US 9,812,837 B2
Ultrashort pulse fiber amplifier with rare-earth doped gain fibers
Shibin Jiang, Tucson, AZ (US); Tao Luo, Tucson, AZ (US); Qing Wang, Tucson, AZ (US); and Lei Pan, Tucson, AZ (US)
Assigned to ADVALUE PHOTONICS, INC., Tucson, AZ (US)
Filed by AdValue Photonics, Inc., Tucson, AZ (US)
Filed on May 22, 2017, as Appl. No. 15/601,748.
Application 15/601,748 is a continuation in part of application No. 14/802,861, filed on Jul. 17, 2015.
Application 14/802,861 is a continuation in part of application No. 14/605,740, filed on Jan. 26, 2015, granted, now 9,581,760, issued on Feb. 28, 2017.
Prior Publication US 2017/0264067 A1, Sep. 14, 2017
Int. Cl. G02B 6/036 (2006.01); H01S 3/067 (2006.01); H01S 3/16 (2006.01); H01S 3/094 (2006.01)
CPC H01S 3/06729 (2013.01) [H01S 3/06712 (2013.01); H01S 3/06716 (2013.01); H01S 3/1618 (2013.01); H01S 3/094003 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A 1.01 to 1.12 micron wavelength ultrashort pulse fiber amplifier with pulse width from 200 ps to 200 fs, comprising: an Ytterbium doped multicomponent glass gain fiber for laser amplification from 1.01 to 1.12 micron wavelength, comprising:
a core; and
a cladding;
wherein said core comprises:
at least 2 weight percent glass network modifier selected from BaO, CaO, MgO, ZnO, PbO, K2O, Na2O, Li2O, Y2O3, and combinations thereof; and
ytterbium oxide at a level from about 3 to about 50 weight percent;
wherein:
a mode of the core is guided with step index difference between the core and the cladding;
a numerical aperture of the gain fiber is between 0.01 and 0.04;
a core diameter is from 60 microns to 150 microns;
a length of the gain fiber is shorter than 60 cm,
wherein said fiber amplifier comprises no pulse stretching devices and no pulse compressing devices.