Method for manufacturing optical device, method for manufacturing laser device, method for adjusting beam quality of laser device
An optical device 30 has a GRIN lens 35 , a preceding-stage optical fiber 31 from which a light beam is entered to the GRIN lens 35 , and a subsequent-stage optical fiber 32 to which a light beam emitted from the GRIN lens 35 is entered. A method for adjusting beam quality includes a measurement process P 2 in which a light beam is entered to the preceding-stage optical fiber 31 and the beam quality of a light beam to be emitted from the subsequent-stage optical fiber 32 through the GRIN lens 35 is measured, and an adjustment process P 3 in which the length of the GRIN lens 35 is adjusted on the basis of a result in the measurement process P 2.
1. A method for manufacturing an optical device having a GRIN lens, a preceding-stage optical fiber from which a light beam is entered to the GRIN lens, and a subsequent-stage optical fiber to which a light beam emitted from the GRIN lens is entered, the method comprising:
a measurement process in which a light beam is entered to the preceding-stage optical fiber and beam quality of a light beam to be emitted from the subsequent-stage optical fiber through the GRIN lens is measured; and
an adjustment process in which a length of the GRIN lens is adjusted on the basis of a result in the measurement process,
wherein the preceding-stage optical fiber is a multimode fiber.
2. The method for manufacturing an optical device according to claim 1 , wherein
a diameter of a core of the subsequent-stage optical fiber is greater than a diameter of a light beam to be emitted from the GRIN lens.
3. The method for manufacturing an optical device according to claim 1 , wherein
the adjustment process is performed by cutting the GRIN lens in a longitudinal direction.
4. The method for manufacturing an optical device according to claim 1 , wherein
the adjustment process is performed by replacing the GRIN lens with another GRIN lens having a different length.
5. The method for manufacturing an optical device according to claim 1 , wherein
a length of the GRIN lens is less than a half pitch.
6. The method for manufacturing an optical device according to claim 5 , wherein
a length of the GRIN lens is a quarter pitch or more.
7. A method for manufacturing a laser device including
an optical device having a GRIN lens, a preceding-stage optical fiber from which a light beam is entered to the GRIN lens, and a subsequent-stage optical fiber to which a light beam emitted from the GRIN lens is entered, and
a light source configured to emit a light beam to be entered to the preceding-stage optical fiber, the method comprising:
a measurement process in which a light beam is entered from the light source to the preceding-stage optical fiber and beam quality of a light beam to be emitted from the subsequent-stage optical fiber through the GRIN lens is measured; and
an adjustment process in which a length of the GRIN lens is adjusted on the basis of a result in the measurement process,
wherein the preceding-stage optical fiber is a multimode fiber.
8. The method for manufacturing a laser device according to claim 7 , wherein
a diameter of a core of the subsequent-stage optical fiber is greater than a diameter of a light beam to be emitted from the GRIN lens.
9. The method for manufacturing a laser device according to claim 7 , wherein
the adjustment process is performed by cutting the GRIN lens in a longitudinal direction.
10. The method for manufacturing a laser device according to claim 7 , wherein
the adjustment process is performed by replacing the GRIN lens with another GRIN lens having a different length.
11. The method for manufacturing a laser device according to claim 7 , wherein
a length of the GRIN lens is less than a half pitch.
12. The method for manufacturing a laser device according to claim 11 , wherein
a length of the GRIN lens is a quarter pitch or more.
13. A method for adjusting beam quality of a laser device including
an optical device having a GRIN lens, a preceding-stage optical fiber from which a light beam is entered to the GRIN lens, and a subsequent-stage optical fiber to which a light beam emitted from the GRIN lens is entered, and
a light source configured to emit a light beam to be entered to the preceding-stage optical fiber, the method comprising:
a measurement process in which a light beam is entered from the light source to the preceding-stage optical fiber and beam quality of a light beam to be emitted from the subsequent-stage optical fiber through the GRIN lens is measured; and
an adjustment process in which a length of the GRIN lens is adjusted on the basis of a result in the measurement process,
wherein the preceding-stage optical fiber is a multimode fiber.