Compression of amplified chirped optical pulses

Strickland, D.; Mourou, G.

doi:10.1016/0030-4018(85)90120-8

Cited by 3,456 publications

(1,513 citation statements)

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“…The Yb:glass has the thermal diffusivity α=κ/(C p ρ) of 3.68×10 −7 (m 2 /s), where the thermal conductivity κ=0.85 W/(m·K), the specific heat C p =0.823 J/(g·K) and the density ρ=2.81 g/cm 3 . The radius of the pumping area of the Yb:glass was b=0.5 mm from the experiments.…”

Section: Resultsmentioning

confidence: 99%

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Temporal Change of Thermal Lens Effects on Highly Pumped Ytterbium Glass by Wavefront Measurement

Nishimura¹,

Akaoka²,

Ohzu³

et al. 2001

Journal of Nuclear Science and Technology

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The temporal change of thermal lens effects has been measured for the development of high efficient laser system. Ytterbium phosphate glass was used due to its high saturation fluence property. A free running flashlamp pumped Ti:sapphire laser was developed for the high energy pump source. Pumping intensity on the glass surface exceeded 800 kW/cm 2 which is enough high for laser diode simulator. Shack-Hartmann wavefront sensor system was applied to measure the thermal lens effects on a highly pumped ytterbium glass oscillator. The temporal change of wavefront was successfully measured at high repetition rate of 100 Hz. The measured wavefront were expanded to Zernike coefficients. Cooling process for the focus coefficient agreed well with the prediction of unsteady one dimensional heat conduction.

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Section: Resultsmentioning

confidence: 99%

“…1,2) Here, a compact and efficient high peak power laser based on Chirped Pulse Amplification (CPA) is a key issue. 3) Since the demonstration of CPA, 15 years have been passed. Nowadays, Ti:sapphire and Nd:glass are widely used for gain materials in commercially available CPA lasers.…”

Section: Introductionmentioning

confidence: 99%

Temporal Change of Thermal Lens Effects on Highly Pumped Ytterbium Glass by Wavefront Measurement

Nishimura¹,

Akaoka²,

Ohzu³

et al. 2001

Journal of Nuclear Science and Technology

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“…On the other hand, single mode fiber geometry imposes fundamental limits on pulse energy due to limited extractable energy in the fiber, nonlinear pulse distortions and damage issues. In the case of femtosecond pulse amplification fiber nonlinearities are the primary limiting factor because of long propagation paths and small beam diameters.The chirped pulse amplification (CPA) concept is commonly used to overcome this detrimental effect [1][2]. Recently, several modifications have been introduced -pulse shaping [3] or misaligned stretcher and compressor configuration [4] -to push pulse energy limits even further.…”

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confidence: 99%

“…The chirped pulse amplification (CPA) concept is commonly used to overcome this detrimental effect [1][2]. Recently, several modifications have been introduced -pulse shaping [3] or misaligned stretcher and compressor configuration [4] -to push pulse energy limits even further.…”

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Femtosecond fiber CPA system in a single pass configuration

Nejbauer

Laskownicki

Szczepanek

et al. 2014

Photon. Lett. Poland

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Abstract-We present a compact Yb-doped fiber chirped pulse amplification system set in a single pass configuration. The system is capable of delivering 34μJ pulses with 200kHz repetition rate. When seeded with a low average power oscillator, the amplifier optical-tooptical efficiency is as high as 37% and the gain reaches 52dB. Temporal pulse degradation due to self-phase modulation is explored. One stage amplification allowed us to limit the set-up complexity, typical of multi-stage CPA systems.Fiber lasers and fiber amplifiers are growing in importance as they can provide both high average output power and good beam quality at the same time [1]. On the other hand, single mode fiber geometry imposes fundamental limits on pulse energy due to limited extractable energy in the fiber, nonlinear pulse distortions and damage issues. In the case of femtosecond pulse amplification fiber nonlinearities are the primary limiting factor because of long propagation paths and small beam diameters.The chirped pulse amplification (CPA) concept is commonly used to overcome this detrimental effect [1][2]. Recently, several modifications have been introduced -pulse shaping [3] or misaligned stretcher and compressor configuration [4] -to push pulse energy limits even further. Most of the setups reported so far utilize two or more amplification stages [5][6][7] to obtain tens of J energy levels with a reduced (<1 MHz) repetition rate. Other works explore the limits of the highest possible pulse energy or average power [3,8] at the expense of significant complication of the amplifier set-ups.Here we describe a simplified system where femtosecond pulses from a low average power modelocked oscillator are amplified in a single pass configuration in a Yb-doped single mode large mode area (LMA) fiber, reaching 50J at 200kHz. To reduce nonlinear effects, the CPA technique is used, but with moderate-size optical elements and thus a modest pulse stretching ratio. We show how the temporal characteristics of the output pulse is affected by fiber nonlinearities.The system consists of a passively mode locked femtosecond oscillator, a grating stretcher-compressor * E-mail: nejbauer@ichf.edu.pl pair, an electro-optical modulator (Pockels cell) pulse picker and an active medium -single mode Yb-doped photonic crystal fiber set in a single pass configuration.The femtosecond oscillator is presented schematically in Fig. 1. The original design is described in [9]. The active medium of the oscillator is 1.2-mm Brewster-cut Yb:KYW crystal pumped with a 980nm single mode fiber coupled laser diode emitting 560mW of average power. Passive mode-locking is obtained by introducing a semiconductor saturable absorber mirror SESAM [10] in the place of a cavity end mirror. The resonator generates pulses of 350fs duration at 94MHz repetition rate. The central wavelength is set to 1030nm with a 4.3nm FWHM bandwidth. The average output power is about 90mW and the beam quality factor is M 2 < 1.1. The schematic of the CPA amplifier is presented in Fig. 2. The seedi...

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“…Such a system is not commercially available and therefore a challenge for development on its own right. The PFS pump source with these specifications is based on the chirped-pulse amplification (CPA) principle [13] using Yb:YAG as the amplification medium pumped by highpower laser diodes [14]. In addition, the short-pulse pumped OPCPA approach demands a very accurate and stable synchronization since seed and pump pulses are only a few-ps long.…”

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Frontend light source for short-pulse pumped OPCPA system

et al. 2009

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We present the development of a light source for generating optically synchronized seed pulses both for the parametric amplifier chain and the pump-laser chain of the Petawatt Field Synthesizer (PFS), which is currently under construction at MPQ. The PFS system aims at delivering waveform-controlled few-cycle laser pulses with PW-scale peak power using optical parametric chirped pulse amplification (OPCPA). Methods of generating the broadband nearinfrared (NIR) seed pulses for the OPCPA chain by spectral broadening using few-cycle pulses are presented. We also demonstrate the generation of a supercontinuum spanning up to three octaves (270-1500 nm) using cascaded hollowcore fibers which supports sub-cycle pulse duration.

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Compression of amplified chirped optical pulses

Cited by 3,456 publications

References 5 publications

Temporal Change of Thermal Lens Effects on Highly Pumped Ytterbium Glass by Wavefront Measurement

Temporal Change of Thermal Lens Effects on Highly Pumped Ytterbium Glass by Wavefront Measurement

Femtosecond fiber CPA system in a single pass configuration

Frontend light source for short-pulse pumped OPCPA system

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