A study of the self-injected laser for subnanosecond pulse generation

Cruz, C. H. Brito; Palange, E.; Martini, F. De

doi:10.1007/bf00697428

Cited by 13 publications

(5 citation statements)

References 20 publications

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“…where -t`j UCt) -3 Ux C1-e°) 4 Cl) and the circulation time of the resonator TR determined by its optical length LR >>o< TR The dependence of the power contrast, that is the relation between the power of radiation filling the resonator and the pulse peak power for different values of Jo at TR -3ns , is shown in Fig. 3.…”

Section: Pulse Generation In a System With Applied Voltagementioning

confidence: 99%

“…In autors opinion a more efficient self-injection can be realized by the change of voltage on PC. In the range 3Uxì4 or SUx,4 in the resonator containing one -directional electrooptical 0-switch C Pockels cell -polarizer) or in the range 3Ux /4 or 5U /4 in the resonator containing two -directional electrooptical 0-switch Cpolarizer -Pockels cell-polarizer).…”

Section: Introductionmentioning

confidence: 99%

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Generation Of Subnanosecond Laser Pulses Formed During The Resonator Q-Switching.

1987

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The paper presents the results of preliminary investigations both theoretical and experimental of Q-switched and self -injected Nd:YAG oscillator. A new technique is described for producing single nanosecond pulse or trains of them.Generation of subnanosecond laser pulses Formed during the resonator Q-switching.Institute of Plasma Physics and Laser tlikrofusion 00-908 Warsaw, p . o . box 43 ABSTRACT The paper presents the results of preliminary investigations both theoretical and experimental of Q-switched and self-injected Nd:YAG oscillator. A new technique is described for producing single nanosecond pulse or trains of them.

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Section: Pulse Generation In a System With Applied Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generation Of Subnanosecond Laser Pulses Formed During The Resonator Q-Switching.

1987

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“…The optical design of our system is similar to common Q-switched laser using Pockels Cell. The basic idea of the self-injection technique is based on the fact that by an electro-optical cavity loss modulation to generate optical seed pulse much shorter than the usual Q-switched output (~ tens of nanosecond) 6 .…”

Section: Introductionmentioning

confidence: 99%

High-energy Alexandrite picosecond laser using the self-injection technique

Oh,

Ryu,

Lee

et al. 2024

Solid State Lasers XXXIII: Technology and Devices

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High-energy ultrashort pulse lasers have been developed in a variety of applications such as medical treatment, defense, semiconductor and manufacturing. In terms of aesthetic dermatology, Alexandrite (Cr 3+ :BeAl2O4) lasers have an attractive and useful wavelength band (700~800nm). Therefore, alexandrite lasers with shorter pulses and higher energy are required in the medical device market. Since alexandrite medium has a low energy gain at room temperature, it is not easy to make a flash-pumped picosecond alexandrite laser that produces sufficiently high output energy. To generate high-power picosecond laser pulses, we used self-injection and ultra short pulse generation techniques including Q-switching and cavity dumping. We have developed picosecond 755 nm alexandrite laser which can be operated at pulse width in the range from 600 to 2000 ps. A maximum average output energy of 400mJ was achieved in the picosecond regime.

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“…The 1,064 nm transition provides the lowest threshold laser lines in Nd:YAG. To realize ultra-short pulse laser, it has adopted a particular combination of many techniques such as Q-switching, mode-locking, and cavity dumping [8]. Generally, Q-switching can implement high peak power but is limited to nanosecond pulse width.…”

Section: Introductionmentioning

confidence: 99%

Development of 250 picosecond Nd:YAG laser for dermatologic applications in Republic of Korea: development report

2022

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Background and Objectives: Picosecond laser therapy is a fast-growing field in cosmetic dermatology. This paper presents the "PICOCARE MAJESTY", a picosecond laser system with a pulse duration of 250 ps at 1,064 nm, a peak power of 2 GW, and an energy instability of less than ±5% over 30 minutes of operation.Materials and Methods: The picosecond laser system consists of a master oscillator power amplifier based on a diode-pumped microchip picosecond laser, a beam expander, an optical isolator, a polarizer, a pre & power ampli fier, and a highly reflective coated mirror. The articulated arm was used to deliver the treatment beam and a collimating beam to the skin surface. The system is designed to automatically recognize the type of handpiece and laser spot size to improve user convenience. Results:We have developed "PICOCARE MAJESTY", a picosecond 1,064 nm/532 nm Nd:YAG laser system that provides pulses of duration 250 ps/190 ps and has a maximum energy of 500 mJ/250 mJ at wavelengths of 1,064 and 532 nm, respectively. In addition, six types of handpieces, Zoom, Micro Lens Array, Collimation, Dye 595 nm and 660 nm, and Diffraction Optical Element were developed to be recognized automatically. Conclusion: WONTECH developed the first commercialized 250 picosecond Nd:YAG laser in Republic of Korea. The Ministry of Food and Drug Safety (Republic of Korea) and the Food and Drug Administration (U.S.) approved the MAJESTY laser device in July 2021 and January 2022, respectively.

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A study of the self-injected laser for subnanosecond pulse generation

Cited by 13 publications

References 20 publications

Generation Of Subnanosecond Laser Pulses Formed During The Resonator Q-Switching.

Generation Of Subnanosecond Laser Pulses Formed During The Resonator Q-Switching.

High-energy Alexandrite picosecond laser using the self-injection technique

Development of 250 picosecond Nd:YAG laser for dermatologic applications in Republic of Korea: development report

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