea.vy a.toms suoh 1'8 ca.rbon tetra.chloride giVe vory low gain and are to be avoided. 52 Gain of the a,-NPO dye la8er Table 1. Q"in of ",·NPO in lUffetoni solv('utR (per moloeul. por unil. pump powGr) Solvent A) AIc.,..ls : I. MAthyl 2. Ethyl 3. Isopropyl 4. n.Butyl !J. ltiIoamyl 6. Capr'yli" B) Ke'one.s : 7. C,volohexanonn 8. AcotOllfl 9, Isobutyl M.thyl KetunE'! C) H'ljdrf)oarbo1Jb HI. Cyolohe"ane U. Bonzone 12 Toluentl 13. Xylene wavelength of t,he peak of the Gain( X ) 0'") St,Turture of solvoll! laser emlttSion (urn) 400.(1 :199.0 399.1> 39H.5 400.0 400.0 403.0 401.0 400.5 401 n 4000 400.5 :l.1lU ~ 53 4.41 4.78 !I.ll 0.25 :1.71 4042 748 622 5.80 6.21 CHaOH (,H,CH.OR l1H,CH(OH,)OH (~H.CR.CR.CH.OH mI,CH,CH,CH«(.:H,)OH CH,CH,CH,CH.CH(C.H,)CH.OH (,H,eOCR" GHaOH.OH(OR,)OOCH" C.I1 .. OoIl. C.H,OH, D) Solwmts conta'l,ning heal':V (chlorine) ntomR Ii. I, 2 Drchlor,,· othann 10. Chloroform 16. Oa.rbon Tetracillorido Acluaowledgmellt 404.0 400.0 !'i 04 :1.52 0.8U OIl.CICH.Ol OROI" COl, 53 The abovo Htudy waR C !l.rflod out. wit.h t,he fin ancia] !l.A~ista.nc(l from tho Department of Atomio Enorgy. Referellces Deutsch T F and B .... M 1969 IEEE Journal Q.E-5 260 NabOlkm Yu V e! al lU09 Opt. SpectroB. 28 1128 Furumoto H Wand Coccon H L 1970 IEEE .1. Q.E-8 262 M""da M and Mlyazoe Y 1971 Jap. J01lr oj App. Phy. May p. 6"2 Turek C A Bnd Yardloy 1971 IEEE J. ~7 102 Shank C V, DleD~s A and SHfva.t 1970Appl. Phy" Lett. 17 307 Top .... in Applied Phy,w8-Vol I Dye Laaor.-Ed. F P SQhaier Springer Verl"g, p 168 

Gain of the α-Npo Dye Laser in Different Solvents

http://arxiv.iacs.res.in:8080/jspui/bitstream/10821/4057/1/Gain%20of%20the%20%ce%b1-Npo%20Dye%20Laser_By%20P%20Ramakrishnan.pdf

Gain of the α-Npo Dye Laser in Different Solvents

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