Cryogenic Ho:CaF<sub>2</sub>laser pumped by Tm:fiber laser

Jelínek, Michal; Kubeček, Václav; Ma, Wei; Zhao, Beibei; Jiang, Dapeng; Su, Liangbi

doi:10.1088/1612-2011/13/6/065004

Cited by 15 publications

(4 citation statements)

References 22 publications

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“…Also, several weaker absorption peaks can be seen around 1913 nm (0.2 • 10 −20 cm 2 ) which correspond to a 5 I 8 → 5 I 7 transition in holmium. From figures 1 and 5 it is obvious that the lasing in the 2.1 µm region can be obtained if the active medium is pumped at 1.9 µm, which is typical for pure Ho-doped active media [15]. To obtain the emission cross-section spectra we use the reciprocity method (McCumber relation) [6]…”

Section: Resultsmentioning

confidence: 99%

Diode-pumped laser and spectroscopic properties of Yb,Ho:GGAG at 2 µm and 3 µm

Švejkar¹,

Šulc²,

Němec³

et al. 2020

Laser Phys. Lett.

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In this paper, spectroscopy and laser results obtained with new active medium Yb,Ho:GGAG (gadolinium-gallium-aluminum-garnet) emitting laser radiation at 2.09 µm and 2.94 µm are shown. The absorption, emission cross-section, and radiative decay time for several energy levels Yb 3+ ( 2 F 5/2 ), Ho 3+ ( 5 I 6 and 5 I 7 ) are presented. Using longitudinal diode pumping the laser action at 2 µm and 3 µm together with the wavelength tunability at several spectral bands 2063-2113 nm, 2860 nm, and 2912-2942 nm were reached.

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Section: Resultsmentioning

confidence: 99%

Diode-pumped laser and spectroscopic properties of Yb,Ho:GGAG at 2 µm and 3 µm

Švejkar¹,

Šulc²,

Němec³

et al. 2020

Laser Phys. Lett.

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“…Especially, the CaF 2 crystal has a high thermal conductivity (9.7 W m −1 K −1 ) and a negative refractive coefficient dn/dT(−11.5 × 10 −6 K −1 ) [22], which is very beneficial for reducing the thermal effects in laser crystals. Up to now, the diode-pumped Tm,Ho:CaF 2 [23], or fiber-pumped Ho:CaF 2 lasers [24,25], have been investigated. However, as far as we know, there is no report on the intra-cavity pumped Ho:CaF 2 laser.…”

Section: Introductionmentioning

confidence: 99%

Efficient Ho:CaF₂ laser intracavity-pumped by a Tm:LuAG laser in-band pumped at 1.6 µm

et al. 2018

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In this paper we demonstrate an efficient intra-cavity pumped Ho:CaF2 laser based on a tandem in-band pumping scheme for the first time. The laser diode at 1.6 µm was employed to pump a Tm:LuAG crystal. At an incident laser diode pump power of 9.5 W, the in-band pumped Tm:LuAG laser realizes a maximum output power of 2.3 W and a slope efficiency of 33.4%. With the same incident pump power, a maximum output power of 1.5 W at 2085 nm was achieved with a slope efficiency of 24.2% in the Ho:CaF2 laser intra-cavity pumped by the Tm:LuAG laser. The beam quality factor of the Ho:CaF2 laser at the maximum output level was measured to be 1.3 and 1.2 in the horizontal and vertical directions, respectively.

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“…Ho:YAG and Ho:YLF are the most established Ho-doped crystals for high peak power operation. Recent experiments have also shown promising results using CaF 2 as host [155,156]. These results using Ho:CaF 2 are however preliminary, and this section will focus on the commercially available crystals Ho:YAG and Ho:YLF.…”

Section: Laser Gain Media For High Energy Operation At 2 µM Wavelengthmentioning

confidence: 99%

“…Early demonstrations of lasing in Ho-doped media were in fact performed at 77 K [137,138]. In more recent work, cryogenic cooling of Ho-doped media has been successfully used to improve the performance of Ho:YLF [146,149], Ho:YAG [165] and Ho:CaF 2 [155]. Figure 12 shows the absorption cross-section of Ho:YLF around the emission wavelength of 2052 nm from room temperature to cryogenic temperature.…”

