Femtosecond laser based on Yb:KYW crystals with suppression of spectral narrowing in a regenerative amplifier by spectral profiling of the pulse

A Yb:KGW dual-crystal regenerative amplifier

“…A compact configuration was adopted, where the stretcher and the compressor shared one grating similar to that in Ref. [20]. Figure 6 shows the ray-tracing model of the stretcher and the compressor.…”

“…The Yb-ion has a long storage time, which is suitable for adopting a diode laser as a pump. Ytterbium-doped lasers have been developed to exhibit high pulse energy and power [13][14][15][16][17][18][19][20][21][22][23][24][25][26] .…”

“…Using Yb:KYW, a pulse energy up to 27 mJ at 100 Hz was realized with a pulse duration of 560 fs [ 19 ] . A pulse duration down to 182 fs was obtained with an output power of 8.7 W at 500 kHz [ 20 ] . Working at 1 kHz, 4.7 mJ pulses were obtained with a sub-picosecond pulse duration [ 21 ] .…”

Generation of 150-fs pulses from a diode-pumped Yb:KYW nonlinear regenerative amplifier

“…Research has been carried out to resolve this problem by enhancing the effective gain bandwidth with combination of gain media with separated gain maxima and overlapping broadband gain, allowing the generation of 180-fs-level pulses [8,9]. Another solution consists to use nonlinear effects [10,11] providing limited pulse duration to 250-500fs. In these configurations, the nonlinear effects strongly affect the temporal shape leading to large pedestals.…”

Numerical and Experimental Analysis of Nonlinear Regenerative Amplifiers Overcoming the Gain Bandwidth Limitation

“…To generate even shorter pulses, broader gain bandwidth media with very disordered matrices [9][10], or a combination of gain media [11][12][13] can be used. The latter can be done either in series, where the beam to be amplified propagates successively in gain media with slightly shifted gain bandwidth, or in parallel using recently demonstrated femtosecond spectral coherent combining architectures [14][15].…”