diff --git a/src/arpes/utilities/conversion/base.py b/src/arpes/utilities/conversion/base.py
index 706775ab..07605342 100644
--- a/src/arpes/utilities/conversion/base.py
+++ b/src/arpes/utilities/conversion/base.py
@@ -14,7 +14,7 @@
     from _typeshed import Incomplete
     from numpy.typing import NDArray
 
-    from arpes._typing import MOMENTUM
+    from arpes._typing import MOMENTUM, KspaceCoords
 
     from .calibration import DetectorCalibration
 
@@ -150,7 +150,7 @@ def get_coordinates(
         self,
         resolution: dict[MOMENTUM, float] | None = None,
         bounds: dict[MOMENTUM, tuple[float, float]] | None = None,
-    ) -> dict[str, NDArray[np.float_]]:
+    ) -> KspaceCoords:
         """Calculates the coordinates which should be used in momentum space.
 
         Args:
@@ -159,12 +159,10 @@ def get_coordinates(
             bounds(dict, optional): bounds of the momentum coordinates
 
         Returns:
-            dict[str, NDArray]: the key represents the axis name suchas "kp", "kx", and "eV".
+            KspaceCoords: the key represents the axis name suchas "kp", "kx", and "eV".
         """
-        if resolution is None:
-            resolution = {}
-        if bounds is None:
-            bounds = {}
-        coordinates: dict[str, NDArray[np.float_]] = {}
+        resolution = resolution if resolution is not None else {}
+        bounds = bounds if bounds is not None else {}
+        coordinates: KspaceCoords = {}
         coordinates["eV"] = self.arr.coords["eV"].values
         return coordinates
diff --git a/src/arpes/utilities/conversion/core.py b/src/arpes/utilities/conversion/core.py
index ac96bd32..830463e3 100644
--- a/src/arpes/utilities/conversion/core.py
+++ b/src/arpes/utilities/conversion/core.py
@@ -28,7 +28,7 @@
 from collections.abc import Hashable
 from itertools import pairwise
 from logging import DEBUG, INFO, Formatter, StreamHandler, getLogger
-from typing import TYPE_CHECKING, Literal, TypedDict
+from typing import TYPE_CHECKING, Literal, TypedDict, Unpack
 
 import numpy as np
 import xarray as xr
@@ -52,7 +52,7 @@
 
     from numpy.typing import NDArray
 
-    from arpes._typing import MOMENTUM, XrTypes
+    from arpes._typing import MOMENTUM, KspaceCoords, XrTypes
     from arpes.utilities.conversion.calibration import DetectorCalibration
 
 __all__ = ["convert_to_kspace", "slice_along_path"]
@@ -284,9 +284,9 @@ def convert_to_kspace(  # noqa: PLR0913
     bounds: dict[MOMENTUM, tuple[float, float]] | None = None,
     resolution: dict[MOMENTUM, float] | None = None,
     calibration: DetectorCalibration | None = None,
-    coords: dict[MOMENTUM, NDArray[np.float_]] | None = None,
+    coords: KspaceCoords | None = None,
     allow_chunks: bool = False,
-    **kwargs: NDArray[np.float_],
+    **kwargs: Unpack[KspaceCoords],
 ) -> xr.DataArray:
     """Converts volumetric the data to momentum space ("backwards"). Typically what you want.
 
@@ -342,7 +342,7 @@ def convert_to_kspace(  # noqa: PLR0913
         xr.DataArray: [description]
     """
     coords = coords if coords else {}
-    coords.update(**kwargs)
+    coords.update(kwargs)
     assert isinstance(coords, dict)
     bounds = bounds if bounds else {}
     arr = arr if isinstance(arr, xr.DataArray) else normalize_to_spectrum(arr)
@@ -434,7 +434,7 @@ class CoordinateTransform(TypedDict, total=True):
 
 def convert_coordinates(
     arr: xr.DataArray,
-    target_coordinates: dict[str, NDArray[np.float_]],
+    target_coordinates: KspaceCoords,
     coordinate_transform: CoordinateTransform,
     *,
     as_dataset: bool = False,
@@ -558,8 +558,8 @@ def _chunk_convert(
     bounds: dict[MOMENTUM, tuple[float, float]] | None = None,
     resolution: dict[MOMENTUM, float] | None = None,
     calibration: DetectorCalibration | None = None,
-    coords: dict[MOMENTUM, NDArray[np.float_]] | None = None,
-    **kwargs: NDArray[np.float_],
+    coords: KspaceCoords | None = None,
+    **kwargs: Unpack[KspaceCoords],
 ) -> xr.DataArray:
     DESIRED_CHUNK_SIZE = 1000 * 1000 * 20
     TOO_LARGE_CHUNK_SIZE = 100
diff --git a/src/arpes/utilities/conversion/forward.py b/src/arpes/utilities/conversion/forward.py
index 5ad06c41..c7a83bac 100644
--- a/src/arpes/utilities/conversion/forward.py
+++ b/src/arpes/utilities/conversion/forward.py
@@ -14,7 +14,7 @@
 