Section: Spectroscopic Propertiesmentioning

confidence: 99%

Development of a high intensity Mid-Ir OPCPA pumped by a HO:YLF amplifier

Sánchez Peacham

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The continuous development of laser sources delivering ultra-short light pulses underpins much of the current progress in experimental science, particularly in the domain of physics concerned with strong-field phenomena. Laser systems that allow scaling of strong-field experiments to unexplored regions of the electromagnetic spectrum, specially the mid-IR range (2 µm < lambda < 20 µm), have proved to be a powerful tool enabling the study of new physical processes. It is becoming clear however, that conventional laser sources are unsuited for this purpose, and in order to fully investigate these novel regimes a new generation of laser systems is required. This thesis describes a new laser source of high-intensity, mid-IR light. A long-wavelength pumped optical parametric chirped pulse amplifier (OPCPA) design is chosen as the architecture for this laser, overcoming many of the drawbacks hindering other approaches. This thesis presents two novel sub-systems required for the successful development of a mid-IR OPCPA. The first is a compact, fibre-driven source of broadband mid-IR pulses relying on difference frequency generation (DFG) in the nonlinear crystal CdSiP2. This laser is the seed source in the OPCPA and supports transform-limited pulses corresponding to less than 3 optical cycles at the operating wavelength of 7 µm. The second sub-system is a pump source based on a Ho:YLF chirped pulse amplifier (CPA) pumped by commercial Tm-fibre laser. The pump system delivers over 0.25 J of pulse energy at a wavelength of 2052 nm. The laser system described in this thesis is a developmental milestone towards the realisation of a multi-mJ source of few-cycle duration, carrier-to-envelope phase (CEP) stable mid-IR pulses. The system is designed to operate at a centre wavelength of 7 µm, delivering pulses with an energy of 0.2 mJ and a temporal duration of 180 fs at 100 Hz repetition rate. The output parameters of the laser presented in this work lead to a peak power of 1.1 GW and potentially a peak intensity of 7·1014 W/cm2. These values are already compatible with strong-field experiments and enable a ponderomotive force 77 times larger than a standard Ti:Sapphire laser. El desarrollo de fuentes de luz láser que emiten pulsos ultracortos sustenta una parte importante del progreso actual en ciencia experimental, especialmente en el ramo de la física relacionada con los fenómenos de campo electromagnético intensos. Los sistemas láser que permiten escalar experimentos de campo electromagnético intenso a regiones sin explorar del espectro electromagnético, especialmente en el rango del infra-rojo medio (2 µm < lambda < 20 µm), han demostrado ser una poderosa herramienta facilitando el estudio de nuevos procesos físicos. Sin embargo, las fuentes láser convencionales no son adecuadas para este propósito, y para investigar a fondo estos nuevos regímenes se requiere una nueva generación de sistemas láser. Esta tesis describe una nueva fuente láser de luz de infra-rojo medio de alta intensidad. La arquitectura que elegimos es un amplificador de pulso óptico dispersado paramétrico (OPCPA por sus siglas en inglés) bombeado con una longitud de onda larga y superando así muchos de los inconvenientes de otros diseños. Esta tesis presenta dos sub-sistemas nuevos necesarios para el desarrollo exitoso de un OPCPA de infra-rojo medio. El primero es una fuente compacta de infra-rojo medio basada en un láser de fibra generando pulsos de banda ancha utilizando generación por diferencia de frecuencia (DFG por sus siglas en inglés) en el cristal no lineal CdSiP2. Este láser es la fuente origen del OPCPA y genera pulsos con un ancho de banda compatible con una duración menor a 3 ciclos ópticos a la longitud de onda central de 7 µm. El segundo subsistema es una fuente de bombeo basada en un amplificador de pulso dispersado (CPA por sus siglas en inglés) en el material Ho:YLF bombeado por un láser comercial de fibra dopada con tulio. El sistema de bombeo proporciona más de 0.25 J de energía por pulso a una longitud de onda de 2052 nm. El sistema láser descrito en esta tesis es un paso importante hacia el desarrollo de una fuente de infra-rojo medio capaz de generar pulsos con energía de multi-mJ de pocos ciclos ópticos de duración y fase de portador a envolvente estable (CEP por sus siglas en inglés). El sistema está diseñado para operar a una longitud de onda central de 7 µm, generando pulsos con una energía de 0.2 mJ y una duración temporal de 180 fs a una frecuencia de repetición de 100 Hz. La especificación del láser presentado en este trabajo conduce a una potencia máxima de 1.1 GW y potencialmente a una intensidad máxima de 7 · 1014 W / cm2. Estos valores ya son compatibles con experimentos de campo fuerte y permiten una fuerza pondero-motriz 77 veces mayor que un láser estándar de Titanio-Zafiro.

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Cryogenic Ho:CaF₂laser pumped by Tm:fiber laser

Cited by 15 publications

References 22 publications

Diode-pumped laser and spectroscopic properties of Yb,Ho:GGAG at 2 µm and 3 µm

Diode-pumped laser and spectroscopic properties of Yb,Ho:GGAG at 2 µm and 3 µm

Efficient Ho:CaF₂ laser intracavity-pumped by a Tm:LuAG laser in-band pumped at 1.6 µm

Development of a high intensity Mid-Ir OPCPA pumped by a HO:YLF amplifier

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Cryogenic Ho:CaF2laser pumped by Tm:fiber laser

Cited by 15 publications

References 22 publications

Diode-pumped laser and spectroscopic properties of Yb,Ho:GGAG at 2 µm and 3 µm

Diode-pumped laser and spectroscopic properties of Yb,Ho:GGAG at 2 µm and 3 µm

Efficient Ho:CaF2 laser intracavity-pumped by a Tm:LuAG laser in-band pumped at 1.6 µm

Development of a high intensity Mid-Ir OPCPA pumped by a HO:YLF amplifier

Contact Info

Product

Resources

About

Cryogenic Ho:CaF₂laser pumped by Tm:fiber laser

Efficient Ho:CaF₂ laser intracavity-pumped by a Tm:LuAG laser in-band pumped at 1.6 µm