Temporal Pump Research Articles

80 kHz repetition rate high power fiber amplifier flat-top pulse pumped OPCPA based on BIB_3O_6

We present a high peak power optical parametric chirped pulse amplifier (OPCPA) seeded by a cavity dumped Ti:Sapphire oscillator. A frequency doubled high power Ytterbium-doped fiber amplifier is pumping the device. Temporal synchronization of the pump pulses is done via soliton generation in a highly nonlinear photonic crystal fiber. This soliton is fiber amplified and spectrally filtered in several fiber amplifiers. A simple birefringent pulse shaper generates a flat-top temporal pump pulse profile. Direct amplification of these pulses in large mode area fibers without using a stretcher and compressor provides significantly reduced complexity. For the first time to our knowledge broadband amplification around 800 nm central wavelength is demonstrated in BIB(3)O(6) (BIBO) crystals. The stretched Ti:Sapphire oscillator pulses are amplified up to a pulse energy of 25 microJ. Recompression with a grating compressor yields 50.7 fs pulses with 16.2 microJ pulse energy.

Propagation characteristics of fast light in an erbium-doped fiber amplifier

A perturbation method is used to study the interactions among the signal power, pump power, and metastable population density for fast light in an erbium-doped fiber amplifier. The impact of temporal pump depletion (TPD) on fast light is investigated in which TPD is the response of the pump power to the temporal variation of the metastable population density. It is found that the gain coefficient and the absolute value of the negative group velocity are overestimated without considering the TPD. The effects of high-order dispersions on fast light are also shown.

Threshold conditions for 800 nm pumping of 2 ?m Tm : Ho lasers

Pumping requirements of pulsed and continuous wave (CW) 2 μm Tm : Ho lasers are investigated experimentally and theoretically for excitation at 800 nm. The influence of the pulse duration on threshold is measured using a chopped Ti : Al2O3 laser. Based on the experimental and simulated results the spatial and temporal pump requirements in future quasi-CW high-power diode-pumped 2 μm Tm : Ho lasers are determined. The experiments and the model allow the evaluation of different loss mechanisms and indicate significant 540 nm emitting loss mechanisms.

Theory of temporal pump stochasticity in stimulated Raman scattering in dispersionless media

A diagrammatic formalism is presented which gives exact results for the forward Stokes wave in dispersionless media in the field of a temporally stochastic pump. Both pump and Stokes waves are assumed to be plane waves, but transient effects are treated exactly. Results are derived in the Bourret approximation for the n-point functions (n≳2) but are exact to all orders in the mean pump field and its two-point function. The generalization to treat general n-point functions within this formalism is possible and the method of doing so is indicated. The partial summation of diagrams corresponding to previous treatments is identified and the next order terms are evaluated. It is found that for high gain systems, approximations made in previous work may be quite poor.