<p>An apparatus for drilling underground having at least one optical fiber for transmitting light energy from a laser energy source disposed above ground to an underground drilling location and a mechanical drill bit having at least one cutting surface and forming at least one light transmission channel aligned to transmit light from the at least one optical fiber through the mechanical drill bit by way of the at least one light transmission channel.</p>
申请公布号
WO2010036318(A1)
申请公布日期
2010.04.01
申请号
WO2009US05200
申请日期
2009.09.18
申请人
GAS TECHNOLOGY INSTITUTE;PERRY, KENT;SALEHI, IRAJ;ABBASI, HAMID, A.