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Dye lasers PPT

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TYPES,WORKING, ADVANTAGES, APPLICATION

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Dye lasers PPT

  1. 1. DYE LASERS BY-ABHISHEK RANAN BATCH 11 ISP, CUSAT
  2. 2. GENERAL DSCRIPTION A dye laser is a laser which uses an organic dye as the lasing medium, usually as a liquid solution. It is also known as organic dye lasers which are produced in liquid gain media. There are over 200 dye lasers which produce tuneable laser operating from wavelength ranging from 320 nm to 1200 nm. It is because of broad emission and gain spectrum of dyes which leads to tuneability and short pulses. ONH+ H N O O Cl- Rhodamine 6G, 570-610 N H O+ N H Acridine red, 600-630 nm O O H OH H OH OH H H H O HO HO O Esculin, 450-470
  3. 3. Typical dye concentration 1024 to 1025 dye molecules/m3 Organic polyatomic molecules withlong chain with conjugated double bonds Rhodamine, polymemine (700-1500nm), coumarine (320-400nm), xanthene (500-700nm) and more. Solvent Methanol, ethanol, water or ethylene glycol Additional chemicals added to prevent intersystem crossing and prohibit degration of the dye.The laser gain medium consists of strongly emitting and absorbing organic dyes dissolved in solvent.
  4. 4. Close-up of a table-top CW dye laser based on Rhodamine 6G, emitting at 580 nm (yellow). The emitted laser beam is visible as faint yellow lines between the yellow window (center) and the yellow optics (upper-right). The orange dye-solution enters the laser from the left and exits to the right, and is pumped by a 514 nm (blue-green) beam from an argon laser. The pump laser can be seen entering the dye jet, beneath the yellow window.
  5. 5. EXCITATION MECHANISM
  6. 6. EXCITATION MECHANISM CONT.. Selection rule: ∆S = 0  S0 → S1 allowed also T2 → T1 Fluorescence emission  S1 → S0 Losses:  Intersystem crossing mostly due to collision  S1 → T1  Accumulates atT1 (T1 → S0 very weak 10-100us)  Phosphoresence  T1 → S0  Absorption  S1 → S2  T1 → T2 (almost equal to S1 → S0 emission)
  7. 7. LASER PUMPED PULSED TUNEABLE LASERSThis class of lasers produce a tuneable ultranarrow frequency pulsed laser output over wavelength ranging from 190 um to 4.5 um. The output energies range from tens to hundreds of milijoules. The pump beam is split into several separate beams, with one beam used to pump a narrow frequency output tuneable oscillator. The other beams are used to side pump or end pump a series of dye amplifiers.
  8. 8. FLASHLAMP PULSED DYE LASER The dye laser is surrounded by a coaxial cylindrically shaped flash lamp. Provision for water cooling is made between flash lamp and dye cell. This laser produces 5J per second in 1.5 us pulse duration or a peak power of over 3 MW per pulse. The laser has an input power of 1000J and capable of operating at a 0.5 Hz repetition rate. Uses RH6G dye and is tuned to operate at 585-nm wavelength for medical applications.
  9. 9. MODE LOCKED LASERS This type of configuration gives femtosecond dye laser pulses, and must be designed with odd number of beam waists within the cavity. The optical path length between the two dye jets is one fourth of the optical path around the entire ring. There are tow counter propagating pulses within the cavity , this ensures that both the pulses will have equal properties by allowing the gain recovery time to be same for each. Also, Maintaining the critical dimension or geometry of such a cavity is important.
  10. 10. ADVANTAGES Broad Emission spectrum Tuneable Very short pulses Achievable Wide selection of dyes for different emission wavelength ranges and absorbance
  11. 11.  Tunable in a wide range of wavelengths  Research oriented program in Astronomy  Pollution monitoring  Studies of atomic physics, photochemistry, spectroscopy in solids  Isotopes separation(uranium)  Medical –shatter kidney stones or gall bladder,remove birthmarks. Application
  12. 12. REFERENCES BOOK BY WILLIAM SILVAST BOOK BY K.R NAMBIAR WIKIPEDIA.COM
  13. 13. THANK YOU FOR YOUR ATTENTION

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