Spectroscopy and lasing of cryogenically cooled Yb, Na:CaF2

Lai, W. J.; Phua, P. B.; Andriukaitis, G.; Pugžlys, Audrius; Sidorov, D.; Irshad, Afshan; Baltuška, Andrius; Giniūnas, Linas; Danielius, R.; Su, Liangbi; Xu, Jun; Li, R.

doi:10.1007/s00340-009-3740-4

Cited by 40 publications

(17 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This beam makes one bounce in the crystal and is imaged in the wavefront sensor with a 1:1 ratio. The thermal wavefront deformation is isolated by subtracting the static wavefront (without pumping) [20,26]. As expected with increasing absorbed pump power, the dioptric power is increasing proportionally in absence of saturation (Fig.…”

Section: Amplifier Setupmentioning

confidence: 99%

Diode-pumped Yb:CaF $$_2$$ 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

et al. 2014

View full text Add to dashboard Cite

The dynamic thermal issues of the Yb:CaF2 crystals within a multi-tens-mJ-energy multipass amplifier operating in the 20-100 Hz repetition rate range and pumped in quasi-cw regime have been studied at different timescales. Thermal response times of the system have been precisely investigated and analyzed, for the first time to our best knowledge in such amplifiers. This study includes a dual timescale analysis: in the long-time-scale (second) with direct thermography mapping and in the millisecond range with thermal lensing in a pump-probe configuration. Very atypical positive lens behavior with fluorites will also be presented and discussed. This complete analysis is used to demonstrate the capability of Yb:CaF2 multipass amplifier systems for operating the amplifier at 20 Hz with 57 mJ and 100 Hz with 32-mJ stable regime. Indeed, high repetition rate multipass amplifier has been realized for the first time with Yb:CaF2 and for this energy. The results have been analyzed precisely to take into account the thermal issues and excellent beam quality, with a M2 of 1.1. The pointing stability of 20 lrad has been measured documenting the reliability of the high repetition rate mJ amplifier.

show abstract

Section: Amplifier Setupmentioning

confidence: 99%

Diode-pumped Yb:CaF $$_2$$ 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

et al. 2014

View full text Add to dashboard Cite

show abstract

“…2. Since Yb:CaF 2 in general is a low gain medium [24], in order to increase a single pass gain 2-% doped 7-mm long Yb:CaF2 crystal in the amplifier is cryogenically cooled to 35 K temperature by a close loop cryorefrigerator (Cryomech PT90) having 48 W cooling capacity at 50 K temperature. At full pump load of 200 W the temperature of the crystal rises to 55 K. Yb:CaF2 crystal was aligned in such a way that the laser beam was propagating along [111] direction.…”

Section: Schematics Of the Multipass Amplifiermentioning

confidence: 99%

“…The disadvantage of this gain medium is relatively low absorption and emission cross-sections at room temperature (namely, 0.54·10 −20 cm 2 and 0.17·10 −20 cm 2 , correspondingly [23]). Application of cryogenic cooling helps increasing the emission and absorption cross/sections by a factor of 3 [23,24] while preserving sufficient gain bandwidth for amplification of 200-fs pulses. Moreover, cryogenic cooling transforms the room-temperature quasi 3-level system of Yb:CaF 2 into a 4-level system, which improves overall efficiency.…”

Section: Introductionmentioning

confidence: 99%

110-mJ 225-fs cryogenically cooled Yb:CaF_2 multipass amplifier

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract:We report on a diode-pumped cryogenically cooled bulk Yb:CaF 2 12-pass amplifier delivering 110-mJ, 1030-nm pulses at a 50-Hz repetition rate. The pulses have a spectral bandwidth of 13 nm and are compressed to 225 fs pulse duration in a double reflection grating based compressor having a transmission efficiency of >90%. The measured output beam quality is M 2 <1.1. A key feature of the amplifier design is the 4f relay imaging onto the gain medium with progressive beam magnification for the mitigation of the spatial gain narrowing effect. The number of passes in the amplifier is scalable by increasing the size of imaging mirrors. In order to prevent accumulation of nonlinear phase due to self-phase modulation in air, the amplifier is enclosed into a low-vacuum case. Baltuška, "Free-space nitrogen gas laser driven by a femtosecond filament," Phys. Rev. A 86(3), 033831 (2012). 22. A.

show abstract

“…Yb:CaF 2 has also been recently developed as a promising fs laser materials, due to a broad bandwidth that remains broad even at 80 K. At room temperature, a Yb:CaF 2 laser is reported with a pulsewidth of 99 fs [111]. A cryogenic laser using the closely related material Yb:CaNaF 2 laser has produced 173 fs pulses [170]. While we have not discussed a number of promising Yb based laser materials in this paper, choosing to concentrate here only on significant high average as well as peak power results at cryogenic temperatures, it is clear that Yb lasers are an active and vibrant research topic today, and that in the near future other newer laser materials will be used to advance the state-of-the-art.…”

Section: Cryogenic Ultrafast (Picosecond and Femtosecond) Lasersmentioning

confidence: 99%

The Application of Cryogenic Laser Physics to the Development of High Average Power Ultra-Short Pulse Lasers

Brown¹,

Tornegård²,

Kolis

et al. 2016

Applied Sciences

View full text Add to dashboard Cite

Ultrafast laser physics continues to advance at a rapid pace, driven primarily by the development of more powerful and sophisticated diode-pumping sources, the development of new laser materials, and new laser and amplification approaches such as optical parametric chirped-pulse amplification. The rapid development of high average power cryogenic laser sources seems likely to play a crucial role in realizing the long-sought goal of powerful ultrafast sources that offer concomitant high peak and average powers. In this paper, we review the optical, thermal, thermo-optic and laser parameters important to cryogenic laser technology, recently achieved laser and laser materials progress, the progression of cryogenic laser technology, discuss the importance of cryogenic laser technology in ultrafast laser science, and what advances are likely to be achieved in the near-future.

show abstract

Spectroscopy and lasing of cryogenically cooled Yb, Na:CaF2

Cited by 40 publications

References 33 publications

Diode-pumped Yb:CaF $$_2$$ 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

Diode-pumped Yb:CaF $$_2$$ 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

110-mJ 225-fs cryogenically cooled Yb:CaF_2 multipass amplifier

The Application of Cryogenic Laser Physics to the Development of High Average Power Ultra-Short Pulse Lasers

Contact Info

Product

Resources

About