 import warnings
 from logging import DEBUG, INFO, Formatter, StreamHandler, getLogger
-from typing import TYPE_CHECKING, Hashable, TypeVar, Unpack
+from typing import TYPE_CHECKING, TypeVar, Unpack
 
 import numpy as np
 import xarray as xr
diff --git a/src/arpes/utilities/conversion/kx_ky_conversion.py b/src/arpes/utilities/conversion/kx_ky_conversion.py
index 209bf169..565c6e94 100644
--- a/src/arpes/utilities/conversion/kx_ky_conversion.py
+++ b/src/arpes/utilities/conversion/kx_ky_conversion.py
@@ -25,7 +25,7 @@
     from _typeshed import Incomplete
     from numpy.typing import NDArray
 
-    from arpes._typing import MOMENTUM
+    from arpes._typing import MOMENTUM, KspaceCoords
 
 __all__ = ["ConvertKp", "ConvertKxKy"]
 
@@ -150,7 +150,7 @@ def get_coordinates(
         self,
         resolution: dict[MOMENTUM, float] | None = None,
         bounds: dict[MOMENTUM, tuple[float, float]] | None = None,
-    ) -> dict[str, NDArray[np.float_]]:
+    ) -> KspaceCoords:
         """Calculates appropriate coordinate bounds.
 
         Args:
@@ -309,12 +309,10 @@ def get_coordinates(
         self,
         resolution: dict[MOMENTUM, float] | None = None,
         bounds: dict[MOMENTUM, tuple[float, float]] | None = None,
-    ) -> dict[str, NDArray[np.float_]]:
+    ) -> KspaceCoords:
         """Calculates appropriate coordinate bounds."""
-        if resolution is None:
-            resolution = {}
-        if bounds is None:
-            bounds = {}
+        resolution = resolution if resolution is not None else {}
+        bounds = bounds if bounds is not None else {}
         coordinates = super().get_coordinates(resolution, bounds=bounds)
         ((kx_low, kx_high), (ky_low, ky_high)) = calculate_kx_ky_bounds(self.arr)
         if "kx" in bounds:
@@ -353,8 +351,8 @@ def get_coordinates(
             ky_high + K_SPACE_BORDER,
             resolution.get("ky", inferred_ky_res),
         )
-        base_coords = {
-            str(k): v  # should v.values?
+        base_coords: KspaceCoords = {
+            str(k): v  # should v.values?base
             for k, v in self.arr.coords.items()
             if k not in ["eV", "phi", "psi", "theta", "beta", "alpha", "chi"]
         }
diff --git a/src/arpes/utilities/conversion/kz_conversion.py b/src/arpes/utilities/conversion/kz_conversion.py
index c41f4af4..a34d6320 100644
--- a/src/arpes/utilities/conversion/kz_conversion.py
+++ b/src/arpes/utilities/conversion/kz_conversion.py
@@ -20,7 +20,7 @@
     from _typeshed import Incomplete
     from numpy.typing import NDArray
 
-    from arpes._typing import MOMENTUM
+    from arpes._typing import MOMENTUM, KspaceCoords
 
 __all__ = ["ConvertKpKzV0", "ConvertKxKyKz", "ConvertKpKz"]
 
@@ -90,10 +90,8 @@ def get_coordinates(
         bounds: dict[MOMENTUM, tuple[float, float]] | None = None,
     ) -> dict[str, NDArray[np.float_]]:
         """Calculates appropriate coordinate bounds."""
-        if resolution is None:
-            resolution = {}
-        if bounds is None:
-            bounds = {}
+        resolution = resolution if resolution is not None else {}
+        bounds = bounds if bounds is not None else {}
         coordinates = super().get_coordinates(resolution=resolution, bounds=bounds)
         ((kp_low, kp_high), (kz_low, kz_high)) = calculate_kp_kz_bounds(self.arr)
         if "kp" in bounds: