Gain characteristics of longitudinally excited F2 lasers

El-Osealy, M A M; Jitsuno, Takahisa; Nakamura, Kazunari; Horiguchi, Shiro

doi:10.1016/s0030-4018(02)01317-2

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…Here, we focus on the longitudinal excitation scheme for a simple and inexpensive device [9][10][11][12]. In this scheme, the excitation discharge is in the direction of the laser axis, and the electrodes are well separated and have small discharge cross-section.…”

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confidence: 99%

Longitudinally Excited CO2 Laser with Short Laser Pulse like TEA CO2 Laser

Uno

Nakamura

Goto³

et al. 2009

J Infrared Milli Terahz Waves

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We have developed a longitudinally excited CO 2 laser with a short laser pulse similar to that of TEA and Q-switched CO 2 lasers. A capacitor transfer circuit with a low shunt resistance provided rapid discharge and a sharp spike pulse with a short pulse tail. Specifically, a circuit with a resistance of 10 M Ω provided a spike pulse width of 103.3 ns and a pulse tail length of 61.9 μs, whereas a circuit with a shunt resistance of 100 Ω provided a laser pulse with a spike pulse width of 96.3 ns and a pulse tail length of 17.2 μs. The laser pulses from this longitudinally excited CO 2 laser were used for processing a human tooth without carbonization and for glass marking without cracks.

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mentioning

confidence: 99%

Longitudinally Excited CO2 Laser with Short Laser Pulse like TEA CO2 Laser

Uno

Nakamura

Goto³

et al. 2009

J Infrared Milli Terahz Waves

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“…The small signal gain was measured with the configuration shown in Fig. 1 [25,26]. To measure the small signal gain of a longitudinal discharge tube, a short-pulse CO 2 laser serving as a seed pulse source was used as an oscillator.…”

Section: Methodsmentioning

confidence: 99%

Gain measurements of longitudinally excited CO2 laser using low-pressure gas without helium

Miyagawa,

Uno,

Watarai

et al. 2024

Appl. Phys. B

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The gain characteristics of a CO2 laser pumped by a longitudinal pulsed discharge were investigated to develop a compact He-free CO2 laser operating at a high repetition rate. The longitudinal discharge tube had an inner diameter of 0.8 cm and a length of 45 cm. High-voltage pulses with a discharge starting voltage of 13.4–30.2 kV at a rise time of about 321 ns were applied to the discharge tube. CO2/N2 mixture gas with mixing ratios of 1:0, 1:1, 1:2 and 1:3 was used. The small signal gain coefficient was measured by inputting a seed CO2 laser pulse into the longitudinal discharge tube. The small signal gain coefficient depended on the delay time between the start of the discharge in the longitudinal discharge tube and the input of a seed CO2 laser pulse, the gas mixing ratio, the gas pressure, the repetition rate and the input energy to the longitudinal discharge tube. In this work, in He-free gas, the maximum small signal gain coefficient at a repetition rate of 300 Hz was 2.11%/cm with a delay time of 30.4 μs, a CO2/N2 gas mixing ratio of 1:2, a gas pressure of 2.6 kPa and an input energy of 191 mJ.

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“…CO 2 lasers with a wide variety of excitation schemes have been developed, such as DC discharge [2][3][4], RF discharge [5,6], transverse discharge [7][8][9][10], and longitudinal discharge [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Simple Short-Pulse CO2 Laser Excited by Longitudinal Discharge without High-Voltage Switch

Uno

Jitsuno

Akitsu

2012

J Infrared Milli Terahz Waves

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We have developed a longitudinally excited CO 2 laser without a high-voltage switch. The laser produces a short laser pulse similar to those from TEA and Q-switched CO 2 lasers. This system, which is the simplest short-pulse CO 2 laser yet constructed, includes a pulsed power supply, a high-speed step-up transformer, a storage capacitor, and a laser tube. At high pressure (4.2 kPa and above), a rapid discharge produces a short laser pulse with a sharp spike pulse. In mixed gas (CO 2 : N 2 : He01: 1: 2) at a pressure of 9.0 kPa, the laser pulse contains a spike pulse of 218 ns and has a pulse tail length of 16.7 μs.

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Gain characteristics of longitudinally excited F2 lasers

Cited by 8 publications

References 17 publications

Longitudinally Excited CO2 Laser with Short Laser Pulse like TEA CO2 Laser

Longitudinally Excited CO2 Laser with Short Laser Pulse like TEA CO2 Laser

Gain measurements of longitudinally excited CO2 laser using low-pressure gas without helium

Simple Short-Pulse CO2 Laser Excited by Longitudinal Discharge without High-Voltage Switch

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