Oscillation and gain characteristics of high power co-axially excited N2 gas lasers

J Infrared Milli Terahz Waves

Nakamura

Goto³

et al. 2009

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.

mentioning

confidence: 99%

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

J Infrared Milli Terahz Waves

Nakamura

Goto³

et al. 2009

“…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

J Infrared Milli Terahz Waves

Jitsuno

Akitsu

2012

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.

“…In the longitudinal excitation scheme, the excitation discharge is in the direction of the laser axis. [4][5][6][7][8][9][10] In N 2 lasers, the discharge tube is made of a dielectric pipe with a length of about 10-30 cm and an inner diameter of about 2-5 mm, 4-8 producing a laser beam with a circular cross-section. The length of the discharge tube defines the discharge length, and the inner diameter of the discharge tube defines the discharge cross-section.…”

mentioning

confidence: 99%

Note: Longitudinally excited N2 laser with low beam divergence

Review of Scientific Instruments

Akitsu

Jitsuno

2014

Self Cite

We developed a longitudinally excited N2 laser (337 nm) with low beam divergence without collimator lenses. The N2 laser consisted of a 30 cm long Pyrex glass tube with an inner diameter of 2.5 mm, a normal stable resonator formed by flat mirrors, and a simple, novel driver circuit. At a N2 gas pressure of 0.4 kPa and a repetition rate of 40 Hz, the N2 laser produced a circular beam with an output energy of 2.6 μJ and a low full-angle beam divergence of 0.29 mrad due to the uniform discharge formed by the longitudinal excitation scheme, the long cavity with the small aperture, and the low-input energy oscillation.