Characteristics of a stable, injection Q-switched Nd:phosphate glass regenerative amplifier for a chirped pulse amplification based Table Top Terawatt laser system

Sharma, Ashok; Raghuramaiah, M.; Mishra, K K; Naik, P. A.; Kumbhare, S. R.; Gupta, P. D.

doi:10.1016/j.optcom.2005.04.027

Cited by 17 publications

(5 citation statements)

References 37 publications

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“…Required tolerance on inter-grating groove density errors and aberrations to achieve desired pulsed beam parameters are discussed latter in this section. Regenerative amplifier [32], basically a Q-switched and cavity dumped (QS&CD) laser oscillator consists of cavity formed using ~100% reflectivity plane and curved mirror with radius of curvature of 6 m, includes two electromagnetic interference (emi) noise shielded 40 mm long deuterated potassium di-hydrogen phosphate (DKDP) crystal based single Pockels cells [33] together with 3 mm thick thin film polarizer to act as pulse injector and ejector to avoid a dedicated advanced switching electronics required for a single electro-optic unit.…”

Section: Description and Characteristics Of Laser Systemmentioning

confidence: 99%

“…Output pulse energy is stabilized below pump pulse energy fluctuations [32] via interplay of gain and loss of amplifier cavity and is achieved by ejecting amplified pulse at post peak buildup with re-optimized laser system and compressor parameters owing to accumulated nonlinear phase. While enhanced nonlinear phase help to minimize gain-narrowing of pre-amplifier, curvature of the amplified pulsed beam is also increased necessitating re-optimization of beam expander for faithful amplification of laser pulses in the power amplifier.…”

Section: For Clearer Illustration For Each Compressor Grating; (C) Va...mentioning

confidence: 99%

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Terawatt class space-time multiplexed chirped pulse amplification based Nd:glass laser system: development, performance characteristics and application

Sharma

2023

Preprint

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Twin energetic sub-picosecond duration laser pulses have been generated in air using space-time multiplexed chirped pulse amplification based all Nd:phosphate glass laser system. Multiple beam-lets are generated using beam splitting prior to compression to reduce energy fluence on compressor gratings and to avoid vacuum compressor. Eight pass all reflective single grating half Martinez grating pulse stretcher and complimentary double pass mixed grating Treacy compressor has been setup to provide stretching/ compression factor of 6x103 for ~ 200 fs laser pulses at 1055 nm, to avoid excess optical nonlinearities during amplification and propagation through optical elements. Stretched laser pulse with energy of 150 pJ is amplified using regenerative and four-pass power amplifier with an output pulse energy exceeding 2 J at minimum shot to shot interval of 90 s. Amplified stretched pulses are compressed to full width in range from 450 fs to 900 fs at half maxima, with partial compensation of gain narrowing with spectral broadening owing to accumulated nonlinear phase. Various issues of pulse compression in mixed grating compressor are discussed. For demonstration purposes, laser pulses have been applied to study nonlinear properties and modification of optical materials in air.

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Section: Description and Characteristics Of Laser Systemmentioning

confidence: 99%

Section: For Clearer Illustration For Each Compressor Grating; (C) Va...mentioning

confidence: 99%

Terawatt class space-time multiplexed chirped pulse amplification based Nd:glass laser system: development, performance characteristics and application

Sharma

2023

Preprint

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“…The double pass arrangement increases the pulse stretching by twofold. This type of dispersive pulse stretcher was used to temporally stretch laser pulses of duration 250 fs (FWHM) from a Nd:flouro phosphate glass oscillator to 240 ps (FWHM) by placing a pair of identical holographic gratings (groove density = 1740 l/mm) symmetrically outside of two identical achromatic lenses (focal length = 500 mm) at a distance of 250 mm and using a retro-reflector to obtain a linear chirp of 44 ps/nm at central wavelength of 1054 nm (Sharma et al, 2005).…”

Section: Pulse Stretching By Dispersionmentioning

confidence: 99%

Temporal Stretching of Laser Pulses

Khare¹,

Shukla²

2010

Coherence and Ultrashort Pulse Laser Emission

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“…However, the repetition rate of PAMs is low due to the poor heat conductivity coefficient of Nd:glass. Tens of minutes are usually required per shoot for heat recovery (Orth et al 1996;Peng et al 2014;Sharma et al 2005). Good beam quality is another important factor required in PAM, which is the premise of stable and safe amplification by the subsequent main amplifier.…”

Section: Introductionmentioning

confidence: 99%

Lamp-pumped eight-pass neodymium glass laser amplifier with high beam quality

Huang

Guo

et al. 2021

Opt Quant Electron

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This study presents a lamp-pumped Nd:glass laser system capable of achieving joule level output energy at 1-Hz repetition rate with high beam quality. The 1.8 J of energy in a 5 ns pulse was achieved with 1.5 mJ injected energy. The laser system includes a beam shaping module and an eight-pass, lamp-pumped amplifier. The laser amplifier demonstrated longterm energy stability of 1.76% PV and 0.29% RMS when operating at 1.8 J for 30 minutes. In a longer period of operation, no damage or obvious beam degradation was found. A uniform gain distribution with a single-pass small-signal gain of 3.89 was acquired with the four-lamp-pumping method, and thermally induced wavefront aberration was mitigated. Finally, a high beam quality was obtained using a homemade optically addressed liquid crystal light valve. After compensation, the near-field modulation decreased from 1.38 to 1.21, meanwhile, the beam contrast decreased from 6.54 to 4.71%. In terms of the far-field quality, a 90% far-field energy concentration was 2.5 times the diffraction limit.

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Characteristics of a stable, injection Q-switched Nd:phosphate glass regenerative amplifier for a chirped pulse amplification based Table Top Terawatt laser system

Cited by 17 publications

References 37 publications

Terawatt class space-time multiplexed chirped pulse amplification based Nd:glass laser system: development, performance characteristics and application

Terawatt class space-time multiplexed chirped pulse amplification based Nd:glass laser system: development, performance characteristics and application

Temporal Stretching of Laser Pulses

Lamp-pumped eight-pass neodymium glass laser amplifier with high beam quality

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