Passively mode-locked Nd: YAG and ruby lasers with high brightness per unit active volume

Varnavsky, O.P.; Kirkin, A. N.; Leontovich, A. M.; Mirzoyan, R. G.; Mozharovsky, A.M.; Solomatin, I. I.

doi:10.1016/0030-4018(83)90262-6

Cited by 12 publications

(3 citation statements)

References 3 publications

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“…Rampel further reported that such a laser beam is necessary for applications namely: microcircuit machining, drilling and cutting since controlled material removal in localized area was necessary. In the 1970s and 1980s papers were published by several authors in relation to increasing the laser beam brightness [8,10], and the use of high brightness lasers in the military sector [11]. Thereafter, numerous papers were published with respect to enhancement of laser beam brightness and modification of the transverse mode [12], changing the cavity design within the optical resonator [16,22], and the beam delivery design [23,25].…”

Section: Background Of Laser Beam Brightnessmentioning

confidence: 99%

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Understanding laser beam brightness: A review and new prospective in material processing

Shukla

Lawrence

Zhang

2015

Optics & Laser Technology

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a b s t r a c tThis paper details the importance of brightness in relation to laser beams. The 'brightness' of lasers is a term that is generally not given much attention in laser applications or in published literature. With this said, it is theoretically and practically an important parameter in laser-material processing. This study is first of a kind which emphasizes in-depth, the concept of brightness of lasers by firstly reviewing the existing literature and the progress with high brightness laser-material processes. Secondly, the techniques used to enhance the laser beam brightness are also reviewed. In addition, we review the brightness fundamentals and rationalize why brightness of lasers is an important concept. Moreover, an update on the analytical technique to determine brightness using the current empirical equations is also provided. A modified equation to determine the laser beam brightness is introduced thereafter. Furthermore, research studies previously conducted to modify laser design to affect laser beam brightness are also discussed. The paper not only involves a review of the techniques used to improve laser beam brightness but also reviews how bright lasers can be employed to enhance/improve laser process capabilities and cost reduction of the laser assisted processes in manufacturing.

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Section: Background Of Laser Beam Brightnessmentioning

confidence: 99%

“…Varnavsky et al [10] conducted a similar investigation by using an unstable resonator design. This comprised of a concave and convex mirror assembly.…”

Section: Modification Of Optical Resonator Beam Delivery and Opticsmentioning

confidence: 99%

Understanding laser beam brightness: A review and new prospective in material processing

Shukla

Lawrence

Zhang

2015

Optics & Laser Technology

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“…For this situation pulses with durations At L less than the inverse gain width Avq 1 have been generated (ruby and Nd:YAG at low temperature) [114][115][116]. For high-gain active media slow saturable absorbers are sufficient for short pulse generation, since the leading part is shortened by the absorber and the trailing part is shortened by the gain medium [18].…”

Section: Passive Mode-lockingmentioning

confidence: 99%

Passive Q-switching and mode-locking for the generation of nanosecond to femtosecond pulses

Penzkofer

1988

Appl. Phys. B

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Abstract. The passive and hybrid Q-switching and mode-locking of solid-state lasers, dye lasers, semiconductor lasers and gas lasers is reviewed. The dynamics of saturable absorbers and reverse saturable absorbers is illustrated. The nanosecond pulse generation by passive and hybrid Q-switching of low-gain active media is described. The picosecond and femtosecond pulse generation by passive and hybrid mode-locking in low-gain and highgain active media is analysed. The performance data of passively and hybridly mode-locked cw femtosecond dye lasers are collected. The pulse shortening of ultra-fast pulses with saturable absorbers in intra-cavity and extra-cavity configurations is discussed. PACS: 42.55The photonic switching of lasers provides an important technique to generate short light pulses in the nanosecond to femtosecond time regime. The photons generated in the laser modify the transmission of the switching elements and cause the formation of short pulses. Saturable absorbers serve as intensity or energy dependent coupling elements in most cases. But occasionally intensity and energy-dependent refractive index changes have been applied. Nanosecond light pulses are generated in passively Q-switched lasers. The passive mode-locking of laser leads to the generation of nanosecond, picosecond or femtosecond pulse trains. The actual pulse durations depend on the spectroscopic data of the active media and of the passive elements.The nonlinear response of absorbers to light radiation is introduced in the next section [1][2][3][4][5][6][7][8][9]. The passive, and the hybrid Q-switching are discussed in . The passive, and the hybrid modelocking are described in Sect. 3. A distinction is made between the mode-locking of low-gain and high-gain active media [35 45]. The simultaneous Qswitching and mode-locking is discussed shortly in Sect. 4. A final section is devoted to the intra-cavity and extra-cavity pulse shortening with saturable absorbers [46][47][48][49][50].

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Single-pulse ruby laser with an unstable telescopic resonator and polarized output

Апанасевич¹,

Gakhovich²,

Grabchikov³

et al. 1987

J Appl Spectrosc

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Passively mode-locked Nd: YAG and ruby lasers with high brightness per unit active volume

Cited by 12 publications

References 3 publications

Understanding laser beam brightness: A review and new prospective in material processing

Understanding laser beam brightness: A review and new prospective in material processing

Passive Q-switching and mode-locking for the generation of nanosecond to femtosecond pulses

Single-pulse ruby laser with an unstable telescopic resonator and polarized output

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