High gain, multi-pass, femtosecond Yb: KYW crossed-crystals amplifier pumped by high-brightness tapered laser diodes

IF 2 3区物理与天体物理 Q3 OPTICS Applied Physics B Pub Date : 2025-02-10 DOI:10.1007/s00340-025-08398-y

Simone Dabbene, Riccardo Gotti, Wenze Xue, Sara Pizzurro, Arne Heinrich, Manuel Messner, Antonio Agnesi, Federico Pirzio

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Abstract

In this work we present the development and characterization of a high-gain, double-pass and four-pass femtosecond Yb: KYW amplifier pumped by two polarization-coupled tapered laser diodes emitting a total power of 9 W at 979 nm. The amplifier utilized relies on a crossed-crystals configuration, employing two 3-mm-long 10%-at. doped N_g-cut Yb: KYW crystals with orthogonal orientation of the respective N_m-axis in order to optimize pump absorption and minimize gain narrowing. The amplifier was seeded either with almost Fourier-transform limited ∼300-fs pulses from an in-house-made Yb: KYW oscillator, or with 5-ps-long, chirped pulses (∼15 nm full-width at half-maximum bandwidth around 1030 nm) from a commercial Yb-doped fiber laser. In both cases, we achieved a four-pass small-signal gain G₀ > 100 and an optical-to-optical extraction efficiency of about 30%, even at low seed average power levels. The amplifier showed excellent spatial beam quality preservation up to the full pump power (M² < 1.1) and good preservation of the pulse duration with negligible gain narrowing in case of the 300-fs bulk seeder and pulses \(\:\le\:\)200 fs after compression in case of the fiber laser seeder.

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由高亮度锥形激光二极管泵浦的高增益、多通、飞秒Yb: KYW交叉晶体放大器

在这项工作中，我们提出了一种高增益，双通和四通飞秒Yb: KYW放大器的开发和特性，该放大器由两个偏振耦合的锥形激光二极管泵浦，在979 nm处发射总功率为9 W。放大器利用依赖于交叉晶体配置，采用两个3毫米长的10%-at. doped Ng-cut Yb: KYW crystals with orthogonal orientation of the respective Nm-axis in order to optimize pump absorption and minimize gain narrowing. The amplifier was seeded either with almost Fourier-transform limited ∼300-fs pulses from an in-house-made Yb: KYW oscillator, or with 5-ps-long, chirped pulses (∼15 nm full-width at half-maximum bandwidth around 1030 nm) from a commercial Yb-doped fiber laser. In both cases, we achieved a four-pass small-signal gain G0 > 100 and an optical-to-optical extraction efficiency of about 30%, even at low seed average power levels. The amplifier showed excellent spatial beam quality preservation up to the full pump power (M2 < 1.1) and good preservation of the pulse duration with negligible gain narrowing in case of the 300-fs bulk seeder and pulses \(\:\le\:\)200 fs after compression in case of the fiber laser seeder.

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.