Degree of compression and energy efficiency of a capillary compressor of femtosecond laser pulses

Capillary compressor of femtosecond laser pulses with nonlinear rotation of polarisation ellipse

“…The energy efficiency of such compressors reaches 50 % [1,2], and the degree of compression, i.e., the input-to-output ratio of the pulse durations may be as large as 15 [3,4].…”

Pulse propagation in hollow-core fiber at high-pressure regime: application to compression of tens of μJ pulses and determination of nonlinear refractive index of xenon at 103 μm

“…While the gain bandwidth of Yb-doped fiber is not as broad as Ti-Sapphire, Yb-doped glass offers the potential of high average power with tunable repetition rate up to megahertz while still delivered sufficient peak intensity for light-matter interaction of interest. Sub-picosecond pulses at repetition rate of hundreds of kilohertz and average power of hundreds of Watts have already been demonstrated [3][4][5][6][7][8]. Combining with spectral broadening via noble gasfilled HCF, the shortcoming of narrower bandwidth can be overcome.…”

“…Application of Yb-doped amplifier to EUV generation has also been recently demonstrated [9][10][11][12][13]. While spectral broadening and temporal compression of Yb-doped laser are easily achievable at hundreds of microjoules to millijoules level [4][5][6][7][8]13], spectral broadening in tens of microjoules and megahertz level is relatively harder to realize. Given that most commercially available Ybdoped laser are operated in this regime, an understanding in the temporal compression in this regime is highly beneficial for further application such as optical pump-probe spectroscopy, higher-order harmonic generation and high-power terahertz generation.…”

Note: 15-fs, 15-μJ green pulses from two-stage temporal compressor of ytterbium laser pulses

“…The capillary transmittance decreased at higher xenon pressure. 8 The spectrum of the output chirped pulse is presented in Fig. 2(a).…”

“…5 The compression ratio (ratio of the initial laser pulse duration to the compressed one) of such capillary compressors can reach 10-15 at energy efficiency of 30%-50%. [6][7][8] In our previous works we developed one more technique of femtosecond pulse compression. 9,10 It is based on spectral broadening of second harmonic pulse by second harmonic generation of phase modulated fundamental frequency pulse (chirped pulse) in a crystal.…”