Disordered garnets Ca3(Nb, Ga)5O12:Nd3+- prospective crystals for powerful ultrashort-pulse generation (original) (raw)
Related papers
Journal of Alloys and Compounds, 2021
We report on the growth, structure refinement, optical spectroscopy, continuous wave and femtosecond mode-locked laser operation of a Tm 3þ ,Ho 3þ-codoped disordered calcium niobium gallium garnet (CNGG) crystal. The 2.64 at.% Tm, 0.55 at.% Ho:CNGG is grown by the Czochralski method. Its cubic structure, sp. gr. Ia3d-O 10 h , a ¼ 12.4952(1) Å, is refined by the Rietveld method revealing a random distribution of Ga 3þ and Nb 5þ cations over octahedral and tetrahedral sites. The Ho 3þ transition probabilities are determined within the Judd-Ofelt theory accounting for an intermediate configuration interaction (ICI). For the 5 I 7 / 5 I 8 Ho 3þ transition, the maximum stimulated-emission cross-section s SE is 0.47 Â 10 À20 cm 2 at 2080.7 nm. The gain bandwidth of Tm,Ho:CNGG at~2 mm is > 150 nm and the thermal equilibrium decay time-6.80 ms. The Tm 3þ 4 Ho 3þ energy transfer parameters are determined. A diode-pumped Tm,Ho:CNGG microchip laser generated 413 mW at 2088.4 nm with a slope efficiency of 15.9%. A continuous wavelength tuning between 1940.3 and 2144.6 nm is demonstrated. Ultrashort pulses as short as 73 fs are achieved at 2061 nm from a Tm,Ho:CNGG laser mode-locked by a GaSb semiconductor saturable absorber mirror at a repetition rate of 89.3 MHz.
Ultrashort pulse generation by Nd^3+:glass and Nd^3+:YAG lasers
Journal of The Optical Society of America, 1981
By injecting single subnanosecond pulses into a latent ring-laser oscillator, it is possible to generate highly reproducible intense trains of short pulses from a solid-state laser. In this way, 12-psec pulses are available from a highrepetition-rate Nd 3 +:YAG laser, whereas Nd 3 +:phosphate glass reliably produces pulses of <3-psec duration. Further compression of the Nd3+:YAG laser pulses can be accomplished by the insertion of a passive phase modulator into the cavity, yielding pulses of D5-psec duration and >3-cm-1 bandwidth. 0030-3941/81/050520-05$00.50
Picosecond pulses and applications
Applied Physics B Photophysics and Laser Chemistry, 1982
Generation of IR tunable subpicosecond pulses is stimulated by needs of high resolution time domain spectroscopy . It seems that parametric oscillators can be applied for the purpose especially in ir region [-3, 4]. In Kaiser's group [-3] even subpicosecond superluminescence optical parametric oscillator (OPO) has been developed. On the other hand synchronously pumped OPO with comparative parameters have been proposed [-4]. This paper concerns an investigation of pulse shortening phenomenon in synchronously pumped OPO. Our results of numerical simulation show that at the begining of pump depletion in OPO the signal pulse splitting occurs with drasticaldiscrimination of fragments following. This leads to the formation of an extremely short pulse. Pulse compression is limited by cavity and pump parameters. Our experimental set-up consists of picosecond high stable phosphate glass laser [5], second harmonic generator (SHG) and synchronously pumped OPO [-4] . Reflectivity of cavity mirrors was R1=90% in spectral region between 0.8 g and 1.07 and 15% for 2=0.53 ~ R2=4+80% at 1.061a. Crystal KDP l=4cm cut for 2nd phase matching type was placed inside OPO cavity. It was possible to change cavity length with accuracy better than 0.01 mm. Measured threshold pump intensity was
Subpicosecond mode locking of a Nd3+-doped garnet laser
Optics Letters, 1992
We demonstrate subpicosecond pulse generation using a GSAG:YSGG:Nd 3 + crystal. A dispersively balanced nonlinear Michelson interferometer has been used for self-starting mode locking to generate pulses of -0.5 ps with average output powers of as much as 190 mW.
Femtosecond pulses from the novel solid-state laser source Cr: LiSGaF
1997
ABSTRACT Efficient high-power TEM(00) cw laser operation of Cr:LiSGaF laser at Kr+-laser pumping is demonstrated. Results of spectroscopic and laser performance analysis, taking into account upconversion and excited-state absorption, are presented and used for the optimization of this laser yielding more than 900 mW output power. Different setups for Ken-lens mode locking, aiming at two goals simultaneously - high output power and short pulse duration - are analyzed and tested. The most simple KLM mode-locked Cr:LiSGaF laser could be realized, containing no intracavity prisms. This laser produced stable, near-transform-limited 44-fs pulses with an output power of 200 mW, tunable between 833 and 857 nn. Low-loss Gires-Tournois (GT) structured dielectric mirrors were used for dispersion control. The preference of such GT-type mirrors over chirped mirrors is discussed in detail. The shortest near-transform-limited pulses achieved so far in a GT-mirror dispersion-controlled resonator are 37 fs.
Ultrashort pulse generation in the mid-IR
Progress in Quantum Electronics, 2015
Recent developments in laser sources operating in the mid-IR (3-8 µm), have been motivated by the numerous possibilities for both fundamental and applied research. One example is the ability to unambiguously detect pollutants and carcinogens due to the much larger oscillator strengths of their absorption features in the mid-IR spectral region compared with the visible. Broadband sources are of particular interest for spectroscopic applications since they remove the need for arduous scanning or several lasers and allow simultaneous use of multiple absorption features thus increasing the confidence level of detection. In addition, sources capable of producing ultrashort and intense mid-IR radiation are gaining relevance in attoscience and strong-field physics due to wavelength scaling of re-collision based processes. In this paper we review the state-of-the-art in sources of coherent, pulsed mid-IR radiation. First we discuss semiconductor based sources which are compact and turnkey, but typically do not yield short pulse duration. Mid-IR laser gain material based approaches will be discussed, either for direct broadband mid-IR lasers or as narrowband pump lasers for parametric amplification in nonlinear crystals. The main part will focus on mid-IR generation and amplification based on parametric frequency conversion, enabling highest mid-IR peak power pulses. Lastly we close with an overview of nonlinear post-compression techniques, for decreasing pulse duration to the sub-2-optical-cycle regime.