A laser system having a multi-pass amplifier system, comprising; at least one seed source configured to output at least one seed signal having a seed signal wavelength; at least one pump source configured to provide at least one pump signal having at least one pump signal wavelength; at least one first amplifier stage configured to amplify the at least one seed signal to generate at least one amplified seed signal in response thereto: at least one multi-pass second amplifier stage configured to receive the at least one amplified seed signal; at least one gain media device positioned within the at least one multi-pass second amplifier stage, the gain media device having at least one elongated facet and at least one compact facet, the at least one gain media device pumped by the at least one pump signal and configured to receive the at least one amplified seed signal and output at least one amplifier output signal having an output wavelength range; a first mirror and at least a second mirror positioned within the at least one multi-pass second amplifier stage wherein the at least one gain media device is positioned between and separate from the first mirror and at least the second mirror, at least one of the first mirror and at least one second mirror having areas of high reflectivity at the output wavelength range and areas of high transmission at wavelengths outside the output wavelength range; wherein the first mirror and the second mirror are configured to receive the amplified seed signal and repeatedly direct the seed signal into the gain media device for multi-pass amplification thereby outputting an amplified output signal and transmit pump signals for pumping of the gain media; wherein the areas of high transmission formed on at least one of the first mirror and the at least one second mirror are configured to transmit at least one of the at least one pump signal, at least one unabsorbed seed signal, and at least one parasitic signal generated during the amplification process: at least one optical system in communication with the at least one multi-pass amplifier system and configured to receive the at least one amplifier output signal and output at least one output signal within the output wavelength range. at least one seed source configured to output at least one seed signal having a seed signal wavelength; at least one pump source configured to provide at least one pump signal having at least one pump signal wavelength; at least one first amplifier stage configured to amplify the at least one seed signal to generate at least one amplified seed signal in response thereto: at least one multi-pass second amplifier stage configured to receive the at least one amplified seed signal; at least one gain media device positioned within the at least one multi-pass second amplifier stage, the gain media device having at least one elongated facet and at least one compact facet, the at least one gain media device pumped by the at least one pump signal and configured to receive the at least one amplified seed signal and output at least one amplifier output signal having an output wavelength range; a first mirror and at least a second mirror positioned within the at least one multi-pass second amplifier stage wherein the at least one gain media device is positioned between and separate from the first mirror and at least the second mirror, at least one of the first mirror and at least one second mirror having areas of high reflectivity at the output wavelength range and areas of high transmission at wavelengths outside the output wavelength range; wherein the first mirror and the second mirror are configured to receive the amplified seed signal and repeatedly direct the seed signal into the gain media device for multi-pass amplification thereby outputting an amplified output signal and transmit pump signals for pumping of the gain media; wherein the areas of high transmission formed on at least one of the first mirror and the at least one second mirror are configured to transmit at least one of the at least one pump signal, at least one unabsorbed seed signal, and at least one parasitic signal generated during the amplification process: at least one optical system in communication with the at least one multi-pass amplifier system and configured to receive the at least one amplifier output signal and output at least one output signal within the output wavelength range.