Granted Patent B2

US 12,613,447 · App. 18/439,513 · Granted Apr 28, 2026

Inventors: Gugang Chen (Palo Alto, CA); Yi Rao (Logan, UT); Zhi-Chao Huang-Fu (Logan, UT)

Assignees: HONDA MOTOR CO., LTD.; UTAH STATE UNIVERSITY

G02F1/3534G02F1/392H01S3/1625H01S3/1636G02F2203/11

Abstract

Claims (48)

1 . A two-dimensional electronic sum frequency generation (2D-ESFG) apparatus, the apparatus comprising:

an amplifier comprising a laser source;

a broadband optical parametric amplifier (BOPA) optically coupled to the amplifier, the BOPA comprising a two-stage amplifier;

an etalon optically coupled to the amplifier, the etalon comprising two or more partially reflective substrate optical flats;

a noncollinear optical parametric amplifier (NOPA) optically coupled to the amplifier;

a dispersive filter pulse shaper optically coupled to the NOPA;

a synchronizer comprising a galvanometer mirror optically coupled to the BOPA, the etalon, and the dispersive filter pulse shaper; and

a detector optically coupled to the synchronizer.

2 . The apparatus of claim 1 , wherein the laser source comprises a titanium:sapphire laser.

3 . The apparatus of claim 1 , further comprising a first beam splitter and a second beam splitter.

4 . The apparatus of claim 3 , wherein the first beam splitter is optically coupled to the amplifier, the BOPA, and the second beam splitter.

5 . The apparatus of claim 3 , wherein the second beam splitter is optically coupled to the first beam splitter, the etalon, and the NOPA.

6 . The apparatus of claim 1 , wherein the galvanometer mirror comprises a single-axis galvanometer mirror.

7 . The apparatus of claim 1 , wherein the detector comprises a charge-coupled detector (CCD).

8 . A two-dimensional electronic sum frequency generation (2D-ESFG) apparatus, the apparatus comprising:

an amplifier comprising a laser source adapted to emit a laser light;

a noncollinear optical parametric amplifier (NOPA) adapted to shape the laser light emitted from the amplifier;

a dispersive filter pulse shaper adapted to generate a pulse pump pair from the laser light shaped by the NOPA;

a synchronizer comprising a galvanometer mirror adapted to reflect the pulse pump pair; and

a detector adapted to detect a wavelength of the pulse pump pair.

9 . The apparatus of claim 8 , wherein the laser source comprises a titanium:sapphire laser.

10 . The apparatus of claim 8 , further comprising a first beam splitter optically coupled to an amplifier.

11 . The apparatus of claim 10 , wherein the first beam splitter is further optically coupled to a second beam splitter.

12 . The apparatus of claim 11 , wherein the second beam splitter is further optically coupled to the NOPA.

13 . The apparatus of claim 8 , wherein the galvanometer mirror comprises a single-axis galvanometer mirror.

14 . The apparatus of claim 8 , wherein the detector comprises a charge-coupled detector (CCD).

15 . A method, the method comprising:

emitting a light from an amplifier to a first beam splitter, the first beam splitter configured to produce a first portion of light and a second portion of light;

producing a third portion of light and a fourth portion of light by directing the second portion of light to a second beam splitter;

directing the first portion of light to a broadband optical parametric amplifier (BOPA);

directing the third portion of light to an etalon comprising two or more partially reflective substrate optical flats;

directing the fourth portion of light to a noncollinear optical parametric amplifier (NOPA), wherein the fourth portion of light exits the NOPA and is directed to a dispersive filter pulse shaper;

producing an electronic sum frequency generation (ESFG) light by overlaying the first portion of light exiting the BOPA, the third portion of light exiting the etalon, and the fourth portion of light exiting the dispersive filter pulse shaper on a sample;

splitting the ESFG light using a synchronizer to form a first portion of ESFG light and a second portion of ESFG light; and

detecting the first portion of ESFG light and the second portion of ESFG light.

16 . The method of claim 15 , wherein the first portion of light comprises an ultra-broadband short wave infrared light (SWIR) comprising:

a wavelength of about 1200 nm to about 2400 nm;

pulse energy of about 200 μJ to about 300 μJ; and

a pulse duration of about 100 fs to about 300 fs.

17 . The method of claim 15 , wherein the third portion of light comprises:

a wavelength of about 700 nm to about 900 nm;

a pulse energy of about 1.7 mJ to about 1.9 mJ; and

a pulse duration of about 1 ps to about 1000 ps.

18 . The method of claim 15 , wherein the fourth portion of light comprises:

a wavelength of about 500 nm to about 540 nm; and

a pulse energy of about 5 μJ to about 10 μJ.

19 . The method of claim 15 , further comprising splitting the ESFG light by rotating the synchronizer at a scan angle of about −1.5° to about 1.5°.

20 . The method of claim 15 , further comprising splitting the ESFG light by oscillating the synchronizer at a frequency of about 400 Hz to about 600 Hz.

Assignments (2)

Continuity (1)

References Cited (118)