Pulsed gain measurements on CO2 lasers

  • 52 Pages
  • 2.38 MB
  • English
Naval Postgraduate School , Monterey, California
Gas l
About the Edition

An efficient procedure for determining the operational potential of a laser system is the experimental measurement of gain. Two laser systems, a flowing CO2-N2-He laser and a chemical CO2-HN3 laser, were studied using a pulsed gain measurement technique. The experimental investigation indicated that the flowing CO2-N2-He laser system could produce lasing action and that the saturation parameter was 15 watts/sq. cm. The experimental results for the chemical laser show a gain of approximately 8% per meter and agree qualitatively with a computer model of the CO2-HN3 laser. (Author)

Statementby D.J. Collins and T.L. Houck
ContributionsHouck, Timothy Lee, Naval Postgraduate School (U.S.)
The Physical Object
Pagination52 p. :
ID Numbers
Open LibraryOL25490934M

Two laser systems, a flowing CO2-N2-He laser and a chemical CO2-HN3 laser, were studied using a pulsed gain measurement technique. The experimental investigation indicated that the flowing CO2-N2-He laser system could produce lasing action and Pages: NAVALPOSTGRADUATESCHOC RNIA NPSCA NAVALPOSTGRADUATESCHOOL Monterey,California PulsedGainMeasurementsonCCULasers by s and' T.L.

onachemicalCC^-HN^laserandonaflowingCCL-N2laserwithheliumadded. A discussionof the theoryinvolved in calculating the unsaturatedgain co- efficient andthe saturationparameter is included to give an understanding.

Calculations of energy characteristics of multicomponent working media in CO2 gasdynamic lasers based on combustion products Journal of Applied Mechanics and Technical Physics, Vol. 20, No. 4 Theoretical gain‐optimization studies in CO 2 –N 2 gasdynamic by:   In TEA lasers and RF excited high gain lasers, the rear mirror can be replaced with a rotating grating, realizing two arbitrary spectral lines of tunable laser output in one laser system.

Download: Download high-res image (41KB) Download: Download full-size image; Fig. Experimental device of rapidly tunable pulsed CO 2 : Peng Ruan, Qikun Pan, Jijiang Xie, Chunling Liu, Yuan Chai. The carbon dioxide (CO 2) laser is one of the oldest and most important laser sources in a number of different fields of applications and especially in laser surgery.

The gas used for this special type of gas laser is a mixture of helium (82%), nitrogen (%), and carbon dioxide (%) which fills an arc discharge tube as shown in figure   The laser was an e- beam controlled discharge type [6]. Mirror separation was m with a nominal gain region of 10 cm 10 cm cm.

The e-beam laser pulse length and gain controlling discharge voltage were variable. The out- put laser was 10 10 cm with the feedback (convex) mirror completely decentered giving an L-shaped beam output.

4 1 Lasers: Fundamentals, Types, and Operations N N E 0 E E 1 E 3 E 0 E E 1 2 Fast decay Fast decay Fast decay Pumping Pumping Lasing Lasing (a) (b) Figure Energy level diagram for (a) three- and (b) four level laser systems.

N 1 to achieve the condition of population inversion between E 2 and E 1 at moderate pumping. Threshold Gain Coefficient for Lasing Laser beam undergoes.

Family of CO and CO 2 Lasers, with power from Watts to Kilowatts for processing materials ranging from paper to metal. Coherent offers the broadest portfolio of completely sealed low-power CO and CO 2 laser products in the market. This family of sealed lasers is available in a wide range of models, with output powers ranging from 20W to W.

Solid-state lasers include all optically pumped lasers in which the gain medium is a solid at room temperature. Semiconductor lasers do not belong in this category because these lasers are usually electrically pumped and involve different physical processes (see Back to Basics, Aprilp.

65). A comprehensive set of pulsed DF and DF‐CO2 laser performance measurements is presented as a function of gas mixture composition (F2, O2, D2, diluent, and CO2), laser threshold gain, and reaction i. Laser linewidth from high-power high-gain pulsed laser oscillators, comprising line narrowing optics, is a function of the geometrical and dispersive features of the laser cavity.

To a first approximation the laser linewidth, in an optimized cavity, is directly proportional to the beam divergence of the emission multiplied by the inverse of the.

To measure energy per pulse of a repetitively pulsed beam, one typically uses a pyroelectric type sensor; thermal sensors are used for measuring average power of a CW or a repetitively pulsed beam, and they can also be used for measuring energy of a “single shot” pulse – meaning a single pulse fired once (with at least seconds before.

A laser linewidth can be measured with a variety of techniques: For large linewidths (e.g. > 10 GHz, as obtained when multiple modes of the laser resonator are oscillating), traditional techniques of optical spectrum analysis, e.g.

based on diffraction gratings, are suitable.A high frequency resolution is difficult to obtain in this way. For example, a Gentec-EO laser power meter can be used to measure average power.

Pulsed laser: Pulse Energy (Joules) = Average Power (Watts) / Repetition Rate (Hertz) Let’s put some real values in there and assume that you are working with a laser that has a fixed W output and a repetition rate that can be tuned from 20 Hz to 1 kHz.

Low-Temperature CO-Oxidation Catalysts for Long-Life CO2 Lasers Volume of NASA conference publication: Author: United States.

National Aeronautics and Space Administration: Editors: David R. Schryer, Gar B. Hoflund: Publisher: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division.

