公开(公告)号：US11749962B2

公开(公告)日：2023-09-05

申请号：US17147691

申请日：2021-01-13

Applicant: EXCELITAS TECHNOLOGIES CORP.

Inventor： Bartley C. Johnson ,  Walid A. Atia ,  Peter S. Whitney ,  Mark E. Kuznetsov ,  Edward J. Mallon

IPC: H01S5/04 ,  H01S5/183 ,  H01S5/50 ,  H01S5/22 ,  H01S5/30 ,  H01S5/343 ,  H01S5/02251 ,  H01S5/02345

CPC classification number: H01S5/041 ,  H01S5/18361 ,  H01S5/18366 ,  H01S5/5045 ,  H01S5/02251 ,  H01S5/02345 ,  H01S5/22 ,  H01S5/3013 ,  H01S5/343

Abstract: An optically pumped tunable VCSEL swept source module has a VCSEL and a pump, which produces light to pump the VSCEL, wherein the pump is geometrically isolated from the VCSEL. In different embodiments, the pump is geometrically isolated by defocusing light from the pump in front of the VCSEL, behind the VCSEL, and/or by coupling the light from the pump at an angle with respect to the VCSEL. In the last case, angle is usually less than 88 degrees. There are further strategies for attacking pump noise problems. Pump feedback can be reduced through (1) Faraday isolation and (2) geometric isolation. Single frequency pump lasers (Distributed feedback lasers (DFB), distributed Bragg reflector lasers (DBR), Fabry-Perot (FP) lasers, discrete mode lasers, volume Bragg grating (VBG) stabilized lasers can eliminate wavelength jitter and amplitude noise that accompanies mode hopping.

公开(公告)号：US20210175683A1

公开(公告)日：2021-06-10

申请号：US17147691

申请日：2021-01-13

Applicant: EXCELITAS TECHNOLOGIES CORP.

Inventor： Bartley C. Johnson ,  Walid A. Atia ,  Peter S. Whitney ,  Mark E. Kuznetsov ,  Edward J. Mallon

IPC: H01S5/04 ,  H01S5/183 ,  H01S5/50

Abstract: An optically pumped tunable VCSEL swept source module has a VCSEL and a pump, which produces light to pump the VSCEL, wherein the pump is geometrically isolated from the VCSEL. In different embodiments, the pump is geometrically isolated by defocusing light from the pump in front of the VCSEL, behind the VCSEL, and/or by coupling the light from the pump at an angle with respect to the VCSEL. In the last case, angle is usually less than 88 degrees. There are further strategies for attacking pump noise problems. Pump feedback can be reduced through (1) Faraday isolation and (2) geometric isolation. Single frequency pump lasers (Distributed feedback lasers (DFB), distributed Bragg reflector lasers (DBR), Fabry-Perot (FP) lasers, discrete mode lasers, volume Bragg grating (VBG) stabilized lasers can eliminate wavelength jitter and amplitude noise that accompanies mode hopping.