Different CO2 laser pulse modes (Q-switched and modulated laser pulses) enable different functions for finishing optical glass materials, from ablation through surface correction polishing (a). The secret is a carefully constructed scan pattern and optimized laser parameters (b), allowing the laser to create complex, freeform structures such as.

2 column measurement, while simultaneously a laser is stepped across a line doublet near nm in the Oxygen A-band for an atmospheric pressure measurement []. Both lasers are pulsed at a 10 kHz rate, and the two absorption line regions are repeatedly sampled in wavelength steps at ~ Hz.

Both laser transmitters utilize tunable diode lasers. About Our CO2 Laser Team. The engineers at PaR's Laser Center of Excellence (COE) have over three decades of experience developing advanced pulsed CO2 lasers and laser technology, with specialized skills in the areas of high power and high pressure pulsed CO2 laser systems, laser modelling and design, high voltage switching networks, optics, and related applications.

Amplification. The active laser medium (laser gain/amplification medium) is a gas discharge which is air- or water-cooled, depending on the power being applied. The filling gas within the discharge tube consists of around 10–20% carbon dioxide (CO 2), around 10–20% nitrogen (N 2), a few percent hydrogen (H 2) and/or xenon (Xe) (usually only used in a sealed tube), and the remainder of the.

Relaxation times of the 00°1 and 10°0 CO 2 vibrational levels and the afterglow gain at μ were studied by a pulsed‐gain technique, for pure CO 2, CO 2:He, and CO 2:N 2 gas mixtures in 22‐mm‐ and 34‐mm‐bore nonflowing laser amplifiers.

Measurements of the exponential rise, τ r, and decay, γ d, times of the afterglow gain pulse were made using a cw ‐μ CO 2 laser as the. Other lasers, like Nd or Yb diode-pumped solid-state (DPSS) lasers, lend themselves to be operated both in CW or pulsed operation.

Other lasers, like laser diodes or OPSLs, are not suitable at all for pulsed operations. Within this context, we define as “pulsed” laser. Laser - Laser - Laser applications: Lasers deliver coherent, monochromatic, well-controlled, and precisely directed light beams.

Although lasers make poor choices for general-purpose illumination, they are ideal for concentrating light in space, time, or particular wavelengths. For example, many people were first introduced to lasers by concerts in the early s that incorporated laser light.

The following types of lasers are particularly attractive for mode locking: In the s, dye lasers were routinely used, which were pumped with argon ion dyes have a broad gain bandwidth, allowing for very short r, dye lasers have been largely replaced with solid-state lasers once these were able to deliver similar or better performance.

This Field Guide provides the essential information on laser pulse generation, including Q switching, gain switching, mode locking, and the amplification of ultrashort pulses to high energies.

Pulse characterization is also covered, along with the physical aspects and various technical limitations. Overview of Modulated and Pulsed Diode Laser Systems Application Note 4 P peak = mW The average power can be calculated as Pavg = (9 10 12J) ( Hz) = 9 10 7W Pavg = mW The following gure is an actual measurement of the pulses in Table1.

Auto Gain. The exposure control dialog shown in Figure 2 below is accessed by right-clicking the Imager Gain or Exposure Time box. When Enable auto gain adjustment is selected, Enable auto exposure adjustment is automatically deselected and the exposure time will now be fixed.

The laser’s pulse repetition rate in kHz can be entered in the PRR field to automatically calculate a.

Details Pulsed gain measurements on CO2 lasers PDF

pulsed laser A laser that emits energy in a series of short bursts or pulses and that remains inactive between each burst or pulse. The frequency of the pulses is termed the pulse-repetition frequency. carbon dioxide (CO 2) laser A gas laser in which the energy-state transitions between vibrational and rotational states of CO2 molecules give emission at long IR, about 10 µm, wavelengths.

Pulsed dye lasers produce pulses of visible light at a wavelength of or nm with pulse durations of the order of –40 ms. Pulsed dye laser treatment can be combined with radiofrequency to enhance effects; lower PDL doses possible with the combincation can reduce adverse effects.

resonator with a high repetition rate, rf-excited, waveguide CO2 laser. Pulses approximately 50 ns wide were generated both at m in HCOOH, and +n in CH,F. The pulse width of the FIR radiation was studied as a function of the CO2 pulse width, and the relative delay between the two was measured. Pulsed operation of lasers refers to any laser not classified as continuous wave, so that the optical power appears in pulses of some duration at some repetition rate.

This encompasses a wide range of technologies addressing a number of different motivations. Some lasers are pulsed simply because they cannot be run in continuous mode.

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In other cases the application requires the production of.With six times the power of most CO2 lasers, the UltaPulse® laser system is the laser for advanced applications, with a full spectrum of aesthetic and surgical capabilities IPL (Intense Pulsed Light) Long Pulsed Nd:YAG.

Fractional Non Ablative. Diode Lasers. Radio-Frequency (RF) RF Micro-Needling.

Description Pulsed gain measurements on CO2 lasers EPUB

Q-Switched. BLEND X™ Alex YAG.Thorlabs provides an extensive selection of lasers and other specialized coherent sources, such as our correlated photon-pair source. Options range from individual laser diodes and DPSS lasers to complete laser solutions such as fiber-coupled lasers, HeNe lasers, femtosecond lasers, and nanosecond pulsed lasers.

Also found here is our selection of semiconductor optical amplifiers and gain chips.